Wideband Fabric Antenna for Ultra Wideband Applications using for Medical Applications

Traditional cancer detection imaging techniques suffer high costs, high false negatives, high false positives,and pain. The microwave imaging techniques overcome the limitations, which depend primarily on antenna design. If an antenna is wearable and implantable, the imaging system gives better results with less pain and cost. A wide band fabric antenna that operates at the ultra-wideband frequency with a low specific absorption rate (SAR) on breast phantom is verified. The proposed design has Jeans material as a substrate and the copper patch as a radiating element. The patch is designed in a circular shape with an M-type slot to suppress the spurious modes. The designed antenna model is commonly used for monitoring microwave imaging and has dimensions of 28X30X1.6 mm3. The proposed antenna design covers 2.3-8 GHz frequency with a broadside radiation pattern. The gain over the operating frequency is about 2.3-4.5 dB, and the efficiency is 55 %–79 %. The antenna model was designed and simulated in CST microwave studio. The performance of an antenna is tested on breast cancer to detect the presence of tumor cells in the breast. The antenna analysis on the phantom was done by considering the tumor location and corresponding results are presented. By varying the sizes of the tumor the antenna performance is analysed. The simulated SAR values of the proposed antenna design on breast phantom are under the limits of FCC

Design of clover slot antenna for biomedical applications

AbstractA new clover slot antenna operating at 2.45GHz Industrial, Scientific, and Medical (ISM) band for biomedical applications is presented and experimentally verified. By putting a single feed and truncating clover slots with extra perturbation, good performance of polarization can be achieved. Also, the miniaturized size of the proposed antenna is 14×12×0.8mm3 by utilizing the clover shaped slots. A broader bandwidth of 2.5GHz is obtained for reflection coefficient less than −10dB. In addition, the radiation pattern of proposed antenna exhibits the maximum gain of −6dBi

Parametric enhancement of a novel microstrip patch antenna using Circular SRR Loaded Fractal Geometry

The improvement in the performance of a novel microstrip patch antenna through added stages of a fractal geometry and a circular split ring resonator for multiband operation is presented. In its first stage, a coaxial-fed novel shaped patch is developed over a 60 mm × 60 mm × 1.6 mm FR4 epoxy substrate. The modification of the basic patch structure into a fractal geometry results into the addition of bands along with the parametric enhancement of reflection coefficient, gain and bandwidth. A further stamping of Circular Split Ring Resonator on reverse side of the substrate would result in significantly improved performance. The validation of the simulated results has been done and the measured set of data has been plotted against the simulated results graphically. Keywords: Parametric enhancement, Novel fractal, Coaxial fed, Metamaterial [MTM], Negative permittivity/permeability, Circular SR

Multiband SRR loaded Koch star fractal antenna

The Split ring resonator [SRR] loaded Koch star fractal antenna for multiple Freq band apps is presented. The CPW-Fed ant consists of Circular Split Ring Resonator [CSRR] which is fixed on reverse side of the substrate and iterated Koch star which is stamped on top of the FR4. The Koch fractal SRR antenna with a compacted size of 12 × 14 mm2 is fabricated and tested. The multiple Freq for antenna measured capitulate with a −10 dB at 1.88/6.54/7.88/12.20/15.08 GHz bands and cover up the Freq spectrum of GSM, WiMAX, IEEE 802.11a (WLAN)/b/g, IEEE 802.16e, ITU, S/C/X/Ku and K band, correspondingly. The extraction method of −ve permeability for the projected circular slit resonator is examined in detail. The antenna projected to have significant recompense, plus low profile, miniaturization capability with good S11 and VSWR is accepting for the functional frequency bands. Keywords: Coplanar waveguide [CPW], Koch star fractal, Multi band, Metamaterial [MTM], Negative permittivity/permeability, Circular split ring resonator [CSRR

Design of Diaphragm Based MEMS Pressure Sensor with Sensitivity Analysis for Environmental Applications

