Abstract
A compact hybrid-mode antenna is proposed for sub-6 GHz communication. The proposed antenna is composed of a slotted rectangular patch, a feeding dipole, and a balun. Three modes are sequentially excited in a shared patch to achieve a compact size. A prototype antenna with a major size of 0.48 λ0 × 0.31 λ0 × 0.16 λ0 (λ0 is the wavelength in the free space at the center of the operating frequency band) is fabricated and measured. The measured results demonstrate an impedance bandwidth of 56.87% from 2.97 GHz to 5.33 GHz and an average gain of approximately 8.00 dBi with 1 dB variation in the operating frequency band of 3.0–5.0 GHz. The proposed antenna can be an element for microbase stations in sub-6 GHz communication.
Highlights
With the rapid development of wireless communication systems, the demands for high-speed and low-latency data services have increased exponentially
With a profile of 0.25 λ0 (λ0 is the wavelength in the free space at the center of the operating frequency band), a differentially driven H-slot patch with an L-plate feeding method could generate a third resonance with a wide impedance bandwidth of 115% [13]
At 3.0 GHz, the electric field is mainly concentrated near the patch. e electric field appears near the two ends of the dipole at 3.6 GHz. e electric field can be observed on the slot at 4.8 GHz. erefore, it is obvious that among the operating frequency bands, the lower frequency is determined by the patch mode, the middle frequency is governed by the dipole mode, and the higher frequency is dominated by the slot mode
Summary
With the rapid development of wireless communication systems, the demands for high-speed and low-latency data services have increased exponentially. Ese hybrid-mode antennas have the merits of low profile, broad bandwidth, and stable radiation pattern, but the structures are complicated and costly. With a profile of 0.25 λ0 (λ0 is the wavelength in the free space at the center of the operating frequency band), a differentially driven H-slot patch with an L-plate feeding method could generate a third resonance with a wide impedance bandwidth of 115% [13]. A differentially driven microstrip patch antenna with a bandwidth of approximately 55% and a profile of 0.06 λ0 was proposed by incorporating a resonant mode of the slot into the TM10 and TM12 modes of the patch resonator [14]. Is paper is an extension of a conference paper [15], wherein the three modes of the patch/dipole/slot are sequentially excited and shared in one radiator to achieve a compact size.
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