Design of a K-band Wideband Circularly Polarized Micro-strip Array Antenna

The electromagnetic environment faced by modern aircraft is becoming more and more complex, and the sensors on the aircraft are subject to more and more interference and threat. The data link formed by the sensor network among several aircraft can effectively improve the data transmission performance and anti-interference ability. Inter-aircraft data link emphasizes high communication rate, large coverage angle domain, small attitude constraint, low interception rate, high anti-interference and high airborne environmental adaptability. Therefore, it is required that inter-machine data link antenna should have the characteristics of high frequency, large bandwidth, high gain of circular polarization, narrow beam, low side lobe, wave velocity scanning, low profile, light weight, etc. In this paper, a double layer micro-strip antenna coupling fed by strip line U /H slot is presented, which has the above advantages. At the same time, a 5x4 array antenna is designed. The test results show that the standing wave bandwidth less than 1.5 is 24% and the overall height is 14mm, which is very suitable for inter-machine networking data link antenna sensor equipment.