Characterization and Modeling of Microstrip Transmission Lines with Slow-Wave Effect

2008 ◽  
Author(s):  
T. Masuda ◽  
N. Shiramizu ◽  
T. Nakamura ◽  
K. Washio
Keyword(s):  
Slow Wave ◽  
Transmission Lines ◽  
Wave Effect ◽  
Microstrip Transmission Lines

Miniaturized branch-line coupler based on slow-wave microstrip lines

2018 ◽  
Vol 10 (10) ◽  
pp. 1103-1106 ◽  
Author(s):  
H. Alhalabi ◽  
H. Issa ◽  
E. Pistono ◽  
D. Kaddour ◽  
F. Podevin ◽  
...  
Keyword(s):  
Slow Wave ◽  
Transmission Lines ◽  
Insertion Loss ◽  
Return Loss ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Wave Effect ◽  
Branch Line ◽  
Printed Circuit ◽  
Microstrip Lines

AbstractThis paper presents a miniaturized 3-dB branch-line coupler based on slow-wave microstrip transmission lines. The miniaturized coupler operating at 2.45 GHz is designed and implemented on a double-layer printed circuit board substrate with blind metallic vias embedded in the lower substrate layer providing the slow-wave effect. Based on this concept, a 43% size miniaturization is achieved as compared with a classical microstrip branch-line coupler prototype. The measured S parameters present a return loss of 25.5 dB and an average insertion loss equal to 0.05 dB at the operating frequency.

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