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Literatura académica sobre el tema "Frequency Reconfigurable Antennas"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 16 de febrero de 2022

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Artículos de revistas sobre el tema "Frequency Reconfigurable Antennas"

Palsokar, A. A. y S. L. Lahudkar. "Review of Reconfigurable Antennas for LTE, WiMAX and WLAN Application". Advanced Electromagnetics 6, n.º 4 (22 de octubre de 2017): 11. http://dx.doi.org/10.7716/aem.v6i4.500.

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To satisfy the requirement of advance wireless system various frequency and pattern reconfigurable antennas are designed. Monopole and PIFA antennas with reconfigurability are preferred for various handheld devices. The objective of this paper was to present a review of reconfigurable monopole and PIFA antennas used for LTE, WiMAX and WLAN frequency ranges. Various optimization techniques used for reconfigurable antenna are also reviewed.

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Sulakshana, Chilukuri y Lokam Anjaneyulu. "Reconfigurable antennas with frequency, polarization, and pattern diversities for multi-radio wireless applications". International Journal of Microwave and Wireless Technologies 9, n.º 1 (4 de junio de 2015): 121–32. http://dx.doi.org/10.1017/s1759078715000926.

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This paper presents different reconfigurable antennas with frequency, polarization, and pattern diversities. All the antennas have a very simple, novel, and compact structures, which are used for different wireless communication applications. These antennas employ switching for obtaining different reconfigurations. At first, an E-shaped antenna is designed for multi-band frequency reconfigurability. Second, circular and rectangular-shaped patch antennas are designed for achieving diversity in polarization. At last, a pattern reconfigurable antenna is designed with multiport excitation. These antenna performances are analyzed using various parameters such as return loss, radiation pattern, voltage standing wave ratio (VSWR), and gain. The prototypes of the antennas are fabricated and measured results along with simulated ones are presented. Both the results are in good agreement.

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Gao, Yanghua, Weidong Lou y Hailiang Lu. "A Reconfigurable Graphene Nanoantenna on Quartz Substrate". Instrumentation Mesure Métrologie 19, n.º 5 (15 de noviembre de 2020): 379–83. http://dx.doi.org/10.18280/i2m.190508.

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In the terahertz (THz) band, conventional metallic antennas are virtually infeasible, due to the low mobility of electrons and huge attenuation. The existing metallic THz antennas need a high power to overcome scattering losses, and tend to have a low antenna efficiency. Fortunately, graphene is an excellent choice of miniaturized antenna in millimeter/THz applications, thanks to its unique electronic properties in THz band. Therefore, this paper presents two miniaturized reconfigurable graphene antennas, and characterizes their performance in terms of frequency reconfiguration, omnidirectional radiation pattern, and radiation efficiency. The proposed graphene antennas were printed on a quartz substrate, and simulated on CST Microwave Studio. The results show that the excellence of the proposed antennas in reflection coefficient, dynamic frequency reconfiguration (DFR), and omnidirectional radiation pattern. The operation frequency of the two antennas varies from 0.74 to 1.26 THz and from 0.92 to 1.15 THz, respectively. The proposed antennas have great prospects in wireless communications/sensors.

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Tariq, Abubakar y Hooshang Ghafouri-Shiraz. "Frequency-Reconfigurable Monopole Antennas". IEEE Transactions on Antennas and Propagation 60, n.º 1 (enero de 2012): 44–50. http://dx.doi.org/10.1109/tap.2011.2167929.

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Premalatha, J., D. Sheela y M. Abinaya. "Reconfiguration of Circular Microstrip Patch Antenna for Wireless Applications". International Journal of Engineering & Technology 7, n.º 3.6 (4 de julio de 2018): 348. http://dx.doi.org/10.14419/ijet.v7i3.6.15130.

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Reconfigurable antennas provide a possible solution to solve the related problems using the ability to switch frequency, patterns and polarization. This paper represents a possible application in wireless communication using reconfigurable Microstrip patch antenna. The dielectric substrate of proposed circular Microstrip patch antenna is fabricated with FR 4 epoxy and patch design 40x40x1.6mm. This work provides a methodology to design reconfigurable antennas with PIN diode switch. The frequency reconfiguration achieved by PIN diodes At the range of 3 GHZ to 6.9 GHZ the frequency reconfigurability is realized. To resonate the antenna at various frequencies PIN diode is used. Simulation of Ansoft HFSS software is used to compute the gain, axial ratio, radiation pattern, and return loss of proposed antenna. The structure of circular patch antenna achieves an enhanced wide bandwidth. The results show a better frequency reconfiguration.

