A Novel High Directive Willis-Sinha Tapered Slot Antenna for GPR Application in Detecting Landmine

Abstract

Abstract-A novel Ultra-wideband Willis-Sinha Tapered Slot antenna for landmine detection using Ground Penetrating Radar (GPR) system with enhanced gain and directivity is presented. The structure is constructed on a 235 × 270 mm 2 FR4 dielectric substrate. The antenna is fed by a novel tapered coplanar waveguide (CPW) to coplanar stripline (CPS) transition feed. The antenna's impedance bandwidth is extended by adding an antenna arm constructing parabola shape with the antenna element. The antenna has a corrugated structure along the antenna outer edges to improve radiation efficiency and get higher directivity. Also, a mushroom-like circular EBG structure is used in the lower side of the antenna arm to reduce interference and enhance front-to-back ratio (F/B ratio). A partial substrate removal, like circular cylinders inside the substrate, is aligned with the antenna tapered profile to obtain better radiation efficiency and enhance antenna gain. The operational bandwidth of this antenna extends from 0.18 to 6.2 GHz. The minimum return loss reaches 60 dB. The average directivity reaches 12.2 dBi while the gain and radiation efficiency are 11.8 dBi and 92%, respectively with gain enhancement of 195% due to using corrugated structure and air cavities. The front-to-back ratio (F/B ratio) is 23 dB. Also, a size reduction of 48% is achieved due to using extended arm. The antenna performance was simulated and measured. Good agreement was found between numerical and experimental results. The proposed antenna is suitable for various ultra-wideband applications especially in landmine detection. The design of the proposed antenna is given in very simple five design steps.

Circularly Polarized UWB Antenna with Question Mark Shaped Patch for GPR Applications

“…The circularly polarized (CP) feature is needed for the GPR antennas since the performances of the GPR systems depend mainly on the reflected waves containing the indications (Takach et al, 2016). In this context, several GPR antennas have been reported in recent literature such as those proposed in (Chaabane & Babouri, 2019;Elsheakh & Abdallah, 2019;Joula et al, 2018;Kundu et al, 2018;Kundu, 2018;Liu et al, 2019;Li et al, 2016;Mohanna et al, 2018;Raza et al, 2020) but only few have CP characteristic like those presented in (Elsaid et al, 2019;Liu et al, 2015;Raychaudhuri et al, 2016, Stillman et al, 2016. Unfortunately, the CP GPR antennas available in the literature have complex structures and/or have enormous voluminous size.…”

Bistatic RCS Control on Slot-sinuous Antenna by Adding 3 and 5 Parasitic Ellipses Openings

“…The demand of military applications for object tracking and recognition has always been a very powerful engine in research and development on radar and microwave imaging applications [1][2][3][4]. The demand on high performance radar systems requirement goes parallel to the objective of the radar itself as invisible as possible to hostile radars.…”

Super UWB Grooved and Corrugated Antenna for GPR Application

“…Unfortunately, most of these antennas are complex or/and have huge size. In Table 2 [15][16][17][18], a comparative analysis is established between the fabricated antenna and some other recent published GPR planar antennas to show its effectiveness for GPR application. It shows that the features and the performances of the fabricated antenna are similar or improved to those of some recent published antennas.…”