Low-profile circularly polarized GNSS antenna

作者：Pimenta M Silva^*; Ferrero F; Staraj R; Ribero J M

来源：Microwave and Optical Technology Letters, 2012, 54(12): 2811-2814.

DOI：10.1002/mop.27175

• global navigation satellite systems antenna
• three-branch-lines hybrid coupler
• dual-band antenna
• slotted patch
• circular polarization

In this article, we present a low-profile and low cost antenna for GPS (L1L2L5), Galileo (E5E1E2), and Glonass (G1G2) standard. This antenna is a dual-feed planar patch antenna with four slots to achieve dual-band operation. The radiating element is fed by a wideband 90 degrees quadrature hybrid coupler to obtain circular polarization on the both bands. The quadrature feeding is achieved using a three-branch-line hybrid coupler. The return loss bandwidth of the system (S11 = -10 dB) is 22% in the lower band and 14% in the upper one. The axial ratio (AR) bandwidth in broadside direction (AR= 3 dB) is 20% in the lower band and 11.3% at the upper one. The antenna gain is 6 and 8.4 dBi in the normal direction at the central frequency of 1.23 and 1.6 GHz, respectively. The total dimensions of the antenna are 170 mm2 with a thickness of 7.524 mm.

• 出版日期2012-12