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Anumuthu, Priya, Kaja Sultan, Manavalan Saravanan, Mohd Ali, Manikandan Venkatesh, Mohammad Saleem y Imaduddeen Nizamuddeen. "Design of Frequency Reconfigurable Patch Antenna for Sensing and Tracking Communications". Applied Computational Electromagnetics Society 35, n.º 12 (15 de febrero de 2021): 1532–38. http://dx.doi.org/10.47037/2020.aces.j.351212.

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This paper presents a front-end structure of a reconfigurable patch antenna for cognitive radio systems. The antenna structure consists of an Ultrawideband (UWB) sensing antenna and an array of frequency reconfigurable antennas incorporated on the same substrate. The UWB and reconfigurable antennas are fed by co-planar waveguides (CPW). The reconfigurability is achieved by rotating the series of patch antennas through a certain angle and the rotation is controlled by mechanical means using an Arduino microcontroller. The rotational reconfigurability has been preferred over MEMS switches, PIN diodes, and other lumped elements because the latter requires the need for bias lines. The entire structure is designed using High Frequency Structure Simulator (HFSS) software and the prototype is fabricated over FR-4 substrate having a thickness of 1.6mm and measurements are carried out. This antenna achieves a wideband frequency from 2 GHz to 12 GHz and distinct narrow band of frequencies by reconfigurability using single antenna consisting of different shapes spaced accurately to ensure isolation between adjacent frequency bands and each antenna element working for a bandwidth of 2 GHz for frequency from 2 GHz to 12 GHz upon a single substrate and the reconfigurable elements are controlled using a low cost Arduino microcontroller connected directly to the antenna which ensures accurate controlling of the rotation and fast switching between the antenna elements. The measured results agree with the simulated results and have less than 10 dB impedance bandwidth.

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Mohamadzade, Bahare, Roy B. V. B. Simorangkir, Sasa Maric, Ali Lalbakhsh, Karu P. Esselle y Raheel M. Hashmi. "Recent Developments and State of the Art in Flexible and Conformal Reconfigurable Antennas". Electronics 9, n.º 9 (25 de agosto de 2020): 1375. http://dx.doi.org/10.3390/electronics9091375.

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Reconfigurable antennas have gained tremendous interest owing to their multifunctional capabilities while adhering to minimalistic space requirements in ever-shrinking electronics platforms and devices. A stark increase in demand for flexible and conformal antennas in modern and emerging unobtrusive and space-limited electronic systems has led to the development of the flexible and conformal reconfigurable antennas era. Flexible and conformal antennas rely on non-conventional materials and realization approaches, and thus, despite the mature knowledge available for rigid reconfigurable antennas, conventional reconfigurable techniques are not translated to a flexible domain in a straight forward manner. There are notable challenges associated with integration of reconfiguration elements such as switches, mechanical stability of the overall reconfigurable antenna, and the electronic robustness of the resulting devices when exposed to folding of sustained bending operations. This paper reviews various approaches demonstrated thus far, to realize flexible reconfigurable antennas, categorizing them on the basis of reconfiguration attributes, i.e., frequency, pattern, polarization, or a combination of these characteristics. The challenges associated with development and characterization of flexible and conformal reconfigurable antennas, the strengths and limitations of available methods are reviewed considering the progress in recent years, and open challenges for the future research are identified.

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Sivabalan, A., G. Keerthi Vijayadhasan, T. Thandapani y R. Balamurali. "Design of Frequency Reconfigurable Multiband Compact Antenna". Journal of Computational and Theoretical Nanoscience 17, n.º 8 (1 de agosto de 2020): 3671–75. http://dx.doi.org/10.1166/jctn.2020.9256.

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This paper describes about the designing of a reconfigurable antenna which operates at different frequencies fulfilling the requirement of 1 to 10 GHz WLAN and 3.5 GHz WIMAX antenna applications. The main objective of this research is to minimize the usage of Antennas used in mobile phones for various applications covering 1G, 2G, 3G, 4G, Wi-Fi and Bluetooth. This reconfigurable multiband antenna is used for applications such as WiMAX/WLAN and it has 2 PIN diode switches. The proposed antenna has been analyzed using ADS (Agilent advanced design system) software and fabricated on an FR-4 substrate. The proposed model has a compact structure with an area of about 50 x 45 mm2, and has a slotted ground substrate.

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Pandey, Shraddha y Pankaj Vyas. "Review of Reconfigurable Microstrip Patch antenna for Wireless Application". International Journal on Recent and Innovation Trends in Computing and Communication 7, n.º 6 (22 de junio de 2019): 25–28. http://dx.doi.org/10.17762/ijritcc.v7i6.5317.

