Development Of Substrate Integrated Waveguide High Gain Antenna

As an important component of the wireless communication system,the antenna directly determines the performance of the system.In the microwave millimeter wave band,the transmission distance is affected by the energy attenuation due to the resistance of air environment,since which the demand for high gain antennas in various industries is increasing.It has been widely noticed by researchers around the world due to its low loss,high power capacity and easy integration of planar structures since the introduction of substrate integrated waveguide(SIW)technology.Therefore,the high gain antenna based on SIW structure currently has direction of research.This paper studied two types of antennas based on SIW,cavity-backed slot antenna and H-plane horn antenna,the main contents are summarized below.1.Studied the radiation mechanism and farfield calculation of the slot antenna,designed six SIW cavity-backed slot antennas,and designed a small array for several antenna elements.First,designed a novel cavity-backed slot liner polarized antenna based on a rectangular SIW resonator with a regular hexagonal slot,analyzed the antenna characteristics and tested the antenna,and tested results verified the correctness of the simulation.Secondly,studied the conversion mechanism from full-mode substrate integrated waveguide(FMSIW)to half-mold substrate integrated waveguide(HMSIW)and quarter-mode integrated substrate integrated waveguide(QMSIW),which reduces antenna size and realizes miniaturization of the antenna.Based on this,a rectangular cavity-backed slot antenna based on a square FMSIW structure,a dual frequency cavity-backed slot antenna unit based on the HMSIW structure and a 1*2 small array,and a dual frequency cavity-backed slot antenna based on the QMSIW structure were designed.The three antennas above are simulated and fabricated,the simulation and test results basically agreed.Thirdly,analyzed the characteristics of hexagonal SIW resonator,designed a cavity-backed slot antenna unit based on a hexagonal SIW structure and a 1*4 small array fed by microstrip power divider network,the gain of array is 4.5d B more than the unite.Finally,a microstrip-fed substrate integrated waveguide cavity-backed slot array antenna,of which the four rectangular slots are evenly arranged on both sides of the cavity center,is designed and the simulation results show that the antenna has a high gain level.2.Studied the radiation mechanism of the H-plane horn antenna,analyzed the basic model of the H-plane horn antenna based on SIW structure,summarized the major drawbacks of the antenna and the corresponding solution and designed two SIW H-plane horn antenna.The performance of first antenna,loaded with dielectric which with tow pieces of metal patches and by the method of adding a narrow gap,which improves the matching performance between the antenna and the air so that non-uniform current distribution better,is extend greatly and the gain of modified antenna is 2d B more than the previous.The second antenna employed the technical means of lattice-like structure printing transition and dielectric lens,which improved poor matching performance of the radiation aperture and non-uniform current distribution,so that the performance of the antenna is increased greatly.