A Study Of Conformal Onboard Antenna And Electromagnetic Dipole Antenna

In the next-generation of radio telemetry data link, the miniaturization of conformal onboard remote sensing antenna needs to perform transceiver full-duplex communication function, therefore, miniaturized antenna with high isolation technology is a technical problem of the system. On the other hand, for a long time, the design of directional base station antenna which has the characteristics of high isolation, dual polarization and miniaturization is the key technology of mobile communication base station antenna.Therefore, in view of the above technical problems and key technologies, this thesis studies the patch antenna with high isolation design technology. Including(1) In view of the missile data link need the antenna which has high isolation between transmitting and receiving. This thesis proposes a new structure of multiport conformal onboard antenna, the antenna embedded in the metal missile outer surface effectively, at the same time, it is able to integrate with miniaturized filter on the high density, and combining with the antenna’s unique multiple ports structural characteristics, implement the missile’s pattern and radiation efficiency. The simulation and measured results show that the antenna transmitting center frequency is 2.295 GHz and receiving center frequency is 2.205 GHz, and their isolation is 60 dB.(2) Base on electric dipole resonant and magnetic dipole resonant energy complementary principle, this thesis designs a new type of low profile electromagnetic dipole structure, the structure can achieve ? 45° dual linear polarization, has the stable 3dB beamwidth and excellent pattern conformal ability. On this basis, designed a kind of differential feed network to match the above electromagnetic dipolestructure. The simulation and measured results show that the antenna can work from 2.5GHz to 2.65 GHz, its gain is better than 6.5dBi, the isolation is better than 25 dB, and 3dB beamwidth is about 65°.