Journal articles: 'Microstrip antennas Resonators'

1

Ahmed, Sadiq, and Madhukar Chandra. "Design of a dual linear polarization antenna using split ring resonators at X-band." Advances in Radio Science 15 (November 6, 2017): 259–67. http://dx.doi.org/10.5194/ars-15-259-2017.

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Abstract. Dual linear polarization microstrip antenna configurations are very suitable for high-performance satellites, wireless communication and radar applications. This paper presents a new method to improve the co-cross polarization discrimination (XPD) for dual linear polarized microstrip antennas at 10 GHz. For this, three various configurations of a dual linear polarization antenna utilizing metamaterial unit cells are shown. In the first layout, the microstrip patch antenna is loaded with two pairs of spiral ring resonators, in the second model, a split ring resonator is placed between two microstrip feed lines, and in the third design, a complementary split ring resonators are etched in the ground plane. This work has two primary goals: the first is related to the addition of metamaterial unit cells to the antenna structure which permits compensation for an asymmetric current distribution flow on the microstrip antenna and thus yields a symmetrical current distribution on it. This compensation leads to an important enhancement in the XPD in comparison to a conventional dual linear polarized microstrip patch antenna. The simulation reveals an improvement of 7.9, 8.8, and 4 dB in the E and H planes for the three designs, respectively, in the XPD as compared to the conventional dual linear polarized patch antenna. The second objective of this paper is to present the characteristics and performances of the designs of the spiral ring resonator (S-RR), split ring resonator (SRR), and complementary split ring resonator (CSRR) metamaterial unit cells. The simulations are evaluated using the commercial full-wave simulator, Ansoft High-Frequency Structure Simulator (HFSS).

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Frezza, Fabrizio, Lara Pajewski, Emanuele Piuzzi, Cristina Ponti, and Giuseppe Schettini. "Radiation-Enhancement Properties of an X-Band Woodpile EBG and Its Application to a Planar Antenna." International Journal of Antennas and Propagation 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/729187.

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A woodpile Electromagnetic Bandgap (EBG) material has been designed, by using an in-house code that implements the Fourier Modal Method (FMM). A couple of alumina-woodpile samples have been fabricated. Several results have been collected for the transmission behaviour of the woodpile and of resonators with woodpile mirrors, in a shielded anechoic chamber, by using a vector network analyzer, in the 8–12 GHz range. These new experimental data highlight interesting properties of 3D EBG resonators and suggest possible innovative applications. Comparisons of the collected results with FMM show a satisfactory agreement. An application of the EBG resonator has been considered, for gain enhancement of a microstrip antenna: an increase of about 10 dB in the broadside gain has been measured; experimental data and numerical results obtained with the commercial software HFSS show a good agreement. A comparison is presented between EBG resonator antennas and two-dimensional uniform arrays. Finally, HFSS results are provided for EBG resonator antennas working at higher frequencies or with a more selective superstrate: a gain enhancement of more than 18 dB is achieved by such antennas.

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Corchia, Laura, Giuseppina Monti, and Luciano Tarricone. "A Frequency Signature RFID Chipless Tag for Wearable Applications." Sensors 19, no. 3 (January 25, 2019): 494. http://dx.doi.org/10.3390/s19030494.

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In this paper, a frequency-signature Radio-Frequency Identification (RFID) chipless tag for wearable applications is presented. The results achieved for a fully-textile solution guaranteeing a seamless integration in clothes are reported and discussed. The proposed tag consists of two planar monopole antennas and a 50 Ω microstrip line loaded with multiple resonators. In order to achieve a compact size, the resonators are slotted on the ground plane of the microstrip line. As for the antennas, the same geometry was exploited for both the TX and the RX tag antenna. In particular, it consists of a proximity fed planar monopole on a ground plane. The selected geometry guarantees easy integration with the multi-resonator structure. Numerical and experimental data referring to a 2-bit implementation are presented and discussed. For fabricating all the prototypes, a layer of pile was used as a substrate, while an adhesive non-woven conductive fabric was exploited for the fabrication of the conductive parts. Experimental tests demonstrate that although the performance of the final device strongly depends on the properties of the used materials and on the imperfections of the fabrication process, the proposed frequency-signature RFID chipless tag is suitable for wearable applications, such as anti-counterfeiting systems and laundry labels.

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Deng, Chao. "Wideband Microstrip Antennas Loaded by Ring Resonators." IEEE Antennas and Wireless Propagation Letters 12 (2013): 1665–68. http://dx.doi.org/10.1109/lawp.2013.2294921.

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Saraereh, Omar, Imran Khan, Byung Lee, and A. K. S. Al-Bayati. "Modeling and Analysis of Wearable Antennas." Electronics 8, no. 1 (December 21, 2018): 7. http://dx.doi.org/10.3390/electronics8010007.

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This paper describes a sheet-like transmission line for constructing a short-range wireless communication system using flexible materials such as clothing. As a new application of wireless communications, it is desired to construct a Personal Area Network (PAN) and a sensor network with a short distance communication area of about 1 m to 2 m. For such applications, a waveguide of a new structure is required which can exchange information at an arbitrary place on the waveguide, which has a flexible structure and limits the area for wireless communication. Therefore, by disposing the microstrip type resonators two-dimensionally with a two-layer structure and electromagnetically strongly coupling the resonators, the electromagnetic waves are confined well within the transmission line, and the antenna of the wireless device resonator is arranged. Furthermore, by constructing this transmission line with a sheet-like flexible wearable material, the transmission of both information and power can be performed through a thin flexible transmission line for the wearable network.

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Chi, Yu-Jen, and Fu-Chiarng Chen. "A novel quadri-polarization-agile microstrip antenna with polarization synthesizing feeding network." International Journal of Microwave and Wireless Technologies 8, no. 2 (March 26, 2015): 385–94. http://dx.doi.org/10.1017/s1759078715000227.

