Design of a special dielectric lens for concentrating a subnanosecond electromagnetic pulse on a biological target

Altunc, Serhat; Baum, Carl E.; Buchenauer, C.J.; Christodoulou, C.G.; Schamiloglu, E.

doi:10.1109/tdei.2009.5293950

Cited by 25 publications

(12 citation statements)

References 7 publications

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“…These two factors led us to design an inhomogeneous, partially lossy dielectric lens. In the previous paper [4], a multilayer dielectric lens was used to match the impedance from air to tissue. The lens consists of five layers of different dielectric materials with dielectric constants varying in an exponential profile from air to the innermost layer, H rmax .…”

Section: Possible Approach To Improve the Focusing: Antenna Confmentioning

confidence: 99%

“…The lossy materials only fill in the last two layers from the azimuth angle (T) -45q to 45q. In the meantime, the dielectric constants of the materials were kept same as in the previous lens design [4].…”

Section: Possible Approach To Improve the Focusing: Antenna Confmentioning

confidence: 99%

“…For a target that has a higher dielectric constant, the focal spot size should be smaller. A dielectric lens was designed to work in conjunction with the antenna [4,5], providing an impedance matching from free space to tissue and allowing a maximum power transmission. In this paper, we discuss some designs for the delivery of subnanosecond pulses to tissue.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of delivery of subnanosecond electric pulses into biological tissues

Xiao

Guo

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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Delivery of subnanosecond pulses into biological tissue can be undertaken by an impulse radiating antenna (IRA). Previous analysis shows that it is important to add a dielectric lens, which reduces the abrupt change of dielectric constant from air to tissue and therefore increases the transmission of the pulses. As a proof of concept, we have simulated subnanosecond pulsed radiation focused into a tissue simulant which consists of homogeneous, hemisphere tissues using 3-D electromagnetic solver, CST Microwave Studio. The simulation of an IRA in conjunction of a lens indicates subnanosecond pulses can be focused 6 cm below tissue surface with a spot diameter approximately 1 cm. The focal point coincides with the geometric focus of the IRA. However, this result is only valid for a tissue with a low conductivity (V< 0.3 S/m). For lossier tissues, the electric field decreases from the surface monotonically as the subnanosecond pulses penetrate in depth. Two approaches were proposed to solve this problem. One was to use an inhomogeneous dielectric lens, with lossy material partially filled, to attenuate the incident field in the small azimuthal angles but to spare the field in the larger azimuthal angels. A desirable focusing was observed. The second approach was to use a dipole antenna in conjunction with the impulse radiating antenna. The dipole antenna decreases the surface field intensity generated by the aperture antenna, but at the destination, the field will be mostly given by the aperture antenna, resulting in a focusing.

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Section: Possible Approach To Improve the Focusing: Antenna Confmentioning

confidence: 99%

Section: Possible Approach To Improve the Focusing: Antenna Confmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of delivery of subnanosecond electric pulses into biological tissues

Xiao

Guo

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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“…The lens consists of multiple layers of dielectric material in an exponential profile. The use of a focusing lens before the second focal point also eliminates the impedance mismatch between air and the target and provides a higher transmission [10].…”

Section: B Antenna With Dielectric Lensmentioning

confidence: 99%

Target detection in the near field with focused pulsed electromagnetic radiation

Bajracharya

Schoenbach

2010

2010 IEEE International Power Modulator and High Voltage Conference

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The prolate spheroidal reflector antenna focuses pulsed radiation in the near field with a small beam-width, allowing for applications such as target detection. We have investigated the use of two identical antennas for signal transmitting and receiving to detect a moving target behind obstacles, such as human movement behind a wall. The coverage area was found to be 10 m u u 7 m. We have also investigated the use of the focusing antenna in a confocal configuration for the detection of stationary targets. We show that decreasing the focal spot size by adding a dielectric lens enables us to resolve targets smaller than diffraction limit.

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“…The high frequency matching (hundreds of MHz) can be also more difficult due to the occurrence of biosample dielectric losses. Reflector antennas would be too big for the planned experiments [11], while TEM cells are inefficient to get high E field intensity inside the mouse body [12,13].…”

Section: Introductionmentioning

confidence: 99%

Design of an Applicator for nsPEF Exposure of Newborn Mice

et al. 2016

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Abstract-This paper proposes the design of a new in vivo applicator of nsPEFs suitable for whole body exposure of several newborn mice. The system is based on a UWB patch antenna and exhibits a wide operating band (300-1100 MHz).To improve the system efficiency, a dielectric box, with permittivity similar to that of the mouse has been used as sample holder, placed on the antenna and completely covering it. The system shows a good efficiency and acceptable homogeneity within the samples.Keywords-nsPEF applicator, new born mice, dosimetry, broad-band device.

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Design of a special dielectric lens for concentrating a subnanosecond electromagnetic pulse on a biological target

Cited by 25 publications

References 7 publications

Simulation of delivery of subnanosecond electric pulses into biological tissues

Simulation of delivery of subnanosecond electric pulses into biological tissues

Target detection in the near field with focused pulsed electromagnetic radiation

Design of an Applicator for nsPEF Exposure of Newborn Mice

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