Microwave conductivity measurements of high conductive polyaniline films

Rmili, Hatem; Miane, J. L.; Zangar, H.; Olinga, Thomas

doi:10.1051/epjap:2004208

Cited by 17 publications

(7 citation statements)

References 19 publications

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“…In materials with high electrical conductivity, the penetration of the electromagnetic wave is lower, and more reflection rather than absorption of the electromagnetic wave occurs. On the other hand, materials that favor deeper propagation of the wave, thickness layers, favor the formation of multiple reflections, which can annul the reflected waves and hence the material can be attenuates the incident electromagnetic radiation [7], [22], [23]. In the present work, combination of the different substrates, with the different thickness of the materials processed, in addition to the main objective, aimed towards understanding the phenomena that act on RAM, leading to an efficient absorption of radiation in the microwave range of the X-band (8 a 12 GHz).…”

Section: Resultsmentioning

confidence: 99%

Hybrid multilayer structures for use as microwave absorbing material

Folgueras

Rezende

2007

2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference

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The aim of this study is the in situ processing of flexible multilayer radar absorbing structures materials based on polymeric substrates impregnated with polyaniline conducting polymer. There is a growing interest in the development of low density flexible absorber material for applications that require the reduction of the reflectivity of targets with complex shapes and improvement of the ease of transportation of targets. Processed materials having different characteristics were evaluated for the attenuation in the X-band frequency. The results show how the characteristics of the impregnated layers influence the absorbing properties. The anchorage of absorbing centers on the substrate was evaluated and the different structures that were obtained attenuated the incident radiation from 65 to 99%, which indicates that these materials can be used as microwave absorbers.

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Section: Resultsmentioning

confidence: 99%

Hybrid multilayer structures for use as microwave absorbing material

Folgueras

Rezende

2007

2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference

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“…반사판 안테나 패널 제작에 사용되는 복합 재료는 높은 반사 특성을 가지기 때문에 식 (1)과 같은 표면 임피던스 방법을 통해 시편의 전기전도도, 를 구할 수 있다 [3]～ [5] .…”

Section: ⅱ 곡면 시편 측정법 분석unclassified

Accuracy Improvement in Measuring the Reflection Coefficient of Curved Composite Reflector Panels

Kim¹,

Lim²,

Lee³

2021

J. Korean Inst. Electromagn. Eng. Sci.

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Conventionally, to measure the electrical characteristics of a reflector antenna panel made of a composite material, a flat sample was separately manufactured with the same material as the panel or a part of the antenna panel was cut to make it flat. In this study, it was confirmed that the electrical characteristics of the curved sample can be accurately analyzed without deformation by performing measurements using an electromagnetic interference shielding foam adapter and a vertical-type measurement device. It is possible to efficiently analyze the electrical characteristics of the composite reflector panel by manufacturing a measurement device for curved panels to overcome the size limit of the vertical-type measurement device and enable measurement by angle at an arbitrary position.

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“…1. The equations describing the relationship between the reflection coefficient and propagation constant are as follows [7].…”

Section: Calculating An Algorithm For Complex Permittivitymentioning

confidence: 99%

Conductivity Evaluation of a Newly Proposed Material for a SAR Reflector Antenna

Yoon¹,

Lee²,

Lee³

et al. 2014

Journal of electromagnetic engineering and science

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Large spaceborne antennas should be lightweight, a factor related to the development costs of launch vehicles. In order to overcome this drawback, a feasibility study of a new carbon fiber reinforced polymer (CFRP) named M55J/RS3 is carried out for a synthetic aperture radar (SAR) reflector antenna. In particular, the high resolution of detected images is taken into consideration. To validate the electrical performance, a test of the CFRP specimen is fabricated, and the transmission/reflection coefficients are measured using a standard Xband waveguide. Finally, the effective complex permittivity and effective electrical conductivity are derived from the obtained measured data. By applying the derived conductivity to the simulation of the radiation pattern, antenna gain, and beamwidth-instead of relying on the assumption of a perfect electric conductor-variations in electrical performance are also investigated and discussed.

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Microwave conductivity measurements of high conductive polyaniline films

Cited by 17 publications

References 19 publications

Hybrid multilayer structures for use as microwave absorbing material

Hybrid multilayer structures for use as microwave absorbing material

Accuracy Improvement in Measuring the Reflection Coefficient of Curved Composite Reflector Panels

Conductivity Evaluation of a Newly Proposed Material for a SAR Reflector Antenna

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