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Proceedings ArticleDOI

Dual-Fed C-DRA Loaded by Modified Circular Patch Antenna

TL;DR: In this paper , a cylindrical-dielectric resonator antenna (C-DRA) loaded by a circular patch for emerging wide-band wireless communications is presented, which achieves a 2 GHz impedance bandwidth (26.64 GHz − 28.69 GHz) centered at 27.6 GHz, with isolation between the two feeding ports better than 25 dB over the operational bandwidth, implying that the antenna can achieve pure diverse polarization (Axial Ratio (AR) less than 0.1 dB).
Abstract: This paper presents a cylindrical-dielectric resonator antenna (C-DRA) loaded by a circular patch for emerging wide-band wireless communications. To generate a polarization diversity pattern, the proposed antenna is fed by two orthogonal aperture-coupled feeding slots. The slots' shape and position were chosen to achieve the best operating bandwidth and isolation between the two feeds. A circular patch with crossed dumbbell-shaped slots was etched to achieve high polarization purity. Ansys EDT full wave simulator was used to design and optimize the proposed antenna. Simulation results demonstrate that the proposed antenna achieves a 2 GHz impedance bandwidth (26.64 GHz – 28.69 GHz) centered at 27.6 GHz, with isolation between the two feeding ports better than 25 dB over the operational bandwidth, implying that the antenna can achieve pure diverse polarization (Axial Ratio (AR) less than 0.1 dB) with total gain more than 6 dB over the operating frequency bandwidth. The proposed antenna is a good building component for the next 5G wireless communications technology as well as Ka-band satellite communications.
References
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Journal ArticleDOI
TL;DR: In this paper, a singly fed wideband circularly polarized (CP) substrate-integrated dielectric resonator antenna (SIDRA) is proposed for millimeter-wave (mm-wave) applications.
Abstract: A singly fed wideband circularly polarized (CP) substrate-integrated dielectric resonator antenna (SIDRA) is proposed for millimeter-wave (mm-wave) applications. The SIDRA consists of an inner cylindrical dielectric resonator (DR), an outer ring DR, and a substrate-integrated waveguide (SIW) cavity. To generate CP fields, a cross-slot formed by two rectangular slots with different lengths is utilized to feed the DRA at its bottom. It has been found that owing to the embedded structure, the fundamental HEM $_{11\delta }$ mode of the inner DR and the higher order HEM $_{12\delta +1}$ mode of the entire DR can be excited simultaneously, at adjacent frequencies. Moreover, owing to the different loading effects of the two feeding slots, the resonance frequencies of the nearly degenerate DR modes excited by the two slots are slightly different from each other. The two nearly degenerate modes lead to the wide impedance and axial ratio (AR) bandwidths of 34.6% and ~30%, respectively. In addition, due to the surrounding SIW cavity, the directivity of the antenna is greatly improved as compared with that of the isolated counterpart, with the maximum gain given by 8.15 dBic.

61 citations

Journal ArticleDOI
01 Jun 2021-Silicon
TL;DR: In this article, an annular dielectric resonator antenna (DRA) is implemented for THz applications, which is loaded with graphene disk for obtaining the tunability in the frequency response.
Abstract: An annular dielectric resonator (DR) antenna (DRA) is implemented for THz applications. A silicon made DR is loaded with graphene disk for obtaining the tunability in the frequency response. The physical parameters of silicon annular DR can be set to obtain the resonance at any frequency in the lower THz band and can be tuned by changing the chemical potential of graphene nano-disk placed at the top of the DR. The response of antenna is preserved after changing the chemical potential of graphene. The higher order hybrid electromagnetic mode is excited in the antenna structure. The proposed research work provides a way to implement the antenna for THz frequency with high gain around 3.8 dBi and radiation efficiency in the range 72 − 75%.

56 citations

Journal ArticleDOI
TL;DR: In this paper, a stacked DRA with high-permittivity dielectric strips layered on low-perceptivity substrate is adopted for bandwidth and gain benefits for satellite applications.
Abstract: A circularly polarized (CP) dielectric resonator antenna (DRA) with wide bandwidth and low axial ratio (AR) values is presented in this communication. The antenna consists of a stacked DRA, and it is fed by a substrate integrated waveguide coupling slot from the bottom. The stacked DRA structure, with high-permittivity dielectric strips layered on low-permittivity substrate, is adopted for bandwidth and gain benefits. Here, a pair of dielectric strips rather than a single one is placed above the coupling slot with 45° inclination for generating good CP radiation, and it is elaborately designed to provide three closely coupled CP modes, constituting a wide operating bandwidth. To facilitate the application in antenna array, a cavity-backed antenna design along with a $2 \times 2$ subarray are further presented. To verify the design, a subarray prototype is developed and tested at Ku-band for satellite applications, showing an impedance bandwidth of 25.1%, a wide 1 dB AR bandwidth of 15.6%, and a peak gain of 15.1 dBi.

41 citations

Journal ArticleDOI
TL;DR: This paper postulates a novel omnidirectional low-profile ultra-wideband (UWB) antenna with features of both low- profile dielectric resonator (DR) and thin planar monopole antenna, where the laminated equilateral triangular DR and the rectangular metal patch monopole are stacked up.
Abstract: This paper postulates a novel omnidirectional low-profile ultra-wideband (UWB) antenna, which is structured by discrete embedded dielectric resonator antenna with features of both low-profile dielectric resonator (DR) and thin planar monopole antenna, where the laminated equilateral triangular DR and the rectangular metal patch monopole are stacked up. This new design can lower the profile of the antenna. Furthermore, the symmetric DR and the monopole structure are able to make the surface currents in some operating modes opposite in phase, together with the characteristics of the coplanar waveguide (CPW) feed structure and the DR, the cross-polarization is reduced effectively. The mode analysis has been done to show how the antenna achieves the UWB. The CPW which can integrate with integrated circuits easily is used to provide the excitation source. The antenna provides consistent omnidirectivity, consistent gain, low cross-polarization, and high-radiation efficiency within the entire operation band. A prototype (dimensions are 17.6 mm $\times33.6$ mm and 1.524 mm thickness) is fabricated and measured. The measurements are well correlated with the simulations.

21 citations