Tri-band and quad-band dual L-slot coupled circularly polarized dielectric resonator antennas

Abstract

In this paper, two Dielectric Resonator Antenna (DRA) models fed through a pair of diagonally coupled asymmetric L‐slots are incorporated on the ground plane of size 44 X 44 mm2 with a strip line feed underneath the substrate are presented. The proposed DRA‐1 is a triband antenna, resonates at 5.2GHz, 6.7GHz and 9.85GHz with a gain of 5.6dBi, 5.66dBi and 9.8dBi respectively. The bandwidth offered at Circularly Polarized (CP) band by DRA‐1 is 1.95 GHz (6‐7.95 GHz). The proposed second model DRA‐2 operates at 5 GHz, 6.4 GHz, 7.8 GHz and 10.3 GHz with a peak gain of 5.5dBi, 5dBi, 6.1dBi and 7.8dBi respectively. The quad‐band DRA‐2 offers two CP bands with bandwidths of 1.3GHz (7‐8.3 GHz) and 1.2 GHz (9.8‐11 GHz). The multiple operating bands of the proposed DRAs are appropriate for different wireless applications such as WLAN, C‐Band and X‐Band range of frequencies.

Wideband circularly polarized concentric cylindrical dielectric resonator antenna excited by helix

“…In the Reference [28], the axial ratio and impedance bandwidth of the antenna is improved by pair of axially symmetric, rectangular curved slots. In the Reference [29], two DRA geometry is fed through a pair of diagonally fed asymmetric coupled L-slots for WLAN, C-band, and X-band frequency. Similarly, in the Reference [30], the analytical derivation of radiation characteristics of dielectric loaded helical antenna is investigated using sheath helix model.…”

Surface Mountable Multiband Dielectric Resonator Antenna for Wireless Communication Systems

“…Hybrid dielectric resonator antennas which employ the method of adding a resonating structure with a dielectric resonator to achieve multiband characteristics are examined in [12][13][14][15][16][17]. CPW and slot coupled fed dielectric resonator antennas to realize multiband characteristic are presented in [18][19][20]. Chaudhary et al proposed a dielectric resonator antenna having permittivity variation in the azimuth direction to achieve multiband characteristics [21].…”

Single-feed circularly polarized rectangular dielectric resonator antenna coupled with dual mode slot-line square ring resonator

“…The fourth is to add metallic strips onto DRAs' side walls [11,12]. And the last is to modify the coupling aperture embedded on the ground plane [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37].…”

“…The aperture-coupling excitation method with a microstrip feed-line has the advantage of having the feed network located below the ground plane, thus avoiding spurious radiation and the advantage of integrating DRAs with printed feed structures [38]. Therefore, this excitation method has usually been used to excite the DRAs [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,39] and the last method of designing a single-feed CP DRA (modifying the coupling aperture embedded on the ground plane) is the most popular one by designers. There are many kinds of modified coupling apertures used to design single-feed CP DRAs.…”

“…The simplest one is to incline the rectangular coupling slot at an angle or off-center it relative to the DRA [13,14,15,16]. The unequal cross slots [17,18,19,20,21,22,23], the open annular slots [24,25,26,27,28,29,30,31] and the ring slots [32,33,34,35,36,37] are the other tree simple coupling apertures to design single-feed CP DRAs. When ring slots are used as the coupling structures, the feeding microstrip line printed on the bottom surface of the substrate usually needs to pass through the ring to form a quasi-dual feeding structure [32,33,34,35,36].…”