Research On High-gain And High-efficiency Fabry-Perot Resonant Cavity Antenna

High-gain antennas play an important role in applications such as radar,satellite communications and space exploration.In this thesis,Fabry-Perot(F-P)resonant cavity antenna with high gain and high efficiency pencil beam and conical beam is studied for planar structure.The main contents are as follows:Firstly,the design method of F-P resonant cavity antenna is given based on three analytical models of F-P cavity antenna.Two kinds of diameters of F-P antennas with uniform frequency selective surface(FSS)and upper cover plate as partial reflection surface(PRS)are designed.The aperture field distribution and gain deterioration of F-P antenna are analyzed by using the leaky wave model when it deviates from the resonant frequency.It is pointed out that for F-P antenna with uniform upper cover,narrow gain bandwidth is the main reason to increase the practical diameter of the antenna and thus limit the gain.Secondly,a high-gain F-P cavity antenna with non-uniform PRS and non-uniform electrical band gap(EBG)reflective ground is proposed.With the non-uniform PRS and the reflection floor,the attenuation constant ? and phase constant ? are controlled,and the amplitude and phase distribution of the aperture field is improved for the large aperture,so that the high gain and the high efficiency are realized.A circular F-P resonant cavity with a diameter of 6.6? is developed.The simulated gain is 24.6 dBi which corresponds an aperture efficiency of 67.9%.The measured gain is 23.4 dBi,and the corresponding aperture efficiency is 50.9%.Thirdly,the 2 × 2 F-P resonator antenna cavity array is studied to further increase the size of F-P resonator antenna and achieve higher gain under the condition of ensuring efficiency.The influence of the coupling on the near field distribution is analyzed,then the method of using the metal strip to excite the coupling field is put forward to control the mutation of the center field of the array.Therefore,the uniform distribution of the field is realized on the aperture of 8? × 8?,and the high-gain and high-efficiency design is realized.A 2 × 2 F-P resonant cavity antenna array is designed in the Ku band adopts microstrip power distribution feed network,the simulation gain reaches 27.3dBi within an aperture efficiency of 72.2%and the measured gain reaches 25.5dBi within an aperture efficiency of 47.7%.The 2 × 2 F-P resonant cavity antenna array is designed in the Ka band adopts waveguide power divider feeding network,the simulation gain reaches 28.4dBi within an aperture efficiency of 78.0%and the measured gain reaches 25.9dBi within an aperture efficiency of 43.9%.Finally,a horizontal-polarized large-cone-conical beam F-P resonator antenna is studied,which based on the uniform current loop as the feed source.The 45° beam angle conical antenna simulation gain is 8.0dB,the gain variation is less than 0.6dB,the aperture efficiency is 4.0%,and the 3dB beam width is 22.8°.