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In recent time, world have seen a rapid growth in wireless communication. Development in antenna from single band to dual band and multi band had made the antenna system more compact. A frequency reconfigurable microstrip antenna using a PIN diode for multiband operation is using many application and hot research area. In this paper, reconfigurable microstrip patch antennas and their types like frequency, polarization, radiation pattern and gain are described.

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Motovilova, Elizaveta y Shao Ying Huang. "A Review on Reconfigurable Liquid Dielectric Antennas". Materials 13, n.º 8 (16 de abril de 2020): 1863. http://dx.doi.org/10.3390/ma13081863.

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The advancements in wireless communication impose a growing range of demands on the antennas performance, requiring multiple functionalities to be present in a single device. To satisfy these different application needs within a limited space, reconfigurable antennas are often used which are able to switch between a number of states, providing multiple functions using a single antenna. Electronic switching components, such as PIN diodes, radio-frequency micromechanical systems (RF-MEMS), and varactors, are typically used to achieve antenna reconfiguration. However, some of these approaches have certain limitations, such as narrow bandwidth, complex biasing circuitry, and high activation voltages. In recent years, an alternative approach using liquid dielectric materials for antenna reconfiguration has drawn significant attention. The intrinsic conformability of liquid dielectric materials allows us to realize antennas with desired reconfigurations with different physical constraints while maintaining high radiation efficiency. The purpose of this review is to summarize different approaches proposed in the literature for the liquid dielectric reconfigurable antennas. It facilitates the understanding of the advantages and limitations of this technology, and it helps to draw general design principals for the development of reconfigurable antennas in this category.

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Tesis sobre el tema "Frequency Reconfigurable Antennas"

Borda, Fortuny C. "New frequency reconfigurable antennas for wide frequency range tuning". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1544686/.

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Frequency reconfigurable antennas are becoming a compelling solution for the increasing demand of higher antenna capabilities, since they can operate at tunable narrow frequency bands while rejecting the undesirable signals from other bands. The aim of this project is to develop new designs for frequency reconfigurable antennas that can work across a wide frequency range (from 1 GHz up to 6 GHz) while maintaining stable radiation pattern and polarisation as required by the industry sponsors. A Vivaldi antenna is considered as the basis for a frequency reconfigurable design as it maintains the radiation characteristics in its operating band. Dual-band, tri-band and quad-band switched reconfigurable designs are proposed and analysed. These antennas are electronically-tuned using RF switches which adjust the impedance to reconfigure the operating band of the antenna. A prototype is tested in an anechoic chamber obtaining good performance. However, as the switches lead to several challenges, such as the effect of bias lines and the excessive insertion losses, a new approach is taken. State-of-the-art technologies are studied and fluid antennas are introduced. Current developments show that liquid antennas can have radiation efficiencies up to 90 % and conductivities close to copper, which makes them a good candidate to fulfil the requirements of this project. A hybrid Vivaldi antenna with an ionised water switch is proposed and a prototype tested. By introducing ionised water into a specific point of the feed line the operating frequency of the antenna is adjusted. The replacement of RF switches for electronically-controlled fluids brings high flexibility, suppression of the bias lines impact, dynamic adjustment and continuous frequency tuning compared to conventional antenna systems.

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Sun, Xiaolei y 孙肖磊. "Dual-band and frequency-reconfigurable monopole antennas". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50899880.

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The designs of three compact dual-band monopole antennas for wireless-local-area-network (WLAN)applications are presented. In these designs, an L-or U-shaped monopole element with microstrip-fed is used to generate a high-frequency band at around 5.5 GHz to cover the high WLAN bands at 5.2/5.8GHz for the IEEE 802.11a standard. An E-shaped element, loop element or meander-microstrip ground stub element with coupled-fed through the monopole element is used to generate a low-frequency band at around 2.4 GHz to cover the low WLAN band for the IEEE 802.11b/g standards. With such arrangements, the three antenna shave very compact radiators of only 11.3×8 mm2,12.6×9 mm2and11.8×9.4 mm2. To investigate the performances for practical uses, these antennas are also designed on a mobile-phone printed-circuit board and studied using computer simulation and measurement. Dual-band antennas with reconfigurable Dual-band antennas with reconfigurable lower band, higher band and dual-band are designed in this thesis. The dual-band antenna consists of two radiating branches generating the frequency bands at around 2.4 GHz and 3.5 GHz for the WiMAX system. Varactors are placed on the corresponding branches for continuously tuning of the operating bands for different WiMAX standards. For frequency tuning of the lower band or higher band, simple and novel DC biasing circuits without requiring any soldering wire are proposed to bias the varactor on a radiating element. While for simultaneous frequency tuning of the two individual bands, simple and novel DC biasing circuits requiring two soldering wires are proposed to bias the varactors on the radiating elements. Both simulation and measurement results show that the DC biasing circuits designed have very little affects on the antennas performances. The design of a monopole ultra-wide band (UWB)antenna with a reconfigurable notch band is presented. The antenna employs a vertical-ellipse radiator to achieve an UWB. A compact defected-ground structure (DGS)is used to create a notch band for the antenna. To frequency tune the notch band, a varactor is placed on the DGS to control the resonance frequency. The tuning performance, in terms of reflection coefficient, radiation pattern, efficiency and gain, of the antennais studied using simulation and measurement. Results show that the notch band can be tuned continuously from 5.2 to 6.32 GHz for the WLAN bands. In the measurement of a monopole antenna with a small ground plane, the feeding cable used to connect the antenna to the measurement equipment Satimo Starlab system causes discrepancies between the simulated and measured radiation patterns, efficiencies and peak gains at lower frequencies. In the designs of antennas in this thesis, the cable effects are studied by modeling the feeding cable using the EM simulation tool CST. Results show that, by using the cable model, the simulated and measured results agree very well.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy

