Abstract
AbstractA method to improve the directivity of the microstrip coupler is presented. The pattern of the coupler is modified for phase velocity compensation, which results in high directivity. Using this procedure, two 15 dB couplers are designed and fabricated at 0.9 GHz. A high directivity of 35 dB and 39 dB are measured. The validity of the design concept is verified by simulations and measurements.
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