Conference Proceeding

A design of single and multi-section microstrip directional coupler with the high directivity

RRC for Wireless Commun. Devices, Soonchunhyang Univ., Chungnam, South Korea
IEEE MTT-S International Microwave Symposium digest. IEEE MTT-S International Microwave Symposium 07/2004; DOI:10.1109/MWSYM.2004.1338978 pp.1895 - 1898 Vol.3 In proceeding of: Microwave Symposium Digest, 2004 IEEE MTT-S International, Volume: 3
Source: IEEE Xplore

ABSTRACT In this paper, single and two-section microstrip directional couplers are implemented for realizing the high-directivity characteristics. The achievement of the high-directivity with microstrip configuration is carried out by the distributed capacitor to decrease the even and odd mode phase difference. Capacitive compensation is performed by gap coupling of open stub formed in sub-coupled line. Therefore, insertion loss and power handling capability are not affected by the gap coupling. The proposed structure is easy to fabricate and incorporate another microwave device due to planner microstrip. We designed and fabricated single and two-section directional coupler with 20 dB coupling. In spite of microstrip structure, the capacitive compensation structure shows the 30 dB (1.6 GHz-2 GHz range) and 26 dB (1 GHz-2.5 GHz) of directivity in single and two-section directional couplers, respectively. Experimental results show a good performance with excellent directivity characteristics.

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Keywords

20 dB coupling
 
directivity
 
distributed capacitor
 
excellent directivity characteristics
 
Experimental results
 
gap coupling
 
GHz-2 GHz range
 
good performance
 
high-directivity
 
high-directivity characteristics
 
insertion loss
 
microstrip configuration
 
microstrip structure
 
odd mode phase difference
 
open stub
 
planner microstrip
 
proposed structure
 
two-section directional coupler
 
two-section directional couplers
 
two-section microstrip directional couplers
 

Chul-Soo Kim