Abstract
A wideband uniplanar 180-degree hybrid ring coupler implemented in coplanar and slot transmission lines is described. An equivalent circuit of the device is developed. The device is analyzed on a computer and its characteristics are optimized. Experimental results show that the inphase and antiphase power division losses are 20 dB over frequency bands ranging from 4 to 12 GHz. The measured characteristics are in good agreement with the calculated ones.
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