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A novel HF fishbone antenna with V-shape dipoles is introduced. Long V-shape dipoles instead of short linear ones are used as elements to increase the directivity. NEC-2 (Numerical Electromagnetic Code Version 2) is involved to numerically evaluate the radiation characteristics of this new fishbone antenna with two different arm lengths, 12 m and 20 m, respectively. Parameters such as open angle of...
Measurement principle and data processing method are introduced for VLF transmitting antenna efficiency evaluation. According to wave propagation theory, antenna efficiency can be calculated by using field strength measured in the groundwave-dominant range. Selection of test equipment, method to calibrate the antenna factor and directional gain of a test antenna are also introduced. The calculated...
This paper presents the results of study on the gain of plasma antenna. The plasma antenna is an annular fluorescent lamp driven either by 220 V AC source or by a RF signal source. A metallic antenna with same dimension is used as a reference. The far field strengths and VSWRs of these three antennas are measured. The gains of the plasma antennas relative to that of the reference metallic antenna...
This paper presents the investigation on a horizontally polarized HF antenna. The antenna is aimed to have small size, wideband, and high power gain. V-shape wire-structured bowtie antenna has acceptable performance in both aspects of gain and VSWR. Detailed analysis of this V-shape wire-structured bowtie antenna is carried out using Numerical Electromagnetic Code (NEC-2). The simulated results serve...
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