The Experts below are selected from a list of 39036 Experts worldwide ranked by ideXlab platform
Yichyun Chiou - One of the best experts on this subject based on the ideXlab platform.
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a quasi elliptic function 1 75 2 25 ghz 3 pole bandpass filter with bandwidth control
IEEE Transactions on Microwave Theory and Techniques, 2012Co-Authors: Yichyun Chiou, Gabriel M. RebeizAbstract:A three-pole microstrip combline filter with a center frequency of 1.75-2.25 GHz and a tunable bandwidth of 70-100 MHz is presented. In this design, an extra Transmission Zero is created using a non-adjacent resonator coupling, and is placed on the lower side of the passband to improve the filter selectivity. The filter bandwidth is also tuned by controlling the non-adjacent resonator coupling. The measured S -parameters, third-order intercept point and power handling, for different center frequencies and bandwidths, are presented and with good agreement with simulations. This topology is simple to implement and requires only one additional tunable component between the first and third resonator for bandwidth control.
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a tunable three pole 1 5 2 2 ghz bandpass filter with bandwidth and Transmission Zero control
IEEE Transactions on Microwave Theory and Techniques, 2011Co-Authors: Yichyun Chiou, Gabriel M. RebeizAbstract:This paper presents a three-pole tunable combline bandpass filter with center frequency, bandwidth, and Zero control. The filter is designed on a Duroid substrate with er=10.2 and h=25 mil . A frequency range of 1.5-2.2 GHz with a 1-dB bandwidth tuning from 50 to 170 MHz (2.2%-11.2% fractional bandwidth) is achieved. The Transmission Zero can also be controlled, and a Zero location of 1.37-1.64 GHz is demonstrated at center frequency fo of 2.05 GHz. The measured third-order intermodulation intercept point and 1-dB power compression point at midband (1.85 GHz) and a bandwidth of 110 MHz are >;15 and 8 dBm, respectively. To our knowledge, this is the first three-pole combline tunable bandpass filter with center frequency, bandwidth, and Transmission Zero control.
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Transmission Zero design graph for dual mode dual band filter with periodic stepped impedance ring resonator
Progress in Electromagnetics Research-pier, 2010Co-Authors: Yichyun Chiou, Pingshiang Yang, Choyuh WuAbstract:Compact dual-mode dual-band bandpass fllters are realized with a single periodic stepped-impedance ring resonator. Neither extra resonator nor substrate layer is required for implementing the second passband. Based on the Transmission line theory, a Transmission Zero design graph consisting of the Transmission Zeros together with the resonant frequencies of the resonator is developed against the space separation angle between the input and output ports. Based on this graph, when the line-to-ring feed structure is implemented, the space angle can be determined for the dual-mode dual-band design with designated Zeros near the two passbands. It is believed that this is the flrst design graph for designating the Transmission poles and Zeros of a dual-mode ring resonator fllter before the excitation structure is realized. Three dual-mode dual-band bandpass fllters are carried out for demonstration. All circuits occupy only 60% of the area of the conventional ring resonator bandpass fllter
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quadruple mode coupled ring resonator bandpass filter with quasi elliptic function passband
IEEE Microwave and Wireless Components Letters, 2008Co-Authors: Uhou Lok, Yichyun Chiou, Jentsai KuoAbstract:Quadruple-mode coupled-ring resonator is used to design quasi-elliptic function bandpass filters (BPFs) with a relatively wide bandwidth. The resonator consists of a pair of coupled rings with two open stubs symmetrically tapped to the inner ring. The stubs are used to move a Transmission Zero near the center frequency to lower transition band. It is believed that it is the first ring resonator BPF based on the coupled-ring to create four Transmission poles and four Transmission Zeros. Two filters with relative bandwidths of 10% and 15% are fabricated and measured. Good agreement between simulation and measurement is obtained.
Gabriel M. Rebeiz - One of the best experts on this subject based on the ideXlab platform.
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a 0 97 1 53 ghz tunable four pole bandpass filter with four Transmission Zeroes
IEEE Microwave and Wireless Components Letters, 2019Co-Authors: Gabriel M. RebeizAbstract:In this letter, a miniature 0.97–1.53-GHz tunable four-pole bandpass filter with constant fractional bandwidth is demonstrated. The filter consists of three quarter-wavelength resonators and one half-wavelength resonator. By introducing cross-coupling, two Transmission Zeroes are generated and are located at both sides of the passband. Also, source–load coupling is employed to produce two extra Transmission Zeroes, resulting in a miniature ( $0.09\lambda _{{\text {g}}}\times 0.1\lambda _{{\text {g}}}$ ) four-pole, four-Transmission Zero filter with high selectivity. The measured results show a tuning range of 0.97–1.53 GHz with an insertion loss of 4.2–2 dB and 1-dB fractional bandwidth of 5.5%. The four Transmission Zeroes change with the passband synchronously, ensuring high selectivity over a wide tuning range. The application areas are in software-defined radios in high-interference environments.
