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Abstract
A novel low profile wideband internal planar monopole (PM) antenna is proposed. It consists of a rectangular planar monopole, 10 × 20 mm2, loaded with a pair of parallel small thin plates, 8 × 12 mm2, placed on the two radiating sides of the PM antenna. The proposed antenna has two ground planes. A small horizontal ground, 9 × 20 mm2, that holds the PM antenna (making the overall volume of the antenna element 9 × 20 × 23 mm3) and the vertical ground, 50 × 80 mm2 that can be treated as the ground plane of the circuit board of a mobile phone. A prototype of the proposed antenna has been fabricated and tested. Its operating bandwidth with S 11 lower than −10 dB is 1.66–7.35 GHz, which covers the digital communication system (DCS 1.72–1.88 GHz), personal communication system (PCS 1.85–1.99 GHz), universal mobile telecommunication system (UMTS 1.92–2.17 GHz), wireless local area network (WLAN), which usually operate in the 2.4 GHz (2.4–2.484 GHz) and 5.2/5.8 GHz (5.15–5.35 GHz/5.725–5.825 GHz) and worldwide interoperability for microwave access (WiMAX 2.305–2.360 GHz/2.5–2.69 GHz) bands. The radiation pattern of the antenna is omnidirectional with Uniformity value of more than 80%. The antenna has a flat transfer function and group delay over the required bands.