On The Conformal Array Antenna And Required-beam Array Antenna

The research works of this thesis are made with scientific projects. The designmethods of conformal array antennas in the Ka-band, the L-band and required-beamarray antenna in the S-band are discussed in this dissertation. The major works donecan be divided into three parts: At first, the design method of conformal array antennain the Ka-band is introduced in the first part; then cone sets of conformal arrayantennas in the GPS L-band and dual-band of the GPS and Glonass cylindricalconformal array antennas are manufactured; finally, required-beam array antenna inthe S-band is made.The main contents could be summarized as follows:Firstly, the project requirements of the conformal array antenna in the Ka-band areillustrated. In order to meet the requirements, the design method of this antennaemploys the traveling-wave structure as the element of this antenna array, whichcombines some characteristics of millimeter-wave microstrip antenna. With thesimulation and analysis of HFSS, the results shows that the radiation pattern of theconformal array antenna is in the shape of funnel, the direction of maximum beam isinto a angle of80degree with the axial direction of the bomb, the gain of it achieves6.4dB and the out of roundness in horizontal plane is less than5dB, so it can meet theproject requirements. Therefore, it can prove that this design method is effective.Secondly, according to the requirements of conformal array antenna in the L-band,GPS L-band and dual-band of the GPS and Glonass cylindrical conformal arrayantennas are respectively designed. The former employs the Square patch in the form ofcorner cutting circular polarization as the element of this array, the latter employs thestructure of a broadband circular polarization to cover the dual-band above using themethod of double-fed. Meanwhile, physical prototypes are made and measured. Themeasured results show that the two kinds of conformal array antennas both meet therequirements of omnidirectional radiation characteristics in H plane.Finally, the design method of required-beam array antenna in the S-band isdevoted. This array antenna employs “E”-shape microstrip patch as the unit of theantenna array, selecting suitable number of units and feed to different units in the rightamplitude and phase, of which the radiation patterns and gain could meet the projectrequirements. Meanwhile, physical prototype is manufactured and measured. The measured results show that the gain of this antenna array could achieve10.2dB and theradiation patterns also can satisfy the demands.