Printed tri‐band monopole antenna structures for wireless applications

This article proposes a novel tri‐band printed monopole antenna structure for wireless applications in GSM, DCS, and wireless local area network applications, IEEE 802.11 industrial, scientific, and medical (ISM) band. The proposed antenna consists of a rectangular patch monopole printed antenna in which a slot is cut, and dual‐band E‐shape patch is placed. The three arms in monopole antenna generates three resonate frequencies to cover 890–960 MHz GSM band, 1710–1880 MHz DCS band, and 2.4–2.5 GHz ISM band. Slots are removed to coincide with central arm to obtain the second structure. Central arm of antenna resonate at GSM, whereas the other two side arms resonate at DCS and ISM band; therefore three bands can be optimized easily. The proposed antennas can easily be fed by using a 50 Ω probe feed. The simulated VSWR is <2 over 890–960 MHz, 1710–1880 MHz, and 2.4–2.5 GHz The radiation patterns indicate the suitability of these antennas for wireless applications.