A Hyperband Antenna to Launch and Focus Fast High-Voltage Pulses Onto Biological Targets

Kumar, Prashanth; Baum, Carl E.; Altunc, Serhat; Buchenauer, J.; Xiao, Shu; Christodoulou, C.G.; Schamiloglu, E.; Schoenbach, K.H.

doi:10.1109/tmtt.2011.2114110

Cited by 38 publications

(20 citation statements)

References 13 publications

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“…The lens is designed such that all layers have the same electrical width. A 10-layer lens with a 15-cm radius was found to provide satisfactory electric enhancement [15]. Based on plane-wave approximations, scaling relationships for various electromagnetic parameters are calculated [14,16].…”

Section: Design Considerationsmentioning

confidence: 99%

Design of tapered arm impulse radiating antenna with log periodic lens system for skin cancer treatment

Petrishia

Sasikala

2014

Journal of Medical Engineering & Technology

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A Prolate-Spheroidal Impulse Radiating Antenna (PSIRA) is used as a non-invasive technique for generating an electromagnetic implosion to kill melanoma cells. It can launch and focus fast (100 ps) high voltage (>50 KV) pulses into the biological targets. It can be used to obtain electromagnetic focusing on the target to reduce the damage to the tissue layers surrounding the target (skin). The main aim of this work is to improve the gain of the antenna, enhance the electric field intensity and to reduce the spot size at the focal point. In this work the PSIRA with tapered arm is designed to increase the gain of the antenna. The log periodic lens system is designed to enhance the electric field and reduce the spot size. The IRA with tapered arms located at the position of φ = 60° gives a gain improvement of 14.28% when compared to a traditional IRA. In this work a 10-layer dielectric lens system is designed to match the 100 ps pulses to the skin phantom. Simulation results show that the electric field is increased by a factor of 2. The spot size is reduced from 1 cm to 0.75 cm at the focal point where the target is placed. The proposed Log periodic lens system provides an increase in electric field amplitude and reduction in spot size.

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Section: Design Considerationsmentioning

confidence: 99%

Design of tapered arm impulse radiating antenna with log periodic lens system for skin cancer treatment

Petrishia

Sasikala

2014

Journal of Medical Engineering & Technology

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“…While Antenna Configuration I relies on the partially lossy lens to achieve maximum side transmission of electromagnetic waves, the actual lens construction may be difficult, although the lossless lenses have been fabricated and tested [5]. A second delivery concept was therefore developed and shown in Fig.4a.…”

Section: Possible Approach To Improve the Focusing: Antenna Confimentioning

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%

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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“…The impulse-radiating antennas (IRAs) have many applications in electromagnetic compatibility/electromagnetic interference (EMC/EMI) [1][2][3], ultra-wideband (UWB) communications [4][5][6][7][8][9][10][11], target detection and identification [12][13][14], medical therapies and imaging [15][16][17][18], etc. The paraboloidal reflector has been commonly used as an optical focusing device in the IRAs [1].…”

Section: Introductionmentioning

confidence: 99%

A Time-Domain Approach for the Fast Design of Reflector Impulse-Radiating Antennas

Chen¹,

Feng²,

Chang³

et al. 2013

PIER

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Abstract-It is difficult to determine the feed radiation center and F/D of the reflector impulse-radiating antenna (IRA) in frequencydomain, due to its ultra-wideband (UWB) property. This paper presents an efficient approach to design the reflector IRAs, via evaluating the transient radiation patterns (TRPs) of the feed for some given different radiation centers. Only one time-domain simulation for the feed is needed in this method. Comparing with the global optimization algorithms, our method is fast and reliable in the design of the reflector IRAs.

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A Hyperband Antenna to Launch and Focus Fast High-Voltage Pulses Onto Biological Targets

Cited by 38 publications

References 13 publications

Design of tapered arm impulse radiating antenna with log periodic lens system for skin cancer treatment

Design of tapered arm impulse radiating antenna with log periodic lens system for skin cancer treatment

Simulation of delivery of subnanosecond electric pulses into biological tissues

A Time-Domain Approach for the Fast Design of Reflector Impulse-Radiating Antennas

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