Bandpass filters with single transmission zeros at finite frequencies for adjusting slopes of frequency response

2004 ◽  
Author(s):  
M. Zaradny ◽  
S. Gruszczynski
Keyword(s):  
Frequency Response ◽  
Bandpass Filters ◽  
Transmission Zeros

A Simple Compact Microstrip Wideband Bandpass Filter

2013 ◽  
Vol 760-762 ◽  
pp. 236-240
Author(s):  
Jian Kang Xiao ◽  
Wu Zhu ◽  
Yong Li ◽  
Wei Zhao
Keyword(s):  
Bandpass Filter ◽  
Bandpass Filters ◽  
Size Reduction ◽  
Transmission Zeros ◽  
Good Agreement

Two wideband bandpass filters with miniature size and wide stopband are proposed by using cascaded U-shaped resonators. The filters exhibit bandwidths of 31.1% and 28.8% at about 5.3GHz and 5.6GHz, respectively. Both designed filters have simple structures and compact sizes, wide passband, excellent out-band performance with wide lower and upper stopbands, and a pair of transmission zeros on both sides of passband. The new designs have evident circuit size reduction compared with relative reports. A wideband microstrip BPF is fabricated and measured, and the measurement exhibits good agreement with the prediction.

scholarly journals Compact Ultra-Wideband Bandpass Filters Achieved by Using a Stub-Loaded Stepped Impedance Resonator

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 209 ◽  
Author(s):  
Min-Hang Weng ◽  
Fu-Zhong Zheng ◽  
Hong-Zheng Lai ◽  
Shih-Kun Liu
Keyword(s):  
Resonant Mode ◽  
Bandpass Filters ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Transmission Zeros ◽  
Notch Band ◽  
Resonant Modes ◽  
Attenuation Level ◽  
Stepped Impedance Resonator ◽  
5 Ghz

In this paper, we develop a bandpass filter using a stub-loaded stepped impedance resonator (SLSIR) and calculate the even and odd resonant modes of this type of resonator using the input impedance/admittance analysis. In this study, two impedance ratios and two length ratios are operated as the design parameters for controlling the resonant modes of the SLSIR. Several resonant mode variation curves operating three resonant modes with different impedance ratios and two length ratios are developed. By tuning the desired impedance ratios and length ratios of the SLSIRs, compact ultra-wideband (UWB) bandpass filters (BPFs) can be achieved. Two examples of the UWB BPFs are designed in this study. The first example is UWB filter with a wide stopband and the second one is dual UWB BPF, namely, with UWB performance and a notch band. The first filter is designed for a UWB response from 3.1 to 5.26 GHz having a stopband from 5.3 to 11 GHz, with an attenuation level better than 18 dB. The second filter example is a dual UWB BPF with the frequency range from 3.1 to 5 GHz and 6 to 10.1 GHz using two sets of the proposed SLSIR. The measured results have insertion loss of less than 1 dB, and return loss greater than 10 dB. Furthermore, the coupling structures and open stub of the SLSIR also provide several transmission zeros at the skirt of the passbands for improving the passband selectivity.

scholarly journals High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Wei-Qiang Pan ◽  
Xiao-Lan Zhao ◽  
Yao Zhang ◽  
Jin-Xu Xu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Dual Band ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Novel Method ◽  
Good Agreement ◽  
Tunable Bandpass Filter

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method.

Quasi-elliptic evanescent-mode filters using non-resonating mode waveguide cavities

2015 ◽  
Vol 7 (3-4) ◽  
pp. 211-218 ◽  
Author(s):  
Simone Bastioli ◽  
Richard V. Snyder
Keyword(s):  
Insertion Loss ◽  
Bandpass Filters ◽  
Experimental Results ◽  
The Other ◽  
Q Factor ◽  
Evanescent Mode ◽  
High Q ◽  
Transmission Zeros ◽  
Waveguide Cavities ◽  
A New Technique

A new technique to realize quasi-elliptic bandpass filters with extreme close-in rejection is presented in this paper. The basic idea consists of embedding non-resonating mode waveguide cavities within the structure of an evanescent-mode filter. Such a combination of cavities and resonators allows the generation of very close transmission zeros while realizing at the same time relatively wide passbands and stopbands. Both H-plane TE201 mode and E-plane TM110 mode configurations are used as non-resonating mode waveguide cavities. In contrast with the other elliptic evanescent-mode filters using conventional approaches, the insertion loss degradation at the filter cut-off frequencies is minimized thanks to the high-Q factor of the waveguide cavities, whose corresponding poles are located right at the edges of the passband. The experimental results of an evanescent-mode filter having 9.950–11.000 GHz passband and providing more than 45 dB rejection between 11.040 and 11.050 GHz validate the proposed solution.

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