Investigation of the methods of improving group delay characteristic using complex transmission zeros for coupled resonators filter

2012 ◽  
Author(s):  
Koichi Murasawa ◽  
Toshikazu Sekine ◽  
Yasuhiro Takahashi
Keyword(s):  
Group Delay ◽  
Coupled Resonators ◽  
Transmission Zeros ◽  
Complex Transmission

scholarly journals Design and Analysis of a Wide Stopband Microstrip Dual-band Bandpass Filter

2021 ◽  
Vol 9 (2) ◽  
pp. 83-90
Author(s):  
Salah I. Yahya ◽  
Abbas Rezaei ◽  
Yazen A. Khaleel
Keyword(s):  
Bandpass Filter ◽  
Design Method ◽  
Dual Band ◽  
Equivalent Model ◽  
Harmonic Suppression ◽  
Coupled Resonators ◽  
Transmission Zeros ◽  
Novel Structure ◽  
Compact Size ◽  
Coupled Lines

A novel configuration of a dual-band bandpass filter (BPF) working as a harmonic attenuator is introduced and fabricated. The proposed filter operates at 3 GHz, for UHF and SHF applications, and 6.3 GHz, for wireless applications. The presented layout has a symmetric structure, which consists of coupled resonators. The designing of the proposed resonator is performed by introducing a new LC equivalent model of coupled lines. To verify the LC model of the coupled lines, the lumped elements are calculated. The introduced filter has a wide stopband up to 85 GHz with 28th harmonic suppression, for the first channel, and 13th harmonic suppression, for the second channel. The harmonics are attenuated using a novel structure. Also, the proposed BPF has a compact size of 0.056 λg2. Having several transmission zeros (TZs) that improve the performance of the presented BPF is another feature. The proposed dual-band BPF is fabricated and measured to verify the design method, where the measurement results confirm the simulations.

Design of In-Line Filters With Transmission Zeros Using Strongly Coupled Resonators Pairs

2018 ◽  
Vol 66 (8) ◽  
pp. 3836-3846 ◽  
Author(s):  
Giuseppe Macchiarella ◽  
Simone Bastioli ◽  
Richard V. Snyder
Keyword(s):  
Coupled Resonators ◽  
Strongly Coupled ◽  
Transmission Zeros
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