Miniaturization Of Broadband Research Of Millimeter Wave Planar Antenna

Microstrip antennas have been given widely attentions and also in widespread usedue to their inherent advantages such as small size, light weight, low cost and esayintergration etc. What’s more, millimeter wave system has shorter working wavelengths,high accuracy, good resolution, less susceptible to electronic interference and betterpenetration of cloud, fog and dust. All these characteristics are requried to all kinds ofprecision-guided weapons and vehicles, also can be well applied both in military use asmillimeter wave radar, satellite communications, electronics information, electronicinterference etc, and civil use such as radio astronomy, civilian communications, remotesensing technology, biological effect. Therefore, millimeter microstrip antenna hascaught more and more attentions from antenna researchers. However, the respectivenarrow bandwidth is always one of the microstrip antenna’s inherent disadvantages.Thus, to widen the bandwidth and minimize the dimension has great practicability andgood research prospects and use value in the proceeding of plane milliwave mircrostripantennas design.In this dissertation, accoring to how to widen the bandwidth of the miniaturizationplane millimeter microstrip antenna and antenna array, the detailed work includes:1. Introduced the basic theory of the microstrip antenna, recalled the classicanalysis method (transmission line model, the cavity mode, the finite element method),briefly represented anlysis methods of the antenna array such as Fourier series methodand polynomial interpolation method and elaborated the Duelfer Chebyshev synthesisand Taylor synthesi methods.2. Three kinds of commonly used millimeter antennas form (rectangular patch,elliptical patch, slot antenna) and two kinds of aperture-coupled antennas form(common slot aperture-coupled, H slot aperture-coupled) have been designed andsimulated at the frequency of35GHz with the assistance of Ansoft HFSS13.0. Thethickness of the substrate, length and width of the patch, the feed location, the size andposition of the gap are the mainly concerned structure parameters. According to the simulation results, it made a comparison among those antennas’ size, resonant frequency,bandwidth, return loss, antenna gain and antenna radiation pattern.3. A1-8unequal power divider has been developed. Based on this power divider,three kinds of8units antenna arrays (patch planar antenna array and a common groove,the H slot aperture-coupled patch planar antenna array) have been modelled andsimulated by HFSS13.0. What’s more, three antenna array’s resonant frequency,bandwidth, return loss, gain, sidelobe suppression ratio have been analyzied.4. According above simulation results,5kinds of antenna unit and3kinds ofantenna array have been fabricated and tested as well. As the result, the testing resultaccords with design purpose. Typical bandwidth of the ordinary microstrip elementantenna about2%-4%, while the aperture-coupled microstrip antenna bandwidth couldreach20%, so it obviously exceeds the ordinary microstrip antenna. So it was the8yuan aperture-coupled antenna. Its bandwidth is14.9%much wider than the bandwidthof the ordinary microstrip antenna array which was4%. Of course, there are still somedeficiencies with the design and research, then, some improvement measures putforward. The theoretical analysis and experimental work of millimeter microstripantennas in this paper lay a solid foundation for the following study.