Dual band-notched monopole antenna with enhanced bandwidth for ultra-wideband wireless communications

Abstract

A new configuration of an ultra-wideband (UWB) dual band-notched antenna is presented. The designed geometry consists of octagonal radiating patch, a 50 Ω microstrip feed-line on the front and an asymmetric partial ground on the back. For impedance bandwidth enhancement, a unilateral stepped structure is utilised on the ground. By etching two E-shaped slots connected to each other on the radiating patch and applying E-shaped defected ground structure on the back, dual notched bands are achieved. The antenna is printed on a low profile FR4 substrate with a compact size of 25 × 18 × 1 mm^3. The experimental results indicate that the antenna has an impedance bandwidth from 2.55 to 21.65 GHz for voltage standing wave ratio ≤2, except the notched bands on worldwide interoperability for microwave access and wireless local area network bands. Moreover, stable radiation patterns and gains within the operating band are shown.

Keywords

• monopole antennas
• ultra wideband antennas
• ultra wideband communication
• microstrip antennas
• antenna radiation patterns
• dual band- notched monopole antenna
• enhanced bandwidth
• ultrawideband wireless communications
• UWB
• designed geometry
• octagonal radiating patch
• microstrip feedline
• asymmetric partial ground
• impedance bandwidth enhancement
• unilateral stepped structure
• E-shaped slots
• worldwide interoperability
• microwave access
• wireless local area network bands
• stable radiation patterns