Dielectric loaded TEM horn-fed ridged horn antenna designfor ultrawideband ground-penetrating impulse radar

Authors

AHMET SERDAR TÜRK
AHMET KENAN KESKİN
MUSTAFA DAĞCAN ŞENTÜRK

DOI

10.3906/elk-1303-48

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

First Page

1479

Last Page

1488

Recommended Citation

TÜRK, AHMET SERDAR; KESKİN, AHMET KENAN; and ŞENTÜRK, MUSTAFA DAĞCAN (2015) "Dielectric loaded TEM horn-fed ridged horn antenna designfor ultrawideband ground-penetrating impulse radar," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 23: No. 5, Article 21. https://doi.org/10.3906/elk-1303-48
Available at: https://journals.tubitak.gov.tr/elektrik/vol23/iss5/21