Research And Design Of Filter Antenna Based On Dielectric Resonator And Substrate Integrated Waveguide Technology

With the popular application of massive multiple-input multiple-output technology,the RF devices are designed to be high level of integration,miniaturization,low loss,and multifunction.Simultaneously,to satisfy the urgent demand for large capacity and extremely highdata rate in modern communication system,the working frequency is shifting upward to higher frequency.During above background,much importance should be attached to integration design of antenna and filter so as to reduce the loss caused by cascading antenna and radio frequency front end and increase the integration of system.On the one hand,dielectric resonator antenna(DRA)technology is suitable for designing higher frequency antenna for the characteristic of high radiation efficiency,large power capacity,low loss,high design freedom.On the other hand,substrate integrated waveguide(SIW)technology is commonly applied to design microwave and millimeter-wave(mm-wave)circuit.Therefore,this thesis combines the advantages of the above two technologies and carries out the design and study of higher frequency filtering antenna based on DR and SIW technology.The major contributions of this dissertation are as follows:1.At first,this dissertion investigates the current research status of DRA and filtering DRA in domestic and overseas to specify the the meaning and target of the subject.Then,we summarized the ways of realizing broadband DRA,millimeter DRA and filtering DRA and separately compare the advantages and disadvantes of these ways.What's more,therotical basises of DRA and SIW are particularky introduced to clarify this dissertion's research contents and approaches.2.A wideband DRA with filtering response in X-band is realized.In the beginning,a SIW cavity is used to feed DR by the way of aperture coupling based on two-order SIW filter.During,this design,DR functions as not only the last order resonator but also the radiation unit.Moreover,stacked DRA and loaded shorting pins are introduced to extend the bandwidth of antenna.Besides,the frequency selectivity is increased through introducing ??2 parasitic slots among microstrip feeding structure.Finally,measured results demonstrate that the filtering DRA realize high selectivity,24.9% in fractional bandwidth(center frequency is 9.77 GHz)and more than 5.5 d Bi in in-band gain.3.Two mm-wave filtering DRA schemes are proposed.Firstly,slot coupling is introduced in SIW to propose an approach of desining flexible and controllable single/dual-band two-order filter by means of adjusting the parallel slots on the upper surface of resonator cavity.Based on this design procedure,we propose a new approach of designing mm-wave filtering DRA in which the last order resonator of SIW filter is replaced by aperture coupling DRA.Meanwhile,the high permittivity dielectric material is loaded on DRA to further extend impedance bandwidth.For more conveniently extending bandwidth,this desertion proposes a way of designing mm-wave filtering antenna based on three-order SIW filter and shorting pins on special position are introduced to increase the selectivity.The reaults show that the two approaches realize well frequency selectivity and satisfy that the VSWR is less than 1.5 during24.75-27.5 GHz(China's mm-wave communication band)and in-band gains are separately more than 5.44 d Bi and 3.74 d Bi.