WIDE-BAND REDUCED-SIZE UNIPLANAR MAGIC-T, HYBRID-RING, AND DE RONDES CPW-SLOT COUPLERS

New reduced-size uniplanar magic-T and hybrid-ring coupler suitable fo r MIC's and MMIC's have been developed using a CPW-slotline ring that is 20% smaller than comparable designs. These circuits provide good am plitude 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 degrees maximum phase imbalance. Also a new uniplanar de Ronde's CP W-slot directional coupler was developed with good performance. The ev en-odd mode analysis of four-port networks with double symmetry was us ed to analyze this coupler. A de Ronde's coupler with 5 dB coupling wa s designed and demonstrated over the frequency range of 2.4-3.4 GHz. T he measurement results agree with the theoretical design.