Title :
A design of lumped-element 3 dB quadrature hybrids
Author :
Ohta, Isao ; Li, Xue-ping ; Kawai, Tadashi ; Kokubo, Yoshihiro
Author_Institution :
Dept. of Electron., Himeji Inst. of Technol., Hyogo, Japan
Abstract :
In this paper, we first describe a general design procedure of a twofold symmetric directional coupler. Next, we design four types of lumped-element quadrature 3 dB hybrids and try to improve the bandwidth of the performance in accordance with the present procedure. As a result, we realize a flat coupling over a fractional bandwidth of about 26 percent. Experimental verification is described also
Keywords :
UHF couplers; linear network synthesis; lumped parameter networks; multiterminal networks; passive networks; 3 dB quadrature hybrids; bandwidth improvement; design procedure; lumped-element hybrids; twofold symmetric directional coupler; Admittance; Bandwidth; Circuit analysis; Coupling circuits; Design engineering; Directional couplers; Equations; Frequency measurement; Matrices; Prototypes;
Conference_Titel :
Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific
Print_ISBN :
962-442-117-X
DOI :
10.1109/APMC.1997.656427
