| Ultra Wideband(UWB)technology has the advantages of low power consumption,high data rate,and large data capacity.It is widely used in short-distance,broadband indoor wireless communication,point-to-point ultra-high speed communication and so on.The UWB antenna is a key component of the UWB system,and its performance directly affects the UWB system's communication quality.At the same time,in order to avoid the interference of ultra-wideband communication systems such as wireless local area networks(WLAN),ultra-wideband band-notched antennas are used.Although the traditional single-layer dielectric substrate antenna is low in cost,due to its limited space and layout,it has many limitations in miniaturization and notch performance.With the maturation of multilayer dielectric substrate technology,cost and performance have been greatly improved.In recent years,Multilayer ultra-wideband antennas have gradually become a research hotspot.This paper is mainly focused on the research and analysis of multilayer UWB antenna and multilayer UWB band-notched antenna,based on the combination of ultra wideband,MIMO,UWB band-notched theory,a variety of multilayer printed circuit board(PCB)ultra wideband antenna,MIMO antenna,ultra wideband band-notched antenna are designed.The research results of experiment are verified.The main work of this paper is as follows:1.Based on the idea of multiple radiation patches in different frequency bands to realize ultra-wideband,firstly the paper designs a UWB monopole antenna based on a four-layer printed circuit board(PCB).The antenna is fed by microstrip line and there are two patches of different sizes on two different planes of the dielectric substrate.The antenna size is 16×11mm~2.In order to realize the miniaturization of the antenna,a multilayer ultra-wideband monopole antenna with a bandwidth of 3.3~10.7 GHz is designed using the coupling effect of two bent branches located on different dielectric planes,The effective area of the antenna on a dielectric substrate with a size of 25×22mm~2 is only 10×9mm~2.The miniaturized antenna is very easy to integrate into an ultra-wideband circuit board,which is conducive to the miniaturization of the ultra-wideband system circuit board.Finally,based on miniaturized ultra-wideband antenna,a miniaturized ultra-wideband MIMO antenna is designed by isolating branches.The antenna size is only 27×22×1.6 mm ~3.2.Based on the idea of second-order band-stop filter on a multilayer dielectric substrate to realize band-notched ultra-wideband antenna.Two multilayer UWB band-notched antennas are designed on a four-layer printed circuit board.The designed band-notched antennas not only have a high band-edge selectivity,but also the band-notched structure does not affect the surface current distribution of the antenna.The antenna has a good omnidirectional.Using a multi-planar structure of a multilayer dielectric substrate and introducing a resonator to form a second-order band-rejection filter on the basis of a conventional first-order resonator,high band-edge selectivity characteristics is achieved.The first antenna is based on a coupled resonator between the feed-line and the GND.A quarter-wave short-circuit stub is introduced to achieve band-notched characteristics,and a high band-edge selectivity in the band of 5 to 6.1GHz is obtained.The second band-notched UWB antenna introduce coupled open and short-circuit stubs on the basis of an open-loop resonator located above the radiating patch to achieve a high band-edge selectivity with a notch band of 4.9 to 6 GHz. |
PDF Full Text Request