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This paper proposes planar antennas with quadri-polarization diversity using a pair of orthogonal linear polarizations and a pair of orthogonal circular polarizations (CP). A novel feeding network with four input ports and four output ports is presented, allowing antenna polarization diversity by selecting different input ports, which can generate right-handed CP, left-handed CP, horizontal linear polarization, and vertical linear polarization. The first design uses two square patch resonators to synthesize the four polarizations; the second design comprises four circularly polarized patches to synthesize the four polarizations with an improved axial-ratio (the ratio of orthogonal components of an E-field) bandwidth. The proposed designs do not require for embedding PIN diodes and DC-biasing circuits, making them suitable for use in higher-frequency applications where using lump elements would be difficult. The novel antennas provide potential polarization diversity features which can be used for many applications. Details of the antenna design are shown, and the measurement and simulation results are also provided to validate the proposed concept.

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Bie, Shuhang, and Shi Pu. "Array Design of 300 GHz Dual-Band Microstrip Antenna Based on Dual-Surfaced Multiple Split-Ring Resonators." Sensors 21, no. 14 (July 19, 2021): 4912. http://dx.doi.org/10.3390/s21144912.

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To meet the increasing need of high-data-rate and broadband wireless communication systems, the devices and its circuits R&D under Millimeter, Sub-Millimeter, or even Terahertz (THz) frequency bands are attracting more and more attention from not only academic, but also industrial areas. Most of the former research on the THz waveband (0.1–10 THz) antenna design is mainly focused on realizing high directional gain, such as horn antennas, even though the coverage area is very limited when comparing with the current Wi-Fi system. One solution for the horizontally omnidirectional communication antenna is using the structure of multiple split-ring resonators (MSRRs). Aiming at this point, a novel 300 GHz microstrip antenna array based on the dual-surfaced multiple split-ring resonators (DSMSRRs) is proposed in this paper. By employing the two parallel microstrip transmission lines, different MSRRs are fed and connected on two surfaces of the PCB with a centrally symmetric way about them. The feeding port of the whole antenna is in between the centers of the two microstrip lines. Thus, this kind of structure is a so-called DSMSRR. Based on the different size of the MSRRs, different or multiple working wavebands can be achieved on the whole antenna. Firstly, in this paper, the quasi-static model is used to analyze the factors affecting the resonance frequency of MSRRs. Simulation and measured results demonstrate that the resonant frequency of the proposed array antenna is 300 GHz, which meets the design requirements of the expected frequency point and exhibits good radiation characteristics. Then, a dual-band antenna is designed on the above methods, and it is proved by simulation that the working frequency bands of the proposed dual-band antenna with reflection coefficient below −10 dB are 274.1–295.6 GHz and 306.3–313.4 GHz.

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CHOI, Junho, Seongmin PYO, Sang-Min HAN, and Young-Sik KIM. "Compact Circularly Polarized Microstrip Antennas Using EM Coupled Loop Resonators." IEICE Transactions on Communications E93-B, no. 10 (2010): 2658–61. http://dx.doi.org/10.1587/transcom.e93.b.2658.

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Malekabadi, S. A., A. R. Attari, and M. M. Mirsalehi. "Design of Compact Broadband Microstrip Antennas Using Coplanar Coupled Resonators." Journal of Electromagnetic Waves and Applications 23, no. 13 (January 1, 2009): 1755–62. http://dx.doi.org/10.1163/156939309789566888.

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10

Croq, F., and D. M. Pozar. "Multifrequency operation of microstrip antennas using aperture-coupled parallel resonators." IEEE Transactions on Antennas and Propagation 40, no. 11 (1992): 1367–74. http://dx.doi.org/10.1109/8.202714.

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11

Abdulkawi, Wazie M., and Abdel-Fattah A. Sheta. "Four-State Coupled-Line Resonator for Chipless RFID Tags Application." Electronics 8, no. 5 (May 25, 2019): 581. http://dx.doi.org/10.3390/electronics8050581.

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A novel quad-state coupled-line microstrip resonator is proposed for compact chipless radio frequency identification (RFID) tags. The proposed resonator can be reconfigured to present one of four possible states: 00, 01, 10, and 11, representing, no resonance, resonance at f2, resonance at f1, and resonance at both f1 and f2, respectively. The frequency span between f2 and f1 can be easily controlled, thereby reducing the required spectrum. Moreover, the proposed technique allows the storage of a large amount of data in a compact size to reduce the cost per bit. A multi-resonator prototype consisting of six resonators is designed, analyzed, and experimentally characterized. This prototype is implemented on the RT Duroid 5880 substrate with a dielectric constant of 2.2, loss tangent of 0.0009, and thickness of 0.79 mm. The designed configuration can be reconfigured for 46 codes. Two complete the RFID tags, including the six resonators and two orthogonally polarized transmitting and receiving antennas, are implemented and tested. The first tag code is designed for all ones, 111111111111, and the second tag is designed as 101010101010 code. Experimental results show good agreement with the simulation.

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Alsultan, Raghad Ghalib Saadallah, and Gölge Ögücü Yetkin. "Mutual Coupling Reduction of E-Shaped MIMO Antenna with Matrix of C-Shaped Resonators." International Journal of Antennas and Propagation 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/4814176.

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E-shaped multiple-input-multiple-output (MIMO) microstrip antenna systems operating in WLAN and WiMAX bands (between 5 and 7.5 GHz) are proposed with enhanced isolation features. The systems are comprised of two antennas that are placed parallel and orthogonal to each other, respectively. According to the simulation results, the operating frequency of the MIMO antenna system is 6.3 GHz, and mutual coupling is below −18 dB in a parallel arrangement, whereas they are 6.4 GHz and −25 dB, respectively, in the orthogonal arrangement. The 2 × 3 matrix of C-shaped resonator (CSR) is proposed and placed between the antenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. More than 30 dB isolation between the array elements is achieved at the resonant frequency for both of the configurations. The essential parameters of the MIMO array such as mutual coupling, surface current distribution, envelop correlation coefficient (ECC), diversity gain (DG), and the total efficiency have been simulated to verify the reliability and the validity of the MIMO system in both parallel and orthogonal configurations. The experimental results are also provided and compared for the mutual coupling with simulated results. An adequate match between the measured and simulated results is achieved.

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Dmitriev, V. A., and J. C. W. A. Costa. "Theoretical investigation of compact microstrip resonators with stubs for patch antennas." IEEE Transactions on Microwave Theory and Techniques 50, no. 1 (2002): 27–29. http://dx.doi.org/10.1109/22.981240.

