A low profile wide slot antenna for dual band and dual sense circular polarization (CP) is proposed here and is simulated by using HFSS simulation software.The proposed antenna having a C shaped patch for dual band operation and a wide square slot etched on the ground with two strips for CP operation. In between radiating patch and ground plane, designed antenna has a layer of easily available dielectric (FR-4) material. Proposed antenna shows an impedance bandwidth of 13.8 % at 2.38 GHz of centre frequency and 9.7 % at 4.43 GHz of centre frequency for lower and upper band respectively. The 3-dB axial ratio (AR) bandwidths for lower and upper band are 18.8 % (at 2.44 GHz of centre frequency) and 13.3 % (at 4.29 GHz of centre frequency), respectively. The peak gain for the lower and upper band is found as 4.1 dBi and 3.3 dBi, respectively. A close agreement has been found between the simulated and the measured results.
In this paper a novel compact slit loaded line fed microstrip antenna is presented for UMTS/WLAN/WIMAX lower band applications. The proposed antenna has been fabricated on glass epoxy substrate having dielectric constant 4.2. The experimental results show that the antenna can provide two separate impedance bandwidths of 247MHz (about 15.10% centered at 1.64GHz) and 634MHz (about 26.63% centered at 2.38GHz), which is best suited frequency range of UMTS(1.92-2.17GHz),WLAN(2.40-2.48GHz) and WIMAX(2.495-2.695GHz). Good impedance matching and radiation efficiency in the desired frequency bands has been achieved.
A new approach based on the incorporation of Zshaped defected ground structure (DGS) in microstrip antenna (MSA) for improving impedance matching and cross polarization (XP) performances is proposed in this paper. Through detail analysis of the surface current densities, and input impedance, the proposed DGS is integrated into a rectangular MSA (RMSA) to realize flat relative XP reduction of 22 dB in the H-plane around broadside angular range of ±60°. Further, an equivalent circuit model (ECM) for the proposed antenna is introduced by considering the mutual coupling in between the DGS and patch and the model is verified using circuit-system-EM cosimulation software, Advanced Design System (ADS). A prototype has been fabricated and tested for the validation of simulated results and it shows good agreement with each other. The antenna operates over 2. 32-2.58 GHz with good far-field radiation characteristics and a peak gain of 2.8 dBi at the resonating frequency 2.4 GHz. Hence, the proposed design can be useful for the IEEE 802.11b applications.
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