Parametric Study of Pyramidal Microwave Absorber Using Rice Husk

Nornikman, H.; Malek, F.; Soh, Ping Jack; Al‐Hadi, Azremi Abdullah; Wee, F. H.; Hasnain, Ali

doi:10.2528/pier10041003

Cited by 66 publications

(40 citation statements)

References 21 publications

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“…The ratios of 75 : 25 and 50 : 50 rubber dust/rice husk mix absorber materials are found very close to the RF properties of the pure rice husk absorber [17]. However, the ratio of 25 : 75 rubber tire dust/rice husk mix absorber RF properties is dramatically different.…”

Section: Measurement Of Reflection Lossmentioning

confidence: 75%

“…For example, rice husks have been used in biomass fuels to generate power and in concrete mixtures in building construction [14][15][16]. Recently, rice husks have been investigated as potential materials for the pyramidal microwave absorbers [17]. The large percentage of carbon that occurs naturally in the rice husks has the potential to provide good reflection loss performance for the microwave absorbers [18].…”

Section: Introductionmentioning

confidence: 99%

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Rubber Tire Dust-Rice Husk Pyramidal Microwave Absorber

Malek

Cheng

Nadiah

et al. 2011

PIER

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Abstract-Rubber tire dust-rice husk is an innovation in improving the design of pyramidal microwave absorbers to be used in radio frequency (RF) anechoic chambers. An RF anechoic chamber is a shielded room covered with absorbers to eliminate unwanted reflection signals. To design the pyramidal microwave absorber, rice husk will be added to rubber tire dust since the study shows that both have high percentages of carbon. This innovative material combination will be investigated to determine the best reflectivity or reflection loss performance of pyramidal microwave absorbers. Carbon is the most important element that must be in the absorber in order to help the absorption of unwanted microwave signals. In the commercial

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Section: Measurement Of Reflection Lossmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Rubber Tire Dust-Rice Husk Pyramidal Microwave Absorber

Malek

Cheng

Nadiah

et al. 2011

PIER

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“…Figure 3 shows the simulation setup and boundary conditions used to investigate path loss. This simulation setup was based on that of a pyramidal microwave absorber [48][49][50]. The HUGO model can be used for seven different resolutions from 1 × 1 × 1 mm 3 to 8 × 8 × 8 mm 3 brick (pixel) size.…”

Section: Simulation Setupmentioning

confidence: 99%

The Use of a Human Body Model to Determine the Variation of Path Losses in the Human Body Channel in Wireless Capsule Endoscopy

Basar¹,

Malek²,

Juni³

et al. 2013

PIER

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Abstract-Presently, wireless capsule endoscopy (WCE) is the sole technology for inspecting the human gastrointestinal (GI) tract for diseases painlessly and in a non-invasive way. For the further development of WCE, the main concern is the development of a highspeed telemetry system that is capable of transmitting high-resolution images at a higher frame rate, which is also a concern in the use of conventional endoscopy. A vital task for such a high-speed telemetry system is to be able to determine the path loss and how it varies in a radio channel in order to calculate the proper link budget. The hostile nature of the human body's channel and the complex anatomical structure of the GI tract cause remarkable variations in path loss at different frequencies of the system as well as at capsule locations that have high impacts on the calculation of the link budget. This paper presents the path loss and its variation in terms of system frequency and location of the capsule. Along with the guideline about the optimum system frequency for WCE, we present the difference between the maximum and minimum path loss at different anatomical regions, which is the most important information in the link-margin setup for highly efficient telemetry systems in next-generation capsules. In order to investigate the path loss in the body's channel, a heterogeneous human body model was used, which is more comparable to the human body than a homogenous model. The finite integration technique (FIT) in Computer Simulation Technology's (CST's) Microwave Studio was used in the simulation. The path loss was analyzed in the frequency range of 100 MHz to 2450 MHz. The path loss was found to be saliently lower at frequencies below 900 MHz. The smallest loss was found around the frequency of 450 MHz, where the variation of path loss throughout the GI tract was 29 dB, with a minimum of −9 dB and a maximum of −38 dB. However, at 900 MHz, this variation was observed to be 38 dB, with a minimum of −10 dB and a maximum of −48 dB. For most positions of the capsule, the path loss increased rapidly after 900 MHz, reaching its peak at frequencies in the range of 1800 MHz to 2100 MHz. During examination of the lower esophageal region, the maximum peak observed was −84 dB at a frequency of 1760 MHz. The path loss was comparatively higher during examination of anatomically-complex regions, such as the upper intestine and the lower esophagus as compared to the less complex stomach and upper esophagus areas.

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“…The two most popular microwave absorbers that are currently on the market are Eccosorb's VHP-8-NRL absorber [17] and TDK ICT-030 absorber [18]. The following are references to others who have conducted research on microwave absorbers: Hasnain et al [19], Salleh et al [20], Yusof et al [21], Farhany et al [22], Noordin et al [23], Nornikman et al [24], Malek et al [25], and Ibrahim et al [26].…”

Section: Introductionmentioning

confidence: 99%

Development of Pyramidal Microwave Absorber Using Sugar Cane Bagasse (Scb)

Zahid¹,

Malek²,

Nornikman³

et al. 2013

PIER

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Abstract-The need to find ways to effectively utilize the large quantities of agricultural waste that are produced is indicative of the huge potential associated with producing an alternative pyramidal microwave absorber for anechoic chamber-testing applications. We propose the development of a pyramidal microwave absorber that can use sugar cane bagasse (SCB), a byproduct from the production and processing of sugar cane, as the absorbent. In this paper, we report the results of our use of dielectric probe measurement to determine the dielectric constant and loss tangent of SCB. These values were used to model and simulate an SCB pyramidal microwave absorber in Computer Simulation Technology's (CST's) Microwave Studio. This absorber was operated in the microwave frequency range between 0.1 GHz and 20.0 GHz.

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Parametric Study of Pyramidal Microwave Absorber Using Rice Husk

Cited by 66 publications

References 21 publications

Rubber Tire Dust-Rice Husk Pyramidal Microwave Absorber

Rubber Tire Dust-Rice Husk Pyramidal Microwave Absorber

The Use of a Human Body Model to Determine the Variation of Path Losses in the Human Body Channel in Wireless Capsule Endoscopy

Development of Pyramidal Microwave Absorber Using Sugar Cane Bagasse (Scb)

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