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14

Bijumon, P. V., Sreedevi K. Menon, M. T. Sebastian, and P. Mohanan. "Enhanced bandwidth microstrip patch antennas loaded with high permittivity dielectric resonators." Microwave and Optical Technology Letters 35, no. 4 (October 25, 2002): 327–30. http://dx.doi.org/10.1002/mop.10597.

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15

Assailly, S., C. Terret, J. P. Daniel, G. Besnier, J. Mosig, and B. Roudot. "Spectral domain approach applied to open resonators: application to microstrip antennas." Electronics Letters 24, no. 2 (1988): 105. http://dx.doi.org/10.1049/el:19880069.

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16

Khan, Asif, Suiyan Geng, Xiongwen Zhao, Zahoor Shah, Mishkat Ullah Jan, and Mohamed Abdelkarim Abdelbaky. "Design of MIMO Antenna with an Enhanced Isolation Technique." Electronics 9, no. 8 (July 28, 2020): 1217. http://dx.doi.org/10.3390/electronics9081217.

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The isolation between the microstrip patches has a great significance to examine the performance of the multiple-input-multiple-output (MIMO) antennas. The patch antennas are placed on the top of 1.46 mm thick Rogers RO3003 substrate having a length of 60 mm, a width of 50 mm, and relative permittivity of 3. The distance between the resonators is 0.06λ and they are stimulated by two coaxial probes extended from the bottom ground layer. The defective ground structure of the H-shape slot is inserted on the bottom ground layer to achieve high isolation (mutual coupling reduction). The proposed MIMO antenna operates at 5.3 GHz frequency, which can be used for WiMAX, Wi-Fi, and future 5G services all over the world. The results of the designed structure have been simulated in a finite element method-based solver high-frequency structure simulator (HFSS). The simulated results show that the reflection coefficient (S11) and isolation (S21) at the desired frequency are −32 dB and −41 dB, respectively.

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17

Added, M., K. Rabaani, S. Chabaan, and N. Boulejfen. "Miniaturized Chipless RFID Tags Based on Periodically Loaded Microstrip Structure." Engineering, Technology & Applied Science Research 9, no. 5 (October 9, 2019): 4679–84. http://dx.doi.org/10.48084/etasr.3055.

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A compact chipless radio frequency identification (RFID) tag-based on slow-wave technology is introduced in this paper. The tag consists of a resonant circuit based on open stub resonators periodically loaded by shunt stubs allowing a coding capacity of 9 bits and operating in a frequency range from 2 to 4GHz. The receiving and transmitting antennas of the tag are particularly designed to minimize the tag size as much as possible. The proposed tag presents a robust bit pattern with a compact and fully printable structure using FR4 substrate for a low-cost tag.

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Mallmann, E. J. J., A. S. B. Sombra, J. C. Goes, and P. B. A. Fechine. "Yttrium Iron Garnet: Properties and Applications Review." Solid State Phenomena 202 (May 2013): 65–96. http://dx.doi.org/10.4028/www.scientific.net/ssp.202.65.

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Due to a fast progress in the development of communication systems, the dielectric and magnetic ceramics (ferrites) have become attractive to be used in devices. Although the ferrites of the spinel type were the first material to be used in the microwave range, garnets have smaller dielectric losses and, therefore, are chosen for many applications. High demands for modern electric applications in magnetic materials results in new techniques and products being permanently studied and researched, with a consequent appearance of new solutions for a wide applications series. This work presents the study of the ferrimagnetic composite, constituted by Y3Fe5O12 (YIG) and Gd3Fe5O12 (GdIG) phases, through solid state synthetic route and submitted to high-energy mechanical milling. Additionally, experiments were made in order to evaluate the electric and magnetic behavior of the composites at radio frequency and microwave range and then later suggest an adequate technological application. The composites were efficient as ferrite resonator antennas (FRAs) and microstrip antennas (thick films deposited on metalized surface alumina substrate by screen-printing technique), in the microwave frequency range. The experiments with FRAs showed satisfactory results due to the control of the antennas radiation characteristics and their tuning by the use of an external magnetic field. The composite resonators studied in this work can be important to the development of a third generation (3G) wideband antennas to cell phones and other wireless products.

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Unnikrishnan, Rahul, Olivier Rance, Nicolas Barbot, and Etienne Perret. "Chipless RFID Label with Identification and Touch-Sensing Capabilities." Sensors 21, no. 14 (July 16, 2021): 4862. http://dx.doi.org/10.3390/s21144862.

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This article presents a 14-bit chipless RFID label which, in addition to classical identification feature, can be used as decimal numeric keypad, allowing the deployment of secure access control applications. A low-cost single layer label comprising 10 RF loop scatterers is used to code information in the frequency domain. In addition, each resonator is associated to a digit in the decimal number system, and the difference in the spectrum caused by the touch event is exploited for the detection of each key pressing. The shape of the resonators has been carefully selected to be both highly resonant and to show high sensitivity to the presence or absence of the human finger. The concept is validated by measurements in an office environment using an FCC compliant low-cost chipless reader and microstrip vivaldi antennas. Simple detection algorithms are proposed for both identification and touch sensing in real environment.

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Deng, Manlan. "High-efficiency antenna-to-antenna polarization converters for customized polarization angle deflection." International Journal of Microwave and Wireless Technologies 12, no. 7 (February 10, 2020): 688–94. http://dx.doi.org/10.1017/s175907872000001x.

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AbstractIn this paper, an antenna-to-antenna method to design high-efficiency polarization converters was proposed. Two in-linked split ring resonators (SRRs) were used as the fundamental unit cell, which can effectively make the original linear polarization angle deflected into a customized one (include but not limited to 90°). The same as the process of energy reception and transmitting of microstrip symmetric dipole antennas, the top SRR plays the role of a receiving antenna and the bottom one acts as a transmitting antenna. Under normal illumination, the strong coupling between electric resonance and magnetic resonance can result in high transmission and broad bandwidth. Since the two SRRs act as two independently polarization selective components, the polarization angle of transmitted waves can be easily controlled by rotating the transmitting SRRs around the center. The proposed concept and the design method are validated using numerical simulations, as well as experimental results of three examples for 45, 60 and 90° polarization angle rotation, the polarization conversion ratio of which is about 92.2, 88.9 and 91.9% from 7.5 to 10 GHz.

