Compact slot and dielectric resonator antenna with dual-resonance, broadband characteristics

Abstract

Abstract-The goal of this study is to improve the bandwidth of a miniaturized antenna. The proposed technique combines a slot antenna and a dielectric resonator antenna (DRA) to effectively double the available bandwidth without compromising miniaturization or efficiency. With proper design it is observed that the resonance of the slot and that of the dielectric structure itself may be merged to achieve extremely wide bandwidth over which the antenna polarization and radiation pattern are preserved. In addition, using the DRA, a volumetric source, improves the radiation power factor of the radiating slot. A miniaturized antenna figure of merit (MAFM) is defined to simultaneously quantify aspects of miniaturized antenna performance including the degree of miniaturization, efficiency, and bandwidth. Figures for various common types of antennas are given and compared with that of the proposed structures. In order to determine the effects of varying design parameters on bandwidth and matching, sensitivity analysis is carried out using the finite-difference time-domain method. Numerous designs for miniaturized slot-fed dielectric resonator antennas are simulated and bandwidths exceeding 25% are achieved. Two 2.4 GHz antennas are built, characterized, and the results compared with theory.

Investigation of a Cross-Slot-Coupled Dual-Band Circularly Polarized Hybrid Dielectric Resonator Antenna

“…The resonant frequencies of DRA are not equal to that of the DR and cross-slot because the microstrip feed line has effects on the position of the resonances of the DRA [10]. This provides evidence that the proposed antenna is a dual-band hybrid DRA.…”

“…With the development of wireless communication systems, DRAs with dual-band performance have been widely investigated [3][4][5]. Hybrid DRA [6][7][8][9][10][11][12] technology is a viable candidate for realizing dual-band operation. A direct approach to designing a hybrid DRA is to introduce an extra slot resonator [9].…”

“…A simpler approach to designing a hybrid DRA is to take advantage of the resonance of the feeding structure. In [10], a compact wideband DRA was obtained by merging the resonances of the slot coupled DRA and the DR loaded slot. In [11], an ultra-wideband hybrid antenna was proposed by combining the annular DRA with a monopole that simultaneously acts as a feed structure and a radiator.…”

“…For example, in [10] the dielectric waveguide model (DWM) method [13] is used to calculate the resonant frequency of the DR, and an approximate formula for computing effective permittivity is used to estimate the resonant frequency of the slot. In reality, the DR is placed on a ground plane with a coupling slot, which is not considered in the DWM.…”

Dual-Wideband Monopole Loaded With Split Ring for Wlan Application

“…A dual-band antenna is a key component for such communication systems [3][4][5][6][7][8][9], especially for "universal" applications, where it should be covering the whole 2.4-2.484 GHz and 5.15-5.825 GHz bands for dual-band WLAN. Designs range from those based on branched monopole [3,4], dipole [5,6], or multibranch [7,8] to those based on dielectric resonators. Recently, it has been demonstrated that loading with magnetic resonator can facilitate dual-band operation [9].…”