Novel single-fed broadband circularly polarized antenna for GNSS applications

Abstract

This letter presents the design of a broadband microstrip CP antenna using single‐fed technique. The feeding network is integrated within the coupling feed patch to simplify the structure. The proposed antenna is designed for Global Navigation satellite System (GNSS) operating at 1575.42 ± 10.23 MHz (GPS: L1 band), 1559∼1592 MHz (Galileo: E2‐L1‐E1 band), 1602 ± 5.625 MHz (GLONASS: L1 band) and 1559.052∼1591.788 MHz & 1610∼1626.5 MHz (BeiDou Navigation Satellite System B1 and L band). Another advantage of this antenna is the much wider bandwidth in both VSWR and 3 dB axial‐ratio compared with traditional single‐fed CP antennas. Details of design, simulated and experimental results of this CP antenna are presented and discussed. The measured results confirm the validity of this design which meet the requirement of GNSS applications.

A Wideband Circularly Polarized Microstrip Antenna With Multiple Modes

“…For the purpose of broadening the CPBW, a single-layer wideband CP 2×2 patch array with an ARBW of 12.7% is proposed through utilizing a square-loop SP rotated structure in [18]. Similarly, based on this square-loop feeding structure, various of coupled elements are often placed at the edge of the feeding structure to increase the CPBW in [19]- [22], such as circular radiation patch (6.7%) [19], four parasitic rectangular elements (15.9 %) [20], four square driven patches and four parasitic square patches (12.9 %) [21], and an L-shaped parasitic patch (28.1 %) [22].…”

A compact wideband circularly polarized antenna with two pairs of driven patch arrays

“…Circularly polarized (CP) antennas 1‐17 are becoming more popular in satellite and mobile communications, due to the advantages of alleviating polarization mismatch and reducing multipath impacts. In past years, CP microstrip patch antennas (MPA) 3‐17 have been extensively reported due of their excellent features of low cost, low profile and easy integration.…”

“…In past years, sequential rotate technique (SRT) is getting more and more attractive on the design of CP antenna 3‐17 . A 4 × 4 CP slot antenna array is designed by combining SRT with the substrate‐integrated waveguide technique in Reference 3, which obtains 14% axial ratio bandwidth (ARBW).…”

“…It is noticed that the SRT feeding network usually has a complex structure, which is not convenient for antenna systems integration. To reduce the size of the feed network, a sequential phase (SP) feeding technique 6‐14 with single transition line has been massively investigated due to its advantage of magnitude and phase control. In References 6–9, various of different SP feeding structures are designed to directly connect four microstrip patch elements for obtaining wideband CP radiation, such as a sequentially rotated series‐parallel stub (4.8%) 6 and (15.5%), 7 a single‐stage transition SP structure (5.4%), 8 a shorting square‐loop SP structure (7%) 9 and a probe‐excited square‐loop SP feeding structure (12.7%) 10 …”

Single‐layer low‐profile wideband circularly polarized patch antenna surrounded by periodic metallic plates

“…The most common approach is the use of thick substrate with air gap in between the radiator and the ground plane . However, utilizing thick substrate with air gap results in relatively high antenna's profile and the air gap also causes other disadvantage like poor mechanical properties.…”