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Bait-Suwailam, Mohammed M., Omar F. Siddiqui, and Omar M. Ramahi. "Mutual Coupling Reduction Between Microstrip Patch Antennas Using Slotted-Complementary Split-Ring Resonators." IEEE Antennas and Wireless Propagation Letters 9 (2010): 876–78. http://dx.doi.org/10.1109/lawp.2010.2074175.

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22

Singh, Ashish, Mohammad Aneesh, and J. A. Ansari. "Analysis of Microstrip Line Fed Patch Antenna for Wireless Communications." Open Engineering 7, no. 1 (November 10, 2017): 279–86. http://dx.doi.org/10.1515/eng-2017-0034.

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AbstractIn this paper, theoretical analysis of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator is presented. The proposed antenna shows that the dualband operation depends on gap between parasitic element, split-ring resonator, length and width of microstrip line. It is found that antenna resonates at two distinct resonating modes i.e., 0.9 GHz and 1.8 GHz for lower and upper resonance frequencies respectively. The antenna shows dual frequency nature with frequency ratio 2.0. The characteristics of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator antenna is compared with other prototype microstrip line fed antennas. Further, the theoretical results are compared with simulated and reported experimental results, they are in close agreement.

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Yeo, Junho, and Jong-Ig Lee. "Design of a High-Sensitivity Microstrip Patch Sensor Antenna Loaded with a Defected Ground Structure Based on a Complementary Split Ring Resonator." Sensors 20, no. 24 (December 10, 2020): 7064. http://dx.doi.org/10.3390/s20247064.

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A comparative study to determine the most highly sensitive resonant frequency among the first four resonant frequencies of a conventional patch antenna and defected ground structure (DGS)-loaded patch antennas using commonly used DGS geometries in the literature, such as a rectangular slit, single-ring complementary split ring resonators (CSRRs) with different split positions, and double-ring CSRRs (DR-CSRRs) with different locations below the patch, for relative permittivity measurement of planar materials was conducted. The sensitivity performance for placing the DGS on two different locations, a center and a radiating edge of the patch, was also compared. Finally, the effect of scaling down the patch size of the DGS-loaded patch antenna was investigated in order to enhance the sensitivities of the higher order resonant frequencies. It was found that the second resonant frequency of the DR-CSRR DGS-loaded patch antenna aligned on a radiating edge with a half scaled-down patch size shows the highest sensitivity when varying the relative permittivity of the material under test from 1 to 10. In order to validate the simulated performance of the proposed antenna, the conventional and the proposed patch antennas were fabricated on 0.76-mm-thick RF-35 substrate, and they were used to measure their sensitivity when several standard dielectric substrate samples with dielectric constants ranging from 2.17 to 10.2 were loaded. The measured sensitivity of the second resonant frequency for the proposed DGS-loaded patch antenna was 4.91 to 7.72 times higher than the first resonant frequency of the conventional patch antenna, and the measured performance is also slightly better compared to the patch antenna loaded with a meander-line slot on the patch.

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Bedra, Sami, Randa Bedra, Siham Benkouda, and Tarek Fortaki. "Analysis of HTS circular patch antennas including radome effects." International Journal of Microwave and Wireless Technologies 10, no. 7 (April 10, 2018): 843–50. http://dx.doi.org/10.1017/s175907871800034x.

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AbstractIn this paper, the resonant frequencies, quality factors and bandwidths of high Tc superconducting circular microstrip patches in the presence of a dielectric superstrate loading have been studied using Galerkin testing procedure in the Hankel transform domain. The exact Green's function of the grounded dielectric slab is used to derive an electric field integral equation for the unknown current distribution on the circular disc. Thus, surface waves, as well as space wave radiation, are included in the formulation. London's equations and the two-fluid model of Gorter and Casimir are used in the calculation of the complex surface impedance of the superconducting circular disc. Galerkin testing is used in the resolution of the electric field integral equation. Two solutions using two different basis sets to expand the unknown disk currents are developed. The first set of basis functions used is the complete set of transverse magnetic and transverse electric modes of a cylindrical cavity with magnetic side walls. The second set of basis functions used employ Chebyshev polynomials and enforce the current edge condition. The computed values for a wide range of variations of superstrate thickness and dielectric constant are compared with different theoretical and experimental values available in the open literature, showing close agreement. Results are showing that the superstrate parameters should always be kept into account in the design stage of the superconducting microstrip resonators.

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Chair, R., A. A. Kishk, and Kai-Fong Lee. "Comparative study on the mutual coupling between different sized cylindrical dielectric resonators antennas and circular microstrip patch antennas." IEEE Transactions on Antennas and Propagation 53, no. 3 (March 2005): 1011–19. http://dx.doi.org/10.1109/tap.2004.842682.

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Lee, Yoonjae, and Yang Hao. "Characterization of microstrip patch antennas on metamaterial substrates loaded with complementary split-ring resonators." Microwave and Optical Technology Letters 50, no. 8 (2008): 2131–35. http://dx.doi.org/10.1002/mop.23596.

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Patel, Shobhit K., and Christos Argyropoulos. "Enhanced bandwidth and gain of compact microstrip antennas loaded with multiple corrugated split ring resonators." Journal of Electromagnetic Waves and Applications 30, no. 7 (May 2, 2016): 945–61. http://dx.doi.org/10.1080/09205071.2016.1167633.

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Mandal, Tapan, and Santanu Das. "Bandwidth enhancement of microstrip antennas using additional gap-coupled hexagonal shape resonators to the radiating edges." International Journal of Signal and Imaging Systems Engineering 5, no. 4 (2012): 284. http://dx.doi.org/10.1504/ijsise.2012.050322.

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James, Christopher, and Robert N. Dean. "Improved RF Metamaterial Band-Pass Filter Design Using CSRR Structures on LCP Substrate." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, DPC (January 1, 2015): 001016–47. http://dx.doi.org/10.4071/2015dpc-tp61.

