Design of a Slot-Loaded Low-Profile Dual-Frequency Antenna for Beidou System
A new low-profile dual-band patch antenna for BeiDou system(BDS)applications is designed in this pa-per.The antenna is based on a single-layer patch antenna structure,and a new resonant frequency is introduced through loading"bridge-type"gaps,so that the antenna operates in dual frequency bands(resonant at 1 176 MHz and 1 575 MHz,respectively),realizing coplanar dual-frequency radiation.Meanwhile,four annular gaps are loaded and only one set of feed-ing pins is used for coupled feeding,which contributes to adjust impedance matching while reducing the number of feeding pins and simplifying the feeding network.In addition,"π type"metal branches are installed on the side of the antenna to further optimize impedance matching in high frequency band.The measured results show that the gain of the antenna is greater than 3.5 dBic in both the B1C band and B2a band,and the axial ratio are less than 3 dB in the above frequency bands.The spectrum shows that the developed antenna operates in the B1C and B2a frequency bands of Beidou system,and is expected to be applied to the terminal equipments of Beidou positioning system.
万方数据
维普
