scholarly journals A New Approach to Estimate the Complex Relative Permittivity of Materials Based on Free-Space Reflection Method

2020 ◽  
Vol 9 (2) ◽  
pp. 19-24
Author(s):  
L. C. Nguyen ◽  
M. C. Ho ◽  
T.-H. Le
Keyword(s):  
Free Space ◽  
Relative Permittivity ◽  
Horn Antenna ◽  
Reflection Coefficients ◽  
Reflection Method ◽  
Music Algorithm ◽  
Multiple Signal Classification ◽  
X Band ◽  
Pyramidal Horn ◽  
Material Sample

A microwave free-space reflection method for determining the complex permittivity of planar materials is demonstrated. Improved the MUltiple SIgnal Classification (MUSIC) algorithm to estimate the complex relative permittivity of material based on the reflection coefficients measurement of a metal-backed material sample placed in a free-space with the thickness of the samples is the much greater time the wavelength. The measurement system consists of a pyramidal horn antenna operating at X-band and a metal-backed sample placed in a free-space. From the measured values of the reflection coefficients through a known thickness of a planar slab of the material sample, the complex relative permittivity of the material samples is estimated by the proposed algorithm without determining an integer time the wavelength in the sample under test. The proposed algorithm is verified with different thickness material samples at X-band. The estimation results show that the complex relative permittivity of material samples is accurately when thickness changes.

scholarly journals DESIGN OF X-BAND INTEGRATED FILTERING PYRAMIDAL HORN ANTENNA

2019 ◽  
Vol 82 ◽  
pp. 17-24 ◽  
Author(s):  
Yun Wang ◽  
Fu-Chang Chen ◽  
Qing-Xin Chu
Keyword(s):  
Horn Antenna ◽  
X Band ◽  
Pyramidal Horn

Fabrication of graphene-magnetite multi-granule nanocluster composites for microwave absorption application

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4097-4103
Author(s):  
Boo H An ◽  
Bum C Park ◽  
Hamad A Yassi ◽  
Ji S Lee ◽  
Jung-Rae Park ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Microwave Absorption ◽  
Free Space ◽  
Relative Permittivity ◽  
Horn Antennas ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Permittivity And Permeability ◽  
Free Space Method ◽  
Space Method

Ferrite multi-granule nanoclusters are fabricated for microwave absorption materials in different sized particles and granules by modified polyol process. Various sizes of ferrite nanoclusters are placed on graphene-based composites and the behavior of their microwave absorbing properties is studied. The absorbing properties are measured using the free-space method with two horn antennas for X-band range (8.2 GHz–12.4 GHz). Relative permittivity and permeability values are calculated in measured frequency domain. The absorption coefficient changes by forming ferrite-graphene composites are presented as well.

Design of high-gain SIW and HMSIW H-plane horn antenna using metamaterial

2014 ◽  
Vol 7 (6) ◽  
pp. 713-720 ◽  
Author(s):  
Vandana Kumari ◽  
Wriddhi Bhowmik ◽  
Shweta Srivastava
Keyword(s):  
Radiation Pattern ◽  
Relative Permeability ◽  
Excellent Agreement ◽  
Relative Permittivity ◽  
Performance Enhancement ◽  
Horn Antenna ◽  
High Gain ◽  
Unit Cell ◽  
Substrate Integrated Waveguide ◽  
X Band

In this paper, a substrate-integrated waveguide (SIW) H-plane horn antenna has been designed for X-band applications. Metamaterial is incorporated for performance enhancement of the designed antenna. Capacitively loaded loop is used as the unit cell of metamaterial for achieving negative values of relative permittivity and relative permeability. A half-mode SIW H-plane horn antenna is also proposed in this paper which reduces the size of the antenna without much effect on its performance. Metamaterial is integrated on the half-mode horn as well for improvement in gain and radiation pattern. The antennas are fabricated and tested. Excellent agreement between the measured and simulated results was obtained.

