Basic Characteristics of the Single Layer Type Microwave Absorber in X Band Using Superconductor Powder

2006 ◽  
pp. 93-97
Author(s):  
Katsuyoshi Hotta ◽  
Hiroyuki Shimizu ◽  
Y. Watanabe ◽  
Haruo Hirose
Keyword(s):  
Single Layer ◽  
Microwave Absorber ◽  
X Band ◽  
Basic Characteristics

Basic Characteristics of the Single Layer Type Microwave Absorber in X Band Using Superconductor Powder

2006 ◽  
Vol 47 ◽  
pp. 93-97
Author(s):  
Katsuyoshi Hotta ◽  
Hiroyuki Shimizu ◽  
Y. Watanabe ◽  
Haruo Hirose
Keyword(s):  
Reflection Loss ◽  
Short Circuit ◽  
Single Layer ◽  
Liquid Nitrogen Temperature ◽  
Microwave Absorber ◽  
Complex Permeability ◽  
Theoretical Formula ◽  
X Band ◽  
Guide System ◽  
Basic Characteristics

The purpose of this study is to examine the basic characteristics of the single layer type microwave absorber in X band. Samples were produced from Bi system (2223) superconductor powder and metallic powder and inserted into a wave guide system where the complex reflection intensity was measured (The short circuit method) by using the vector network analyzer[1]. As the result, at the room temperature (300K), the reflection loss is apt to increase with increasing the content of the Bi system superconductor powder. Furthermore, the measured value of the reflection loss agreed with the value calculated from the complex permittivity εr* . At liquid nitrogen temperature (77K) where the superconductor powders are in the superconducting state, some differences occurred between the calculated value and the measured one of the reflection loss. For the metallic powders, copper powder showed good agreement between the calculated and the measured of reflection loss. For the magnetic material, it was concluded that the theoretical formula under consideration of complex permeability μr* should be derivated.

scholarly journals Investigation on the Dielectric Properties of Pulverized Oil Palm Frond and Pineapple Leaf Fiber for X-Band Microwave Absorber Application

2014 ◽  
Vol 893 ◽  
pp. 488-491 ◽  
Author(s):  
Elfarizanis Baharudin ◽  
Alyani Ismail ◽  
Adam Reda Hasan Alhawari ◽  
Edi Syams Zainudin ◽  
Dayang L.A. Majid ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Oil Palm ◽  
Microwave Absorber ◽  
Band Frequency ◽  
Pineapple Leaf Fiber ◽  
X Band ◽  
Oil Palm Frond ◽  
Palm Frond ◽  
Leaf Fiber

This paper presents the results on dielectric properties of pulverized material based on agricultural waste namely oil palm frond and pineapple leaf fiber for microwave absorber application in the X-band frequency range. The investigation is started by identifying the pulverized materials permittivities and loss tangents using coaxial probe technique, followed by density measurement comprising the determination of bulk and solid densities. Then, by using dielectric mixture model, the solid particle dielectric properties were determined. It is observed that the air properties give quite an effect on the permittivity and loss tangent of the pulverized materials. It is also found that the lower the material density the higher material dielectric constant will be. Furthermore, the results show that, both oil palm frond and pineapple leaf fiber are potential to be X-band absorber with average dielectric constant of 4.40 and 3.38 respectively. The loss tangents for both materials were observed to be more than 0.1 which mark them as lossy materials.

Bandwidth improvement of planar antennas using a single-layer metamaterial substrate for X-band application

2020 ◽  
Vol 12 (9) ◽  
pp. 906-914
Author(s):  
O. Borazjani ◽  
M. Naser-Moghadasi ◽  
J. Rashed-Mohassel ◽  
R. A. Sadeghzadeh
Keyword(s):  
Microstrip Antenna ◽  
Single Layer ◽  
Dual Band ◽  
Planar Antennas ◽  
Radiation Characteristics ◽  
Dual Band Antenna ◽  
X Band ◽  
Field Radiation ◽  
Metallic Ring ◽  
Good Agreement

AbstractTo prevent far-field radiation characteristics degradation while increasing bandwidth, an attempt has been made to design and fabricate a microstrip antenna. An electromagnetic band gap (EBG) structure, including a layer of a metallic ring on a layer of Rogers 4003C substrate, is used. For a better design, a patch antenna with and without the EBG substrate has been simulated. The results show that the bandwidth can be improved up to 1.6 GHz in X-band by adding the EBG substrate. Furthermore, using this structure, a dual-band antenna was obtained as well. Finally, to validate the simulation results, a comparison has been done between simulation data and experimental results which demonstrate good agreement.

scholarly journals A Compact Single Layer Reflectarray Antenna Based on Circular Delay-Lines for X-band Applications

2018 ◽  
Vol 27 (2) ◽  
pp. 440-447 ◽  
Author(s):  
T. Shabbir ◽  
R. Saleem ◽  
S. U. Rehman ◽  
M. F. Shafique
Keyword(s):  
Single Layer ◽  
Delay Lines ◽  
X Band ◽  
Reflectarray Antenna
Sign in / Sign up

Export Citation Format

Share Document