A compact wideband 1800 hybrid ring coupler using a novel interdigital CPS inverter

This paper proposes a stepped-impedance wideband 180deg hybrid ring coupler with a novel frequency-independent 180deg phase inverter implemented by interdigital coplanar strip (CPS). Simple design equations for stepped-impedance lines and design curves for CPS/interdigital CPS are also presented. Du...

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Bibliographic Details
Main Authors: Chun-Hsiang Chi, Chi-Yang Chang
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Couplings
Equations
Frequency
Impedance
Inverters
Microwave communication
Transmission line matrix methods
Transmission lines
Wideband
Online Access:Request full text
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Summary:This paper proposes a stepped-impedance wideband 180deg hybrid ring coupler with a novel frequency-independent 180deg phase inverter implemented by interdigital coplanar strip (CPS). Simple design equations for stepped-impedance lines and design curves for CPS/interdigital CPS are also presented. Due to the combination of a stepped-impedance structure and an ideal phase inverter, the proposed hybrid achieves size reduction, wide bandwidth, and excellent phase and amplitude performance. The size of this hybrid is about 13% of the conventional one. Experimental results show that this hybrid ring coupler centered at 2 GHz has a 10-dB return loss bandwidth of 97.5% from 0.98 to 2.93 GHz with 0.5 dB amplitude imbalance and 3deg phase imbalance for both out-of-phase and in-phase operation. Its isolation is better than 30 dB from 0.5 to 4 GHz.
DOI:10.1109/EUMC.2007.4405249