volume | PIER Journals

Abstract

This work codesigns and validates a compact microstrip patch array with a corporate feed for meteorological direct broadcast at 7.5 GHz, comparing 1×4 to 1×64 arrays. Square patches with rounded corners are rotated 45° to suppress modes, reduce coupling, and preserve broadside radiation. The feed network delivers equal amplitude to four ports. A neural network surrogate trained on full-wave samples accelerates exploration of edge length, corner radius, spacing, rotation, and feed-line dimensions while enforcing limits on S₁₁ and coupling. The 1×4 prototype uses Rogers RT Duroid 5880, ε_r 2.2, thickness 0.787 mm, with a substrate size of 120 mm by 75 mm. Photolithography and anechoic measurements confirm a 7.5 GHz center frequency, broadside radiation, peak gain above 14 dBi, and a 450 MHz bandwidth. Scaling to 1×64 shows 3 dB gain per doubling, reduced beamwidth, stable bandwidth, and coupling; sensitivity studies verify robustness.

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Mrs. Paramasivam Jothilakshmi

Mr. Rajendran Mohanasundaram