A New Aperture Coupled Microstrip Slot Antenna

  1. A New Aperture Coupled Microstrip Slot Antenna Booster
  2. A New Aperture Coupled Microstrip Slot Antenna Combo

A new aperture-coupled circularly polarized microstrip antenna with F-shaped slot is proposed for wide beamwidth. The F-shaped slot is embedded at centre of the square microstrip patch on thin dielectric substrate and mounted on thick foam layer. This letter presents a new aperture coupled microstrip antenna with a nonsymmetric U‐shaped feed line and two rectangular slots on the ground plane. Simulation results show that the antenna has VSWR antenna is 6.6 GHz (47%).

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A microstrip-fed aperture coupled microstrip antenna was designed by Rao et. al. [1]. A variant of this antenna was implemented in FEKO for the following specifications:

  • 5.5 GHz centre frequency
  • 50 Ω input impedance
  • Substrate, ε = 3.2, height = 1.0 mm

Geometry for the slot antenna: (a) Top view and
(b) side view

Dimensions of geometry are:

  • dy = 29 mm
  • dx = 18 mm
  • Ws = 2 mm
  • Ls = 54 mm
  • Wm = 2.35 mm
  • Wp = Lp = 2t = 0.9dx = 16.2 mm

FEKO’s implementation of the planar Greens function features the ability to model the slots in the ground plane as magnetic triangles, which means that only the slots are meshed and not the ground plane itself, saving significantly on simulation resources.

Resonance at 5.5 GHzPrinciple plane radiation pattern at resonance
[1]Q. Rao, T. A. Denidni, R. H. Johnston, “A New Aperture Coupled Microstrip Slot Antenna,” IEEE Transactions on Antennas and Propagation, Vol. 53, No. 9, September 2005

Related content

Source

2008 International Conference on Recent Advances in Microwave Theory and Applications>852 - 853

A New Aperture Coupled Microstrip Slot Antenna Booster

Abstract

Aperture coupled microstrip slot antenna couples the patch antenna with microstripline through an aperture. To improve the radiation pattern, there are three techniques -First using reflector plate, second using cavity and third by adjustment of the phase angle using the movement of the patch antenna on the slot i.e. by adjusting the SWR distribution. The third technique improves the radiation pattern without using reflector plate or cavity and it increases the F/B ratio. One effective way to increase the impedance bandwidth is to change the feed shape and the slot shape. The shape of coupling aperture has a great effect on the strength of coupling between the feed line and the patch. Mainly thin rectangular shape of the slot is used in aperture coupled microstrip slot antenna. If, it is chosen a suitable combination of the shapes of feed and slot and tuned perfectly, it gives an optimum impedance bandwidth with a stable radiation pattern.

Identifiers

book ISBN : 978-1-4244-2690-4
book e-ISBN : 978-1-4244-2691-1
DOI 10.1109/AMTA.2008.4763142

Authors

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Aijaz, Z.

  • Dept. of Electron.&Commun., MANIT, Bhopal

Shrivastava, S.C.

A New Aperture Coupled Microstrip Slot Antenna
  • Dept. of Electron.&Commun., MANIT, Bhopal

Keywords

slot antennasantenna radiation patternsmicrostrip antennasmicrostrip linesreflector antenna feedsantenna feedaperture coupled microstrip slot antennapatch antennamicrostrip lineradiation patternreflector platecoupling apertureMicrostripAperturesShapeAntennas and propagation

slot antennasantenna radiation patternsmicrostrip antennasmicrostrip linesreflector antenna feedsantenna feedaperture coupled microstrip slot antennapatch antennamicrostrip lineradiation patternreflector platecoupling apertureMicrostripAperturesShapeAntennas and propagation

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A New Aperture Coupled Microstrip Slot Antenna Combo

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