Articoli di riviste: "UWB MICROWAVE FILTER"

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Vishwanath*, M., Habibulla Khan e Himani Goyal Sharma. "Design and Analysis of Step Impedance Resonator Based UWB Band Pass Filter using MIM Waveguide". International Journal of Recent Technology and Engineering (IJRTE) 8, n. 3 (30 settembre 2019): 4319–21. http://dx.doi.org/10.35940/ijrte.c5181.098319.

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In this paper we have designed and analyzed step impedance resonator based ultra wide-band (UWB) band pass filter using plasmonic MIM waveguide. The UWB band pass filter has been designed by introducing a shot-circuited stub to implement the shunt inductance between two quarter wavelength (λ/4) step impedance resonators. There is a strong coupling between the stubs. The plasmonic UWB band pass filter has been designed at E band (1360-nm to1460-nm) optical wavelength. The band width of plasmonic ultra wide-band band pass filter is very effective compared to narrow-band band pass filter. The reflection and transmission characteristics, variation of reflection and transmission coefficents by varying the dimensions of UWB, field distribution of plasmonic UWB has been realized using full wave simulation by using commercially available CST microwave studio software. The UWB band pass filter can further used for the development of photonic integrated circuits (PICs).

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Motakabber, S. M. A., e M. N. Haidari. "Design of an Interdigital Structure Planar Bandpass Filter for UWB Frequency". International Journal of Electrical and Computer Engineering (IJECE) 8, n. 3 (1 giugno 2018): 1654. http://dx.doi.org/10.11591/ijece.v8i3.pp1654-1658.

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A new topology of miniaturized interdigital structuremicrostrip planar bandpass filter for Ultra-Wideband (UWB) frequency has been discussed in this paper. The proposed design and its simulation have been carried out by using an electromagnetic simulation software named CST microwave studio. The Taconic TLX-8 microwave substrate has been used in this research. The experimental result and analysis have been performed by using the microwave vector network analyzer. The experimental result showed that the -10dB bandwidth of the filter is 7.5GHz. The lower and upper corner frequencies of the filter have been achieved at 3.1GHz and 10.6GHz respectively. At the center frequency of 6.85GHz, the -1dB insertion loss and the -7dB return losshave been observed. The simulated and experimental results are well agreed with a compact size filter of 19×21×0.5mm3.

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Kumar, Harish, e MD Upadhayay. "Design of UWB Filter with WLAN Notch". International Journal of Antennas and Propagation 2012 (2012): 1–4. http://dx.doi.org/10.1155/2012/971097.

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UWB technology- (operating in broad frequency range of 3.1–10.6 GHz) based filter with WLAN notch has shown great achievement for high-speed wireless communications. To satisfy the UWB system requirements, a band pass filter with a broad pass band width, low insertion loss, and high stop-band suppression are needed. UWB filter with wireless local area network (WLAN) notch at 5.6 GHz and 3 dB fractional bandwidth of 109.5% using a microstrip structure is presented. Initially a two-transmission-pole UWB band pass filter in the frequency range 3.1–10.6 GHz is achieved by designing a parallel-coupled microstrip line with defective ground plane structure using GML 1000 substrate with specifications: dielectric constant 3.2 and thickness 0.762 mm at centre frequency 6.85 GHz. In this structure aλ/4 open-circuited stub is introduced to achieve the notch at 5.6 GHz to avoid the interference with WLAN frequency which lies in the desired UWB band. The design structure was simulated on electromagnetic circuit simulation software and fabricated by microwave integrated circuit technique. The measured VNA results show the close agreement with simulated results.

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Zhang, Zhuohang, e Zhongming Pan. "Time Domain Performance of Reconfigurable Filter Antenna for IR-UWB, WLAN, and WiMAX Applications". Electronics 8, n. 9 (9 settembre 2019): 1007. http://dx.doi.org/10.3390/electronics8091007.

