Efficient and Compact Near-Field Coupled Hybrid Antenna Using a Single Radiating Subwavelength Split-Ring Resonator

Electronics

卷:8

Zinching Dang¹  Marco Rahm¹ 

[1] Department of Electrical and Computer Engineering and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany;

关键词: antenna;    hybrid antenna;    near-field-coupled antenna;    near-field resonant parasitic;    subwavelength radiator;   

DOI  :  10.3390/electronics8050527

来源: DOAJ

【 摘 要 】

Modern applications in the realms of wireless communication and mobile broadband Internet increase the demand for compact antennas with well defined directivity. Here, we present an approach for the design and implementation of hybrid antennas consisting of a classic feeding antenna that is near-field-coupled to a subwavelength resonator. In such a combined structure, the composite antenna always radiates at the resonance frequency of the subwavelength oscillator as well as at the resonance frequency of the feeding antenna. While the classic antenna serves as impedance-matched feeding element, the subwavelength resonator induces an additional resonance to the composite antenna. In general, these near-field coupled structures are known for decades and are lately published as near-field resonant parasitic antennas. We describe an antenna design consisting of a high-frequency electric dipole antenna at $f_{\mathrm{d}}=25$ GHz that couples to a low-frequency subwavelength split-ring resonator, which emits electromagnetic waves at $f_{\mathrm{SRR}}=10.41$ GHz. The radiating part of the antenna has a size of approximately $3.2\mathrm{mm}\times 8\mathrm{mm}\times 1\mathrm{mm}$ and thus is electrically small at this frequency with a product $k·a=0.5$ . The input return loss of the antenna was moderate at $-18$ dB and it radiated at a spectral bandwidth of $120$ MHz. The measured main lobe of the antenna was observed at ${60}^{\circ }$ with a $-3$ dB angular width of ${65}^{\circ }$ in the E-plane and at ${130}^{\circ }$ with a $-3$ dB angular width of ${145}^{\circ }$ in the H-plane.

【 授权许可】

Unknown