Research Of X-Band Radial Line Helix Subarray Feed System

Antenna is the terminal of high power microwave system, it is the part of radiation energy to the free space, and its performance affects the performance of high power microwave system. In the research of high power microwave antenna system, the engineers not only study how to implement the system capacity of high power, high gain and high radiation efficiency, also focus on the problem of high power microwave antenna system how to realize miniaturization, light-duty.In recent years, the radial line helix array antenna used successfully in the field of high power microwave technology, this kind of antenna has the advantages of small volume, light weight and high caliber efficiency. The radial line spiral array antenna has been studied in L-band, S-band and C-band by different level, but the X-band high-power radial line helix array antenna’s theoretical analysis, numerical simulation and experimental research has not been studied in detail, so the X-band high-power radial line spiral array antenna subarray research has practical significance. At the same time, solve the technical problems in the research of the subject will be conducive to the radial line spiral array antenna develop to high frequency, and adapted to the rapid development of high power microwave technology.This paper study and summary the basic theory involved in the research on the radial line spiral array antenna firstly. In the mean while, study the existing radial line spiral array antenna in L-band, S-band and C-band, research and know the difficulties of radial line spiral array antenna used in high frequency of X-band may encounter:First of all, the X-band has a high frequency and short wavelength, which caused difficulty in realizing. Secondly, the X-band coupling probe is small which is not easy to guarantee the power capacity of feeding system, so it needs to increase coupling probe to increase power capacity, however, increase probe size may affect the field distribution within the radial line and make it more difficult to the amount of coupling control, need for coupling probes to the optimization design.Study the X-band radial line helix subarray feed system, first to study the performance of the coupling probe in high frequency. This paper carried on the numerical simulation analysis in x-band of the several existing coupling probe, summarizes the probe coupling characteristics and reflection characteristics. On this basis, design and numerical simulation of a center frequency of9.3GHz16unit rectangular radial line subarray feed system, and experiment test the physical model, the correct of design and numerical simulation is verified, implements the X-band radial line helix array antenna. In order to satisfy high gain, large fruit of units of array antenna requirements of X-band subarray, design and numerical simulation of a center frequency of9.3GHz24units rectangular grid subarray, and through experiment verification. Secondly, studied and designed a center frequency of9.3GHz32units of rectangular grid subarray, by improving the internal structure of the feed system method, solved the problem due to the irregular cell layout of uneven distribution of energy. Finally, studied32units triangle grid subarray, by improving and optimizing the design of coupling probes, solved the problem of the large amount of reflection in first lap in X-band triangular lattice grid feed system, finally realizes the front layout asymmetric cases the uniform output of energy.