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A novel reconfigurable filter antenna with three ports for three dependent switchable states for impulse radio-ultrawideband (IR-UWB)/wireless local area network (WLAN)/worldwide interoperability for microwave access (WiMAX) applications is presented in this paper. Three positive-intrinsic-negative diodes, controlled by direct current, are employed to realize frequency reconfiguration of one ultra-wideband state and two narrowband states (2.4 GHz and 3.5 GHz). The time domain characteristic of the proposed antenna in the ultra-wideband state is studied, because of the features of the IR-UWB system. The time domain analysis shows that the reconfigurable filtering antenna in the wideband state performs similarly to the original UWB antenna. The compact size, low cost, and expanded reconfigurable filtering features make it suitable for IR-UWB systems that are integrated with WLAN/WiMAX communications.

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Murmu, Lakhindar, Santasri Koley, Amit Bage e Sushrut Das. "A Simple WiMAX and RFID Band-Notched UWB Bandpass Filter and Its Susceptibility Study". Journal of Circuits, Systems and Computers 28, n. 11 (ottobre 2019): 1950196. http://dx.doi.org/10.1142/s0218126619501962.

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An ultra-wideband (UWB) bandpass filter (BPF) with a fractional bandwidth (FBW) of about 110%, transmission zero at the high-frequency edge, and band notches at the worldwide interoperability for microwave access (WiMAX) and radio frequency identification (RFID) band is presented in this paper. The filter is based on single short-circuited stub, U-shaped defected ground structure (DGS) array, two U-shaped resonators and two stepped impedance resonators (SIRs). The filter is compact and exhibits a selective filtering characteristic equivalent to a three-pole Chebyshev filter. The design procedure has been described and verified by full-wave electromagnetic (EM) simulation and measurement. The proposed filter has low insertion loss, sharp rejection, and excellent in and out band performance. Due to its applications in WiMAX and RFID systems, the filter may be subjected to high EM radiation from the antenna and nearby sources. Therefore, susceptibility study of such a filter is very important. Hence, the susceptibility study of the band-notched UWB BPF has been carried out by subjecting the structure to an interference source.

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Haider, Amir, MuhibUr Rahman, Mahdi Naghshvarianjahromi e Hyung Seok Kim. "Time-Domain Investigation of Switchable Filter Wide-Band Antenna for Microwave Breast Imaging". Sensors 20, n. 15 (1 agosto 2020): 4302. http://dx.doi.org/10.3390/s20154302.

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This paper investigates the time-domain performance of a switchable filter impulse radio ultra-wideband (IR-UWB) antenna for microwave breast imaging applications. A miniaturized CPW-fed integrated filter antenna with switchable performance in the range of the Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Local Area Network (WLAN) bands could operate well within a 3.0 to 11 GHz frequency range. The time-domain performance of the filter antenna was investigated in comparison to that of the designed reference wideband antenna. By comparing both antennas’ time-domain characteristics, it was seen that the switchable filter antenna had good time-domain resolution along with the frequency-domain operation. Additionally, the time-domain investigation revealed that the switchable filter wide-band antenna performed similarly to the reference wide band antenna. This antenna was also utilized for a tumor detection application, and it was seen that the switchable filter wide-band antenna could detect a miniaturized irregularly shaped tumor easily, which is quite promising. Such an antenna with a good time-domain resolution and tumor detection capability will be a good candidate and will find potential applications in microwave breast imaging.

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Rahman, MuhibUr, Mahdi NaghshvarianJahromi, Seyed Mirjavadi e Abdel Hamouda. "Bandwidth Enhancement and Frequency Scanning Array Antenna Using Novel UWB Filter Integration Technique for OFDM UWB Radar Applications in Wireless Vital Signs Monitoring". Sensors 18, n. 9 (19 settembre 2018): 3155. http://dx.doi.org/10.3390/s18093155.