In this paper Micro-electromechanical System (MEMS) diaphragm based pressure sensor for environmental applications is discussed. The main focus of this paper is to design, simulate and analyze the sensitivity of MEMS based diaphragm using different structures to measure the low and high pressure values. The simulation is done through the finite element tool and specifications related the maximum convinced stress; deflection and sensitivity of the diaphragms have been analyzed using the software INTELLISUITE 8.7v. The change in pressure is to bending of the diaphragm that modifies the measured displacement between the substrate and the diaphragm. This change in displacement gives the measure of the pressure in that environment. The design of these studies can be used to improve the sensitivity of these devices. Here the diaphragm based pressure sensor produced better displacement, sensitivity and stress output responses are obtained from the square diaphragm. The pressure range from 0.6 MPa to 25 MPa and its maximum displacement is accordingly 59 mm over a pressure range of 0 to 2 MPa. Its sensitivity is therefore 2.35 [10E-12/Pa]

Design of compact Polygon Slot CPW Fed Antenna for Broadband/UWB Applications

Abstract — In this paper a low profile, small size polygon slot CPW fed antenna for broadband application is presented. The proposed antenna comprises of simple polygon radiator and rectangular ground plane. It resonates at 4.9 and 8.4 GHz frequency where return loss is well below to-10 dB. The proposed antenna is designed with FR4 epoxy substrate having dielectric constant of 4.4 and loss tangent of 0.02 and overall size 19x 21x 0.8 mm 3. The antenna is designed using simulation tool Mentor graphics 15.10 version which is based on method of moments (MoM). Simulation results show that the axial ratio (AR) bandwidth is as large as 115.4 % (4.1 GHZ- 15.3 GHz) with VSWR ≤ 2, which makes the antenna be used for broad band and ultra wideband (UWB) applications also. Keywords—Broad band network, Coplanar waveguide (CPW), gain, radiation pattern, ultra wideband (UWB) I

CPW-Fed Slot Antenna for Wideband Applications

A new coplanar waveguide (CPW)-fed wideband printed slot antenna is presented, and the impedance characteristics of this antenna with different sizes of tapers are discussed. The effect of tapering angle with the resonant frequency is also observed. The fundamental parameters of the antenna such as bandwidth, return loss, gain, radiation pattern, and polarization are obtained. All meets the acceptable antenna standards. The measured input impedance bandwidth (return loss < −10 dB) of the prototype antenna is 52% (4.27–7.58 GHz). The radiation patterns are bidirectional in both planes. This antenna can be part of various wireless communication systems

Design and development of CPW fed monopole antenna at 2.45 GHz and 5.5 GHz for wireless applications

The behaviour of various families of the antenna structures is studied. In that, CPW (Coplanar Waveguide) fed antennas show better behaviour for the Wireless applications. The slot antenna is used for precise operating frequency, where the frequency spectrum is 2.45 GHz and 5.5 GHz. To achieve the proposed frequency, the slot antenna is fed with Coplanar waveguide is implemented and measured with dimensions of 70 mm × 70 mm. To increase the bandwidth, first the mid section of two short slots of either side of the single pole length is increased slowly to check out the maximum bandwidth. The achieved peak bandwidth gradually starts decreasing at some length, considering the achieved peak value, The length responsible for decreasing peak value is to be noted. Now for obtaining the operating frequency lies in the frequency band, the mid section of long slot has to be decreased gradually; thus, operating frequency shows at 2.45 GHz and 5.51 GHz with return loss of −20 dB, and the whole design is printed on the FR4 substrate for better efficiency to the proposed frequency at maximum bandwidth, and thereafter to check out the characteristics of antenna the parameters such as Return loss characteristics, VSWR, Azimuth pattern, Elevation pattern and 3D distribution pattern

Design Of Temperature Sensors For Enviromental Applications

Abstract — MEMS sensors have been widely used in automobiles, airplanes, submarines, and biomedical devices. For some applications such as aerospace and underground oil exploration, sensors which can endure extremely high temperature are required. In this paper, the design and simulation of temperature sensor for high-temperature applications is proposed. The sensor is an array of bimorph cantilevers whose deflections are sensed by application of temperature. The cantilevers are initially thermally annealed to relax the film stresses. With change in materials of bimorph, overall sensitivity also changes. Keywords—MEMS, Cantilever, Bimorph, Displacement. The Temperature sensor works on the principle that deflection occurs due to an applie

PLANAR ACS FED DUAL BAND ANTENNA WITH DGS FOR WIRELESS APPLICATIONS

A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3 . The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices