Abstract
In this study, a compact dual-band combined loop-slot planar antenna is proposed. (1) Background: multi-function antennas are desired for wireless communication to cover the desired frequency spectrum. (2) Methods: the proposed antenna consists of a semi-rectangular open-ended loop (OEL) operating at the lower frequency band 920 MHz, an open-ended slot (OES) transmission line that provides resonance at the higher band 2.4 GHz, and a feeding port using the asymmetric coplanar strip (ACS) line. The ACS is used to excite the antenna to achieve dual-band performance. The overall dimensions of the fabricated prototype are 32.5 × 53.5 mm2 (0.1λo×0.16λo), where λo represents the free-space wavelength at the lower frequency. (3) Results: from the calculations, the antenna shows two impedance bandwidths (estimated at −10dB) of 30 MHz (920–950 MHz) and 300 MHz (2.2–2.5 GHz) to cover the ISM band (920 MHz) and 2.45 GHz WiFi bands, respectively. Indeed, the antenna has stable radiation patterns and achieves peak measured realized gain of 1.8 dBi in the lower band and 4.2 dBi in the higher band. (4) Conclusion: the antenna shows the merits of low profile structure, single-layer, and low-cost fabrication. The proposed antenna not only achieves incremental increase in radiation efficiency, but also provides a lightweight, and small footprint.
Highlights
With the great advancement in wireless communication technology and personal wireless communications, there is a constant demand for antennas with multi-functions
Multiband antennas that are simultaneously operating at different frequency band are preferred for several practical applications
One of the most critical points concerns the harvesting capability of the RF modules is the design of a compact, simple, dual-band, and lightweight antenna
Summary
With the great advancement in wireless communication technology and personal wireless communications, there is a constant demand for antennas with multi-functions. Multiband antennas that are simultaneously operating at different frequency band are preferred for several practical applications. Wireless mobile services, satellite communication, biomedical diagnosis, and energy harvesting applications [1,2]. The license-free Industrial-Scientific-Medical (ISM) frequency bands located at 0.9, 2.4, and 5.8 GHz are usually exploited to support wireless power transfer (WPT) technology. The RF energy transfer in ISM Bands is promising, but it becomes a reality as some pioneer companies propose several full kits: Powercast Corporation, AnSem, and MicroChip, to name a few [3]. There is still a great demand to make the RF energy transfer an appropriate, low cost and easy-to-use solution to sufficiently powering the remote wireless nodes. One of the most critical points concerns the harvesting capability of the RF modules is the design of a compact, simple, dual-band, and lightweight antenna
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