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This paper presents the bandwidth enhancement and frequency scanning for fan beam array antenna utilizing novel technique of band-pass filter integration for wireless vital signs monitoring and vehicle navigation sensors. First, a fan beam array antenna comprising of a grounded coplanar waveguide (GCPW) radiating element, CPW fed line, and the grounded reflector is introduced which operate at a frequency band of 3.30 GHz and 3.50 GHz for WiMAX (World-wide Interoperability for Microwave Access) applications. An advantageous beam pattern is generated by the combination of a CPW feed network, non-parasitic grounded reflector, and non-planar GCPW array monopole antenna. Secondly, a miniaturized wide-band bandpass filter is developed using SCSRR (Semi-Complementary Split Ring Resonator) and DGS (Defective Ground Structures) operating at 3–8 GHz frequency band. Finally, the designed filter is integrated within the frequency scanning beam array antenna in a novel way to increase the impedance bandwidth as well as frequency scanning. The new frequency beam array antenna with integrated band-pass filter operate at 2.8 GHz to 6 GHz with a wide frequency scanning from the 50 to 125-degree range.

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Firmli, Maroua, e Abdelkarim Zatni. "Design of Ultra-Wideband (UWB) Bandpass Filters Based on Interdigital Edge Coupled Lines: A Review". ITM Web of Conferences 43 (2022): 01004. http://dx.doi.org/10.1051/itmconf/20224301004.

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Since several decades ago, parallel coupled lines have found an extensive range of applications in order to design microwave circuits such us filter, impedance transformers and couplers. It gives advantages in term of low cost, easier integration with other devices and controllable performances by changing coupling coefficient between lines. This paper presents a review of parallel two and three interdigital coupled lines bandpass filters for ultra-Wideband (UWB) communication systems during previous years to achieve a fraction passband from 3.1 GHz to 10.6 GHz and then a FBW that can reach 109%. Different structures such as multiple-mode resonator, Short Circuited Stubs, Open stub, Stepped-impedance resonators and Rectangular Ring have been reportedly used to ameliorate the performances of developed filters.

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Ali, Alaa Mohsen, e ِAli Khalid Jassim. "Design UWB antenna with notch band for WiMAX application". Bulletin of Electrical Engineering and Informatics 12, n. 2 (1 aprile 2023): 815–21. http://dx.doi.org/10.11591/eei.v12i2.4104.

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During the last two decades, radar, remote sensing, and imaging applications have all made use of ultra-wide band (UWB) technology. UWB systems are susceptible to interference from narrowband signals, hence this work provides a single-notch antenna for the UWB system. There are two stages to the design process. After creating the baseband antenna, it is necessary to create a notched band UWB antenna by carving a slot into patch antenna. In the UWB range (3.1-10.6) GHz, the UWB antenna has the dimensions of 20x30 mm with substrate thickness 1.6 mm made from FR4 lossy. The design relative permittivity was 4.3, a rectangular patch with a portion of the ground is used in the design. A typical slot-shaped resonator is connected to the patch to reject a frequency band (3.273-3.81) GHz which is a world interoperability for microwave access (WiMAX) to solve the problem of the interference with other bands in UWB system For WiMAX applications. The suggested UWB filter will achieve notch band response centered at the resonance frequency of 3,4 GHz. Analysis CSTS v2020 software was used to carry out the simulation. Priority should be given to what has been learned rather than what has been accomplished.

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Khattak, Muhammad Irfan, Muhammad Irshad Khan, Zaka Ullah, Gulzar Ahmad e Amad Khan. "Hexagonal Printed Monopole Antenna with Triple Stop Bands for UWB Application". Mehran University Research Journal of Engineering and Technology 38, n. 2 (1 aprile 2019): 335–40. http://dx.doi.org/10.22581/muet1982.1902.08.

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Inherently UWB (Ultra Wideband) communication systems comes with interference problem with some if the existing narrowband communication systems. These bands are stopped with the help of band-stop filter in order to reduce electromagnetic interference However, the complexity and limitations are increased due to these filters, hence this solution is turned down in those applications where design complications and complexity is of concern. Introducing various slots of specific shapes and exact dimensions however, have solved this issue for the researchers around the world. This paper presents a hexagonal PMA (Printed Monopole Antenna) with triple stop bands. The antenna is used for UWB application. The antenna is stopped the WiMAX (Worldwide Interoperability for Microwave Access), WLAN (Wireless Local Area Network) and ITU (International Telecommunication Union) bands. The antenna dimensions are 30x28x16 mm3. FR4 is used between ground and radiating patch with relative permittivity of 4.4. The VSWR (Voltage Standing Wave Ratio) is less than 2 between 3-11 GHz except WiMAX (3.1-3.7 GHz), WLAN (5.1-5.8 GHz) and the ITU frequency band (7.95-8.4 GHz). The antenna is design in CST software.