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tunable 1 25 2 1 ghz 4 pole bandpass filter with intrinsic Transmission Zero tuning
IEEE Transactions on Microwave Theory and Techniques, 2015Co-Authors: Tao Yang, Gabriel M. RebeizAbstract:A new concept of tuning Transmission Zeros (TZs) in 4-pole tunable bandpass filters is demonstrated. In this work, the tuning elements that were conventionally used for bandwidth control are also utilized for adjusting the TZs at the same time. As a result, the selectivity of the tunable filter can be controlled without increasing the filter order and complexity. A 4-pole stripline filter is used to demonstrate this concept. The filter can be continuously tuned from 1.25 to 2.1 GHz and two TZs are employed to improve the stopband suppression to $> {\hbox{60 dB}}$ at 200 MHz from the passband. These TZs can also be moved from the upper stopband to the lower stopband without any auxiliary tuning elements to significantly change the stopband suppression. The high rejection filter is useful in wireless systems and cognitive radios with large interferers.
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a quasi elliptic function 1 75 2 25 ghz 3 pole bandpass filter with bandwidth control
IEEE Transactions on Microwave Theory and Techniques, 2012Co-Authors: Yichyun Chiou, Gabriel M. RebeizAbstract:A three-pole microstrip combline filter with a center frequency of 1.75-2.25 GHz and a tunable bandwidth of 70-100 MHz is presented. In this design, an extra Transmission Zero is created using a non-adjacent resonator coupling, and is placed on the lower side of the passband to improve the filter selectivity. The filter bandwidth is also tuned by controlling the non-adjacent resonator coupling. The measured S -parameters, third-order intercept point and power handling, for different center frequencies and bandwidths, are presented and with good agreement with simulations. This topology is simple to implement and requires only one additional tunable component between the first and third resonator for bandwidth control.
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a tunable three pole 1 5 2 2 ghz bandpass filter with bandwidth and Transmission Zero control
IEEE Transactions on Microwave Theory and Techniques, 2011Co-Authors: Yichyun Chiou, Gabriel M. RebeizAbstract:This paper presents a three-pole tunable combline bandpass filter with center frequency, bandwidth, and Zero control. The filter is designed on a Duroid substrate with er=10.2 and h=25 mil . A frequency range of 1.5-2.2 GHz with a 1-dB bandwidth tuning from 50 to 170 MHz (2.2%-11.2% fractional bandwidth) is achieved. The Transmission Zero can also be controlled, and a Zero location of 1.37-1.64 GHz is demonstrated at center frequency fo of 2.05 GHz. The measured third-order intermodulation intercept point and 1-dB power compression point at midband (1.85 GHz) and a bandwidth of 110 MHz are >;15 and 8 dBm, respectively. To our knowledge, this is the first three-pole combline tunable bandpass filter with center frequency, bandwidth, and Transmission Zero control.
Quan Xue - One of the best experts on this subject based on the ideXlab platform.
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bandpass filters designed by Transmission Zero resonator pairs with proximity coupling
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Quan Xue, J Y JinAbstract:The concept of Transmission Zero resonator pair (TZRP) is used in this paper. Based on this TZRP, a new method to induce a passband is demonstrated, by which different types of bandpass filters can be designed. The proposed TZRP is structured by a pair of resonators with different resonant frequencies, which lead not only to two Transmission Zeroes, but also to a Transmission pole between them. Passband filters can then be built by designing the proximity coupling between the TZRPs, as the TZRP works as a basic resonant element. The passband of these filters can be flexibly controlled by the resonators of TZRPs, which determine the locations of the Transmission Zeroes and poles. By carefully allocating the Transmission Zeroes, high selectivity and large out-of-band rejection can be realized. This design method is applied to design filters in two different Transmission media, namely, microstrip line and rectangular waveguide. Simulated and measured results demonstrate the effectiveness of this new approach of bandpass filter design. The designed filters have the properties of small size, easy fabrication, low cost, and low loss.
