Gain and Bandwidth Enhancement of a CPW-fed Bidirectional Dumbbell Shaped Slot Antenna Using PRS

Abstract

A bidirectional, coplanar waveguide (CPW) fed dumbbell-shaped slot antenna with partially reflecting surface (PRS) with parasitic patches for gain, bandwidth, and radiation pattern improvement is investigated. A dumbbell-shaped CPW-fed slot antenna has a dimension of 0.71λ g × 0.71λ g × 0.0571λ g . The proposed antenna is simple in design and has low profile structure. To achieve improvement in bandwidth, gain, and bidirectional radiation pattern, PRS with parasitic patches are placed on top and bottom of antenna at a distance of 0.25λ g . The proposed design yields wide bandwidth of 4.11 GHz (4.48-8.59 GHz) with percentage bandwidth of 62.89%, S 11 ≤ −10 dB, and peak gain of 5.61 dBi. The variation in the gain over desired bandwidth is less than 3 dB. The antenna is fabricated using an FR4 substrate with relative permittivity of 4.4. The measured results corroborate the design and stipulate the proposed structure to be suitable for applications in C band.

Design and Development of CPW-fed Miniaturized MSA for Improved Gain, Bandwidth and Efficiency Using PRS

“…The proposed antenna structure is compared with the reported antennas as mentioned in Table 1. The proposed antenna structure has more gain than the antenna in [22]. The proposed antenna has larger bandwidth and % bandwidth than antennas in [26][27][28][29]36].…”

“…The partially reflecting surfaces with periodic patches over a dielectric substrate have been effectively used as superstrate which results in low profile Resonant Cavity Antenna (RCA) [15][16][17]. Gain and bandwidth enhancement using PRS with parasitic patches is studied in [18][19][20][21][22]. Use of PRS to get wideband response has been investigated in [23,24], but the available bandwidth is limited by the…”