Active GNSS Antenna Implemented with Two-Stage LNA on High Permittivity Substrate

  • Go, Jong-Gyu (Dept. of Electrical and Information Engineering, Seoul Nat'l Univ. of Science and Technology) ;
  • Chung, Jae-Young (Dept. of Electrical and Information Engineering, Seoul Nat'l Univ. of Science and Technology)
  • Received : 2018.01.16
  • Accepted : 2018.02.06
  • Published : 2018.09.01


We propose a small active antenna to receive Global Navigation Satellite System (GNSS) signals, i.e., Global Positioning System (GPS) L1 (1,575MHz) and Russian Global Navigation Satellite System (GLONASS) L1 (1,600 MHz) signals. A two-stage low-noise amplifier (LNA) with more than 27 dB gain is implemented in the bottom layer of a three-layer antenna package. In addition, a hybrid coupler is used to combine signals from pair of proximately coupled orthogonal feeds with $90^{\circ}$ phase difference to achieve the circular polarization (CP) characteristic. Three layers of high permittivity (${\varepsilon}_r=10$) substrates are stacked and effectively integrated to have a small dimension of $64mm{\times}64mm{\times}7.42mm$ (including both circuit and antenna). The reflection coefficient of the fabricated antenna at the target frequency is below -10 dB, the measured antenna gain is above 26 dBic and the measured noise figure is less than 1.4 dB.


Active antenna;Axial ratio;Circularly polarization;Global navigation satellite system;Patch antenna


Supported by : Agency for Defense Development


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