Sanjeev Yadav

Ultra-wideband truncated rectangular monopole antenna with band-notched characteristics

Design and performance of an ultra-wide band truncated rectangular monopole antenna with band-notched characteristics is presented in this paper. In the proposed antenna, split ring resonator (SRR) is etched inside the truncated rectangular patch of the monopole antenna to achieve band-notch operation. The achieved impedance bandwidth of antenna is from 2.43 GHz to 13.30 GHz, for VSWR <; 2. With the insertion of SRR in truncated rectangular patch band-notched characteristic from 5.04 GHz to 6.09 GHz (VSWR >; 2) suitable for IEEE 802.11a WLAN band (5.15 - 5.35 GHz and 5.725 - 5.875 GHz) and HIPERLAN/2 band (5.45 - 5.725 GHz) is achieved. The proposed antenna shows average antenna gain of 4.35 dBi with a variation of ± 1.7 dBi over the impedance bandwidth. In the notched band, the antenna gain falls down to 3.45 dBi as compared to truncated rectangular monopole antenna gain of 5.65 dBi.

A Novel Approach of Triangular-Circular Fractal Antenna

In this paper a combination of triangular and circular shape microstrip antenna design is proposed. The proposed design of antenna will work in wireless application and provide contribution in the field of ultra wide band application. The proposed design is fabricated on low cost FR-4 epoxy substrate with relative permittivity 4.4 and having dimension 17.89×21.45×1.6 mm3. This proposed antenna design operates over the frequency range 4.12 GHz-6.8 GHz. For the proposed design return loss -33.74 dB has achieved at resonant frequency 5.6 GHz. Also VSWR <; 2 for entire operating frequency range. In this paper, microstrip feed line has used to feed the proposed antenna. The proposed design exhibits gain up to 2.2 dB over frequency range. The radiation pattern of the proposed design exhibits symmetry over frequency range in E-plane and omni-direction in H-plane. The simulation of the proposed antenna design has done by High Frequency Structure Simulator.

Full Composite Fractal Antenna with Dual Band used for Wireless Applications

In this paper a full composite fractal antenna, having a modified Sierpinski fractal antenna with 50-Ω microstrip line, used for dual band wireless applications. The S11 parameter and radiation characteristics of the antenna design indicate that a Sierpinski fractal antenna with circular slot having Dual Band frequency bandwidth from 3.8 GHz to 4.4 GHz and 4.8 GHz to 5.4 GHz to covering 5.2 GHz for C-Band and X-Band wireless applications in 3.8 GHz- 14 GHz frequency range. The proposed antenna is fed by a 50-Ω microstrip line and designed on a low cost FR4 substrate having dimensions 96 (L) ×72 (W) × 1.5 (t) mm3 with □r=4.9 and tan δ= 0.025. The antenna shows acceptable gain with nearly omni-directional radiation patterns in the frequency band.

A Compact Frequency Selective Surface Based Band-Stop Filter for WLAN Applications

This paper presents a compact frequency selective surface (FSS) based band-stop spatial filter for WLAN application which can be useful for modern communication system. The proposed structure is designed on PTFE substrate which have exceptional weather and heat resistance with excellent insulator characteristics. It is a single sided metallic square patch FSS which give 10-dB insertion loss bandwidth from 5 to 6 GHZ and resonated at 5.5 GHZ. The unit cell has the aspect dimension of 0.302λ×0.302λ×0.0366λ millimeter cube. The proposed design has been simulated using CST Microwave studio. CST microwave studio is based on finite difference time domain method (FDTD).

A dual band star fractal antenna with slot for wireless applications

In this paper a Dual Band Star fractal antenna with slot is proposed for wireless applications, with a semi-elliptical ground plane. The proposed antenna is designed to operate at two different bands having bandwidth 1GHz and 1.2 GHz at resonant frequencies 2.8 GHz and 5.7 GHz respectively for wireless applications with good return loss and radiation pattern characteristics, in the frequency band. The proposed antenna is fed by a 50Ω microstrip line and fabricated on a low-cost FR4 substrate having dimensions 33.5(L) × 28.5(W) × 1.6(h) mm3 with εr and tanδ=0.025. The antenna shows acceptable gain with nearly omni-directional radiation patterns in the frequency band for wireless applications as Wi-MAX and WLAN.

