Now showing items 41-52 of 52
Abstract: | A compact, planar, wideband antenna designed by modifying the coplanar waveguide is presented in this letter. The proposed antenna finds a wide range of applications including advanced wireless systems (AWS), DCS-1800, DCS-1900/PCS/PHS, WiBro, BlueTooth/WLAN/WiBree/ZigBee, DMB, Global Star Satellite Phones, and digital cordless phones. Wide bandwidth > 75% centered at 2.50 GHz, quasi-omnidirectional radiation coverage along with moderate gain and efficiency are the salient features of the antenna. A prototype fabricated on a substrate with dielectric constant 4.4 and thickness 1.6 mm occupies an area of (31times 64) mm2. Details of antenna design and discussions on the effect of various antenna parameters on the radiation characteristics are presented. |
URI: | http://dyuthi.cusat.ac.in/purl/2724 |
Files | Size |
---|---|
Dyuthi-P00361.pdf | (769.8Kb) |
Abstract: | Effective use of fractal-based metallo-dielectric structures for enhancing the radar cross-section (RCS) of dihedral corner reflectors is reported. RCS enhancement of about 30 dBsm is obtained for corner reflectors with corner angles other than 90deg. This may find application in remote sensing and synthetic aperture radar. |
URI: | http://dyuthi.cusat.ac.in/purl/2757 |
Files | Size |
---|---|
Dyuthi-P00376.pdf | (257.2Kb) |
Abstract: | A novel fixed frequency beam scanning microstrip leaky wave antenna is reported. The beam scanning at fixed frequency is achieved by reactive loading. Simulation and measured results shows frequency scanability of 80° as well as fixed frequency beam steering of 68° over the −10 dB impedance band of 4.56–5.06 GHz. |
URI: | http://dyuthi.cusat.ac.in/purl/2740 |
Files | Size |
---|---|
Dyuthi-P00374.pdf | (178.9Kb) |
Abstract: | A novel reconfigurable, single feed, dual frequency, dualpolarized operation of a hexagonal slot-loaded square mwrostrip antenna is presented in this paper. A pin diode incorporated in the slot is used to switch the two operating frequencies considerably, without significantly affecting the radiation characteristics and gain. The proposed antenna provides a size reduction up to 61% and 26% Jor the two resonating frequencies, compared to standard rectangular patches. This design also gives considerable bandwidth up to 3.3% and 4.27%, for the two frequencies with a low operating frequency ratio |
URI: | http://dyuthi.cusat.ac.in/purl/1420 |
Files | Size |
---|---|
A reconfigurati ... ntrolled by pin diodes.PDF | (1.097Mb) |
Abstract: | The scattering behaviour of fractal based metallodielectric structures loaded over metallic targets of different shapes such as flat plate, cylinder and dihedral corner reflector are investigated for both TE and TM polarizations of the incident wave. Out of the various fractal structures studied,square Sierpinski carpet structure is found to give backscattering reduction for an appreciable range of frequencies. The frequency of minimum backscattering depends on the geometry of the structure as well as on the thickness of the substrate. This structure when loaded over a dihedral corner reflector is showing an enhancement in RCS for corner angles other than 90◦. |
URI: | http://dyuthi.cusat.ac.in/purl/2725 |
Files | Size |
---|---|
Dyuthi-P00362.pdf | (1.120Mb) |
Abstract: | A novel dual frequency dual-polarized square microstrip patch antenna embedded with a slot is presented. The proposed antenna offers tunability of the frequency ratio between the two frequencies by adjusting the slot dimensions. This configuration also provides a size reduction up to -51 and 35% for the two modes as compared to a square micro strip patch antenna |
URI: | http://dyuthi.cusat.ac.in/purl/1371 |
Files | Size |
---|---|
Single-feed dua ... are microstrip antenna.PDF | (1.456Mb) |