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In the past decade, the emergence of man-made structures with unusual electromagnetic properties not seen in nature—commonly known as “metamaterials”—has generated much interest in designing filters, antennas, lenses, and other devices based on negative values of permittivity (ε) and permeability (μ). Manipulating negative values of these electromagnetic parameters has found applications in communication technology and cloaking research by taking advantage of interesting phenomena such as a negative index of refraction and the reverse Doppler Effect. RF and microwave filters with different frequency responses (low-pass, high-pass, band-pass, and band-stop) can be realized by varying microstrip signal line shapes at a frequency of interest due to the fact that the metamaterial frequency response is dependent on the physical dimensions of the structures. For example, the center frequency of a filter can be determined by adjusting the physical dimensions of metamaterial building blocks called split-ring resonators (SRR) or their duals, complementary split-ring resonators (CSRR). To further metamaterial applications, however, non-planar surfaces and effects of curvature on frequency response must also be considered. In this work, an RF metamaterial filter is presented to demonstrate an improvement in the band-pass frequency response from a previous design at Auburn University by enhancing the upper band behavior of the filter. This is achieved by modifying the metamaterial design on the microstrip device to incorporate new additions to the signal line to combine both high-pass and low-pass metamaterial design concepts, resulting in a band-pass response. The filter is designed using a liquid crystal polymer (LCP) slab as a substrate due in part to its dielectric properties, but also to investigate the filter's performance on a flexible structure. An exploration into the roles of different signal line and CSRR dimensions in filter design is given, and a microstrip filter designed using ANSYS HFSS is shown along with simulation results to verify band-pass filter response. LCP was selected due to its excellent RF properties, its resistance to moisture absorption, and its ability to be micromachined.

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Cho, Seo-Yong, In-Tae Kim, and Kug Sun Hong. "Microwave dielectric properties and applications of rare-earth aluminates." Journal of Materials Research 14, no. 1 (January 1999): 114–19. http://dx.doi.org/10.1557/jmr.1999.0018.

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Rare-earth aluminates, LnAlO3 (Ln = Dy, Er, Gd, La, Nd, Pr, Sm, and Y) were prepared using the mixed oxide method, and their microwave dielectric properties were examined at X-band. Most rare-earth aluminates have suitable permittivities and quality factors for applications as dielectric resonators, but a modification of τf is necessary due to the coefficient's large negative value. When considering dielectric properties and lattice matching, YalO3 rather than LaAlO3, was suggested as a promising substrate material for microstrip antennas utilizing high-temperature superconductor thin films. Rare-earth aluminates with a rhombohedral structure exhibited larger permittivities than those with an orthorhombic structure. This difference was attributed to the difference in ionic size and coordination number. It was demonstrated that a nonzero magnetic susceptibility of rare-earth aluminates has an adverse effect on their quality factor. An abrupt variation in the temperature coefficient of permittivity was discussed in terms of oxygen octrahedra tilting.

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Truong Vu Bang Giang, M. Thiel, and A. Dreher. "A unified approach to the analysis of radial waveguides, dielectric resonators, and microstrip antennas on spherical multilayer structures." IEEE Transactions on Microwave Theory and Techniques 53, no. 1 (January 2005): 404–9. http://dx.doi.org/10.1109/tmtt.2004.839945.

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Mishra, Nivedita, Dr Saima Beg, and Anand Kumar Gupta. "Comparative analysis of T and I Shaped Rectangular Mircostrip Patch Antenna for Wireless communication Applications." Journal of University of Shanghai for Science and Technology 23, no. 05 (July 20, 2021): 806–15. http://dx.doi.org/10.51201/jusst/21/06489.

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The following is an abstract of the paper, the mirror image design parameters and effective results for an antenna with a rectangular microstrip overlay using IE3D software is described that outcomes of the simulations and designs are displayed. The probe feed approach was used to generate the microstrip patch pattern. Such patch antennas have been investigated due to their large bandwidth and gain. This antenna is fabricated on an FR-4 epoxy substrate. This antenna’s performance and results are also matched to a standard rectangular patch antenna. Variables are utilized to improve the antenna’s simulation results are as position, space, length, and width of different mirror images T and I shaped antenna slots. The measured results from the simulated design show that the designed construction resonates at various closely separated frequencies that are within the frequency band allotment for wireless applications. At resonance frequencies of 2GHz to 3GHz, the bandwidth and return loss are significantly enhanced.

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Deng, Zhao-Bin, Wen Jiang, Shu-Xi Gong, Yun-Xue Xu, and Yang Zhang. "A NEW METHOD FOR BROADENING BANDWIDTHS OF CIRCULAR POLARIZED MICROSTRIP ANTENNAS BY USING DGS & PARASITIC SPLIT-RING RESONATORS." Progress In Electromagnetics Research 136 (2013): 739–51. http://dx.doi.org/10.2528/pier12122811.

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Serria, Elham A., and Mousa I. Hussein. "Implications of Metamaterial on Ultra-Wide Band Microstrip Antenna Performance." Crystals 10, no. 8 (August 6, 2020): 677. http://dx.doi.org/10.3390/cryst10080677.

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This study is addressing the slotted ring resonator effect on the performance of the ultra-wide band (UWB) microstrip antenna. Two types of metamaterial with double slotted ring resonators (SRR), circular (C-SRR) and square (S-SRR), are studied and implemented on back of the antenna. The design examines the effect of the number of the SRR and its position with respect to the antenna’s ground plane and the rotation of the inner and outer C-SRR rings on different antenna characteristics. The dimensions of the antenna are 45 mm × 31 mm × 1.27 mm. The implementation of the SRR increased the antenna bandwidth to cover the range from 2.2 GHz to 9.8 GHz with rejected bands and frequencies. Antenna simulated characteristics like return loss, maximum gain and radiation pattern are obtained utilizing HFSS. The return loss measurement and the VSWR of the antenna with all SRR configuration studied are in good agreement with simulated results.

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Hamad, Ehab K. I., and Ahmed Abdelaziz. "Metamaterial superstrate microstrip patch antenna for 5G wireless communication based on the theory of characteristic modes." Journal of Electrical Engineering 70, no. 3 (June 1, 2019): 187–97. http://dx.doi.org/10.2478/jee-2019-0027.

