Title :
On a lumped element three-branch 3-dB coupler with Butterworth and Chebyshev characteristics
Author :
Sakagami, I. ; Sakaguti, K. ; Fujii, M. ; Tahara, M. ; Hao, Y.
Author_Institution :
Dept. of Electr. & Electron. Eng., Toyama Univ., Japan
Abstract :
Three-branch 3-dB quadrature couplers comprised of one-quarter wavelength transmission lines and their dual circuits comprised of three-quarters wavelength transmission lines are transformed into lumped element circuits using network equivalents to transmission line segments. The frequency characteristics of the lumped element circuits, which are the equivalents of distributed constant branch line couplers with Butterworth and Chebyshev characteristics, are found to be wider in frequency bandwidth and more symmetrical about the center frequency than those presented in previous papers.
Keywords :
coupled circuits; lumped parameter networks; radio receivers; radio transmitters; transmission lines; 3 dB; Butterworth characteristics; Chebyshev characteristics; distributed constant branch line couplers; dual circuits; frequency characteristics; lumped element circuits; one quarter wavelength transmission lines; radio receivers; radio transmitters; three branch quadrature couplers; three quarters wavelength transmission lines; Bandwidth; Capacitors; Chebyshev approximation; Coupling circuits; Distributed parameter circuits; Fabrication; Inductors; RF signals; Radio frequency; Radiofrequency integrated circuits;
Conference_Titel :
Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on
Print_ISBN :
0-7803-8346-X
DOI :
10.1109/MWSCAS.2004.1354281