Abstract: | A novel dual frequency design of a square microstrip antenna coaxially fed along the diagonal with a chip capacitor mounted at the bottom of the stub is introduced. This design provides enhanced area reduction and good cross-polarization levels. The antenna design can be used as a compact antenna system where limited size is a major requirement. The details of the antenna design and experimental results are presented |
URI: | http://dyuthi.cusat.ac.in/purl/1382 |
Files | Size |
---|---|
Slot coupled sq ... al-frequency operation.PDF | (1.351Mb) |
Abstract: | The use of a split-ring resonator (SRR)-loaded waveguide for the design of a band-rejection filter with adjustable bandwidth is reported. The width of the stopband can be adjusted by suitably positioning the SRR array in the waveguide. The rejection band can be made very narrow by placing the array at the electric-field minimum. The stopband attenuation depends on the number of unit cells in the array. |
URI: | http://dyuthi.cusat.ac.in/purl/2737 |
Files | Size |
---|---|
Dyuthi-P00371.pdf | (206.8Kb) |
Abstract: | An ultra-wideband (UWB) printed slot antenna, suitable for integration with the printed circuit board (PCB) of a wireless universal serial-bus (WUSB) dongle is presented. The design comprises a near-rectangular slot fed by a coplanar waveguide printed on a PCB of width 20 mm. The proposed design has a large bandwidth covering the 3.1-10.6 GHz UWB band, unaffected by the ground length, and omnidirectional radiation patterns. A linear phase response throughout the band further confirms its suitability for high-speed wireless connectivity. |
URI: | http://dyuthi.cusat.ac.in/purl/2723 |
Files | Size |
---|---|
Dyuthi-P00360.pdf | (240.7Kb) |
Abstract: | A compact ultra-wideband (UWB) printed slot antenna is described, suitable for integration with the printed circuit board (PCB) of a wireless, universal, serial-bus dongle. The design comprises of a near-rectangular slot fed by a coplanar waveguide (CPW) printed on a PCB of size 20 × 30 mm2. It has a large bandwidth covering the 3.1–10.6 GHz UWB band, with omnidirectional radiation patterns. Further, a notched band centered at 5.45 GHz wireless local area network bands is obtained within the wide bandwidth by inserting a narrow slot inside the tuning stub. Details of the antenna design are described, and the experimental results of the constructed prototype are presented. The time domain studies on the antenna shows a linear phase response throughout the band except at the notched frequency. The transient analysis of the antenna indicates very little pulse distortion confirming its suitability for high speed wireless connectivity. |
URI: | http://dyuthi.cusat.ac.in/purl/2719 |
Files | Size |
---|---|
Dyuthi-P00354.pdf | (401.1Kb) |
Abstract: | A simple electromagnetically coupled wideband printed microstrip antenna having a 2:1 VSWR bandwidth of 38% covering the 5.2/5.8-GHz WLAN, HIPERLAN2, and HiSWANa communication bands is presented. The large bandwidth is obtained by adding a rectangular metal strip on a slotted square microstrip antenna. The antenna occupies an overall dimension of 42 times 55 times 3.2 mm3 when printed on a substrate of dielectric constant 4. It exhibits good radiation characteristics and moderate gain in the entire operating band. Details of the design along with experimental and simulation results are presented and discussed. |
URI: | http://dyuthi.cusat.ac.in/purl/2717 |
Files | Size |
---|---|
Dyuthi-P00355.pdf | (587.6Kb) |
Abstract: | Bandwidth enhancement of a rectangular microstrip antenna using a T-shaped microstrip feed is explored in this paper. A 2:1 VSWR impedance bandwidth of 23% is achieved by employing this technique. The far-field patterns are stable across the pass band. The proposed antenna can be used conveniently in broadband communications |
URI: | http://dyuthi.cusat.ac.in/purl/1395 |
Files | Size |
---|---|
Wide band recta ... ymmetric T-Shaped feed.PDF | (731.2Kb) |
Now showing items 41-52 of 52
Dyuthi Digital Repository Copyright © 2007-2011 Cochin University of Science and Technology. Items in Dyuthi are protected by copyright, with all rights reserved, unless otherwise indicated.