Research on a wide-beam-layered printed antenna for aerocraft telemetry system

A wide-beam linear polarization antenna with circular patch, ring, microstrip line, and electromagnetically coupled patch is presented in this paper. This antenna was used in missile telemetry system. Circular patch is fed by a coaxial probe directly, and the regular patch is excited by the coupling energy. In order to broaden the antenna beamwidth, the ring and regular patch were added to change the distribution of electromagnetic field. Four microstrip lines were used to obtain a wide impedance-matching bandwidth. This antenna is simulated and optimized by using the full wave electromagnetic simulation technique. It can achieve an impedance bandwidth (S11<-10 dB) of 2.36–2.38 GHz. The simulated results showed a linear polarization radiation with a wide half-power beamwidth (>71.9°) and a high radiation gain (>6.2 dB) within the operational bandwidth. The proposed antenna is fabricated and measured. Measured results show that the proposed antenna achieves the expected radiation performance and validates the effectiveness of the dual polarized antenna design. The wide-beam antenna studied in this paper is suitable for missile telemetry system. The research results have laid a technical foundation for its practical engineering application.