Patents
Literature
1 results about "Rat-race coupler" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
A rat-race coupler, also known as a hybrid ring coupler, is a type of coupler used in RF and microwave systems. In its simplest form, it is a 3 dB coupler and is thus an alternative to a magic tee. Compared to the magic tee, it has the advantage of being easy to realize in planar technologies such as microstrip and stripline, although waveguide rat races are also practical. Unlike magic tees, a rat-race needs no matching structure to achieve correct operation.
Bidirectional variable gain phase shifter based on asymmetric power distribution
A bidirectional variable gain phase shifter includes: a rat-race coupler configured to distribute an input signal at a predetermined ratio and divide the input signal into first and second distributed signals; a phase inversion switch circuit configured to selectively invert phases of the respective first and second distributed signals; a hybrid coupler configured to receive two signals output from the phase inversion switch circuit, to phase-shift and combine the received signals, and to obtain first and second phase-shifted signals; and a phase selection switch configured to select one of the first and second phase-shifted signals and output the selected signal as an output signal, wherein phase and gain can be accurately adjusted bidirectionally without attenuation, insertion loss is low, and calibration is not required.
Owner:UI (UNIVERSITY IND FOUNDATION) YONSEI UNIVERSITY