A novel S-band monopulse antenna with four conical helix antennas on a microstrip substrate comparator is designed, fabricated and measured. Conical helix antenna height is 3lambda, and comparator size is 130 mm times 150mm. The bandwidth (SWR < 2dB) of the antenna is 21.3% with an operating frequency range of 2.7GHz-3.35GHz. The maximum gain of the sum pattern is 17.4 dB, and the null depths of the difference pattern are less than -30 dB.
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