Title :
A design of microstrip-disk-type directional couplers
Author :
Kawai, Tadashi ; Fukumoto, Takeshi ; Kokubo, Yoshihiro ; Ohta, Isao ; Jui-Pang, Hsu.
Author_Institution :
Dept. of Electron., Himeji Inst. of Technol., Hyogo, Japan
Abstract :
This paper describes a design of microstrip rectangular disk quadrature directional couplers on the basis of a modified eigenfunction expansion method with consideration of frequency dependences of an effective width and an effective relative permittivity of a microstrip disk circuit. Using this approximate method, we can optimize the disk configuration of directional couplers in a reasonable computational time. The validity of the design method is examined by comparison with the numerical results by the FDTD method
Keywords :
eigenvalues and eigenfunctions; finite difference time-domain analysis; microstrip directional couplers; permittivity; FDTD method; approximate method; design method; directional couplers; disk configuration optimisation; effective relative permittivity; frequency dependence; microstrip disk circuit; microstrip-disk-type; modified eigenfunction expansion method; rectangular disk quadrature couplers; Design engineering; Design methodology; Directional couplers; Eigenvalues and eigenfunctions; Finite difference methods; Frequency; Impedance; Magnetic circuits; Microstrip; Permittivity;
Conference_Titel :
Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific
Print_ISBN :
962-442-117-X
DOI :
10.1109/APMC.1997.656509
