Ultra-wideband and high gain antipodal tapered slot antenna with planar metamaterial lens

Abstract

To solve the problems of low gain, narrow bandwidth, and poor radiation directivity of conventional ground penetrating radar antenna, this paper proposes an ultra-wideband and high-gain antipodal tapered slot antenna (ATSA) with planar metamaterial lens. As a constituent part of this lens, a new non-resonant metamaterial unit cell is introduced and analyzed by the full-wave simulation tool. The single-layer planar lens composed of the designed unit cells with different sizes is placed in the maximum radiation direction of the ATSA to greatly enhance its radiation capability. The proposed planar lens antenna has a wide impedance bandwidth of 107.4% (2.41–8 GHz) and −3 dB gain bandwidth of 54.5% (4–7 GHz), respectively. The gain increases averagely by 6.0 dB in the whole operating frequency band, and the peck gain reaches 15.4 dBi at 5.5 GHz. And its excellent performance shows a high application prospect in ground penetrating radar and microwave imaging system.

Ultra-Wideband and High-Gain Vivaldi Antenna with Artificial Electromagnetic Materials

“…Formulas ( 5 ) and ( 6 ) can be simultaneously obtained: where m is the number of periods. By substituting the simulated S-parameters into Formula ( 7 ), the effective refractive index of the artificial electromagnetic materials can be obtained [ 21 , 22 ]. Figure 9 shows the simulated S-parameters, as well as the effective permittivity, effective permeability, effective refractive index, and wave impedance of the artificial electromagnetic material.…”

Enhancement of penetration of electromagnetic waves by field focusing applied to GPR detection

“…In terms of hardware design, increasing radar transmission power can partially enhance the target detection capability of GPR; however, it may cause challenges such as system losses and radio-frequency circuit overload [15]. To mitigate these problems, Tong Hao et al introduced a dual-frequency metasurface antireflective matching layer to enhance the target detection capability of GPR, effectively suppressing strong reflective electromagnetic waves at the air-ground interface through impedance matching and improving radar detection performance [16]. Nonetheless, its relative bandwidth remains limited [17].…”