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Wide-band reduced-size uniplanar magic-T, hybrid-ring, and de Ronde's CPW-slot couplers

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4 Author(s)
Lu Fan ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Ho, C.-H. ; Kanamaluru, S. ; Kai Chang

New reduced-size uniplanar magic-T and hybrid-ring coupler suitable for MIC's and MMIC's have been developed using a CPW-slotline ring that is 20% smaller than comparable designs. These circuits provide good amplitude and phase characteristics over a broad bandwidth. Experimental results show that the hybrid-ring coupler has a 1.3 octave bandwidth centered at 4 GHz and the magic-T has a bandwidth of 1.6 octave from 2-6 GHz. Both have a maximum power dividing imbalance of 0.4 dB and a 2.5° maximum phase imbalance. Also a new uniplanar de Ronde's CPW-slot directional coupler was developed with good performance. The even-odd mode analysis of four-port networks with double symmetry was used to analyze this coupler. A de Ronde's coupler with 5 dB coupling was designed and demonstrated over the frequency range of 2.4-3.4 GHz. The measurement results agree with the theoretical design

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 12 )

Date of Publication:

Dec 1995

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