Design Investigation of a Laminated Waveguide Fed Multi-Band DRA for Military Applications

Abstract

In this paper a laminated waveguide fed DR Antenna is investigated. It can use for moderate power military applications. Cylindrical DRA is excited by two closely spaced asymmetric longitudinal slots on the broad wall of the laminated cavity are responsible for producing three different frequency bands. Parametric study of slots has been done with the help of commercial software ANSOFT HFSS. All the bands have sharp rejection. The final model of the antenna is simulated, fabricated and experimentally measured. Measured results are in quite accordant with design results. SIW feeding structures have small losses, moderate power handling capacity, low costs, compact sizes and can be seamlessly integrated with planar circuits. At all the bands 9.76 GHz, 10.53 GHz and 11.8 GHz resonant frequency, the antenna shows 56 MHz, 160 MHz, and 250 MHz impedance bandwidth (for VSWR<2) with 6 dB,6.2 dB and 6.8 dB gain respectively. Simulated and measured results reveal outstanding performance with a cross-polar level of 29 dB lower than that of the co-polar level at 9.76 GHz, the cross-polar level of 32 dB lower than that of the co-polar level at 10.53, GHz, and similarly cross-polar level of 30 dB lower than that of the co-polar level at 11.8 GHz.

Recent developments in bandwidth improvement of dielectric resonator antennas

“…Broadly, these approaches can be divided into four categories; firstly, according to the antenna geometry (DR shape/fractal/EBG/metamaterial), secondly, the coupling mechanism (feeding type/aperture shape), thirdly, the DR permittivity, and lastly, according to the excitation of specific mode. From ease of readers' point of view, these techniques are discussed separately for single‐band, dual‐band, and multi‐band,, respectively. Moreover, some other characteristics say radiation/notch…”

“…Hence, for the same purpose, different techniques have been proposed in context to DRA. For easy and smooth classification, literature based on dual‐band and on multi‐band is discussed in this section, respectively.…”

“…Adz et al, have proposed a E‐shaped aperture fed cylindrical DRA for dual band operation at 5 GHz (with conducting strip under DRA) and 2.45 GHz (with metallic top loaded DRA). Kumar et al have reported a laminated wave‐guide fed cylindrical DRA to operate at 9.76, 10.53, and 11.8 GHz with bandwidth 56, 160, and 250 MHz, respectively. Sharma et al, have excited three different modes (HEM 11δ , TM 01δ , and HEM 12δ ) in a cylindrical DRA by means of different feeding techniques resulting multi band operation over 2.5 to 3.02 GHz, 3.76 to 3.86 GHz, and 4.38 to 4.72 GHz.…”

SIW resonator fed horn mounted compact DRA with enhanced gain for multiband applications

“…This technology also allows integration of antennas with active as well as passive components in a solitary substrate. Limited researches based on SIW fed antenna are available in the literature; however, most of the available designs are either bulky or suffering from low gain [5–8]. Thus, the compact antenna with high gain for multiband applications is still very inspiring.…”

“…In our previously published work [5], a technique to achieve the triple band has been demonstrated by using SIW resonator feed DRA. The gain of an antenna element can be increased by using an electromagnetic band gap (EBG) structure, by the loading of metamaterial or by integration of horn reflector.…”