Size-Reduction of a Dual-Band Circularly Polarized Dielectric Resonator Antennas

Abstract

In this paper, the size reduction of a dual-band circularly polarized (CP) Y-shaped dielectric resonator antenna (YDRA) is performed. Unlike the conventional CP DRAs, the circular polarization in the YDRA is achieved by the combination of linearly varying E-fields in the two arms of unequal length. Therefore, a PEC boundary condition based technique is applied to the long arm of the dielectric resonator (DR). As a result, a 33.18% reduction in the size is achieved after the optimization of the DR for the required frequency bands. A sample of the proposed design is fabricated to perform measurements. From the results, the antenna obtains a wide impedance bandwidth for |S 11 | ≤ −10 dB of 53.5% (2.3-3.98 GHz), 3 dB axial ratios bandwidths (ARBWs) of 4.08% (2.4-2.50 GHz) and 10.91% (3.38-3.77 GHz) with respective peak gains of 4.83 dBic and 4.81 dBic. The attained 3 dB ARBWs entirely cover the WLAN 2.4 GHz and WiMAX 3.5 GHz frequency bands.INDEX TERMS Circular polarization, dielectric resonator antenna (DRA), miniaturization, PEC boundary.

Dual Polarized, Multiband Four-Port Decagon Shaped Flexible MIMO Antenna for Next Generation Wireless Applications

“…Apart from the above CP MIMO antenna design, dielectric resonator (DR) based antennas have also been studied as they can yield a much wider CP bandwidth [18][19][20][21][22][23]. Amid these designs, desirable CP radiations are generated by applying the following techniques, such as the L-type feeding network [18], 45 o truncation of diagonally placed DR element [19] for 5G applications, Y-shaped DR [20] for WLAN and WiMAX, offset feeding and asymmetrical cut [21] for 5 GHz WLAN, alignment of DR material with zero distance [22] for (7.72-8.08 GHz), and parasitic patch with DR element [23] for WiMAX applications. However, it is notable that the DRbased antennas are bulky in construction and exhibit a high profile due to the thickness of DR material.…”

Mutual Coupling Reduction in Closely Spaced MIMO Dielectric Resonator Antenna in H-Plane Using Closed Metallic Loop

“…It was observed that the fundamental mode (T E x 111 ) is the closest mode to the resonance frequency. The calculated quality factor (Q-factor) for the said mode, with and without metallic loop carried out in eigenmode simulation setup [22,23], are 9247 and 11924, respectively. The low Q-factor, obtained in the case of metallic loop, is caused by the additional losses in the strip's copper material.…”