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Abstract Metamaterials (MTMs) have received considerable attention due to their novel electromagnetic properties. Their applications include enhancing gain and bandwidth in microstrip antennas. In this article, a dual band microstrip antenna design based on characteristic mode analysis (CMA) using MTM superstrate is proposed for 5G wireless communication. The CMA is used for the modelling, analysis and optimization of the proposed antenna to examine the underlying modal behaviour of the MTM unit cell and to guide mode excitation. The antenna structure consists of a microstrip feed line connected to a rectangular patch. Then triangular split ring resonator unit cell is inserted on the ground of a traditional patch antenna that resonates at 15 GHz to produce additional resonance at 10 GHz. A planar array of 2 × 3 triangle MTM unit cells is used as superstrate to improve the gain and bandwidth at both resonances simultaneously. The optimal distance between MTM superstrate and the antenna patch is determined using the Fabry-Perot cavity theory to maximize power directivity and efficiency of the proposed antenna. The CST microwave studio software is used to model and optimize the proposed antenna. A prototype of the designed antenna that was fabricated showed good agreement between measurement and simulation results.

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Kucukoner, E. M., A. Cinar, U. Kose, and E. Ekmekci. "Electrical Size Reduction of Microstrip Antennas by Using Defected Ground Structures Composed of Complementary Split Ring Resonator." Advanced Electromagnetics 10, no. 1 (April 10, 2021): 62–69. http://dx.doi.org/10.7716/aem.v10i1.1556.

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In this study the effects of using defected ground structures (DGS) composed of a complementary split ring resonator (CSRR) and CSRR with dumbbell (CSRR-D) for rectangular microstrip antennas are investigated. On this aim, two different antennas, which are Antenna B having CSRR etched DGS and Antenna C having CSRR-D etched DGS are designed and fabricated in comparison with the ordinary rectangular patch antenna, which is Antenna A. In both Antennas B and C, CSRR structures are etched in the same position of the ground planes. On the other hand, another ordinary microstrip antenna, called Antenna D, is designed at resonance frequency of Antenna C. For the characterization; resonance frequencies, voltage standing wave ratios, percentage bandwidths, gains, ka values and gain radiation patterns are investigated both in simulations and experiments. The numerical analyses show that 29.39% and 44.49% electrical size reduction (ESR) ratios are obtained for Antenna B and Antenna C, respectively in comparison to Antenna A. The experimental results verify the ESR ratios with 29.15% and 44.94%. Supporting, Antenna C promises 68.12% physical size reduction (PSR) as it is compared with Antenna D. These results reveal that Antenna C is a good alternative for DGS based microstrip electrically small antennas.

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Tung, Phan Duy, Phan Huu Lam, and Nguyen Thi Quynh Hoa. "A MINIATURIZATION OF MICROSTRIP ANTENNA USING NEGATIVE PERMITIVITY METAMATERIAL BASED ON CSRR-LOADED GROUNDFOR WLAN APPLICATIONS." Vietnam Journal of Science and Technology 54, no. 6 (December 7, 2016): 689. http://dx.doi.org/10.15625/0866-708x/54/6/8375.

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A microstrip antenna using negative index metamaterial based on complementary split ring resonator (CSRR)-loaded ground has been investigated in order to miniaturize the size and improve the antenna characteristics. The proposed antennas are designed on FR4 material and simulated results are provided by HFSS software. The metamaterial antenna was reduced 75 % the overall size compared to the normal microstrip antenna. Furthermore, compared with the normal microstrip antenna, the antenna characteristics of the metamaterial antenna were improved significantly. The proposed metamaterial antenna exhibited the antenna resonate at 2.45 GHz, the gain of higher than 6.5 dB and the bandwidth of 110 MHz through the whole WLAN band. The obtained results indicated that the proposed antenna is a good candidate for WLAN applications.

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Najafy, Vahid, and Mohammad Bemani. "Mutual-coupling reduction in triple-band MIMO antennas for WLAN using CSRRs." International Journal of Microwave and Wireless Technologies 12, no. 8 (March 19, 2020): 762–68. http://dx.doi.org/10.1017/s1759078720000215.

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AbstractFor the requirements of low mutual-coupling MIMO antennas for WLAN, a new complementary split-ring resonator (CSRR) unit cell is introduced in this paper. A microstrip-fed Vivaldi antenna array is designed for WLAN applications, where compact triple-band gap-complementary split-ring resonator unit cells are loaded between two antennas to examine the effect of unit cells on the rate of mutual-coupling reduction. By inserting the CSRR, the final design offered an improvement in decoupling by 8.5, 10.5, and 18 dB at 3.65, 4.9, and 5.8 GHz, respectively, compared with the reference antenna. By suppressing surface waves, antenna gain and front-to-back ratio are improved.

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Malyuskin, Oleksandr. "Electromagnetic Characterization of Engineered Materials Using Capacitively Loaded Aperture Sensors." Proceedings 42, no. 1 (November 14, 2019): 31. http://dx.doi.org/10.3390/ecsa-6-06576.

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A novel method for electromagnetic (EM) characterization of engineered artificial materials such as biomaterials, nanomaterials, and composite materials is proposed and experimentally evaluated in this paper. The method is based on resonance transmission properties of capacitively loaded apertures in conductive screens. The advantage of this new method over the existing techniques (free space, loaded waveguide, microstrip and coplanar waveguide resonators, coaxial probe, etc.) is three-fold: (i) resonance EM field enhancement inside the loaded aperture leads to very high sensitivity and therefore accuracy of EM parameters de-embedding, (ii) only small thin samples of material under test are required (with a sample area substantially smaller than squared wavelength of radiation, ~0.01 λ2), (iii) the method is easily scalable over the frequency and wavelength and based on relatively simple permittivity and permeability de-embedding procedure. The experimental setup in the microwave S-band (2–3 GHz) is based on two dipole antennas, capacitive aperture in the conductive screen, unloaded and loaded with material under test, and vector network analyzer (VNA) for signal generation and data acquisition. Analytical de-embedding procedure is developed and applied to the characterization of carbon nanotube (CNT) material microwave absorption. It is demonstrated that the method offers very high accuracy in material characterization based on minimal material samples.

