- Turkish Journal of Electrical Engineering and Computer Science
- Vol: 23 Issue: 5
- Dielectric loaded TEM horn-fed ridged horn antenna designfor ultrawideband ground-penetrating impuls...
Dielectric loaded TEM horn-fed ridged horn antenna designfor ultrawideband ground-penetrating impulse radar
Authors : Ahmet Serdar Türk, Ahmet Kenan Keskin, Mustafa Dağcan Şentürk
Pages : 1479-1488
Doi:10.3906/elk-1303-48
View : 11 | Download : 2
Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :A modified double-ridged horn structure is proposed to obtain ultrawideband antenna characteristics over a bandwidth ratio of greater than 40:1 for impulse radar systems. The Vivaldi-shaped TEM horn feeder has been designed to extend the lower cut-off frequency and the partial dielectric loading technique using a small lens inward while the aperture has been implemented to enhance the gain of the standard double-ridged horn antenna without changing the physical dimensions. The starting frequency of the antenna operation band is lowered from 800 MHz to 400 MHz. Moreover, approximately 5 dB gain increment level is achieved from 4 to 10 GHz. It is shown that proper combination of the partial dielectric loaded TEM and ridged horn antennas can be suitable for multiband ground-penetrating radar operations that provide high resolution imaging at different depths. The antenna gain and input reflection performance measurements are presented with comparisons in both the frequency and time domains.Keywords : Ultrawideband antennas, dielectric loaded TEM horn, double-ridged horn, ground-penetrating radar, impulse radiator