Title :
Wide-band reduced-size uniplanar magic-T, hybrid-ring, and de Ronde´s CPW-slot couplers
Author :
Fan, Lu ; Ho, Chien-Hsun ; Kanamaluru, Sridhar ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
12/1/1995 12:00:00 AM
Abstract :
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
Keywords :
MMIC; coplanar waveguides; directional couplers; distributed parameter networks; microwave integrated circuits; multiport networks; slot line components; transmission line theory; waveguide couplers; 2 to 6 GHz; CPW-slotline ring; MIC application; MMIC application; de Ronde CPW-slot coupler; directional coupler; double symmetry; even-odd mode analysis; four-port networks; hybrid-ring coupler; uniplanar magic-T coupler; wideband reduced-size couplers; Bandwidth; Directional couplers; Distributed parameter circuits; Frequency; Microwave integrated circuits; Power transmission lines; Slotline; Transmission line measurements; Transmission line theory; Wideband;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
