Compact Dual-Polarized Vivaldi Antenna with High Gain and High Polarization Purity for GPR Applications

Abstract

A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the low-end operating frequency and improve the port isolation with a compact antenna size. The directivity of the antenna is enhanced by the oblique position of the radiators and the implementation of a square loop reflector. Experimental results demonstrate that the antenna has very good impedance matching, port isolation, and dual-polarized radiation performance, with low dispersion characteristics across band of interest from 0.4 GHz to 3.0 GHz. GPR measurements with the designed antenna show that the antenna maintains good detection capability even for objects buried in a highly conductive soil.

A novel mushroom antenna with high gain using three dimensional printing

“…The comparison includes the gain and the size, it is obviously that the proposed antenna has the high‐gain performance, the λ 0 is the wavelength in the free space at the center frequency of the reference antennas. In References [15,19,33], the size of the three antennas are less than the proposed mushroom antenna, however, the maximal gain is just 12.0 dBi. In References [16,18], the size of the back surface are less than the proposed antenna, and the gain of two antenna are just 14.4 dBi, however, the profile are greater than the proposed antenna, and above approximately 50%.…”

“…The high-gain antenna based on railroad communication system is proposed in Reference [18], and the peak gain is 14.4 dBi, however, the profile reached 3.37λ 0 (the λ 0 is the wavelength in the free space at the center frequency). In References [19,20], a compact dual-polarized vivaldi antenna with high gain and highpolarization purity for GPRS applications and a metamaterial covered modified antipodal Vivaldi antenna with lens are proposed, these antennas have the high-gain character as well, however, there are some disadvantages that the areas of undersurface is oversize or the manufacturing is very complex.…”

A Depth-Adaptive Filtering Method for Effective GPR Tree Roots Detection in Tropical Area

“…The SFCW UWB GPR system consists of a computercontrolled Keysight P5008A Vector Network Analyzer (VNA) as a transceiver and two compact dual-polarized Vivaldi antennas [31], as shown in Fig. 6.…”

“…(a) Schematic of the experiment scenario and the view of the real scenario. (b) The two dual-polarized antennas presented in[31] work as the transceiver.…”

Tree Roots Reconstruction Framework for Accurate Positioning in Heterogeneous Soil

“…The GPR system consists of a computer-controlled Keysight P5008A Vector Network Analyzer (VNA) as a transceiver and two compact dual-polarized Vivaldi antennas [52], as shown in Figure 16 coupling between the antennas and environmental noise. The VNA sweeps 1001 frequency points in the frequency band from 0.4 GHz to 3.4 GHz.…”