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Desjardins, Jason. "Reconfigurable Dielectric Resonator Antennas". Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19838.

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With the increasing demand for high performance communication networks and the proliferation of mobile devices, significant advances in antenna design are essential. In recent years the rising demands of the mobile wireless communication industry have forced antennas to have increased performance while being limited to an ever decreasing footprint. Such design constraints have forced antenna designers to consider frequency agile antennas so that their behavior can adapt with changing system requirements or environmental conditions. Frequency agile antennas used for mobile handset applications must also be inexpensive, robust, and make use of electronic switching with reasonable DC power consumption. Previous works have addressed a number of these requirements but relatively little work has been performed on frequency agile dielectric resonator antennas (DRAs). The objective of this thesis is to investigate the use of DRAs for frequency reconfigurability. DRAs are an attractive option due to their compactness, very low losses leading to high radiation efficiencies (better than 95%) and fairly wide bandwidths compared to alternatives. DRA’s are also well suited for mobile communications since they can be placed on a ground plane and are by nature low gain antennas whose radiation patterns typically resemble those of short electric or magnetic dipoles. One way to electronically reconfigure a DRA, in the sense of altering the frequency band over which the input reflection coefficient of the antenna is below some threshold, is to partially load one face of the DRA with a conducting surface. By altering the way in which this surface connects to the groundplane on which the DRA is mounted, the DRA can be reconfigured due to changes in its mode structure. This connection was first made using several conducting tabs which resulted in a tuning range of 69% while having poor cross polarization performance. In order to address the poor cross polarization performance a second conducting surface was placed on the opposing DRA wall. This technique significantly reduced the cross polarization levels while obtaining a tuning range of 83%. The dual-wall conductively loaded DRA was then extended to include a full electronic implementation using PIN diodes and varactor diodes in order to achieve discrete and continuous tuning respectively. The two techniques both achieved discrete tuning ranges of 95% while the varactor implementation also had a continuous tuning range of 59% while both maintaining an acceptable cross polarization level.

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Tang, Ming-Chun, Zheng Wen, Hao Wang, Mei Li y Richard W. Ziolkowski. "Compact, Frequency-Reconfigurable Filtenna With Sharply Defined Wideband and Continuously Tunable Narrowband States". IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017. http://hdl.handle.net/10150/626120.

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A compact, frequency-reconfigurable filtenna with sharp out-of-band rejection in both its wideband and continuously tunable narrowband states is presented. It is intended for use in cognitive radio applications. The wideband state is the sensing state and operationally covers 2.35-4.98 GHz. The narrowband states are intended to cover communications within the 3.05-4.39 GHz range, which completely covers the Worldwide Interoperability for Microwave Access (WiMAX) band and the satellite communications C-band. A p-i-n diode is employed to switch between these wide and narrowband operational states. Two varactor diodes are used to shift the operational frequencies continuously among the narrowband states. The filtenna consists of a funnel-shaped monopole augmented with a reconfigurable filter; it has a compact electrical size: 0.235 lambda(L) x 0.392 lambda(L), where the wavelength lambda(L) corresponds to the lower bound of its operational frequencies. The measured reflection coefficients, radiation patterns, and realized gains for both operational states are in good agreement with their simulated values.

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Li, Hui. "Decoupling and Evaluation of Multiple Antenna Systems in Compact MIMO Terminals". Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96239.

