Conference Paper

Miniature dual-frequency half planar inverted F-L-antenna for WLAN/cellular applications

Mobile Satellite Commun. Res. Centre, Univ. of Bradford, Bradford, UK
DOI: 10.1109/APMC.2009.5385308 Conference: Microwave Conference, 2009. APMC 2009. Asia Pacific
Source: IEEE Xplore


A reduced size miniature dual-bands planar inverted F-L antenna for WLAN and cellular applications is achieved by applying the magnetic wall concept. The proposed antenna provides a 12% and 9.3% bandwidth at S11 < -10 dB for 2.5 GHz and 5.2 GHz WLAN bands that completely encompasses the desired ISM2400 and IEEE 802.11a standards. The proposed antenna is minimised to a volume of 30 × 15 × 8 mm, which is about 0.25 wavelengths at the centre frequency 2450MHz, while the antenna height achieved was about ¿/15 at the centre frequency. The experimental and simulated return losses of the proposed antenna on a small finite ground plane (30 × 15mm) show good agreement. The simulated gains and far field radiation patterns are presented to fully characterize the performance of this antenna.

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    ABSTRACT: By applying the magnetic wall concept, compact dual-band and wideband low-profile planar inverted F-L antennas for wireless local area network (WLAN) (2.4 GHz/5.2 GHz) and ultra-wideband (UWB) applications are proposed. The dual-band antenna shows a relative bandwidth of 12% and 10.2% in the ISM-2400 and IEEE 802.11a frequency bands, respectively, at reflection coefficient |S11| ≤ −10 dB. By carefully tuning the geometry parameters of the dual-band design, the two resonant frequencies can be merged to form a wide bandwidth antenna to cover 3,000 to 5,400 MHz (57% relative bandwidth) for a similar reflection coefficient |S11|; this fully covers the lower band UWB (3.1–4.8 GHz) spectrum. The experimental and simulated results in terms of reflection coefficient, gain, radiation efficiency, and field pattern of the two antennas on a small finite ground plane of size 30 mm × 15 mm show good agreement.
    No preview · Article · Apr 2011 · Electromagnetics
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    ABSTRACT: Recently, the demand for wireless devices that support multi-band frequency has increased. In fact, employing single-band antennas leads to large space requirement in handheld devices. Therefore, due to the space constraints in mobile devices, an antenna which will cover multiple bands of frequencies will be the best solution in order to allow more space in the mobile devices. The integration of such technology in mobile communication system has led to a great demand in developing small size antenna with multi-band operation that is able to operate in the required system. In this paper, a triple band planar inverted-F antenna (PIFA) is proposed. The antenna has been measured and found to operate at three operating frequencies of GSM bands (900 MHz and 1800 MHz), and Bluetooth band (2400 MHz). A dual L-shaped slot was used on the patch to obtain the triple-band resonant frequencies. Performance of the antenna has examined and results have shown that the proposed antenna can successfully cover frequencies 900 MHz, 1800 MHz and 2400 MHz.
    Full-text · Article · Jan 2015