Affiliations: Department of ECE, College of Engineering, Guindy, Anna University, Chennai, India
Correspondence:
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Corresponding author: A. Petrishia, Department of ECE, College of Engineering, Guindy, Anna University, Chennai 600025, Tamil Nadu, India. Tel.: +91 9444689919; E-mail:petrishia7@yahoo.com
Abstract: The Prolate Spheroidal Impulse Radiating Antenna (PSIRA) is used to radiate
very fast pulses in a narrow beam with low dispersion and high field
amplitude. The PSIRA is suitable to apply fast, intense pulses without
direct contact, for skin cancer treatment. In this proposed work, SWB
(Slanted Wire Biconical), EPH (Elliptical Profile Horn), TSVS (Tapered Slot
Vivaldi Shape) and Tapered Arm Conical Plate (TACP) feed antenna
configurations for Prolate Spheroidal Reflector (PSR) are explored to
enhance spatial resolution on biological targets. The feed antenna is placed
at the first focal point and the target is located at the second focal point
of the PSR. Next, the near field focusing lens is designed to enhance the
amplitude and the resolution of the wave incident at the second focus. A 10
layer Log periodic lens system is placed before the target to reduce the
spot size of the focused field on the target. The delivery of subnanosecond
pulses using reflector in conjunction with and without Log periodic lens
system on the biological target is compared for all feed antenna
configurations. Tapered Arm Conical Plate (TACP) fed PSR with the 10 layer
Log periodic lens system greatly reduces the spot size to 0.75 cm along
lateral direction and 1.5 cm along axial direction. The enhancement in
spatial resolution is very suitable to reduce the damage to healthy tissues
during cancer treatment.
Keywords: Near field focusing lens, Prolate Spheroidal Impulse Radiating Antenna, subnanosecond electric pulse, ultra wide band antenna
