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206 Papers Found. Displaying page 1 of 42:

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List of Papers:
Manuscript Title:  Hybrid Modulated Double Segmented Convex Triangular Serrations for Improved Performance of Compact Antenna Test Range Reflectors
Manuscript Id: IJMOT-2007-5-249
Abstract:  This paper presented a theoretical and numerical assessment Hybrid Modulated Double Segmented (HMDS) Convex-Triangular by changing number of serrations. Serrating the edges of a compact antenna test range (CATR) reflector is a way to realize a smooth ripple-free quiet zone. In this paper an attempt is made to analyze the HMDS convex triangular serration geometry. The investigation was based on diffraction theory and, more specifically, the Fresnel diffraction formulation. This new HMDS concept is that it is relatively simple to apply to existing reflectors. Application of serrated edges has been shown to be a good method to control diffraction at the edges of the reflectors. However, in order to get some insight into the positive effect of serrated edges a technique used known as Physical Optics (PO). Ripple free and enhanced quiet zone width are observed for specific values of width modulation factors per serration.
Authors:  T. Venkata Rama Krishna, P. Siddaiah,B. Prabhakara Rao
Category: MicrowaveTechnology:              Submitted On: 11/16/2007              Full Text  [PDF]      Pg.Nos: 1-6
Manuscript Title:  An UWB Planar Out-of-Phase Power Divider Employing Microstrip-Slot and Parallel Stripline-Microstrip Transitions
Manuscript Id: IJMOT-2006-8-214
Abstract:  The design of a planar out-of-phase power divider in microstrip/parallel stripline technology for ultra wideband (UWB) applications is presented. The device employs two substrates with a common ground plane. A coupling between two microstrip lines on the top and bottom substrate layers through a slot in the ground plane, and a suitable transition from two microstrip lines to a parallel stripline are used to achieve an UWB operation. The simulated and measured results of the proposed divider show low insertion losses, good return loss at the three ports, fine isolation and the required 180º phase difference for signals emerging from the two output ports across the band 3.1 to 10.6GHz.
Authors:  Amin M. Abbosh and M.E. Bialkowski
Category: MicrowaveTechnology:              Submitted On: 1/21/2007              Full Text  [PDF]      Pg.Nos: 87-90
Manuscript Title:  Multiband Printed Antenna for Low Frequencies and WLAN Applications
Manuscript Id: IJMOT-2006-9-222
Abstract:  A compact multi-frequency microstrip antenna suitable for mobile communication systems is presented. The structure consists of three concentric, conductively connected annular rings. The antenna is fabricated in a double dielectric layer substrate, is fed by two probes and operates in more than seven frequency ranges between 0.1 GHz and 3GHz. The design was based on the full wave theoretical analysis of the printed elements. Results obtained by simulation and measuring are presented.
Authors:  A Manassas,T Kaifas,K Siakavara
Category: MicrowaveTechnology:              Submitted On: 4/20/2007              Full Text  [PDF]      Pg.Nos: 182-186
Manuscript Title:  A Stacked Structure Broadband Circular Polarization Microstrip S-Ring Antenna
Manuscript Id: IJMOT-2006-8-207
Abstract:  A single-feed S-Ring Antenna (SRA) by stacked substrate structure for circularly polarized application was studied in this paper. The antenna is designed for Left-Hand Circular Polarization (LHCP) at a center frequency of 2.1GHz. The design of the proposed antenna is aimed at obtaining wider bandwidth and better circular polarization (CP) Axial-Ratio (AR) for Global Positioning System (GPS) applications. By a mixed stacked different dielectric substrate structure to enhance the bandwidths of the impedances and other characteristics such as including AR bandwidth, CP gains and antenna efficiency of the proposed antenna has been compared and analyzed. The experimental results verify that the antenna has an impedance bandwidth (VSWR.≦ 2) of 23.5% and a 3-dB AR bandwidth more than 23%.
Authors:  Huan-Cheng Lien, Huei-Chiou Tsai
Category: MicrowaveTechnology:              Submitted On: 11/4/2006              Full Text  [PDF]      Pg.Nos: 1-4
Manuscript Title:  Analysis of Dual Frequency Equilateral Triangular Microstrip Patch Antenna with Shorting Pin
Manuscript Id: IJMOT-2007-10-272
Abstract:  The effects of position of shorting pin and feed-probe in an equilateral triangular microstrip patch antenna are theoretically taken into account using transmission line model. At ds/dh =0.33, frequency ratio (FR) of upper resonant frequency to lower resonant frequency is minimum. It is observed that the minimum FR decreases if substrate permittivity increases and it varies from 2.81–1.68 for relative permittivity 1.0 to 9.8. While the FR increases if the distance of the shorting pin from that point (ds/dh =0.33) increases. Maximum FR is observed at the triangle tip. The maximum FR varies from 5.43–5.07, and it decreases if substrate permittivity increases. It is also observed that the resonance frequencies are almost constant with probe position.
Authors:  Reena Pant, Pradyot Kala, R. C. Saraswat, S. S. Pattnaik
Category: MicrowaveTechnology:              Submitted On: 3/31/2008              Full Text  [PDF]      Pg.Nos: 62-68
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