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Research on multiple antenna systems has been a hot topic in recent years due to the demands for higher transmission rate and more reliable link in rich scattering environment in wireless communications. Using multiple antennas at both the transmitter side and the receiver side increases the channel capacity without additional frequency spectrum and transmitted power. However, due to the limited space at the size-limited terminal devices, the most critical problem in designing multiple antennas is the severe mutual coupling among them. The aim of this thesis is to provide compact, decoupled and efficient multiple antenna designs for terminal devices. At the same time, we propose a simple and cost effective method in multiple antenna measurement. All these efforts contribute to the development of terminal devices for the fourth generation wireless communication. The background and theory of multiple antenna systems are introduced first, in which three operating schemes of multiple antenna systems are discussed. Critical factors influencing the performance of multiple antenna systems are also analyzed in details. To design efficient multiple antenna systems in compact terminals, several decoupling methods, including defected ground plane, current localization, orthogonal polarization and decoupling networks, are proposed. The working mechanism and design procedure of each method are introduced, and their effectiveness is compared. Those methods can be applied to most of the terminal antennas, reducing the mutual coupling by at least 6dB. In some special cases, especially for low frequency bands below 1GHz, the chassis of the device itself radiates like an antenna, which complicates the antenna decoupling. Thus, we extend the general decoupling methods to the cases when the chassis is excited. Based on the characteristic mode analysis, three different solutions are provided, i.e., optimizing antenna locations, localizing antenna currents and creating orthogonal modes. These methods are applied to mobile phones, providing a more reliable link and a higher transmission rate, which are evaluated by diversity gain and channel capacity, respectively. In order to measure the performance of multiple antenna systems, it is necessary to obtain the correlation coefficients. However, the traditional measurement technique, which requires the phase and polarization information of the radiation patterns, is very expensive and time consuming. In this thesis, a more practical and convenient method is proposed. Fairly good accuracy is achieved when it is applied to various kinds of antennas. To design a compact and efficient multiple antenna system, besides the reduction of mutual coupling, the performance of each single antenna is also important. The techniques for antenna reconfiguration are demonstrated. Frequency and pattern reconfigurable antennas are constructed, providing more flexibility to multiple antenna systems.
QC 20120604

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Gokalp, Nihan. "Beam Steerable Meanderline Antenna Using Varactor Diodes And Reconfigurable Antenna Designs By Mems Switches". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609982/index.pdf.

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Recently, reconfigurable antennas have attracted significant interest due to their high adaptation with changing system requirements and environmental conditions. Reconfigurable antennas have the ability to change their radiation pattern, frequency or polarization independently according to the application requirements. In this thesis, three different reconfigurable antenna structures have been designed
beam-steerable meanderline antenna, dual circularly polarized meanderline antenna and dual-frequency slot-dipole array. Traveling wave meanderline antenna arrays are investigated in detail and a beam-steerable traveling wave meanderline antenna array has been introduced for X-band applications. Beam-steering capability of the antenna array has been achieved by loading the antenna elements with varactor diodes. Theoretical analysis and computer simulations of the proposed antenna have been verified with experimental results. Radiation direction of the 8-element meanderline array can be rotated 10°
by changing the varactor diode&rsquo
s bias voltage from 0V up to 20V. Also, a polarization-agile meanderline antenna array has been designed and simulated. Polarization of the circularly polarized meanderline array can be altered between right hand circularly polarized and left hand circularly polarized by using RF MEMS switches. The third type of reconfigurable antenna investigated in this thesis is a dual frequency slot-dipole array operating at X- and Ka-band. Electrical length of the slot dipoles has been tuned by using RF MEMS switches. Antenna prototypes have been manufactured for &lsquo
on&rsquo
and &lsquo
off&rsquo
states of RF MEMS switches and it has been shown that the operating frequency can be changed between 10 GHz and 15.4 GHz.

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Mopidevi, Hema Swaroop. "Micro Electro Mechanical Systems Integrated Frequency Reconfigurable Antennas for Public Safety Applications". DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/744.

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This thesis work builds on the concept of reconfiguring the antenna properties (frequency, polarization, radiation pattern) using Radio Frequency (RF) Micro Electro Mechanical Systems (MEMS). This is a part of the overall research performed at the RF Micro/Nano Electro Mechanical Systems (uNeMS) Laboratory at Utah State University, which includes design, microfabrication, test, and characterization of uNeMS integrated cognitive wireless communication systems (Appendix A). In the first step, a compact and broadband Planar Inverted F Antenna (PIFA) is designed with a goal to accommodate reconfigurability at a later stage. Then, a Frequency Reconfigurable Antenna (FRA) is designed using MEMS switches to switch between the Public Safety (PS) bands, 152-162 MHz and 406-512 MHz, while maintaining the integrity of radiation pattern for each band. Finally, robust mechanical designs of the RF MEMS switches accompanied by different analyses have been performed. These analyses are instrumental in obtaining high yield, reliable, robust microfabrication processes including thin film metal deposition and patterning.

