Optimization of impedance bandwidth for the printed rectangular monopole antenna

Abstract

This paper describes a printed rectangular-plate monopole, fed by microstrip line.The effect of varying plate width, feed-gap height and feedline width on the impedance bandwidth is examined. It is shown that for a fixed ground-plane size, that optimisation of these parameters can yield an impedance bandwidth ratio of 4.3:1, without using any broadbanding techniques.

Fractal Shaped Antenna based tri-band Energy Harvester

“…The antenna is built on 1.6 mm FR4 substrate with a microstrip feed line of width 1mm (Wf) which encompasses a total area of 14×6.6 cm 2 . Partial ground plane (Lg×Wg) with feed gap (Fg) optimisation technique is used to obtain multiband impedance matching in the desired frequencies [11][12].…”

Reduction of ground-plane-dependent effects on microstrip-fed printed rectangular monopoles

“…The monopole plate is rectangular, with the dimensions w p ¼ 20 mm and h p ¼ 30 mm, which is fed by a microstrip feed line of width w f ¼ 2.5 mm via an SMA microstrip-launch connector. The optimum feed gap between the plate and the ground plane is h gap ¼ 2 mm [7]. This gives the largest impedance bandwidth because the various modes undergo little impedance variation with frequency, because of a balance between the feed-probe inductance and plate-to-ground-plane capacitance.…”

“…However, the classical orientation of the radiator with respect to the ground plane has placed limitations on its practical use, particularly in portable and fixed terminal devices. The recent introduction of a ground plane printed on the opposite side of a substrate [6,7] has given these monopoles a lower profile, making them more suitable for integration. The rectangular printed element with microstrip feed has been optimised for wide bandwidth [7] and the use of EBG surfaces have been used as a reflector to provide directivity with a low profile [8].…”

“…The recent introduction of a ground plane printed on the opposite side of a substrate [6,7] has given these monopoles a lower profile, making them more suitable for integration. The rectangular printed element with microstrip feed has been optimised for wide bandwidth [7] and the use of EBG surfaces have been used as a reflector to provide directivity with a low profile [8]. Printed circular disc monopoles have recently been shown to be a good candidate for ultra-wideband (UWB) systems [9].…”

A Planar Monopole Uwb Antenna With Improved Lower End Bandwidth Using an L-Shaped Stub Extended on the Ground Plane

“…Planar UWB antennas [1][2][3] have gained tremendous interests due to their compact size, low cost, ease of fabrication and low power spectral density. Several UWB monopole configurations have been proposed, such as circular, square, elliptical, pentagonal, hexagonal and circular, among which the square monopole and circular monopole are most popular.…”