3D Printed Wideband Circularly Polarized Pyramidal Horn Antenna with Binomial Polarizer for CP-SAR Application

2020 ◽  
Author(s):  
Agus Hendra Wahyudi ◽  
Josaphat Tetuko Sri Sumantyo ◽  
Folin Oktafiani ◽  
Hardi Nusantara ◽  
Ari Sugeng Budiyanta ◽  
...  
Keyword(s):  
Horn Antenna ◽  
Circularly Polarized ◽  
Pyramidal Horn ◽  
3D Printed

scholarly journals Bearing and Range Estimation Algorithm for Buried Object in Underwater Acoustics

2009 ◽  
Vol 2009 ◽  
pp. 1-4
Author(s):  
Dong Han ◽  
Caroline Fossati ◽  
Salah Bourennane ◽  
Zineb Saidi
Keyword(s):  
Underwater Acoustics ◽  
Classical Model ◽  
Acoustic Scattering ◽  
Estimation Algorithm ◽  
Signal Classification ◽  
Music Algorithm ◽  
Range Estimation ◽  
Multiple Signal Classification ◽  
Buried Objects ◽  
Buried Object

A new algorithm which associates (Multiple Signal Classification) MUSIC with acoustic scattering model for bearing and range estimation is proposed. This algorithm takes into account the reflection and the refraction of wave in the interface of water-sediment in underwater acoustics. A new directional vector, which contains the Direction-Of-Arrival (DOA) of objects and objects-sensors distances, is used in MUSIC algorithm instead of classical model. The influence of the depth of buried objects is discussed. Finally, the numerical results are given in the case of buried cylindrical shells.

Front‐to‐back ratio improvement of a short pyramidal horn antenna using metal strips/rods in LTE/cellular band

2016 ◽  
Vol 10 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Kyoung‐Joo Lee ◽  
Soon‐Soo Oh ◽  
Young‐Hwan Lee ◽  
Young‐Sik Kim
Keyword(s):  
Horn Antenna ◽  
Pyramidal Horn

scholarly journals X-band compact dual circularly polarized isoflux antenna for nanosatellite applications

2017 ◽  
Vol 9 (7) ◽  
pp. 1509-1516 ◽  
Author(s):  
Eric Arnaud ◽  
Cyrille Menudier ◽  
Jamil Fouany ◽  
Thierry Monediere ◽  
Marc Thevenot
Keyword(s):  
Circular Polarization ◽  
Microstrip Line ◽  
Ground Plane ◽  
Axial Ratio ◽  
Horn Antenna ◽  
Azimuth Angle ◽  
Original Solution ◽  
Circularly Polarized ◽  
X Band

This paper presents an original solution to design a compact dual circularly polarized isoflux antenna for nanosatellite applications. This kind of antenna has been previously designed in our laboratory, for a single circular polarization. This antenna is composed of a dual circularly polarized feed and a choke horn antenna. This feed is a cross-shaped slot in the ground plane, which provides coupling between a patch and a ring microstrip line with two ports. It is located at the center of a choke horn antenna. The simulated antenna presents an axial ratio <3 dB and a realized gain close to 0 dB over a 400 MHz bandwidth (8.0–8.4 GHz) at the limit of coverage, i.e. 65° whatever the azimuth angle (φ) and the port. A 20 dB matching for each port and 13 dB isolation characteristics between the two ports have been achieved on this bandwidth. It has been realized and successfully measured.

A Signal Detection Method for Harmonic Signal Submerged in Complex Noise Background

2013 ◽  
Vol 397-400 ◽  
pp. 2262-2265 ◽  
Author(s):  
Ai Juan Quan ◽  
Xiao Dong Sun ◽  
Lan Xiang Zhu
Keyword(s):  
Background Noise ◽  
Detection Method ◽  
Wavelet Packet ◽  
Harmonic Signal ◽  
Chaotic Signal ◽  
Music Algorithm ◽  
Harmonic Frequency ◽  
Multiple Signal Classification ◽  
Chaotic Signals ◽  
Correlation Characteristic

This paper presents a method to detect weak harmonic signal embedded in chaotic noise. Using different correlation characteristic of harmonic and chaotic signal ,we can transform the sample signal to a new data sequence which has new harmonic . The new harmonic frequency is m times of the original harmonic and beyond the center bandwidth of noise. Then use wavelet packet decomposition to analysis the energy distribution of harmonic and chaotic signals and extract the component which the harmonic energy concentrated on, In the end, a multiple signal classification (MUSIC) algorithm is employed to estimate harmonic frequencies . The method suit for the complex background noise (strong chaotic noise and gaussian noise).

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