Journal ArticleDOI
Design of Wide-Stopband Bandpass Filter and Diplexer Using Uniform Impedance Resonators
Fu-Chang Chen,Hao-Tao Hu,Run-Shuo Li,Jian-Feng Chen,Luo Di,Qing-Xin Chu,Michael J. Lancaster +6 more
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TLDR
In this article, a simple and effective method to design wide-stopband bandpass filters and diplexers using uniform impedance resonators is proposed, and the design equations and design rules for both homogeneous and inhomogeneous mediums are given in detail.Abstract:
This paper proposes a simple and effective method to designing wide-stopband bandpass filters and diplexers using uniform impedance resonators. Microstrip terminated parallel coupled lines are utilized to generate the filtering functions. By adjustment of the electrical lengths of the parallel coupled lines and open-circuited stubs, multiple transmission zeros can be obtained. Appropriate positioning of these zeros enables the suppression of spurious frequencies. A complete analytic analysis is proposed to fully control the positions of transmission zeros, and the design equations and design rules for both homogeneous and inhomogeneous mediums are given in detail. Different combinations of the frequency position of the transmission zeros can provide various characteristics. To extend the stopband bandwidth, one or more transmission zeros can be distributed on different harmonic frequencies. To demonstrate the proposed method, two bandpass filters and a diplexer are designed and fabricated. The measured results are in good agreement with the simulated ones. The first filter provides a high attenuation of 40 dB up to 6.8 times the fundamental frequency $(f_{{{0}}})$ and the second filter provides a lower attenuation of 28 dB, but this time extending up to $14.9f_{{{0}}}$ .read more
Citations
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Journal ArticleDOI
A Wide Stopband Filtering Patch Antenna and its Application in MIMO System
TL;DR: This communication presents a wide stopband filtering antenna element and its application in multi-input multi-output (MIMO) system and the measured and simulated results agree well.
Journal ArticleDOI
Tunable Substrate Integrated Waveguide Diplexer With High Isolation and Wide Stopband
TL;DR: A tunable multilayer diplexer using substrate integrated waveguide (SIW) technology is proposed in this paper, where a varactor diode is placed in the structure in such a way that both channels can be tuned independently without affecting one another.
Journal ArticleDOI
New Dual-/Tri-Band Bandpass Filters and Diplexer With Large Frequency Ratio
TL;DR: In this article, the authors proposed a new use of aperture coupling mechanism to combine two bandpass elements for dual/tri-band operation with large frequency ratio but comparable sizes, which can satisfy the simultaneous requirements of future wireless communication systems on short-range high-speed data transmission and long-distance basic coverage.
Journal ArticleDOI
High-Isolation and Wide-Stopband SIW Diplexer Using Mixed Electric and Magnetic Coupling
TL;DR: A high-isolation and wide-stopband diplexer with controllable transmission zero nearby the passband, is implemented using substrate integrated waveguide elements and good agreement between simulation and measurement can be observed.
Journal ArticleDOI
Single-Band and Switchable Dual-/Single-Band Tunable BPFs With Predefined Tuning Range, Bandwidth, and Selectivity
TL;DR: A new kind of highly flexible frequency-agile bandpass filters (FA-BPFs) based on the novel synchronously tuned dual-mode resonator (STDR) with very simple and highly flexible design/control procedures is presented.
References
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Book
Microstrip filters for RF/microwave applications
TL;DR: In this paper, the authors present a general framework for coupling matrix for Coupled Resonator Filters with short-circuited Stubs (UWB) and Cascaded Quadruplet (CQ) filters.
Journal ArticleDOI
Bandpass Filters Using Parallel Coupled Stripline Stepped Impedance Resonators
M. Makimoto,S. Yamashita +1 more
TL;DR: In this paper, approximate design formulas for bandpass filters using parallel coupled stripling stepped impedance resonators (SIR) are derived, taking into account the arbitrary coupling length as well as quarter-wavelength coupling.
Journal ArticleDOI
Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth
Jen-Tsai Kuo,E. Shih +1 more
TL;DR: In this paper, the fundamental and higher order harmonics of an SIR were analyzed against the length ratio of the high-Z and low-Z segments to obtain an optimal length ratio for each high-z to low-z impedance ratio to maximize the upper rejection bandwidth.
Journal ArticleDOI
New microstrip "Wiggly-Line" filters with spurious passband suppression
Txema Lopetegi,Miguel A. G. Laso,J. Hernandez,M. Bacaicoa,D. Benito,M.J. Garde,M. Sorolla,Marco Guglielmi +7 more
TL;DR: In this paper, a parallel-coupled-line microstrip bandpass filter with suppressed spurious passband is presented, where the wave impedance is modulated so that the harmonic passband of the filter is rejected while the desired passband response is maintained virtually unaltered.
Journal ArticleDOI
Coupled Transmission Line Networks in an Inhomogeneous Dielectric Medium
A.K. Johnson,G.I. Zysman +1 more
TL;DR: In this paper, the ABCD parameters of two-port networks composed of two identical, coupled transmission lines embedded in an inhomogeneous dielectric (e.g., suspended substrate, microstrip) are investigated.
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