Brijesh Mishra

A Compact and Wide Band Microstrip Patch Antenna for X-Band Applications

In this paper a coaxial probe feed modified swastika shape patch antenna is designed and analyzed by using the finite element method based High Frequency Structure Simulator (HFSS) and Method of Moment based Applied Wave Research (AWR) Microwave Office simulation tool. Proposed Structure is investigated for different dimensions (Length and Width) of rectangular slots cut from the patch antenna to obtain the broadband frequency range in X-band (8-12 GHz). The impedance bandwidth of the proposed antenna is 16.42% with centre frequency of 9.5 GHz at-10 dB, which is further improved to 17.89% after the parametric analysis of different dimensions of the rectangular slot cuts made on the patch antenna. The simulated radiation pattern (Electric field and Magnetic field), radiation efficiency, gain (in dB), VSWR (in dB) and return loss (S11 in dB) are demonstrated for proposed structure.

Gap Coupled Dual-Band Petal Shape Patch Antenna for WLAN / WiMAX Applications

A compact gap coupled dual-band patch antenna is proposed for WLAN and WiMAX applications. Two resonating frequencies at 3.6GHz and 5.2GHz with a frequency ratio of 1.40 (theoretical), 1.45 (simulated) and 1.48 (measured) are observed. The frequency ratio depends on the thickness of substrate and gap length between the fed and parasitic patches. The impedance bandwidth at lower resonant frequency is 23.7% (theoretical), 3.9% (simulated) and 8.7% (measured) and at upper resonant frequency it is 23.5% (theoretical), 4% (simulated) and 9.2% (measured). Simulated gain of the patch antenna is 1.6dBi at lower resonant frequency and 4.2 dBi at upper resonant frequency. Voltage Standing Wave Ratio (VSWR) remains below 1.2. The electric and magnetic field radiation patterns at both the resonating frequencies clearly depict that the co-polarization is higher than the cross polarization. Experimental return loss (|S_11|), VSWR, input impedance and group delay are in close agreement with theoretical and simulated (by High Frequency Structure Simulator (HFSS) Software) results.

Slots Loaded Multilayered Circular Patch Antenna for Wi-Fi/WLAN Applications

In the present work, a circular dual-band patch antenna structure with four rectangular slots is proposed and fabricated for wireless applications. The performance of patch antenna has been analyzed in terms of antenna parameters return loss, VSWR, radiation pattern, and gain. A maximum gain of 3.93 dB at lower resonant frequency of 3.71 GHz and a gain of 3.09 dB at upper resonant frequency of 5.51 GHz are achieved. E-field beam width of 230° and 205° and H-field beam width of 250° and 165° are observed for lower and upper resonance frequencies at −3 dB. The experimental results of return loss and VSWR of the proposed structure are presented along with the simulated results .

Quad Bands U-Shaped Slot Loaded Probe Fed Microstrip Patch Antenna

The micro strip U-shape slotted patch antennas have been drawing attention in various wireless interoperability microwave access (WiMAX) applications since last two decade. The U-shape slotted micro strip antennas have grown as a dominant part of research with their vital roles in mobiles and satellite communication. In this paper design of U shape slotted micro strip antenna is proposed which work at four bands with appreciable gains. It can be used in S-band, C-band and X band communication systems. The substrate Teflon based material of permittivity 2.08 is selected for U-shape microstrip patch antenna design. Proposal to measure different bandwidths has been exercised for the HFSS 13.0 (High Frequency Structure Simulator) based model.

A Dual Band Double Inverted L-Slots Microstrip Patch Antenna

A dual-band inverted double L-slots micro strip patch antenna is proposed for S-band and C-band frequencies applications. Two resonance frequencies are found to be 2.8 GHz and 5.4 GHz and -10 dB bandwidth of lower and upper resonance frequencies are 8.57% and 13.7% respectively. It is observed that frequency ratio is more sensitive with the dimensions of L-shaped slot. The frequency ratio of the antenna for a given dimension of L-slot is found to be 1.93 and gain of the antenna is 1.25 dB for lower resonance whereas 4.80 dB at upper resonance. The results are compared with the reference single band micro strip patch antenna.