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planar tri band bandpass filter with compact size
IEEE Microwave and Wireless Components Letters, 2010Co-Authors: Xiu Yin Zhang, Quan XueAbstract:This letter presents a compact planar tri-band bandpass filter with high selectivity. The proposed filter employs two sets of resonators, i.e., stub-loaded resonators and half-wavelength resonators. The former is designed to operate at the first and third passbands and the latter at the second passband. The passband frequencies can be conveniently tuned to desired values. One set of resonators is embedded in the other and thus the filter is compact in size. On each side of each passband, there is at least one Transmission Zero, resulting in high skirt selectivity. For validation, a demonstration filter is implemented. The design methodology and the experimental results are presented.
Zhongxiang Shen - One of the best experts on this subject based on the ideXlab platform.
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synthesis of quasi elliptic bandpass frequency selective surface using cascaded loop arrays
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Zhongxiang ShenAbstract:A new quasi-elliptic bandpass frequency-selective surface (FSS) is presented by cascading a two-dimensional periodic array of double square loops (DSLs) and an array of gridded square loops (GSLs). The proposed FSS can be systematically synthesized based on microwave filter theory. The synthesized FSS can control not only the passband characteristics, but also Transmission-Zero frequencies at both ends of the passband, thus resulting in high selectivity and quasi-elliptic filtering response. The operating principle, detailed synthesis procedure, and implementation guidelines for this FSS are presented and discussed. As an example, a prototype of the proposed FSS is designed, fabricated, and tested. Measured results demonstrate that the proposed FSS has a simple structure, high selectivity, and stable bandpass response under a large variation of the incident angle.
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Dual-Band Ortho-Mode Transducer with Irregularly Shaped Diaphragm
Progress In Electromagnetics Research Letters, 2011Co-Authors: Yun Tao, Zhongxiang Shen, Gang LiuAbstract:A compact dual-band ortho-mode transducer is presented in this paper. Two orthogonally polarized signals received by a square waveguide are separated into two orthogonal channels at 10.7{ 12.75GHz and 10.3{11.9GHz, respectively, while a single-polarized signal is transmitted at 14{14.5GHz. To obtain good isolation between the transmit (Tx) and receive (Rx) channels of the same polarization with a compact size, an irregularly shaped diaphragm is proposed as a compact dual-function resonator, which has one Transmission Zero at the Tx band and one pole at the Rx band. The designed OMT is fabricated and measured in a back-to-back conflguration. Measured results agree very well with simulated ones and the isolation improvement by the diaphragm is about 15dB, which verifles our design.
Mojgan Daneshmand - One of the best experts on this subject based on the ideXlab platform.
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substrate integrated waveguide l shaped iris for realization of Transmission Zero and evanescent mode pole
IEEE Transactions on Microwave Theory and Techniques, 2017Co-Authors: Mehdi Nosrati, Mojgan DaneshmandAbstract:This paper investigates L-shaped iris (LSI) embedded in substrate integrated waveguide (SIW) structures. A lumped element equivalent circuit is utilized to thoroughly discuss the iris behavior in a wide frequency band. This structure has one more degree of freedom and design parameter compared with the conventional iris structures; therefore, it enables design flexibility with enhanced performance. The LSI is utilized to realize a two-pole evanescent-mode filter with an enhanced stopband and a dual-band filter combining evanescent and ordinary modes excitation. Moreover, a prescribed filtering function is demonstrated using the lumped element analysis not only including evanescent-mode pole, but also close-in Transmission Zero. The proposed LSI promises to substitute the conventional posts in (SIW) filter design.
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compact mems based ultrawide band cpw band pass filters with single double tunable notch bands
IEEE Transactions on Components Packaging and Manufacturing Technology, 2014Co-Authors: Mehdi Nosrati, Nahid Vahabisani, Mojgan DaneshmandAbstract:In this paper, novel ultrawide-band (UWB) band-pass filters with single and double tunable notch-bands are described. To the best of our knowledge, this is the first MEMS-based UWB filter reported with double tunable notch-bands. In this design, a new configuration of μ-strip coupled lines integrated with the MEMS capacitor is developed and used for tuning. The proposed structure is analyzed by considering the LC equivalent circuit of the MEMS capacitor and it is shown that an extra Transmission Zero (notch-band) is realized at its resonance. Each notch-band frequency can be independently tuned up to 1 GHz using MEMS capacitors actuation, while the filter performance across its ultrawide pass-band remains unchanged. The proposed filter is suitable for UWB applications when flexible interference blockage is required.
