Design and development of aperture‐coupled microstrip antennas for intensified bandwidth, adequate gain and low cross‐polarization

Abstract

In this letter, a novel method that can achieve critical coupling of a PIFA is proposed. The proposed antenna can accomplish critical coupling by attaching a ferrite sheet without changes to the structure of the antenna. A ferrite sheet is used to increase the shunt inductance of the shorting pin loop. An equivalent circuit based on transmission line modeling was used for designing the ferrite-sheet-loaded PIFA, and it was verified that critical coupling was accomplished based on a Smith chart produced by a 3D EM simulator. The proposed PIFA has a very wide bandwidth of 16% for VSWR < 2, and a good omni-directional radiation pattern at its operating frequency. ACKNOWLEDGMENTSABSTRACT: This article presents a novel design of complementarysymmetry aperture-coupled microstrip antenna for wideband, adequate gain, and low cross-polarization. An experimental bandwidth of 129.51% with gain of 5.17 dB is achieved. The antenna operates from 3.85 to 18 GHz, which covers C, X, and Ku bands. The obtained crosspolar power level is À30.5 dB down with respect to co-polar. The effect of coupling aperture and microstrip feedline is studied and reported.

Modelling of Multiband Patch Antenna Based on I Shaped Slots on DGS for Wireless Applications

“…Figure 3 depicts the return loss of CSMSA as a function of frequency. The resonant frequency for CSMSA is 2.4057 GHz, which is closer to the designed frequency of 2.4 GHz, and the impedance bandwidth over return loss less than -10dB is 2.089 percent, according to this figure.4 and Radiations pattern [10] of CSMSA at 2.4020GHz which is observed to be broadside in nature and linearly polarized [7] as shown in Fig. 4.…”

“…Micro strip Antennas (MSAs) are widely used in modern communication systems due to their appealing properties such as planarity, lightweight, low profile, low production cost, and so on [1][2]. However, the main limitations of MSAs are their narrow impedance bandwidth and low gain [7,4]. Which is due to the resonant characteristics of the patch structure [2].…”