Mandar Padmakar Joshi

This research presents an inverted ‘T’-shaped Defected Ground Structure (DGS)-loaded single feed circularly polarised nearly square microstrip patch antenna for wireless communication applications. The proposed antenna structure uses an inverted ‘T’-shaped DGS and exhibits an overall impedance (S11< −10 dB) of 665 MHz (12%) and an axial ratio bandwidth of 140 MHz (2.61%) with right-hand circular polarisation having a gain of 3.91 dBi. The proposed antenna is designed, simulated and fabricated using the FR4 substrate. The electrical size of the designed microstrip patch antenna is 0.238λ × 0.216λ. Using an inverted ‘T’-shaped DGS, the antenna size has been reduced by 13.8%. The detailed design and analysis of the proposed broadband circularly polarised microstrip patch antenna are discussed and presented. The fabricated antenna is tested, and the measured impedance bandwidth is 557 MHz (10%). The measured results are in good agreement with simulated results, and the proposed antenna can be suitable for WLAN, Wi-MAX and Hyper LAN applications.

This paper presents the design and analysis of a dual-band circularly polarized (CP) microstrip patch antenna for WLAN and vehicular communication applications. In this antenna, an L-shaped slot is cut, and a square parasitic patch with diagonally opposite corners cut is loaded in offset beneath to monopole antenna to realize dual-band CP response with wideband response. The antenna exhibits dual-band CP response at 2.45 GHz (WLAN) and 5.9 GHz (Vehicular) having 20.45% and 15.73% of simulated impedance bandwidth and 6.84% and 14.16% of axial ratio bandwidth for WLAN and Vehicular band, respectively. The measured impedance bandwidth (S 11 <-10 dB) is 19.43% and 12.73% for WLAN and vehicular band, respectively. The antenna design is simple and fabricated using an economical glass epoxy FR4 substrate with size of 45 × 40 mm 2. The measured results are found in good agreement with simulated results. The proposed antenna is analyzed using transmission line equivalent circuits, and the details are presented and discussed.

In this work, a probe fed rectangular microstrip patch antenna (RMPA) in S band have been proposed. Bandwidth enhancement is obtained by cutting a U- and two parallel rectangular slots. FR-4 substrate having dielectric constant of 4.4 and thickness of 1.6mm is used to design RMPA with an overall size of 38×48 mm ² . The designed antenna is simulated using CAD FEKO antenna simulation software. The proposed antenna has VSWR bandwidth of 177 MHz (2.53 GHz to 2.71 GHz) with gain of 1.14 dBi. The proposed microstrip patch antenna is fabricated and tested. The measured bandwidth is 145 MHz, which shows good agreements between simulated and measured results.

This work presents a probe fed square microstrip patch antenna with broad bandwidth. By cutting the slots in radiating elements and in ground plane broadband performance can be obtained. The proposed antenna is designed and fabricated using economical FR-4 substrate with size of 50×50 mm ² , The simulated and measured bandwidth is 138 MHz and 100 MHz respectively. The average gain of the antenna is observed to be less than unity.

A microstrip fed square patch antenna for wideband application is presented in this paper. The proposed antenna is designed to operate at 3GHz. Overall dimensions of antenna are 45×30 mm ² . FR4 substrate having dielectric constant 4.4 is used. Bandwidth enhancement is achieved by introducing defected ground structure(DGS), offset feed and modified patch technique. CAD FEKO simulation software is used for simulation. Fractional bandwidth of 229% with gain of 2.36 dBi is achieved.

In this paper, a microstrip-line fed printed monopole rectangular microstrip patch antenna with wide bandwidth having frequency band-notch function for wireless communication have been proposed. Bandwidth enhancement is obtained by rounding the corners of rectangular patch and modifying the ground plane. By cutting rectangular slot on the radiating element, the frequency band-notch characteristic is obtained. FR-4 substrate having dielectric constant of 4.4 and thickness of 1.6 mm is used to simulate printed rectangular monopole antenna (PRMA) having an overall size of substrate 55 × 45 mm ² . The designed antenna is simulated using CAD FEKO simulation software. The proposed antenna has impedance bandwidth of 6.61 GHz (2.11 GHz to 8.72 GHz) with a rejection band from 3.03 GHz to 3.48 GHz. The observed gain of proposed antenna is 2.42 dBi. The proposed microstrip patch antenna is fabricated, tested and measured result is presented in this paper.

This paper presents a dual band single feed circularly polarized square microstrip patch antenna (SMPA) for WLAN (2.4-2.48 GHz) and WiMAX (5.25-5.85 GHz) wireless communication applications. A square and L-shaped slot is etched inside the radiating patch to achieve dual-band and circular polarization respectively. The electrical size of proposed microstrip patch antenna is 0.22λ × 0.22λ. The antenna is fabricated using FR4 substrate with size of 40 × 40 mm 2 . The antenna resonates at 2.45 GHz and 5.5 GHz with bandwidth of 66 MHz and 121 MHz respectively. The proposed antenna has been fabricated, tested and measured results are presented in this paper.