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

ABSTRACT 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.
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