scholarly journals Near-field Radiation Patterns for an Ultra-Wide-Band Antenna

2013 ◽  
Author(s):  
J. Blackledge ◽  
B. Babajanov
Keyword(s):  
Near Field ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Radiation Patterns ◽  
Field Radiation

Ultra-Wide Band Near-Field Imaging System

2007 ◽  
Author(s):  
Anatoliy O. Boryssenko ◽  
Christophe Craeye ◽  
Daniel H. Schaubert
Keyword(s):  
Imaging System ◽  
Near Field ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Near Field Imaging ◽  
Field Imaging

scholarly journals A Novel Compact Microstrip UWB Rectangular Stair Slot Antenna for the Analysis of Return Losses

2019 ◽  
Vol 8 (10) ◽  
pp. 4597-4603 ◽  
Keyword(s):  
Return Loss ◽  
Wide Band ◽  
Directional Pattern ◽  
Slot Antenna ◽  
Ultra Wide Band ◽  
Radiation Patterns ◽  
Uwb Antenna ◽  
Antenna Performance ◽  
Ansoft Hfss ◽  
Radiation Behavior

This article deals with the various designs of a novel compact microstrip fed UWB antenna to investigate the corresponding return losses of different structures. The dimension of the designed antenna is 33 x 19 x 1.9 mm3 with FR4 substrate and it can be operated from 2.846 - 11.7458 GHz. The effects of varying the structure of antenna are to exhibit the investigation of corresponding return losses. Different structures of antenna are simulated in Ansoft HFSS simulator. The results of return losses and radiation patterns are explored with the ultra wide band (UWB) rectangular Stair slot antenna. The modified structure of antenna shows the minimized return loss with an enhanced bandwidth that satisfies good UWB characteristics. Antenna performance can also be explored from the radiation behavior of the antenna which is relatively omni-directional pattern for rectangular Stair slot antenna

scholarly journals A New Impedance Matching Method for an Ultra-Wide Band and Dual Circularly Polarised Feed

2016 ◽  
Vol 33 ◽  
Author(s):  
Sha Li ◽  
Yi Hua Yan ◽  
Wei Wang ◽  
Zhi Jun Chen ◽  
Dong Hao Liu ◽  
...  
Keyword(s):  
High Frequency ◽  
Near Field ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Wide Band ◽  
Beam Width ◽  
Metal Ring ◽  
Field Radiation ◽  
Fixed Phase ◽  
Strip Lines

AbstractIn traditional antenna design, metal components are not placed in the central part of the antenna as they change the characteristics of near field radiation. However, we show that placing a metal ring in the centre of the strip lines, which connect the ends of folded high-frequency dipoles, does not damage the performance of the feed. Instead it significantly improves the voltage standing wave ratio of the feed whilst other performance indicators are not compromised. Thus, our findings show an excellent way of improving the wide band feed. Based on this foundation, a new circularly polarised feed for operation between 0.4 to 2 GHz is introduced for the Chinese Spectral Radioheliograph in this paper. The issue of a feed impedance matching network is investigated. By optimising the impedance matching, the performance of the feed is enhanced with respect to the previous realisations of the Eleven feed. The simulation and experimental results show that the gain of the feed is about 10 dBi, and the VSWR is less than 2:1. In addition, the feed has a low axial ratio, fixed phase centre location, and constant beam width in the range of 0.4 to 2 GHz.

Compact Ultra-Wideband Slot Antenna with Dual Band Rejection by Using H-Shape Notch

2019 ◽  
Vol 16 (2) ◽  
pp. 687-690
Author(s):  
T. K. Thivakaran ◽  
A. Sivabalan
Keyword(s):  
Satellite Communication ◽  
Wide Band ◽  
Ultra Wideband ◽  
Dual Band ◽  
Slot Antenna ◽  
Ultra Wide Band ◽  
Radiation Patterns ◽  
Band Frequency ◽  
Rectangular Patch ◽  
Communication Space

The main objective is to design a dual band rejection micro strip patch antenna. In this antenna, H-shaped slots are made in the patch to achieve notched characteristics at two licensed band employed for Wimax and WLAN band. The above mentioned frequency ranges are licensed for WLAN and satellite communication applications. These antennas maintain the Omni-directional radiation patterns and are mostly suited for ultra wide band applications. For wide band operation, the shape of patch has been altered to octagonal just by chamfering the corners of the rectangular patch. The antenna parameters like radiation patterns, VSWR, reflection loss have been described clearly in this section. Radar applications, terrestrial networking and communication, space communications are some of the applications in this ultra wide band frequency range.

scholarly journals A Novel Wideband Magneto-Electric Dipole Antenna with Improved Feeding Structure

2016 ◽  
Vol 5 (2) ◽  
pp. 10
Author(s):  
N. Marwah ◽  
G. P. Pandey ◽  
V. T. ◽  
S. S. Marwah
Keyword(s):  
Radiation Pattern ◽  
Electric Dipole ◽  
Wide Band ◽  
Dipole Antenna ◽  
Ultra Wide Band ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Radiation Patterns ◽  
Feeding Structure

A novel feeding structure in magneto-electric dipole antenna is proposed and analyzed, which is simpler and better in performance than previous designs, involving differential feeding.  Due to this improved feeding structure, the antenna has achieved an impedance bandwidth of 133.3% ( 0.5 GHz – 2.5 GHz, resulting into an ultra-wide band antenna. The maximum broadside gain 7.5dBi with unidirectional radiation pattern has also been reported for the entire the range of operation. Symmetry in E-plane and H-plane radiation patterns has been observed due to the symmetry in structure and excitation of antenna. The antenna has also been able to achieve cross polarization levels.

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