A radio frequency ~rf! plasma is created at low pressure ~;1 mTorr! in the source tube of a ‘‘helicon’’ excited diffusion system in the absence of a dc magnetic field. The coupling is capacitive for the low source power of 160 W at 13.56 MHz considered here. Temperature measurements of the glass source tube yield a plasma power deposition of ;35 W. The plasma parameters ~density, potential, ele...

An effective approach to improve the detection efficiency of nanoscale light sources relies on a planar antenna configuration, which beams emitted into narrow cone. Planar antennas operate like optical Yagi-Uda antennas, where reflector and director elements are made metal films. Here we introduce investigate, both theoretically experimentally, scanning implementation antenna. Using small ensem...

Whenever a balanced antenna (i.e., dipole, loop or spiral) is used, the issue of how to feed the antenna becomes relevant. Because a balanced antenna requires a balanced feed, a balun is needed. A balanced antenna fed by a two-wire transmission line is a balanced system with respect to the lines, provided that the two feed points on the balanced antenna have the same orientation and placement w...

This paper presents the results of a new monopole antenna that exhibits 2.75-10.7 GHz performance. The proposed antenna consists of a radiating patch with notches excited by capacitive coupling feed. Also, the antenna’s truncated ground-plane incorporates a central notch. This modification significantly improves the antenna’s impedance bandwidth by 118% over an ultra-wideband frequency range. T...

This research presents an easy to fabricate isotropic printed arc antenna element be used for direction of arrival (DoA) arrays. The proposed exhibits a total gain variation 0.5 dB over the entire sphere 40 MHz impedance bandwidth at 1 GHz, which is best design isotropy reported in literature so far. In addition, ?3 225 with 86% efficiency. wire first designed and simulated Numerical Electromag...