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Sghir, Elmahjouby, Ahmed Errkik, Jamal Zbitou, Otman Oulhaj, Ahmed Lakhssassi e Mohamed Latrach. "Miniaturized ultra-wideband coplanarwaveguide lowpass filter with extended stop band". Indonesian Journal of Electrical Engineering and Computer Science 19, n. 3 (1 settembre 2020): 1415. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1415-1419.

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In this article, we propose a novel design of large rejected band of miniaturized ultra wide band (UWB) of a planar CPW low pass filter “LPF” based on the use of periodic elements of ‘e’ slots. The goal of this work is to develop a new structure of Low Pass Filter with the following criterion: Miniature, Compact and Easy for Fabrication. The Miniaturization of this structure is achieved by entering the 'e' slot in etching area in the ground of CPW line, to save the standard gap of the adapted coplanar line. The designed coplanar LPF is a compact filter having a large band pass and extended stop band, with the possibility to associate easily with others RF and microwave planar circuits. The entire area of the proposed structure of CPW LPF is 14.3x20 mm2.

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Wang, Qing, e Jianping Yao. "Switchable optical UWB monocycle and doublet generation using a reconfigurable photonic microwave delay-line filter". Optics Express 15, n. 22 (2007): 14667. http://dx.doi.org/10.1364/oe.15.014667.

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Arnedo, Israel, Iván Arregui, Magdalena Chudzik, Fernando Teberio, Aintzane Lujambio, David Benito, Txema Lopetegi e Miguel A. G. Laso. "Passive Microwave Component Design Using Inverse Scattering: Theory and Applications". International Journal of Antennas and Propagation 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/761278.

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We briefly review different synthesis techniques for the design of passive microwave components with arbitrary frequency response, developed by our group during the last decade. We provide the theoretical foundations based on inverse scattering and coupled-mode theory as well as several applications where the devices designed following those techniques have been successfully tested. The main characteristics of these synthesis methods are as follows. (a) They are direct, because it is not necessary to use lumped-element circuit models; just the target frequency response is the starting point. (b) They are exact, as there is neither spurious bands nor degradation in the frequency response; hence, there is no bandwidth limitation. (c) They are flexible, because they are valid for any causal, stable, and passive transfer function; only inviolable physical principles must be guaranteed. A myriad of examples has been presented by our group in many different technologies for very relevant applications such as harmonic control of amplifiers, directional coupler with enhanced directivity and coupling, transmission-type dispersive delay lines for phase engineering, compact design of high-power spurious free low-pass waveguide filters for satellite payloads, pulse shapers for advanced UWB radar and communications and for novel breast cancer detection systems, transmission-typeNth-order differentiators for tunable pulse generation, and a robust filter design tool.

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Song, Yiran, Qingsha S. Cheng e Slawomir Koziel. "Multi-Fidelity Local Surrogate Model for Computationally Efficient Microwave Component Design Optimization". Sensors 19, n. 13 (9 luglio 2019): 3023. http://dx.doi.org/10.3390/s19133023.

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In order to minimize the number of evaluations of high-fidelity (“fine”) model in the optimization process, to increase the optimization speed, and to improve optimal solution accuracy, a robust and computational-efficient multi-fidelity local surrogate-model optimization method is proposed. Based on the principle of response surface approximation, the proposed method exploits the multi-fidelity coarse models and polynomial interpolation to construct a series of local surrogate models. In the optimization process, local region modeling and optimization are performed iteratively. A judgment factor is introduced to provide information for local region size update. The last local surrogate model is refined by space mapping techniques to obtain the optimal design with high accuracy. The operation and efficiency of the approach are demonstrated through design of a bandpass filter and a compact ultra-wide-band (UWB) multiple-in multiple-out (MIMO) antenna. The response of the optimized design of the fine model meet the design specification. The proposed method not only has better convergence compared to an existing local surrogate method, but also reduces the computational cost substantially.

