Miniaturization and harmonic suppression of branch-line and rat-race hybrid coupler using compensated spiral compact microstrip resonant cell

2006 ◽  
Author(s):  
Jianzhong Gu ◽  
Xiaowei Sun
Keyword(s):  
Harmonic Suppression ◽  
Branch Line ◽  
Hybrid Coupler

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

Trapezoid-Shaped Resonators to Design Compact Branch Line Coupler with Harmonic Suppression

2021 ◽  
pp. 154032
Author(s):  
Hesam Siahkamari ◽  
Maryam Jahanbakhshi ◽  
Haidar N. Al-Anbagi ◽  
Abdulghafor A. Abdulhameed ◽  
Michal Pokorny ◽  
...  
Keyword(s):  
Harmonic Suppression ◽  
Branch Line

scholarly journals A Defected Ground Structure without Ground Contact Problem and Application to Branch Line Couplers

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jongsik Lim ◽  
Dal Ahn ◽  
Sang-Min Han ◽  
Yongchae Jeong ◽  
Haiwen Liu
Keyword(s):  
Contact Problem ◽  
Microstrip Line ◽  
Ground Plane ◽  
Ground Contact ◽  
Defected Ground Structure ◽  
Critical Problem ◽  
Ground Structure ◽  
Branch Line ◽  
Layered Substrate ◽  
Hybrid Coupler

A new defected ground structure (DGS) microstrip line that is free from the ground contact problem is described together with its application example. The proposed DGS microstrip line adopts a double-layered substrate. The first layer contains the microstrip line and DGS patterns on the top and bottom planes as with the conventional DGS line. The second substrate, of which upper metal plane has already been removed, is attached to the bottom ground plane of the first layer. This structure prevents the ground plane of the first substrate with DGS patterns from making contact with the metal housing. The proposed DGS microstrip line has advantageous transmission and rejection characteristics, without the ground contact problem of DGS patterns, which has been a critical problem of previous DGS lines. A 10 dB branch line hybrid coupler is designed and measured, as an example of application of the proposed DGS microstrip line.

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