Research And Analysis Of High-Power Microwave Array Antenna Based On Subarray Technology

With the development of high-power microwave technology and its in-depth application in various fields,all kinds of high-power microwave sources with higher power and higher frequency band came into being.Frequency coverage 1-140GHz and output power can reach more than 10GW,which put forward higher requirements for high-power microwave antenna system.Although various explorations have been made on the high-power microwave antenna in the laboratory,such as wideband,miniaturization,conformal design,reconfigurable design,beam scanning and cost control of the high-power microwave antenna,the most important performance of the high-power microwave system are power capacity and radiation efficiency.As a transmitting antenna,it is necessary to consider how to radiate the high-power microwave efficiently,the existing high-power microwave system still use high-power microwave antennas such as reflector antenna,which have simple structure and high-power capacity.However,with the further promotion of the practicability of high-power microwave system,the disadvantages of large volume,uncompact structure and poor accuracy of this kind of antenna become more and more obvious,which is difficult to adapt to the rapidly changing scene of modern military operations.Based on the subarray technique and resonant cavity slot antenna,this thesis is committed to designing high-power microwave array antenna with low profile,high power capacity and high radiation efficiency.The main research contents are as follows:First,the high-power application of traditional resonant cavity slot antenna is expanded.In this thesis,the effects of the slot structure of the resonator on the performance of the antenna are studied,and based on this,a rectangular aperture linearly polarized resonator slot antenna is designed.The simulation shows that the gain of the antenna at the center frequency is 24.0d Bi,the power capacity in vacuum is140.59MW,and the antenna height is only 34mm（0.373λ₀,λ₀ is the wavelength of the 3.3GHz center frequency in free space）.Second,an S-band slot antenna of slow wave resonator is designed.The metal slow wave structure replaces the dielectric material in the traditional resonator,and solves the problem that the aperture of the resonator does not match the required working frequency,and the antenna still has high power capacity（70.26MW）and low section height（34mm）.Then,the slot antenna of slow wave resonator is extended to C-band,and a C-band low profile high-power array antenna is designed.The simulation results show that at the center frequency,the gain of subarray is 24.49d Bi,the reflection coefficient is less than-20d B,and the power capacity in vacuum is about 363.5MW.Array according to 8×16 arrangement,the theoretical gain of the array is 45.49d Bi and the power capacity is about 363.5MW×8×16=46.52GW,while the profile height of the array antenna is only 1.64λ₀?（λ₀ is the wavelength of C-band center frequency in free space）.Third,combined with the principle of back cavity antenna,the S-band slow wave resonator slot antenna is expanded.After sacrificing a certain section height,the aperture efficiency of slow wave resonator slot antenna is improved from 88.3%to99.7%,and compared with the 70.26MW power capacity of slow wave resonator slot antenna,it still has 42.9MW power capacity.