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Sharma, Manish, Prem Chand Vashist, Ibrahim Alsukayti, Nitin Goyal, Divya Anand e Amir H. Mosavi. "A Wider Impedance Bandwidth Dual Filter Symmetrical MIMO Antenna for High-Speed Wideband Wireless Applications". Symmetry 14, n. 1 (27 dicembre 2021): 29. http://dx.doi.org/10.3390/sym14010029.

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This research article reports a compact fractal 4 × 4 UWB extended bandwidth MIMO antenna with physical dimensions of 44 × 44 mm2 for high-speed wireless applications. The reported antenna comprises four fractal radiating elements that are symmetrical and placed orthogonal to each other with a respective rectangular ground printed on the opposite plane. A higher isolation is achieved between the radiating elements by the placement of a fractal patch orthogonally and no separate decoupling structure is required. The antenna offers a −10 dB transmission capacity of 2.84–15.88 GHz. The fractal radiating element, which is embedded by an inverted T-type stub placed within a rectangular slot and an etched rotated C-type slot, provides band-stop filters for WiMAX (Worldwide inter-operability for Microwave Access) and WLAN (wireless local area network)-interfering bands. The key parameters of diversity performance are compared by simulation and measurement (fabricated prototype) of ECC (envelope correlation coefficient), DG (directive gain), TARC (total active reflection coefficient) and CCL (channel capacity loss). The antenna offers an omnidirectional radiation pattern with an average gain of 3.52 dBi.

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Zhang, Xuewei, Shaobin Liu, Kun Liao e Jian Lou. "Surface plasmonic waveguide and ultra-wideband bandpass filter using double-layered glide symmetric corrugated lines". Journal of Physics D: Applied Physics 55, n. 27 (19 aprile 2022): 275104. http://dx.doi.org/10.1088/1361-6463/ac63ff.

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Abstract In this paper, an ultra-wideband high-efficiency bandpass filter based on a surface plasmonic waveguide (SPW) is proposed. The novel SPW consists of double-sided glide symmetric periodic corrugated metal. The dispersion characteristics of the double-layered glide symmetric SPW are analyzed. By using glide symmetry technology, the dispersion curve for the two lowest-order modes of the proposed SPW is a degeneracy at the Brillouin zone boundary, resulting in a higher propagation constant than the traditional symmetric structure with the same geometry. The dispersion relation of the SPW when glide symmetric conditions are broken is also investigated. Based on the proposed double-layered glide symmetric SPW, we design a bandpass filter working in an ultrawide range of frequencies. To realize the high-efficient transmission of the bandpass filter, the matching structure composed of double-layer grooves with gradient variation is designed for the effective mode conversion of quasi-transverse electromagnetic waves and spoof surface plasmonic polariton. The upper cutoff frequency of the passband can be tuned by adjusting the geometric parameters of the corrugated metal unit, and the lower cutoff frequency can be controlled by modifying the coupling distance with the bottom layer. A prototype of an ultra-wideband bandpass filter has been manufactured and measured, showing a reasonable agreement with simulations. The proposed novel UWB bandpass filter with glide symmetry can be widely used in microwave and millimeter wave related communication systems, and may play an important role in the fabrication of advanced plasma functional devices and circuits.

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Mu, Hongqian, e Jianping Yao. "Polarity- and Shape-Switchable UWB Pulse Generation Based on a Photonic Microwave Delay-Line Filter With a Negative Tap Coefficient". IEEE Photonics Technology Letters 21, n. 17 (settembre 2009): 1253–55. http://dx.doi.org/10.1109/lpt.2009.2024643.

