Title :
New broad-band 5-section microstrip-line directional coupler
Author :
Nakajima, M. ; Yamashita, E. ; Asa, M.
Author_Institution :
Univ. of Electro-Commun., Tokyo, Japan
Abstract :
A novel 2-18-GHz, 6-dB microstrip-line directional coupler has been realized using three semireentrant tight-coupling sections implemented into five coupling sections formed on Teflon substrate. The measured coupling coefficient of this coupler is in good agreement with theoretical values. The advantages of the semireentrant tight-coupling section are: (1) there is no need for bonding wires of air bridges; (2) the structure is convenient for connecting to other such couplers or to ordinary edge coupling sections; and (3) conventional synthesis techniques based on the concept of the even-mode and odd-mode field and of multisection couplers are applicable.<>
Keywords :
directional couplers; strip line components; 2 to 18 GHz; Teflon substrate; broad-band 5-section microstrip-line directional coupler; coupling coefficient; edge coupling sections; even-mode field; multisection couplers; odd-mode field; semireentrant tight-coupling sections; synthesis techniques; Capacitance; Conductors; Coupling circuits; Directional couplers; Impedance; Integrated circuit measurements; Microstrip; Strips; Transmission line matrix methods; Transmission line measurements;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99600
