A wide-beam antenna based on missile telemetry system

This paper presents an antenna system with multiple patches and multiple layer substrates for missile telemetry application. The antenna is comprised by a driven microstrip line, which is printed on the bottom layer dielectric substrate, and two parasitic patch radiators which are printed on the upper dielectric substrate. The microstrip line is excited by a coaxial probe directly, and the two parasitic patches are excited by the coupling energy. In order to broaden the beam width of the microstrip antenna, two parasitic patch radiators with different sizes are printed on the upper dielectric substrate. The width of the microstrip line is linearly varied to obtain a wide impedance-matching bandwidth. This antenna is simulated and optimized by using the full wave electromagnetic simulation technique. The simulated results show that the voltage standing wave ratio (VSWR) is less than 1.9 between 2.15GHz and 2.17GHz. At 2.16GHz, the VSWR of port is 1.29 and the 3dB beam widths of radiation patterns at E planes and H planes were more than 89.2 degrees. The proposed antenna is processed and measured. The measured results show that the proposed antenna achieves the expected radiation performance and validates the effectiveness of the antenna design. The antenna scheme studied in this paper is suitable for missile telemetry system. The research results have laid a technical foundation for its practical engineering application.