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Li, Linpeng, Shengze Ye, Jianchun Xu, Yanan Hao, Limin Guo, Daquan Yang, and Ke Bi. "Split-ring resonator-based compact microstrip antenna." Modern Physics Letters B 33, no. 04 (February 10, 2019): 1950043. http://dx.doi.org/10.1142/s021798491950043x.

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Compact microstrip antennas based on split-ring resonator (SRR) structure are proposed and fabricated in this paper. The resonant frequency of the antennas is discussed upon different geometric structures. The influencing mechanism of the antenna parameters on resonant frequency is analyzed. The analytical and experimental analyses are carried out and proved that the resonant frequency can be controlled from 13.5 GHz to 17.2 GHz by tuning some of the crucial parameters. A good agreement between the simulations and the measurement results suggests that the proposed antenna can be designed at different resonant frequencies while maintaining a small-size, low-profile structure and good performance.

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Abdalla, Mahmoud Abdelrahman, Zhirun Hu, and Cahyo Muvianto. "Analysis and design of a triple band metamaterial simplified CRLH cells loaded monopole antenna." International Journal of Microwave and Wireless Technologies 9, no. 4 (June 22, 2016): 903–13. http://dx.doi.org/10.1017/s1759078716000738.

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The design and analysis of meta-material inspired loaded monopole antenna for multiband operation are reported. The proposed antenna consists of multi resonators inspired from half mode composite right/left handed cells, which has a simple structure, compact size, and provides multiband functionalities. As a proof of concept, a triple band antenna covering all possible WiMAX operating bands, has been designed, fabricated, and characterized. The hosting monopole patch itself generates resonance for 3.3–3.8 GHz band, whereas the loaded metamaterial cells add extra resonance frequencies. The loading of two resonator cells introduces two extra resonances for 2.5–2.7 GHz and 5.3–5.9 GHz bands, respectively. The antenna's operating principle and design procedures with the aid of electromagnetic full wave simulation and experimental measurements are presented. The antenna has good omnidirectional patterns at all three bands. The monopole patch size is 13.5 × 6.5 mm2and the whole antenna size (including the feed line) is 35 × 32 mm2. Compared with conventional single band microstrip patch radiator, the radiator size of this antenna is only 8.5% at 2.5 GHz, 17% at 3.5 GHz, and 37% at 5.5 GHz.

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Selvaraju, Raghuraman, Muhammad Ramlee Kamarudin, Mohsen Khalily, Mohd Haizal Jamaluddin, and Jamal Nasir. "Dual-Port MIMO Rectangular Dielectric Resonator Antenna for 4G-LTE Application." Applied Mechanics and Materials 781 (August 2015): 24–27. http://dx.doi.org/10.4028/www.scientific.net/amm.781.24.

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A Multi Input Multi Output (MIMO) Rectangular Dielectric Resonator Antenna (RDRA) for 1.8 GHz Long Term Evolution (LTE) applications is investigated and presented. The antenna consisting of two rectangular dielectric resonator elements, both resonators are fed by microstrip feed line is etched on FR4 substrate. The simulated impedance bandwidth for port1 and port2 is 26.38% (1.6176-2.1093 GHz) and 26.80% (1.6146-2.1143GHz) respectively for |S11| ≤ -6dB, which can operate on LTE band 1-4,9,10,35-37 and 39. The gain of the MIMO RDRA is 3.2 dBi and 3.1 dBi at 1.8 GHz for port 1and port 2, respectively. The S-parameters, isolation, gain, and MIMO performance such as correlation coefficient and diversity gain of the presented RDR Antenna have been studied.

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Geng, Peng, Shu Hui Yang, Yue Wang, and Yin Chao Chen. "Miniaturization Design of the 5.8GHz RFID Antenna Based on Metamaterial." Applied Mechanics and Materials 577 (July 2014): 632–35. http://dx.doi.org/10.4028/www.scientific.net/amm.577.632.

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In this paper we designed a 5.8GHZ microstrip antenna whose relative bandwidth is 3.77% and return loss is-36.941dB. It meets the needs of RFID systems.Besides, the resonant frequency of the antennas is reduced to 5.2GHZ, after adding the “I” ring resonator. Also, the paper shows that the other performance of the antenna still meet the RFID system requirements. It is 47.1% of the original size after adjusting the resonant frequency of the antenna to 5. 8GHz.

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Nageswara Rao, L., V. Santhosh Kumar, and M. Basha. "A Compact Circular Patch Antenna for Wireless Network Applications." International Journal of Engineering & Technology 7, no. 2.7 (March 18, 2018): 462. http://dx.doi.org/10.14419/ijet.v7i2.7.10863.

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The compact double-band circular microstrip patch (MPA) with the etched slot for WLAN architecture is designed. A double recurrence circular patch design along space opening slot sustained with a transmission model is intended to acquire double recurrence task. The designed antenna model comprises of circular patch and parasitic - slot resonator. The ground plane is arranged with a space opening resonator. By modifying structure parameters, the microstrip patch works at the upper band (5.2 GHz) and parasitic - opening works at bringing down band (2.4 GHz), the two resonators are emanating with two diverse radiation designs. Remembering the true objective to choose the execution of the designed model and the composed structure shows the arrival misfortune less than - 10 B and it is demonstrated with huge impedance coordinating, enhanced radiation example and great VSWR around 1 over the working groups. The investigated configuration is simulated and analyzed with HFSS. The suggested antenna model is reasonable for wireless LAN applications.

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Lifwarda, Lifwarda, and Firdaus Firdaus. "PEMBUATAN ANTENA MIKROSTRIP MODEL ANGKA 4 UNTUK PENERIMA SINYAL TELEVISA PADA JALUR UHF (ULTRA HIGH FREKUENSI)." Elektron : Jurnal Ilmiah 5, no. 2 (December 13, 2013): 75–80. http://dx.doi.org/10.30630/eji.5.2.57.

