Wideband Branch-Line Couplers With Single-Section Quarter-Wave Transformers for Arbitrary Coupling Levels

2012 ◽  
Vol 22 (1) ◽  
pp. 19-21 ◽  
Author(s):  
Seungku Lee ◽  
Yongshik Lee
Keyword(s):  
Branch Line ◽  
Arbitrary Coupling ◽  
Single Section ◽  
Quarter Wave

scholarly journals GENERALIZED IMPEDANCE-TRANSFORMING DUAL-BAND BRANCH-LINE COUPLERS FOR ARBITRARY COUPLING LEVELS

2013 ◽  
Vol 53 ◽  
pp. 399-415 ◽  
Author(s):  
Qiang Liu ◽  
Yuanan Liu ◽  
Yongle Wu ◽  
Jun-Yu Shen ◽  
Shulan Li ◽  
...  
Keyword(s):  
Dual Band ◽  
Branch Line ◽  
Arbitrary Coupling

scholarly journals Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1828
Author(s):  
Robert Smolarz ◽  
Krzysztof Wincza ◽  
Slawomir Gruszczynski
Keyword(s):  
Chebyshev Polynomial ◽  
Coupling Coefficient ◽  
Center Frequency ◽  
Electrical Parameters ◽  
New Approach ◽  
Branch Line ◽  
Design Procedures ◽  
Arbitrary Coupling

A new approach to the synthesis of broadband branch-line couplers with arbitrary coupling level was investigated in this paper. It was shown that the operational bandwidth of a classic branch-line coupler can be increased by utilizing N-section impedance transformers added to each of the coupler’s ports. Furthermore, the obtained response can be approximated by the Chebyshev polynomial. Moreover, it was proven that for such couplers a range of coupling coefficient values can be obtained by the modification of classic branch-line topology. The analysis of the electrical parameters of the proposed branch-line couplers was comprehensively investigated. To verify the correctness of the proposed design procedures, 3-dB, and 6-dB broadband branch-line couplers operating at the center frequency of 2 GHz having return losses greater than 20 dB were designed, fabricated, and measured.

Novel Miniaturized Harmonic Suppression Branch-Line Coupler Using Artificial Transmission Lines for UHF Applications

2011 ◽  
Vol E94-C (7) ◽  
pp. 1237-1239
Author(s):  
Chia-Hao KU ◽  
Hsien-Wen LIU ◽  
Yu-Shu LIN ◽  
Kuei-Yi LIN ◽  
Pao-Jen WANG
Keyword(s):  
Transmission Lines ◽  
Harmonic Suppression ◽  
Branch Line
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