Compact GNSS Metasurface-Inspired Cavity Antennas

Abstract

This paper presents an innovative circularlypolarized compact cavity antenna based on metasurfaces; the proposed design is explained starting from a linearly-polarized antenna based on similar concepts. The main objective is to cover three different GNSS systems, namely Galileo E1, GLONASS G1 and GPS L1, with a single antenna embedded in a metallic cavity. The aperture dimension is set to 0.26λ0×0.26λ0, with a central frequency of 1578 MHz. Loading the aperture with a metasurface allows an efficient radiation within such a small aperture size. Our experimental results are in very good agreement with the simulations, with an axial ratio lower than 2 dB between 1540 MHz and 1655 MHz.

Quadri-Cluster Broadband Circularly-Polarized Sequentially-Rotated Metasurface-Based Antenna Array for C-Band Satellite Communications

“…3 3,4), respectively and the phase difference of Sparameters between output ports. In Figure 4(a), the |S 11 | of the input port was far below -10 dB over 4 -9.2 GHz, while those of the output ports were between -5 dB and -10 dB over 4 -9 GHz.…”

Circularly polarized global navigation satellite systems metasurface antennas in sub-wavelength metallic cavities

“…In this context, it has been demonstrated previously that the use of metasurfaces allows enlarging the bandwidth (BW) of antennas embedded in such small cavities [3, 4]. More precisely, several GNSS metasurface-inspired antennas in cavities have been studied both in linear [5] and circular [6] polarization. Similar geometries are also well detailed in the open literature under the acronym ARMA but with larger structures, typically of 0.5 λ 0 ; in [7], a small ARMA element was reduced to 0.31 λ .…”

“…Similar geometries are also well detailed in the open literature under the acronym ARMA but with larger structures, typically of 0.5 λ 0 ; in [7], a small ARMA element was reduced to 0.31 λ . In [6], operation in CP has been achieved using four feed points and sequential rotation; this antenna system (whose size is the same as the one selected here, namely 50 × 50 × 20 mm 3 ), exhibits an excellent axial ratio (AR) over a frequency band covering the L1 (GPS), E1 (Galileo); B1 (Beidoo), and G1 (Glonass) GNSS bands, i.e. from 1559 to 1610 MHz.…”

“…We propose in the section “Structure with four feed points and a partial intermediate ground plane for upper and lower band coverage” an alternative evolution of the structure [6], which is able to cover entirely the lower and upper GNSS bands ([1164;1300] MHz and [1559;1610] MHz). To reach a dual-band response with this antenna, an additional partial ground plane is added in the middle of the cavity.…”

Design of triple‐band dual‐sense shared aperture circular polarized antenna for multimode BeiDou communication and navigation integration

“…To obtain dual-or multi-mode navigation, wideband or multi-band circular polarized (CP) antennas have been reported. For example, the crossed-dipole structure, 1 monopole structure, 2 wideband feed network, 3,4 meta-surface, 5 spiral-slot structure, 6 and coupling feed technology 7 are separately proposed for realizing wideband operation. While stacked structure, [8][9][10] frequency-reconfigurable technology, 11 and two-element conformal structure 12,13 are often investigated to cover multi-frequency bands for compatible with different navigation systems.…”