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Bolea, Mario, Jose Mora, Beatriz Ortega e Jose Capmany. "Optical UWB pulse generator using an N tap microwave photonic filter and phase inversion adaptable to different pulse modulation formats". Optics Express 17, n. 7 (16 marzo 2009): 5023. http://dx.doi.org/10.1364/oe.17.005023.

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Massamba, Omar Christian, Franck Moukanda Mbango e Désiré Lilonga-Boyenga. "Four Subbands from Dual Mismatched Wideband Bandpass Filter for 5G/WAS/Wi-Fi/WiMAX/WLAN Applications". International Journal of RF and Microwave Computer-Aided Engineering 2023 (14 marzo 2023): 1–13. http://dx.doi.org/10.1155/2023/4713995.

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Based on the simplicity of the design method, this paper presents a new approach for developing matched subbands when splitting two mismatched dual-wideband bandpass filters (BPFs) for the fifth generation (5G), wireless access systems (WAS), wireless fidelity (Wi-Fi), worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN), radar, and other communication devices. The method’s novelty involves using identical quarter-wavelength resonators terminated by alternated short-and-open stub configurations. Both configurations alternate and describe a perfect symmetry by their location from each other to make the subbands possible in the low-frequency and its harmonic (high-frequency) bandwidths (BW). A stub admittance Y 1 is defined and associated with the mainline section characteristic impedance Z 0 and an operating frequency f 0 . A quality factor Q a p is connected to Y 1 and f 0 to approach the BPF global quality factor Q g initially fixed. The stub characteristic impedance and the mainline one differ, while electric lengths (stub and mainline section) are identical. Using the operating frequency determines physical dimensions, creates harmonic frequencies and the rejected BW, mismatches the main frequency BW, matches the subbands, and creates transmission zero (TZ). Hence, a 28.118-dB stopband that separates the two bandpasses at 9.373 GHz is made. At the same time, the unmatched dual ultrawideband (UWB) covers a large panel of communication systems. The lowest (3.146–5.431) and highest (11.891–14.749) GHz BW exhibit a minimum insertion loss (IL) of 0.656 dB and 3.027 dB. The subbands return losses (RL) are better than 28 dB and 19 dB, respectively, and a flat group delay of 0.205 ns is obtained in the upper band. All subbands adaptation methodology is read from 10 dB of the RL. In that case, the four matched subbands in its lower wideband are 3.327–3.709 GHz and 4.442–5.048 GHz, and in its higher wideband are 11.922–12.486 GHz and 14.281–14.653 GHz. The 2275/2858 MHz is the dual-wideband with a fractional BW 53.282/21.456%. The fabricated prototype has validated the EM-simulations, and Anritsu MS4642B 20 GHz vector network analyzer (VNA) has been used for experimental results by scanning the frequency range 3 GHz–15 GHz. The tested prototype is made with a 1 mm FR4 HTG-175 thickness by considering a dielectric constant of 4.4, and its overall size occupies 22.45 × 5.72 m m 2 ( 0.32 λ 0 × 0.082 λ 0 mm 2 ).

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Rius, Manuel, Mario Bolea, Jose Mora, Beatriz Ortega e Jose Capmany. "Multiband-UWB Signals Generation Based on Incoherent Microwave Photonic Filters". IEEE Photonics Technology Letters 26, n. 2 (gennaio 2014): 142–45. http://dx.doi.org/10.1109/lpt.2013.2290315.

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Elhabchi, M., M. N. Srifi e R. Touahni. "A Double Combined Symmetric T-shaped Slots and Rotated L-shaped Strips Inspired UWB Antenna for C and X-band Elimination Filters". Advanced Electromagnetics 9, n. 1 (20 marzo 2020): 35–40. http://dx.doi.org/10.7716/aem.v9i1.1114.

