High selectivity quarter‐wavelength resonator bandpass filter utilizing source‐load coupling

2019 ◽  
Vol 62 (3) ◽  
pp. 1176-1182 ◽  
Author(s):  
Muhammad Sufian Anwar ◽  
Qunsheng Cao ◽  
Syed Ashhad Burney
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Quarter Wavelength

scholarly journals High Selectivity Slot-Coupled Bandpass Filter Using Discriminating Coupling and Source-Load Coupling

2020 ◽  
Vol 10 (19) ◽  
pp. 6807
Author(s):  
Jie Cui ◽  
Haojie Chang ◽  
Renli Zhang
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Second Harmonic ◽  
Center Frequency ◽  
Coupled Line ◽  
Half Wavelength ◽  
Quarter Wavelength ◽  
Coupling Path ◽  
Signal Cancellation ◽  
Line Path

A multilayer bandpass filter with high selectivity is proposed in this letter. Discriminating coupling formed by slot-coupled quarter-wavelength and half-wavelength resonators introduces a zero at 3f0 (f0 is the center frequency) and the second harmonic is also suppressed due to the quarter-wavelength resonators. Owing to multilayer structure, source-load coupling is introduced to improve selectivity. Then an extra coupled line path is added with the same amplitude as the discriminating coupling path while they are out of phase. Thus signal cancellation produces three extra transmission zeros, with the selectivity and suppression performance further improved. To validate the design, a prototype bandpass filter centered at 2.49 GHz with 3 dB fractional bandwidth of 8.1% is fabricated. Both simulated and measured results are in good agreement and show good performance of the proposed bandpass filter.

HIGH SELECTIVITY DUAL-MODE BANDPASS FILTER WITH SOURCE-LOADED COUPLING

2010 ◽  
Vol 18 ◽  
pp. 187-194 ◽  
Author(s):  
Xue-Shun Zhang ◽  
Yong-Jiu Zhao ◽  
Hong-Wei Deng ◽  
Lu Zhang ◽  
Wen Chen
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Dual Mode

Tri‐band superconducting bandpass filter with high selectivity

2013 ◽  
Vol 49 (10) ◽  
pp. 658-659 ◽  
Author(s):  
Yong Heng ◽  
Xubo Guo ◽  
Bisong Cao ◽  
Bin Wei ◽  
Xiaoping Zhang ◽  
...  
Keyword(s):  
High Selectivity ◽  
Bandpass Filter

Compact dual-band bandpass filter using meander short-circuit quarter-wavelength resonators

2011 ◽  
Vol 54 (2) ◽  
pp. 344-346 ◽  
Author(s):  
H. W. Liu ◽  
Z. C. Zhang ◽  
G. W. Wei ◽  
L. Shen ◽  
X. H. Guan
Keyword(s):  
Bandpass Filter ◽  
Short Circuit ◽  
Dual Band ◽  
Quarter Wavelength
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