A small spiral ring antenna with the same radiation pattern as a one-wavelength loop antenna

2000 ◽  
Vol 83 (9) ◽  
pp. 10-19
Author(s):  
Hideyuki Nebiya ◽  
Nozomu Hasebe ◽  
Satoshi Nagasawa
Keyword(s):  
Radiation Pattern ◽  
Loop Antenna ◽  
Ring Antenna

scholarly journals Balanced gain for a square metaloop antenna

2019 ◽  
Vol 6 ◽  
pp. 3
Author(s):  
Hisamatsu Nakano ◽  
Ittoku Yoshino ◽  
Tomoki Abe ◽  
Junji Yamauchi
Keyword(s):  
Frequency Response ◽  
Radiation Pattern ◽  
Free Space ◽  
Loop Antenna ◽  
Circularly Polarized ◽  
Left Handed ◽  
The Difference

A square loop antenna implemented using a metamaterial line, referred to as a metaloop, is discussed. The metaloop radiates a counter circularly polarized (CP) broadside beam when the loop circumference equals one guided wavelength. The frequency response of the gain shows two different maximum values: gain G Lmax for a left-handed CP wave at frequency fGLmax and gain GRmax for a right-handed CP wave at frequency fGRmax, where GLmax is smaller than GRmax. In order to increase GLmax, while not affecting the original GRmax as much as possible (i.e. balance the gain), a parasitic natural conducting loop (paraloop), whose circumference is one free-space wavelength at fGLmax, is placed at height Hpara above the metaloop. It is found that the difference in the gains can be reduced by choosing an appropriate Hpara. The radiation pattern at fGLmax is narrowed by the paraloop, while the VSWR is not remarkably affected.

Frequency tunable monopole coupled loop antenna with broadside radiation pattern

2009 ◽  
Vol 45 (23) ◽  
pp. 1149 ◽  
Author(s):  
M. Abdallah ◽  
L. Le Coq ◽  
F. Colombel ◽  
G. Le Ray ◽  
M. Himdi
Keyword(s):  
Radiation Pattern ◽  
Loop Antenna ◽  
Frequency Tunable ◽  
Broadside Radiation

scholarly journals Ultra Wide Band Antenna with Defected Ground Plane and Microstrip Line Fed for Wi-Fi/Wi-Max/DCS/5G/Satellite Communications

2020 ◽  
Author(s):  
Ashish Singh ◽  
Krishnananda Shet ◽  
Durga Prasad
Keyword(s):  
Radiation Pattern ◽  
Satellite Communication ◽  
Ground Plane ◽  
Wide Band ◽  
Satellite Communications ◽  
Ultra Wide Band ◽  
Wireless Applications ◽  
Directional Radiation ◽  
Ring Antenna ◽  
Theoretical Results

In this chapter, ultra wide band angular ring antenna has been proposed for wireless applications. It has been observed that antenna resonate from 2.9 to 13.1 GHz which has 10.2 GHz bandwidth. Further, it is observed that antenna has nearly omni-directional radiation pattern for E and H-plane at 3.5, 5.8, and 8.5 GHz. The theoretical analysis of the proposed has been done using circuit theory analysis. It was also found using simulation that antenna has good input and output response of 0.2 ns. Proposed antenna measured, simulated, and theoretical results matches for antenna characteristics, i.e., reflection coefficient and radiation pattern. Bandwidth of antenna lies between 2.9 and 13.1 GHz, so this antenna is suitable for Wi-Fi, Wi-Max, digital communication system (DCS), satellite communication, and 5G applications.

scholarly journals Rectangular Ring Antenna Excited by Circular Disc Monopole for WiMAX System

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Souphanna Vongsack ◽  
Chuwong Phongcharoenpanich ◽  
Sompol Kosulvit ◽  
Kazuhiko Hamamoto ◽  
Toshio Wakabayashi
Keyword(s):  
Radiation Pattern ◽  
Circular Disc ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Compact Size ◽  
Ring Antenna ◽  
Parametric Studies ◽  
Simulation Results ◽  
Wimax System ◽  
Good Agreement

This research presents a rectangular ring antenna excited by a circular disc monopole (CDM) mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates good agreement between both results. The prototype antenna produces an impedance bandwidth (|S11|< −10 dB) that covers the WiMAX frequency range and a constant unidirectional radiation pattern (θ=0°and∅=90°). The minimum and maximum gains are 3.7 and 8.7 dBi, respectively. The proposed antenna is of compact size and has good unidirectional radiation performance. Thus, it is very suitable for a multitude of WiMAX applications.

Quasi-Unidirectional Radiation Pattern of Monopole Coupled Loop Antenna

2009 ◽  
Vol 8 ◽  
pp. 732-735 ◽  
Author(s):  
M. Abdallah ◽  
F. Colombel ◽  
G. Le Ray ◽  
M. Himdi
Keyword(s):  
Radiation Pattern ◽  
Loop Antenna

RADIATION FIELD OF AN ELLIPTIC LOOP ANTENNA WITH A CONSTANT CURRENT

1958 ◽  
Vol 36 (6) ◽  
pp. 672-676 ◽  
Author(s):  
S. C. Loh ◽  
J. Y. Wong
Keyword(s):  
Radiation Field ◽  
Radiation Pattern ◽  
Current Distribution ◽  
Loop Antenna ◽  
Constant Current ◽  
Elliptical Shape ◽  
Uniform Current ◽  
Uniform Current Distribution

Expressions for the radiation field are derived for a loop antenna of elliptical shape assuming a uniform current distribution. It is found that the radiation pattern in the plane of the loop depends on both the size and the shape of the antenna. However, for small loops, the radiation pattern is independent of the shape and is essentially circular. Some calculated patterns for loops of different sizes and shapes are presented in order to illustrate the derived results.

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