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Cure, David. "Reconfigurable Low Profile Antennas Using Tunable High Impedance Surfaces". Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4659.

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This dissertation shows a detailed investigation on reconfigurable low profile antennas using tunable high impedance surfaces (HIS). The specific class of HIS used in this dissertation is called a frequency selective surface (FSS). This type of periodic structure is fabricated to create artificial magnetic conductors (AMCs) that exhibit properties similar to perfect magnetic conductors (PMCs). The antennas are intended for radiometric sensing applications in the biomedical field. For the particular sensing application of interest in this dissertation, the performance of the antenna sub-system is the most critical aspect of the radiometer design where characteristics such as small size, light weight, conformability, simple integration, adjustment in response to adverse environmental loading, and the ability to block external radio frequency interference to maximize the detection sensitivity are desirable. The antenna designs in this dissertation are based on broadband dipole antennas over a tunable FSS to extend the usable frequency range. The main features of these antennas are the use of an FSS that does not include via connections to ground, their low profile and potentially conformal nature, high front-to-back radiation pattern ratio, and the ability to dynamically adjust the center frequency. The reduction of interlayer wiring on the tunable FSS minimizes the fabrication complexity and facilitates the use of flexible substrates. This dissertation aims to advance the state of the art in low profile tunable planar antennas. It shows a qualitative comparison between antennas backed with different unit cell geometries. It demonstrates the feasibility to use either semiconductor or ferroelectric thin film varactor-based tunable FSS to allow adjustment in the antenna frequency in response to environment loading in the near-field. Additionally, it illustrates how the coupling between antenna and HIS, and the impact of the varactor losses affect the antenna performance and it shows solutions to compensate these adverse effects. Novel hybrid manufacturing approaches to achieve flexibility on electrically thick antennas that could be transitioned to thin-film microelectronics are also presented. The semiconductor and ferroelectric varactor-based tunable low profile antennas demonstrated tunability from 2.2 GHz to 2.65 GHz with instantaneous bandwidths greater than 50 MHz within the tuning range. The antennas had maximum thicknesses of λ/45 at the central frequency and front to back-lobe radiation ratios of approximately 15dB. They also showed impedance match improvement in the presence of a Human Core Model (HCM) phantom at close proximity distances of the order of 10-20 mm. In addition, the use of thin film ferroelectric Barium Strontium Titanate (BST) varactors in the FSS layer enabled an antenna that had smaller size, lower cost and less weight compared to the commercially available options. The challenging problems of fabricating robust flexible antennas are also addressed and novel solutions are proposed. Two different types of flexible antennas were designed and built. A series of flexible microstrip antennas with slotted grounds which demonstrated to be robust and have 42% less mass than typically used technologies (e.g., microstrip antennas fabricated on Rogers® RT6010, RT/duroid® 5880, etc.); and flexible ferroelectric based tunable low profile antennas that showed tunability from 2.42 GHz to 2.66 GHz using overlapping metallic plates instead of a continuous ground plane. The bending test results demonstrated that, by placing cuts on the ground plane or using overlapping metallic layers that resemble fish scales, it was possible to create highly conductive surfaces that were extremely flexible even when attached to other solid materials. These new approaches were used to overcome limitations commonly encountered in the design of antennas that are intended for use on non-flat surfaces. The material presented in this dissertation represents the first investigation of reconfigurable low profile antennas using tunable high impedance surfaces where the desired electromagnetic performance as well as additional relevant features such as robustness, low weight, low cost and low complexity were demonstrated.

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Erdil, Emre. "Tunable Frequency Microstrip Antennas By Rf-mems Technology". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606022/index.pdf.

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This thesis presents the design, fabrication, and measurement of tunable frequency microstrip antennas using RF MEMS (Microelectromechanical Systems) technology. The integration of RF MEMS components with radiators enable to implement tunable systems due to the adjustable characteristics of RF MEMS components. In the frame of this thesis, different types of structures have been investigated and designed. The first structure consists of a microstrip patch antenna which is loaded with a microstrip stub whose length is controlled by RF MEMS switches. In the other structure, the length of a microstrip patch antenna is changed by connecting a metal plate using RF MEMS switches. The third structure is composed of a microstrip patch antenna and a microstrip stub on which RF MEMS variable capacitors are placed periodically to control the resonant frequency. In order to maintain an easier integration with RF MEMS capacitors, another structure consisting of a microstrip patch antenna and a coplanar waveguide (CPW) stub which is loaded with variable RF MEMS capacitors is designed. The final structure is a dual frequency CPW-fed rectangular slot antenna whose resonant frequencies are shifted by RF MEMS variable capacitors placed on a short circuited stub inserted inwards the antenna. The fabrication of CPW-fed rectangular slot antenna is completed in the MEMS fabrication facilities of METU using RF MEMS process based on electroforming on glass substrate. The measurement results show that RF MEMS components might be a proper solution to obtain tunable frequency antenna structures.

