In this paper, a compact tri-band monopole antenna with asymmetric coplanar strip (ACS)-fed structure is proposed for long term evolution (LTE), Wireless Broadband (WiBro), Worldwide Interperability for Microwave Access (WiMAX), wireless local area network (WLAN) and 4.9 GHz public safety applications. The proposed antenna consists of an F-shaped radiating element along with a meanderd line structure, which occupy a compact size of 10 × 17.5 mm2 including the ground plane. The desired resonant frequencies at 3.5/5.5 GHz for WiMAX and 5.2/5.8 GHz WLAN can be achieved by properly selecting the length of the two horizontal branches in F-shaped patch and by introducing a meanderd line structure, another desired resonant frequency at 2.3 GHz for LTE/WiBro has been achieved. A prototype of the proposed antenna is designed, fabricated and validated experimentally. The measured results demonstrate that the proposed antenna has −10 dB impedance bandwidth of 120 MHz (2.3–2.42 GHz), 450 MHz (3.3–3.75 GHz), and 1500 MHz (4.5–6.0 GHz) along with good onmi-directional radiation patterns and acceptable peak gains in all the three operating bands.
Radiation Pattern Wireless Local Area Network Resonant Mode Return Loss Horizontal Strip
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