Abstract
ABSTRACT UWB dual polarization azimuth plane monopulse feed-reflector antenna is presented. Quadridge open ended waveguide working in frequency range from 6 to 12 GHz is proposed as feed for Cassegrain reflector. The feed phase center distance is 0.65 and 1.3 at lowest and highest operating frequency respectively. Sum (Σ) and Diff (Δ) radiation pattern of the feed array are measured in anechoic chamber using same electrical length coaxial cable and 180°Coupler. The results are in good agreement (vertical and horizontal polarizations) with numerical simulation especially for the main beam. To enhance gain value, 50 cm reflector antenna has been used. A proper crossover is achieved by controlling F/D ratio of the equivalent reflector. A compact Cassegrain reflector compatible to feed array is designed and fabricated. The radiation characteristics measurements of the feed-reflector system have been performed using outdoor measurement setup. By ignoring coupler insertion loss, Sum (Diff) gain range is between 24.8 (17) dBi at 6 GHz and 31.7 (29.5) dBi at 12 GHz. Cross pol and null depth better than −31.5 and −24 have been obtained.
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