Broadband Bandpass Filters Using Slotted Resonators Fed by Interdigital Coupled Lines for Improving Upper Stopband Performances

2007 ◽  
Author(s):  
Mongkol Meeloon ◽  
Sarawuth Chaimool ◽  
Prayoot Akkaraekthalin
Keyword(s):  
Bandpass Filters ◽  
Coupled Lines

scholarly journals Corrective Circuits of Bandpass Filters on Coupled Lines

2021 ◽  
pp. 175-181
Author(s):  
R.M. Sharabudinov ◽  
Trinh To Thanh ◽  
N.D. Malyutin ◽  
T.A. Chepko ◽  
G.A. Malyutin ◽  
...  
Keyword(s):  
Bandpass Filters ◽  
Coupled Lines

Ultra-Wideband, Differential-Mode Bandpass Filters with Four Coupled Lines Embedded in Self-Complementary Antennas

2007 ◽  
Vol E90-C (7) ◽  
pp. 1524-1532 ◽  
Author(s):  
A. SAITOU ◽  
K.-P. AHN ◽  
H. AOKI ◽  
K. HONJO ◽  
K. WATANABE
Keyword(s):  
Bandpass Filters ◽  
Ultra Wideband ◽  
Differential Mode ◽  
Coupled Lines

Differential BPFs with Multiple Transmission Zeros Based on Terminated Coupled Lines

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 231-235
Author(s):  
Yiming Niu ◽  
Guo Yang ◽  
Wen Wu
Keyword(s):  
Noise Suppression ◽  
Bandpass Filters ◽  
Differential Mode ◽  
Common Mode ◽  
Multiple Zeros ◽  
Transmission Zeros ◽  
Coupled Lines ◽  
Multiple Transmission ◽  
Good Agreement

AbstractDifferential bandpass filters (BPFs) named Filter A and Filter B based on Terminated Coupled Lines (TCLs) are proposed in this letter. The TCLs contributes to not only three poles in differential-mode (DM) for wideband filtering response but also multiple zeros in both DM and common-mode (CM) offering wide DM out-of-band rejection and good CM suppression. Fabricated filters centred at 3.5 GHz with wide DM passband and wideband CM suppression have been designed and measured. The filters improved the noise suppression capability of the communication and radiometer systems. The simulated and measured results are in good agreement.

scholarly journals Quasi-Reflectionless Microstrip Bandpass Filters With Improved Passband Flatness and Out-of-band Rejection

2020 ◽  
Author(s):  
Xiaohu Wu ◽  
Yingsong Li ◽  
Xiaoguang Liu
Keyword(s):  
Impedance Matching ◽  
Cross Coupling ◽  
Bandpass Filters ◽  
Output Analysis ◽  
Design Concepts ◽  
Frequency Responses ◽  
Transmission Zeros ◽  
Prior Art ◽  
Coupled Lines ◽  
Stopband Attenuation

High-order quasi-reflectionless bandpass filters with improved passband flatness and good impedance matching both in-band and out-of-band are proposed in this work. The proposed design consists of conventional coupled-lines bandpass sections loaded with the presented absorptive stubs at the input and output. Analysis shows that the absorptive stub is equivalent to a 2-pole bandstop filter. Compared to the prior art, the higher-order nature of the presented absorptive stub enables a flatter passband and better out-of-band rejection. The overall filter stopband attenuation can be readily improved by increasing the number of coupled-lines sections without altering the passband responses. Furthermore, cross-coupling between the two absorptive stubs can be used to improve the out-of-band rejection by introducing two transmission zeros without affecting the absorption characteristics. The proposed design concepts are experimentally validated by the design and fabrication of a set of 2.4-GHz 1-, 2-, and 3-pole microstrip quasi-reflectionless bandpass filters. Measured frequency responses of these filters closely match those of the simulation.

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