Miniaturized band pass double-layered frequency selective superstrate for Wi-Max applications

In this paper, a double-layered frequency selective surface(FSS) superstrate was proposed. The unit cell of the proposed FSS consists of a square slot and a Jerusalem cross structure, which are printed on two sides of the substrate. It is designed on the FR4 dielectric substrate with a relative permittivity of 4.8, loss tangent 0.025 and a thickness of 1.6 mm. The proposed structure shows excellent band-pass response with respect to different incidence angles. It was found that a band pass response occur at the Wi-Max resonant frequency of 2.5 GHz. The overall bandwidth of the simulated structure is 2.35 GHz. Performance evaluated by CST computer simulation. FSS is a metallic screen with frequency selective properties which are used as a spatial filters through which EM energy with a specific frequency range may be propagated.

Analysis and design Rectangular patch with half Circle Fractal Techniques

In this paper, Rectangular patch with circular half geometry design is proposed. The proposed design has operate at dual band of frequency 2.7-2.9 GHz and 7.8-8.5 GHz. The proposed design can be used in the military for meterological purpose and satellite communications. The proposed design is fabricated on RTduroid/5880 with relative permittivity 2.2 and having dimension 42× 42×32mm3. To get the proper impedance matching of 50Ω, coaxial feed line is used. The proposed design has return loss -18.31dB and -23.31dB in frequency band 2.7-2.9Ghz and 7.8-8.5Ghz. Radiation pattern of proposed design in E-plane and Hplane is acceptable. The proposed design is simulated using High Frequency structure simulator.

A compact CPW fed modified circular patch antenna with stub for UWB applications

In this paper, a new coplanar waveguide CPW fed Modified Circular Patch Antenna (MCPA) is presented. The proposed antenna is designed to operate from 3 GHz to 12 GHz. It consists of a circular patch which is truncated from two sides with respect to feed line. A stub of optimized dimension is attached to other side at a proper location to achieve ultra wide band characteristics. The proposed antenna is printed on a dielectric substrate glass epoxy FR 4 substrate and fed by a 50 Ω CPW on the same layer, which can yield an ultra wide bandwidth (-10 dB reflection coefficient) with satisfactory radiation patterns. The radiation patterns in the x-z plane are relatively omnidirectional, whereas the y-z plane patterns are bidirectional similar to that of a monopole antenna. The performance and characteristics of the antenna are investigated in order to understand its operation. It is proposed that this antenna can be part of various ultra wideband communication systems.

A novel band pass double-layered frequency selective superstrate for WLAN applications

In this paper, a Band Pass frequency selective surface(FSS) superstrate was proposed for the WLAN applications. Proposed FSS structure is made up of ring slot and a Jerusalem cross, which are etched on two opposite sides of the dielectric substrate. Structure is designed on the FR4 dielectric substrate with a relative permittivity of 4.4, loss tangent 0.025 and a thickness of 1.6 mm. The proposed structure shows excellent band-pass response with respect to different incidence angles. It was found that a band pass response occur at the WLAN resonant frequency of 2.4 GHz. 3 dB bandwidth of the simulated structure is 1.30 GHz.

A polarization independent single layer Frequency Selective Surface for quadruple band pass

In the propound work, a compact single layer Frequency Selective Surface has been designed that possess the characteristics of being polarization independent. This attribute of the structure gives same frequency response irrespective of the 0° polarization or 90° polarization of electromagnetic wave. In this paper, three designs have been proposed, the first two designs has affected from different polarization but in the last design we have achieved polarization independent FSS as of symmetrical behavior of the structure. The superstrate is incorporated of FR-4 substrate and a single sided PEC layer on it. In the third design, structure possesses quadruple pass band that is Wi-max (2.5 GHz) band, WLAN (5.5 GHz) band, and dual X-band (8.6 /10.9 GHz). CST Microwave Studio 2014 has been used to realize the frequency response via simulations.