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Guclu, Caner. "Dual Frequency Reconfigurable Reflectarray Antenna Of Split Ring Elements With Rf Mems Switches". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612449/index.pdf.

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Dual band (K and Ka) electronically scanning reflectarray with RF MEMS switches is designed, implemented and measured. Unit cell of the reflect array is composed of conductor backed split-ring elements. In order to steer the beam, the phase of the incident circularly polarized wave is controlled by RF MEMS switches that modify the angular orientation of split-rings individually. Reflectarray is designed using unit cell approach with periodic boundary conditions. The antenna is fabricated by using surface micromachining process developed in METU MEMS Center. Radiation patterns of the antenna are measured and compared with the simulations. It has been shown that the reflectarray is capable of beam switching to 35°
in Ka band, 24°
in K band.

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Más fuentes

Libros sobre el tema "Frequency Reconfigurable Antennas"

(Editor), Constantine Balanis, ed. Reconfigurable Antennas (Synthesis Lectures on Antennas and Propagation). Morgan & Claypool Publishers, 2007.

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Capítulos de libros sobre el tema "Frequency Reconfigurable Antennas"

Yadav, Dinesh y Vivekanand Tiwari. "Frequency Reconfigurable Planner Antennas for Wireless Applications: A Review". En Smart Trends in Computing and Communications: Proceedings of SmartCom 2020, 193–200. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5224-3_18.

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Janisha, R. S., D. Vishnu y O. Sheeba. "Frequency Reconfigurable Circular Patch Antenna". En Intelligent Data Communication Technologies and Internet of Things, 109–18. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9509-7_10.

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Cheng, Yong, ZhenYa Wang, XuWen Liu y HongBo Zhu. "A Frequency Reconfigurable Microstrip Patch Antenna". En Lecture Notes in Electrical Engineering, 925–31. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01273-5_104.

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Jin, Guiping, Chuhong Deng y Guangde Zeng. "A Novel Differential Dipoles Frequency Reconfigurable Antenna". En Communications in Computer and Information Science, 126–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0893-2_14.

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Iliyasu, Adamu Y., Mohamad Rijal Bin Hamid, Mohamad Kamal A. Rahim, Noor Asmawati Samsuri y Mohd Fairus Bin Mohd Yusoff. "Multi-band Frequency Reconfigurable Metamaterial Antenna Design". En 10th International Conference on Robotics, Vision, Signal Processing and Power Applications, 425–31. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6447-1_54.

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Sharma, Abha, Rahul Suvalka, Amit Kumar Singh, Santosh Agrahari y Amit Rathi. "A Rectangular Annular Slotted Frequency Reconfigurable Patch Antenna". En Advances in Communication, Devices and Networking, 255–61. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4932-8_28.

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Puri, Ridhima, Nimisha Sharma, Asmita Rajawat y Sindhu Hak Gupta. "Frequency Reconfigurable Antenna for Energy Efficient WBAN Application". En Proceedings of International Conference on Communication and Artificial Intelligence, 31–40. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6546-9_4.

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Devi, Perla y Valluri Rajya Lakshmi. "Patch Rotation-Based Frequency Reconfigurable Antenna for Wireless Applications". En Proceedings of 2nd International Conference on Micro-Electronics, Electromagnetics and Telecommunications, 123–34. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4280-5_13.

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Manikandan, P., P. Sivakumar y C. Swedheetha. "Design of Adaptive Frequency Reconfigurable Antenna for MIMO Applications". En Soft Computing in Data Analytics, 203–13. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0514-6_21.

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Awan, Wahaj Abbas, Niamat Hussain, Adnan Ghaffar, SyedaIffat Naqvi, Abir Zaidi, Musa Hussain y Xue Jun Li. "A Low Profile Frequency Reconfigurable Antenna for mmWave Applications". En Lecture Notes in Electrical Engineering, 1073–83. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6893-4_97.

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Actas de conferencias sobre el tema "Frequency Reconfigurable Antennas"

Shah, Hamil, Abdullahi Inshaar, Chengzhe Zou, Shreyas Chaudhari, Saad Alharbi, Asimina Kiourti y Ryan L. Harne. "Multiphysics Modeling and Experimental Validation of Reconfigurable, E-Textile Origami Antennas". En ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85603.

