Abstract

The proposed paper presents two I-shaped substrate slotted flexible microstrip patch antennas with reduced ground for radiolocation and military applications. The proposed antennas employ cellulose acetate having dielectric constant (∊ r ) of 4.2 as the substrate. The copper having conductivity of 5.95 × 108 Siemens m−1 has been used for designing of patch and ground. The substrate, patch slot and ground reduction is employed to enhance the antenna parameters such as return loss, VSWR (Voltage Standing Wave Ratio) and bandwidth. The first antenna is resonant at 1.775 GHz and 3.46 GHz with the impedance bandwidth of 1.503 GHz where as the second antenna has resonant frequencies of 1.815 GHz and 3.345 GHz and impedance bandwidth of 1.570 GHz. The performance of proposed antennas has been analyzed in terms of gain(dB), directivity(dBi), return loss(dB), impedance bandwidth(GHz), VSWR(voltage standing wave ratio) and impedance(Ω). The proposed antennas have been fabricated and tested using E5071C Network analyser and anechoic chamber. It has been concluded that the practically tested results closely matches with the simulated results obtained in CST Microwave Studio 2016. Both the antennas can be effectively employed for radiolocation, aeronautical mobile communication, maritime mobile communication and military applications.

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