Low Profile High Efficiency Millimeter Wave Plate Array Antenna

With the rapid development of wireless communication technology,the data rating of communicaiton system continuely improve,relying on the new communication technology.According to Shannon theorem,the maximum capacity of a communication channel depends on frequency bandwidth,channel number and SNR(SNR: Signal Noise Ratio).Therefore,the promotion of communication system data-rate requires a re-allocation of wideband spectrum resources.The working frequency of the Internet of Things terminal equuipments are mainly concentrated in the sub-6 GHz band.There is not enough wideband spectrum sources for high data-rating wireless communicaiton system.Then,high data-rating wireless communication system will be gradually designed in millimeter-wave frequency band(such as Ka,V,E,W,D band).D band(110 GHz ~ 170 GHz),an atmospheric window frequency band,has 60 GHz spectrum resources available for point-to-point wireless communication system.Antenna,as the front-end RF device of wireless communication system,directly affects the performance of the whole system,such as radiation efficiency and effictive gain.Therefore,wideband high efficiency and high gain array antenna is the key RF device of high data-rating wireless communication system.This paper mainly focuses on the research topic of D band plate array with high efficiency and high gain.The research contents of this paper mainly divide into five aspects:1)The design procedure of millimeter-wave array antenna is discussed,involed two parts: feeding network analysis and array antenna analysis.According to the design procedure,analyzes the D band basic feeding network units of rectangular waveguide transmission line,laid the theorytical foundation for designing high gain plate array.The typical structures,consisted of basic feeding network units,are fabracated by MEMS(MEMS: Micro-electromechanical System Technology).The measured datas indicate that MEMS technology is suitable to design D band array antenna.2)Proposed a design solution of low profile wideband high efficiency linear-polarization sub-array antenna.D band wideband high efficiency linear-polarization sub-array is composed of a wideband high efficiency co-polarization sub-array feeding network and a wideband integrated horn,with 28.60% relative frequency bandwidth and the effective gain of more than 15.68 dBi.Finally,a 16 16 elements wideband high gain linear-polarization array antenna is fabracated by MEMS technology.The measured frequency band of D band wideband high gain linear-polarized array antenna is 120.00 GHz ~ 160.00 GHz;the relative frequency bandwidth is 28.60% with more than 31.4 dBi effective gain and greater than 62.10% radiated efficiency.3)Proposed a design solution of wideband high efficiency circular-polarization sub-array antenna.D band high efficiency circular-polarization sub-array is consisted of a wideband high efficiency orthogonal polarization feeding network,a wideband high efficiency complementary phase shifter and a wideband-integrated horn.Its relative frequency bandwidth is about 28.57% with 28.57% axial ratio bandwidth and more than 12.23 dBi effiective gain.Finally,a 16 16 elements wideband high gain circular-polarization array antenna is fabracated by MDBT technology.The measured working frequency of array antenna is 128.00 GHz ~ 149.00 GHz with 15.16% relative frequency bandwidth.The effective gain in working band is above 30.00 dBi with 65.00 % radiated efficiency.The 3 dB axis ratio relative bandwidth is greater than 28.57%.4)Proposed a design solution of wideband high efficiency dual-linear-polarization sub-array antenna.D band wideband high efficiency dual-polarization sub-array is consisted of a wideband high efficiency dual-polarization orthognal-polarization sub-array feeding network and a wide-band integrated horn.Its relative frequency bandwidth is above 14.28% with 14.00 dBi effictive gain.Finally,a 16 16 elements wideband high gain dual-linear-polarization array antenna is fabracated by MDBT technology.The measured working frequency bands are 126.90 GHz ~ 150.22 GHz and 126.90 GHz ~151.25 GHz,with 16.83% and 17.31% relative frequency bands.The measured effictive gain of array antenna is above 27.31 dBi,and the cross-polarization level is less than-33.24 dB and-40.23 dB.5)Proposed a phase-less measured method for millimeter-wave high gain array antenna.It measures performance of array antenna based on the metal plate reflector and the metal dihedral reflector,VNA(VNA: Vector Network Analysis).Single port of VNA measures the reflected signal of reflector to avoid antenna misplace error.Meanwhile,the measured datas do not have directive relation with each other to eliminate different condition error.The phaseless measurement method measures the linear-polarization standard gain horn with 1.39 d Bi effective gain difference between measured data and simulated one,and the corss-polarization level is below than-40 dB.The phaseless measurement method successfully measures the plate array antenna in this article: linear-polarization array,circular-polarization array and dual-linearly polarizaiton array.To sum up,this paper mainly studies the D band wideband plate array antenna and pahseless measurement method.The realization solution of linear-polarization,circular-polarization and dual-linearly polarization sub-arrays are presented.In addition,a modified phaseless measurement method of array antenna is proposed.