Abstract
In order to incorporate different communication standards into a single device, a compact quad-band slot antenna is proposed in this paper. The proposed antenna is composed of a dielectric substrate, T-shaped microstrip patch with a circle slot and an inverted L-slot, and a comb-shaped ground on the back of the substrate. By adopting these structures, it can produce four different bands, while maintaining a small size and a simple structure. Furthermore, a prototype of the quad-band antenna is designed and fabricated. The simulated and measured results show that the proposed antenna can operate over the 1.79–2.63 GHz, 3.46–3.97 GHz, 4.92–5.85 GHz, and 7.87–8.40 GHz, which can cover entire PCS (Personal Communications Service, 1.85–1.99 GHz), UMTS (Universal Mobile Telecommunications System, 1.92–2.17 GHz), WCDMA (wideband code-division multiple access, 2.1 GHz), Bluetooth (2.4–2.48 GHz), WiBro (Wireless Broad band access service, 2.3–3.39 GHz), WLAN (Wireless Local Area Networks, 2.4/5.2/5.8 GHz), WiMAX (Worldwide Interoperability for Microwave Access, 2.5/3.5/5.5 GHz), and X-band SATcom applications (7.9~8.4 GHz). The proposed antenna is particularly attractive for mobile devices integrating multiple communication systems.
Highlights
Modern wireless communication devices are often required to integrate multiple standards and services, operating at different frequency bands, into a single portable handset [1]
It is highly desirable to design multiband antennas to meet the needs of multiple communication standards
The discrepancy between the simulated and measured results could be mainly due to errors in processing and effect of the SMA connector. It can be concluded from return loss results that the proposed design has a good quad-band property which covers entire PCS, WCDMA, WLAN, WiMAX, and X-band SATcom applications
Summary
Modern wireless communication devices are often required to integrate multiple standards and services, operating at different frequency bands, into a single portable handset [1]. For PCS, UMTS, and WCDMA operations, the ideal frequency bands are 1.9 GHz and 2.1 GHz in a single antenna. In [5], a symmetrical L-slot antenna was designed covering 2.34–2.82 GHz, 3.16–4.06 GHz, and 4.69–5.37 GHz. A triband microstrip slot antenna for WLAN/WiMAX application was presented in [6]. A multiband internal antenna for all commercial mobile communication bands and 802.11a/b/g/n WLAN was designed in [9] with the area of 40 mm × 20 mm. In [11], a compact antenna with symmetrical L-strips was reported for WLAN/WiMAX operations; the three resonant frequencies cannot be adjusted independently. A CPW-fed monopole antenna was proposed in [12], which covers lots of applications but all are below 3 GHz frequency
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