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Physical deformation mechanisms are emerging as compelling and simple ways to adapt radio frequency (RF) characteristics of antennas in contrast to digital steering approaches acting on topologically fixed antennas. Concepts of physical reconfigurability also enable exceptional capabilities such as deployable and morphing antenna arrays that serve multiple functions and permit compact transport with ease. Yet, the emergent concepts lack broad understanding of effective approaches to integrate conformal, electrically conductive architectures with high-compliance foldable frameworks. To explore this essential interface where electrical demands and mechanical requirements may conflict, this research introduces a new class of origami-based tessellated antennas whose RF characteristics are self-tuned by physical reconfiguration of the antenna shape. E-textile materials are used to permit large antenna shape change while maintaining electrical conductivity. Dipole and patch antennas are considered as conventional antenna platforms upon which to innovate with the e-textile origami concept. Multiphysics modeling efforts establish the efficacy of foldable antenna geometries for broad tailoring of the RF characteristics. Experiments with proof-of-concept antennas confirm the large adaptability of wave radiation properties enabled by the reconfiguration of the e-textile origami surfaces. The results suggest that e-textile antennas can be integrated into clothing and mechanical structures, providing a non-invasive way of quantifying deformation for a wide range of applications.

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Saintsing, Christy D., Benjamin S. Cook y Manos M. Tentzeris. "An Origami Inspired Reconfigurable Spiral Antenna". En ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35353.

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Modern day systems often require reconfigurability in the operating parameters of the transmit and receive antennas, such as the resonant frequency, radiation pattern, impedance, or polarization. In this work a novel approach to antenna reconfigurability is presented by integrating antennas with the ancient art of origami. The proposed antenna consists of an inkjet printed center-fed spiral antenna, which is designed to resonate at 1.0GHz and have a reconfigurable radiation pattern while maintaining the 1.0GHz resonance with little variation in input impedance. When flat, the antenna is a planar spiral exhibiting a bidirectional radiation pattern. By a telescoping action, the antenna can be reconfigured into a conical spiral with a directional pattern and higher gain, which gives the antenna a large front-to-back ratio. Construction of the antenna in this manner allows for a simple, lightweight, transportable antenna that can expand to specifications in the field.

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Cleetus, Ros Marie C. y G. Josemin Bala. "Frequency reconfigurable antennas: A review". En 2017 International Conference on Signal Processing and Communication (ICSPC). IEEE, 2017. http://dx.doi.org/10.1109/cspc.2017.8305830.

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Agarwal, Sweta, Ananjan Basu, Mahesh P. Abegaonkar y S. K. Koul. "Frequency reconfigurable active antenna". En 2014 International Symposium on Antennas & Propagation (ISAP). IEEE, 2014. http://dx.doi.org/10.1109/isanp.2014.7026543.

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Abou Al-alaa, M., Hala A. Elsadek, Esmat A. Abdallah y E. A. Hashish. "PIFA frequency reconfigurable antenna". En 2014 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2014. http://dx.doi.org/10.1109/aps.2014.6904955.

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Jing Liang y H. Yang. "Frequency reconfigurable printed inverted-F antennas". En 2008 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2008. http://dx.doi.org/10.1109/aps.2008.4619624.

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Bossard, J. A., D. H. Werner, T. S. Mayer y R. P. Drupp. "Reconfigurable infrared frequency selective surfaces". En IEEE Antennas and Propagation Society Symposium, 2004. IEEE, 2004. http://dx.doi.org/10.1109/aps.2004.1330576.

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Cetiner, B. A., Q. Xu y L. Jofre. "Frequency reconfigurable annular slot antenna". En 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396881.

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Chang won Jung, Yong jin Kim, Ilkyu Kim y Young eil Kim. "Macro-micro frequency reconfigurable antenna". En 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396883.

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Ismail, M. F., M. K. A. Rahim, H. A. Majid, M. R. Hamid, M. R. Kamarudin y N. A. Murad. "Frequency reconfigurable aperture coupled antenna". En 2012 6th European Conference on Antennas and Propagation (EuCAP). IEEE, 2012. http://dx.doi.org/10.1109/eucap.2012.6206472.

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Informes sobre el tema "Frequency Reconfigurable Antennas"

Sarabandi, Kamal. Compact Reconfigurable High-Frequency Ultrahigh Frequency (HG-UHF) Antenna. Fort Belvoir, VA: Defense Technical Information Center, enero de 2003. http://dx.doi.org/10.21236/ada424574.

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