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In this paper, we present a modified UWB antenna with hexagonal slotted ground plane inspired with a double combined symmetric T-shaped slots and dual rotated L-shaped strip for dual band notched characteristics. Initially, the operating frequency range is from 3GHz to 12 GHz. To eliminate the unwanted C-band (3.625-4.2GHz) and the entire uplink and downlink of X-band satellite communication systems (7.25 -8.39 GHz) frequency bands, we are investigating the conventional UWB patch antenna and loaded it with a mentioned strips and slots respectively. The performances of the antenna are optimized both by CST Microwave Studio and Ansoft HFSS. To further analyze the parametric effects of the slots and strips, the surface current distribution is presented and discussed. The antenna gain versus frequency gives an acceptable value except the notched band regions, these values are reduced from its normal to be a negative in the notched bands (3.625-4.2GHz) and (7.25 to 8.39 GHz).

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Motroniuk, I., R. Stöber e G. Fischerauer. "State determination of catalytic converters based on an ultra-wideband communication system". Journal of Sensors and Sensor Systems 4, n. 2 (10 agosto 2015): 255–62. http://dx.doi.org/10.5194/jsss-4-255-2015.

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Abstract. A novel microwave-based approach for monitoring the state of aftertreatment systems such as diesel particulate filters (DPFs), three-way catalytic converters (TWCs), and selective catalytic reduction (SCR) catalysts is proposed. The volume inside the metallic housing of the DPF, TWC, or SCR is considered as a wireless communication channel between two terminals of a communication system. It is shown that, depending on the transmission channel characteristics, the properties of the catalyst, such as the catalyst state, can be inferred. This is done by means of an ultra-wideband (UWB) measurement and the subsequent evaluation and processing of the waveform in the time and frequency domains.

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Hamidi, E., e A. M. Weiner. "Post-Compensation of Ultra-Wideband Antenna Dispersion Using Microwave Photonic Phase Filters and Its Applications to UWB Systems". IEEE Transactions on Microwave Theory and Techniques 57, n. 4 (aprile 2009): 890–98. http://dx.doi.org/10.1109/tmtt.2009.2015126.

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"Design and Analysis of Step Impedance Resonator Based UWB Band Pass Filter using MIM Waveguide". International Journal of Recent Technology and Engineering 8, n. 3 (30 settembre 2019): 4319–21. http://dx.doi.org/10.35940/ijrte.c5182.098319.

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In this paper we have designed and analyzed step impedance resonator based ultra wide-band (UWB) band pass filter using plasmonic MIM waveguide. The UWB band pass filter has been designed by introducing a shot-circuited stub to implement the shunt inductance between two quarter wavelength (λ/4) step impedance resonators. There is a strong coupling between the stubs. The plasmonic UWB band pass filter has been designed at E band (1360-nm to1460-nm) optical wavelength. The band width of plasmonic ultra wide-band band pass filter is very effective compared to narrow-band band pass filter. The reflection and transmission characteristics, variation of reflection and transmission coefficents by varying the dimensions of UWB, field distribution of plasmonic UWB has been realized using full wave simulation by using commercially available CST microwave studio software. The UWB band pass filter can further used for the development of photonic integrated circuits (PICs).

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Alsakka, Mohammed Husam, Mohammed Zewani e Abdelrazak Albadawieh. "Dual UWB bandpass filter with highly band-to-band rejection using stepped impedance stub-loaded resonators for WBAN health-care applications". International Journal of Microwave and Wireless Technologies, 13 ottobre 2023, 1–9. http://dx.doi.org/10.1017/s1759078723001101.

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Abstract With the rapid development of communication technology, the researches of multi-band filtering circuits have become more and more important. Multimode resonator (MMR) is one of the vital methods to provide multi-resonant modes within a single design. In this paper, a dual-band ultra-wideband bandpass filter (UWB-BPF) using stepped impedance stub-loaded resonators (SI-SLR) is presented. The main advantage of using SI-SLR is to have better performance with multimode behavior and more parameters to control resonant modes. SI-SLR combines the advantages of SIR and SLR structures, which gives a compact, high-performance multiband filter. The proposed filter design has compact size, sharp and flat response with low insertion loss (IL), low return loss (RL), and high band-to-band rejection. The filter is designed for UWB communication in wireless body area networks and fabricated on Arlon substrate with relative permittivity ${\varepsilon_{\textrm{r}}} = 3.25$ , thickness $0.8\;{\textrm{mm}}$ . The resulted dual-bands are centered at $4{\textrm{ GHz}}$ and $8.3{\textrm{ GHz}}$ with fractional bandwidths $37{\textrm{% }}$ and $48{\textrm{%}}$ . The simulation was carried out using CST Microwave Studio. The filter provides good passband performances, with IL 0.49 dB and 0.31 dB at the center frequency of lower and higher bands, respectively. The band-to-band 40 dB rejection is realized by adding circular spiral at the input/output of the filter.

