Title :
Broadband multisection asymmetric 8.34-dB directional coupler with improved directivity
Author :
Gruszczynski, Slawomir ; Wincza, Krzysztof
Author_Institution :
Dept. of Electron., Wroclaw Univ. of Technol., Wroclaw
Abstract :
The paper presents the design of a broadband 8.34-dB directional coupler in a stripline technique. In order to obtain broadband frequency response a three-section asymmetric coupled-line directional coupler has been chosen. The influence of discontinuities in the regions of coupled and transmission line connections, as well as intersection connections, has been taken into account in the design stage. The parasitic reactances associated with the discontinuities have been compensated using the developed capacitive compensation technique which allows for directional couplers´ design with improved directivity and return loss characteristics. The compensation technique has been for the first time applied for the design of directional couplers with the coupling weaker than 3 dB. The designed coupler has been manufactured and measured to validate the presented compensation technique.
Keywords :
directional couplers; asymmetric coupled-line directional coupler; broadband frequency response; broadband multisection asymmetric directional coupler; capacitive compensation; directional coupler design; intersection connections; parasitic reactances; return loss characteristics; stripline technique; transmission line connections; Acoustics; Antenna measurements; Coupling circuits; Directional couplers; Frequency measurement; Manufacturing; Microwave theory and techniques; Power transmission lines; Transmission line discontinuities; Transmission line measurements; Broadband directional couplers; asymmetric couplers; coupled strip transmission lines; discontinuities; technique of capacitive compensation;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4554768