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Development of science and technology very rapidly in various fields brought great influence to all aspects of life one of this field of telecommunications. Development of telecommunication technology that bring due faster to hight public demand for telecommunications services users get an easy and fast service are used as medium convey information One of the device in question is antenna. Many type of antennas that have been developed for the reception of televisions signals and are generally made of wires, pipes or aluminium which has large size and weight. Needed for the antenna which has advantages in terms of shape light weight small volume from that can be easily adapted to the priimary device for on the fabrication and can be used for a wide band frequency. The antenna is microstrip antennas capable adjusted in assembly or in other words easily in a microstrip antenna placement. Microstrip antenna models 4 is designed to work in the range frequency 470 – 750 MHz. This antenna has a value of more than -10 dB returnloss to a predetermined range frequency. The measurement results of the antenna resonates at a frequency of 518 MHz gain value obtained by 1 dB, and has a wide bandwidth of 7 MHz, while for polaradiasi shaped bidirectional.

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Ramadan, A. H., J. Costantine, Y. Tawk, C. G. Christodoulou, and K. Y. Kabalan. "Frequency-Tunable and Pattern Diversity Antennas for Cognitive Radio Applications." International Journal of Antennas and Propagation 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/638627.

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Frequency-tunable microstrip antennas, for cognitive radio applications, are proposed herein. The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna. The integration of an open loop resonator- (OLR-) based adjustable bandpass filter into a wideband antenna to transform it into a tunable filter-antenna is presented. The same technique is employed to design a cognitive radio pattern diversity tunable filter-antenna. A good agreement between the simulated and measured results for the fabricated prototypes is obtained. The radiation characteristics of each designed tunable filter-antenna are included herein.

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Abdalla, Mahmoud A., and Zhirun Hu. "Design and analysis of a compact quad band loaded monopole antenna with independent resonators." International Journal of Microwave and Wireless Technologies 10, no. 4 (January 14, 2018): 479–86. http://dx.doi.org/10.1017/s1759078717001453.

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A quad band antenna with good gain and omni-directional pattern is proposed in this paper. The antenna design is based on loading a conventional monopole antenna by three different resonators. The resonators are inspired from the shunt branch of composite right-/left-handed cell. The resonators have a simple structure and compact size. The control of the frequency bands can be achieved arbitrarily and hence the suggested design methodology can be generalized to any required bands. The fabricated antenna prototype is operating at 2.6, 3.35, 5.15, and 6.1 GHz with bandwidth wider than 100 MHz for each band. The antenna's operating principle and design procedures with the aid of electromagnetic full wave simulation are presented. Finally, the experimental results exhibit good agreement with the simulated ones which confirm the proposed designed methodology. The proposed monopole antenna has a patch size of 13.5 mm × 6.5 mm and the whole antenna size (including the feed line) is 35 mm × 32 mm. Compared to conventional single-band microstrip patch radiator size, the proposed quad band radiator has the size of 9, 15, 37.5, and 72.5% at relevant frequency bands.

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Akkole, Suresh, and N. Vasudevan. "Design and Optimization of E Shape Multi Band Microstrip Patch Antenna Using Fractal Geometry for Wireless Communication." Journal of Computational and Theoretical Nanoscience 17, no. 5 (May 1, 2020): 2409–14. http://dx.doi.org/10.1166/jctn.2020.8905.

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In this paper an E shaped multiband fractal microstrip antenna proposed. The proposed E structure uses self similar fractal concept. The geometry is extended up to two iteration which resonates at seven multiband frequencies. The proposed antenna operates in 1–2 GHz (L-band), 2–4 GHz (S-band) and 4–8 GHz (C-band) frequencies and finds uses for military and secure long distance communication and C band frequency uses like satellite communication, Wi-Fi, and Radio Detection and Ranging. All designed antennas are optimized by IE3D antenna simulation tool with FR-4 material having 4.4 dielectric constant and loss tangent = 0.02. The parameters of all antennas have been examined in terms of directivity, VSWR, return loss, resonant frequency, bandwidth and gain.

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Niayesh, Mohsen, and Ammar Kouki. "LTCC-Integrated Dielectric Resonant Antenna Array for 5G Applications." Sensors 21, no. 11 (May 31, 2021): 3801. http://dx.doi.org/10.3390/s21113801.

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A millimeter-wave dielectric resonator antenna array with an integrated feeding network and a novel alignment superstrate in Low Temperature Cofired Ceramics (LTCC) technology is presented. The antenna array consists of 16 cylindrical DR antenna (CDRA) elements operating at 28 GHz for mm-Wave 5G applications. The array is fed by an inverted microstrip corporate feeding network designed and built in the same LTCC stack as the resonators. A grooved and grounded superstrate is introduced to facilitate the alignment of the individual array elements while enhancing the overall performance of the antenna array. The performance of the proposed stack is evaluated numerically and compared with measured data. Measured results show an impedance bandwidth of 9.81% at 28.72 GHz with a maximum realized gain of 15.68 dBi and an efficiency of 88%, and are in excellent agreement with simulations.

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Xu, Jiachen, Bozhang Lan, Jiakai Zhang, Chenjiang Guo, and Jun Ding. "A novel dual-band dual-polarized shared-aperture antenna with high isolation." International Journal of Microwave and Wireless Technologies 12, no. 7 (May 4, 2020): 652–59. http://dx.doi.org/10.1017/s1759078719001454.

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AbstractThis paper presents a novel dual-band (DB) dual-polarized (DP) shared aperture antenna with high isolation by using a combination of microstrip dipoles and dielectric resonator antennas (DRAs) for S and C bands, respectively. In the S band, two sets of proximity coupled stacked microstrip dipoles which crossed at the center are employed to achieve dual-linear polarization (DLP) and obtain desired bandwidth (BW), isolation, and pure polarization. The rectangle DRA with hybrid feed is selected as the C band element for its advantages of small base area and high isolation, and a 2 × 2 array is presented with the “pair-wise” anti-phase feed technique to achieve a low cross-polarized level. Moreover, benefited from the back feed scheme, the proposed antenna has a symmetrical structure and has the potential of expanding into a larger aperture. The proposed antenna has been manufactured and measured, and the results agree well with simulations, which prove the validity of the proposed design.

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Journal articles on the topic 'Microstrip antennas Resonators'

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