Soonyong Lee

The Study on Implementation of a Semi-Solid Flat Phantom with Equivalent Electrical Properties to Whole Human Body at MICS and ISM Band

When wireless devises for MICS(Medical Implant Communication Service) or ISM(Industrial Scientific and Medical) bands are designed, it is necessary to verify the performance by using a human body flat phantom. However, most of studies on the phantom are limited to the biological effects of mobile-phone EMF. In this paper, semi-solid phantoms having the electric properties suggested by FCC at MICS and ISM bands are fabricated. The manufactured phantoms satisfy the electric properties(

Design of a Dual-Band On-Body Antenna for a Wireless Body Area Network Repeater System

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Design of a Multiband Antenna using a Planner Inverted-F Structure

A dual-band on-body antenna for a wireless body area network repeater system is proposed. The designed dual-band antenna has the maximum radiation directed toward the inside of the human body in the medical implantable communication service (MICS) band in order to collect vital information from the human body and directed toward the outside in the industrial, scientific, and medical (ISM) band to transmit that information to a monitoring system. In addition, the return loss property of the antenna is insensitive to human body effects by utilizing the epsilon negative zeroth-order resonance property.

A Compact Printed Antenna with Band-stop Characteristic for UWB Application

In this paper, a planar inverted-F antenna with wideband characteristic is proposed for GSM850/DCS1800/DCS1900/EMT200/WLAN/DMB services at the same time. The proposed antenna is composed of a main patch with a pair of slant slits and L-shaped patch and has total volume of 15 times 45 times 8 mm3. To achieve triple band operation, the length and width of a slant slit 1 on the main patch are optimized. To increase the impedance bandwidth of an antenna, the length and width of two slant slits on the main patch, which is excited by the modified CPW-fed, are changed. The length and height of an L-shaped patch between the main patch and ground plane are optimized. Measured results show that the proposed antenna provides enough bandwidth to cover six bands for return loss than -10 dB. Good broadside radiation patterns are also achieved for all six bands of interest. Measured results are presented and discussed in detail.

Design of an implantable antenna for WBAN applications

A Compact antenna with a band-stop characteristic for ultra-wideband application is proposed. To increase the impedance bandwidth of the proposed antenna, a tapered ground and circular slot are used. By attaching an inverted Y-shaped open-circuited stub in the circular ring, the band-stop characteristic is obtained. The designed antenna satisfles the voltage standing wave ratio requirement of less than 2.0 in the frequency between 3.12GHz and 10.73GHz while showing the band stop performance in the frequency band of 5.15GHz to 5.78GHz. This antenna shows an omnidirectional radiation pattern similar to that of a monopole antenna. DOI: 10.2529/PIERS060825233410

Design of an implanted compact antenna for an artificial cardiac pacemaker system

In this paper, an implantable planar inverted-F antenna (PIFA) for an artificial cardiac pacemaker is proposed. The antenna has a simple structure with a low profile and is placed on the top side of the pacemaker. The dimension of the pacemaker system, including the antenna element, is 42 mm × 43.6 mm × 11 mm. When the antenna is embedded in pig tissue, -10 dB impedance bandwidth of the antenna is 6 MHz (399 ~ 406 MHz). The proposed PIFA in tissue has a peak gain of -20.19 dBi and a radiation efficiency of 1.12 % at 403 MHz. When the proposed antenna is placed in a liquid flat phantom, its specific absorption ratio (SAR) value is 0.038 W/Kg (1 g tissue). Performances of the proposed PIFA is sufficient to operate at the MICS band (402 ~ 405 MHz).

Design of an antenna for an ingestible capsule endoscope system

An implanted compact antenna for an artificial cardiac pacemaker is proposed. The dimension of the pacemaker system, including the antenna element, is 30mm × 35mm × 7mm. When the antenna is embedded in a semi-solid flat phantom with equivalent electrical properties as the human body, S11 value is -19.2dB at 403.5MHz and the -10dB impedance bandwidth of the antenna is 10MHz (399∼409MHz). The proposed antenna in the phantom has a peak gain of -24.61dBi at 403.5MHz. The measured specific absorption ratio (SAR) value of the proposed antenna is 0.0079W/Kg (1g tissue). Moreover, to estimate the communication performance of the proposed antenna operated in the real environment, a link budget analysis is performed.

Optimization of EMC management plan for BOP(Balance of Plant) of fuel cell electric vehicle(FCEV)

In this paper, an antenna used in an ingestible capsule endoscope system is proposed. To achieve miniaturization and a wide bandwidth, an inverted-F antenna with a meandered strip line was used. The antenna performance in a human voxel model is analyzed through simulation. In order to investigate the performance of the proposed antenna in an indoor environment, a typical sickroom model is setup, and the propagation characteristics between the proposed antenna and the base station are analyzed at 1.4 GHz. The performance of the fabricated antenna is verified by comparing the measured data with that of the simulation when the antenna is placed in a human-equivalent liquid phantom.

Design of a WBAN Repeater Antenna for MICS and ISM Bands

The electromagnetic characteristics of FCEVs(fuel cell electric vehicles) are much different from the existing combustion engine cars as well as hybrid, plug-in-hybrid, and pure electric vehicles due to the high voltage/current generated by a fuel cell stack which uses a compressed hydrogen gas reacted with oxygen. To operate fuel cell stack efficiently, BOP(Balance of Plant) is essential. BOP systems are used many not only for motors in water pump, air blower, and hydrogen recycling pump but also inverters for these motors. Since these systems or components are connected by high voltage cables, EMC (Electromagneti c compatibility) management plan for the BOP systems of FCEV is the most important element to prevent the possible electric functional safety errors. In this paper, a systematic approach in applying the EMC standard for FCEV system is studied. Firstly, the analysis procedure for CE(Conducted Emission) and RE (Radiated Emission) from BOP systems is established. Subsequently, theoretical basis for applying EMC standard to BOP system is described.

HUMAN BODY WEARABLE ANTENNA HAVING DUAL BANDWIDTH

In this paper, a repeater antenna operating at MICS and ISM bands is proposed and the antenna performance including the human body effect is investigated. The proposed antenna is composed of a ZOR(Zeroth Order Resonator) and a loop antenna. A loop antenna is operated at ISM band and a loop antenna capacitively coupled with a ZOR acts as an antenna for MICS band. Simulation was carried out in order to analyze the effects of human body on antenna performance when a human body is located in the near field of an antenna. According to the simulated and measured results, the proposed antenna has -10 dB bandwidth wide enough to cover both MICS and ISM bands. The measured peak gains are -28.53 dBi and 3.85 dBi at MICS and ISM band, respectively. The dual band and radiation properties of the proposed antenna are well suited for the WBAN repeater system.