DC Ground Compact Wideband Omnidirectional Vertically Polarised Slot Loop Antenna for 4G Long-Term Evolution Applications


A compact, wideband, omnidirectional, vertically polarised antenna without electrostatic discharge problems is proposed in this study for 4G long-term evolution applications. The proposed antenna is composed of three identical basic radiators separated by an angle of 120°. The basic radiator is based on a slot loop which is a wideband and DC ground structure. By bending the basic radiators, the antenna achieves better impedance matching and lower gain variation in the horizontal plane in a compact size. The proposed antenna reaches a fractional bandwidth of 45.5% for the voltage standing wave ratio (VSWR) < 1.5, a peak gain from 2.4 to 3.8 dBi with a gain ripple around 2 dB in the omnidirectional plane. It operates from 1700 to 2700 MHz, covering most 4G long-term evolution frequency bands. Both simulation and measurement of a prototype is done in this study to verify the antenna performance.


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

Bandwidth; Electrostatic devices; Loop antennas; Omnidirectional antennas; Radiators; Slot antennas; Wireless telecommunication systems; Antenna performance; Compact size; Fractional bandwidths; Gain variations; Ground structure; Simulations and measurements; Slot loop antenna; Voltage standing wave ratio (VSWR); Long Term Evolution (LTE)

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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Publication Date

01 Jun 2018