Design of a multi-band loop antenna for wireless communications: Simulation and analysis

A multiband loop antenna that consists of a strip loop with two L-shaped arms connected together and designed to share the same feed and shorting points is introduced. In particular, this design can be considered to be an enhancement to the antenna presented in Chi and Wong (2007). The proposed antenna has sufficient bandwidth which makes it suitable for Global System for Mobile (GSM) in the 900 MHz band, it also supports effectively the Advanced Mobile Phone Systems (AMPS) 824–894 MHz, and the Digital Communication Systems (DCS) 1900 MHz bands with 2.5:1 VSWR. As in Alkanhal (2005), the chip-resistor loading technique was investigated by introducing a 3 Ω resistor to the antenna instead of the shorting pin between the antenna and ground. This paper presents simulation results, detailed design, and parametric study with analytical discussion for the proposed antenna