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A new uniplanar hybrid ring coupler using coplanar waveguide (CPW) and slotline is presented. This new coupler provides substantially improved amplitude and phase characteristics over a broad bandwidth compared with the conventional microstrip hybrid ring couplers. Experimental results show that the new coupler has a bandwidth of approximately one octave from 2 to 4 GHz with ±0.25 dB power dividing balance and ±1° phase balance.
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Ho et al. (1993) studied this question.
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