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Molimoli Hajamohideen, Masood, e Sreeja Balakrishanapillai Suseela. "Compact multiple electromagnetic band gap (EBG) cells based ultra wide band (UWB) filter with improved stop-band characteristics". Circuit World ahead-of-print, ahead-of-print (11 gennaio 2021). http://dx.doi.org/10.1108/cw-11-2019-0169.

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Abstract (sommario):

Purpose The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and multi-stack electromagnetic band gap (EBG) structure is proposed with improved stop band characteristics at GHz frequency range in this work. This paper proposes a new design for ultra wide band pass filter (resonator BPF) with periodically loaded one-dimensional EBG to achieve the harmonic suppression. This basic EBG structure is developed with combination of a signal strip and ground plane in the slotted section. The resonator BPF is loaded with one EBG, two EBG and three EBGs to improve the stop-band rejection. Design/methodology/approach The proposed filter is with multi-stack EBG cell for achieving good pass band and stop bands performance. Circuit model is analyzed in Section 2. Section 3 discuses band pass filter loaded with one EBG. In Sections 4 and 5, filter with two and three EBG loaded resonators are discussed, respectively. Section 6 is concluded with comparison of simulation and measured results. Findings The stop-band rejection is 20 dB, 40 dB and 50 dB, respectively, in the frequency range of 6 GHz to 20 GHz. The simulation analysis is carried out with advanced system design software. To validate the simulation results, proposed structure is fabricated, and results are found to be in good agreement. Originality/value This paper accounts for designing resonator BPF, which has slow wave pass band and stop band characteristics. Second and third harmonics are suppressed using multi-stack EBG. Various stacks with basic designs are proposed and improved results have been demonstrated which is open for future research.

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27

Liu, Guancong, Xia Xiao, Min Lu, Xuhui Zang, Xiaofeng Zhang e Takamaro Kikkawa. "Ultra‐wideband microwave imaging for breast tumor screening using step recovery diode‐based pulse generator". International Journal of Circuit Theory and Applications, 19 ottobre 2023. http://dx.doi.org/10.1002/cta.3838.

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Abstract (sommario):

SummaryThe feasibility of a multistatic imaging system built on step recovery diode (SRD)‐based pulse generator for microwave breast cancer detection is investigated to develop a low‐cost and portable non‐invasive screening device in the future. The system consists of a pulse generator, an antenna array, and a sampling oscilloscope, in which the pulse generator generates monocycle pulse with a frequency bandwidth from 510 MHz to 6.1 GHz. Experiments are performed on a breast phantom made up of a breast model using 3D printing technology and soybean oil as internal filler, without the usage of any coupling medium. Four identical omnidirectional antennas sequentially transmit ultra‐wideband (UWB) signal and collect signals scattered inside the breast phantom, and then, the interior image of the phantom is reconstructed by background subtraction method and delay and sum (DAS) imaging algorithm. The system can successfully detect and distinguish a variety of test scenarios including cancerous breast phantom containing target with different size and different depth made by iron ball and bacon and healthy breast phantom. The smallest detectable target is 3 mm bacon, with signal to clutter ratio (SCR) and signal to mean ratio (SMR) metrics of 1.63 and 7.79 dB, respectively, and positioning error and relative error of 2.2 mm and 1.7%, respectively. It proves that the proposed time‐domain imaging system is promising for scaling up the detection range of early breast cancer.

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