| In recent years,due to the continuous growth of demand for broadband and large-capacity information transmission and satellite communication,microwave and millimeter wave frequency band has become an important frequency band for the research,development and utilization of international electromagnetic wave spectrum resources.Microwave antennas and millimeter wave antennas,which are important parts of microwave systems and millimeter wave systems,play extremely important roles in application.Microstrip antennas have the advantages of small size,light weight,low profile,simple structure and easy integration,so they are widely used in microwave and millimeter wave systems such as satellite communication systems,radar systems and phased array antenna systems.In addition,Low Temperature Co-fired Ceramic(LTCC)technology which could realize multilayer fabrication has been gradually applied to the millimeter wave frequency band,making the multilayer microwave and millimeter wave microstrip antenna arrays be much more widely utilized.In this paper,research related to microwave and millimeter wave microstrip antenna arrays based on multilayer structure has beed carried out,mainly including the following parts:1.Design of Ka-band slot-coupled microstrip antenna arrays based on PCB and LTCCIn this paper,three 8×8 Ka-band slot-coupled microstrip antenna arrays based on PCB and LTCC technology have been designed.For the antenna array based on PCB technology,the antenna unit is designed utilizing a bowtie-shaped patch with a H-shaped slot,and the array has been fabricated and measured.The measured gain bandwidth of this antenna array is35.9GHz?38GHz.It could realize 20 d Bi at 36.5GHz,and its side lobe level is-13.7d B.For the antenna arrays based on LTCC technology,the antenna units are designed utilizing a rectangular patch with a H-shaped slot and a rectangular patch with an hourglass-shaped slot respectively,and the latter one is selected for fabrication.Its measured gain is 16 d Bi at 35 GHz,and the side lobe level is-11.25 d B.Considering the loss of transmission lines,the loss of transition structures,the loss of bonding wires and the loss of SMA connecters,the measured results and simulated results of the two fabricated antenna arrays agree well,which provides the verication of the integrated design of millimeter wave phased array antennas.2.Design of a Ku-band dual-band dual-polarized microstrip antenna array based on PCBIn this paper,an 8×8 Ku-band dual-band dual-polarized microstrip antenna array based on PCB technology has beed designed,which is based on the background of satellite communication.By adopting a capacitive coupled probe fed structure,a transition structure based on the quasi-coaxial line and a hierarchical design of the feed networks of different polarization modes,the antenna array could realize a relatively great result.The simulated bandwidth of the V-polarized port is 11.25GHz?12.79 GHz.The simulated bandwidth of the Hpolarized port is 12.44GHz?15.27 GHz.The isolation between the two ports is equal or greater than 20 d B.And the cross polarization levels of the E-plane and H-plane at the center frequency could reach-20.1 d B and-20.4 d B respectively in the V polarization mode and H polarization mode.3.Characteristic mode analysis on multilayer microstrip antennaBased on the theory of characteristic mode,a multilayer dual-circularly polarized microstrip antenna has been analyzed in this paper.By chaging different parameters,the resonant frequencies of different modes of the antenna have been modulated independently. |
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