On the Terminal Antennas for Satellite Navigation System and the Microstrip Arrays Conformal to Bomb Shell
|School||Xi'an University of Electronic Science and Technology|
|Course||Electromagnetic Field and Microwave Technology|
|Keywords||Satellite navigation system Satellite terminal antenna Microstrip conformal array Ultra-wideband antenna|
The paper combines scientific research topics of research, satellite navigation system terminal antenna and missile-borne microstrip conformal array design method are discussed, the main research work is divided into three parts: 1. The development of a the Beidou satellite terminal antenna engineering prototype; 2. Simulation Design the Beidou II and GPS_ of dual mode satellite terminal antenna; 3. Developed the bomb contained the engineering prototype of the s-band telemetry conformal array antenna and missile-borne GPs conformal array antenna. The main contents are summarized as follows: First, the Beidou satellite terminal antenna engineering requirements for research background, combined with the four-arm spiral antenna theory, modular printed four-arm spiral antenna structure, designed Beidou satellite terminal antenna . On this basis, there is developed experimental prototype of the combined antenna, and their electrical properties were measured. The measurement results show that the antenna in the transmitting and receiving working band VSWR is less than 1.5, the feeding port isolation greater than 30dB; good circular polarization performance, the axial ratio is less than 3dB; direction FIG half power wave The lobe width up to 120. More, to achieve a wide beam covering the upper half space requirements, to ensure a high gain at low elevation angles. And the measurement results are in good agreement with the simulation results proved the feasibility and effectiveness of this design method. Secondly, according to the technical requirements of the antenna, in the form of the Cross gap coupled microstrip antenna feed, dual-mode satellite terminal antenna design Compass II GPS. In order to effectively suppress multipath straightening the design of a choke, the overall antenna mounted on Chokes above. Designed a splitter, and the wideband signal received by the antenna in order to be divided into two signals. Its AnsoftHFSS software modeling and simulation analysis, simulation results show that the antenna in the Compass II B1, B2, B3 and GPsL1, L2 operating band VSWR less than 1.5, the axial ratio less than 3dB ± 50. The phase center Beamwidth stability of less than 2mm. Therefore, the design of the antenna to meet the technical requirements of the project straight value. Then, on the basis of the microstrip conformal array antenna theory, design the s-band telemetry missile-borne conformal array antenna and the bomb onboard GPS conformal array antenna. Developed experimental prototype of the antenna, and the electric properties were measured. The measurement results show that both conformal array antenna can meet the H-plane omni-directional radiation design requirements. Seen, the proposed design method has some practical value engineering straight. Final research topic of the thesis is the design of ultra-wideband antenna. Developed experimental prototype of the two ultra-wideband planar monopole antenna, and electrical properties were measured. The measurement results show that the two antennas can meet the performance requirements of indoor ultra-wideband wireless communication system terminal antenna.