Abstract
A compact quasi-Yagi antenna with bent arms and split-ring resonators (SRRs) is proposed. Compared with traditional quasi-Yagi antennas employing straight arms, the resonant frequency of the proposed antenna could be always consistent with its center frequency, and there is no obvious frequency shift under the process of its miniaturization. The SRRs are adopted in the proposed compact antenna for a high gain of 6.58 dBi. The reliability verification of the proposed antenna radiation characteristics is further experimentally proved with the prototype measurement. The proposed quasi-Yagi antenna has an adjustable compact structure and low frequency offset and could be used in the precise point-to-point wireless communication environment.
Highlights
As a classic directive antenna, Yagi-Uda has been widely used in many fields, such as RFID, WLAN, MIMO system, wireless energy harvesting, and IOT [1,2,3,4,5]
A traditional quasi-Yagi antenna consists of a dipole as a driven element, a reflector to cancel the back radiation, and one or more directors as parasitic elements to realize the end-fire radiation. e characteristics of the traditional quasi-Yagi antenna are decided by the proper amplitude and phase condition between its constituent elements. erefore, a traditional quasi-Yagi antenna always has a large physical dimension for achieving a high gain at the S-band
In 2015 and 2017, a miniaturized quasi-Yagi antenna with fold dipole [10] and a compact printed YagiUda with a hairpin-shaped meandered driven element [11] were proposed for RFID
Summary
As a classic directive antenna, Yagi-Uda has been widely used in many fields, such as RFID, WLAN, MIMO system, wireless energy harvesting, and IOT [1,2,3,4,5]. For expanding the bandwidth and improving the gain of the Yagi antenna, different feed networks, baluns, exciters, and director structures design have been proposed [6,7,8,9]. In 2015 and 2017, a miniaturized quasi-Yagi antenna with fold dipole [10] and a compact printed YagiUda with a hairpin-shaped meandered driven element [11] were proposed for RFID. Unlike the existing arc-shaped hairpin line [17] for gain enhancement and arrow-shaped line for broadening bandwidth [18], in this article, a compact quasi-Yagi antenna with bent-shaped arms of drivers and directors has been proposed, and there is no obvious frequency shift under the process of its miniaturization. If the frequency deviation range of an antenna exceeds 80 MHz in abovementioned application fields, it will cause unpredictable electromagnetic compatibility problems in the whole communication system
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