Integrated Microstrip Multiplex Antenna Design

The multiplex system occupies a large proportion of the mainstream communication market.The traditional method is using multiple antennas,which often can not meet the miniaturization and low cost requirements of multiplex systems.In order to solve this problem,multiplex antennas emerge.It can save space,reduce the number of components,and become easy to achieve integration,so it has broad prospects for development.In this thesis,a variety of multiplex antennas are designed based on the principle of several multiplex antennas.The main contents are as follows:1.Firstly,the development history and current research status of multiplex antennas are investigated,and the design methods of multiplex antennas are briefly summarized.Finally,the main contents of this paper are introduced.2.Based on the principle of orthogonal polarization,a C-band duplex antenna was designed by combining the polygonal patch with the multi-layer slot coupling.The problem of lower gain in the high frequency passband and glitches is solved by inserting a loop of pins.The results of simulation and measurement show that the radiation efficiency is up to 95%.3.A C-band hexagonal slot high isolation duplex antenna is designed with the structure of slot antenna,and the isolation degree above 40dB is achieved.On this basis,the filter structure is introduced to further improve the bandwidth selectivity of the antenna.Then the radiation patch is added to the back of the antenna,and the feed port is added to stimulate the new radiation mode,which realized an integrated triplex antenna.4.Based on the multimode principle,the rectangular ring and triangular ring duplex antennas with high isolation are designed respectively.Based on this,a triangular ring duplex antenna with higher isolation is designed.Finally,a triplex antenna is designed on the basis of the triangle ring duplex antenna with higher isolation,which is fed by a slit coupling feed.The results of simulation and measurement show that the isolation of each port is higher than 20dB.