The Radiation Properties of a Novel Wire Antenna for the Security Fence Radar

Abstract

The radiation properties of a novel wire antenna are investigated. The main part of this antenna is a sinusoidal wire undulator, which radiates by coupling electromagnetic energy from a Goubau line located near the antenna. Far-field patterns and S-parameters composed of three sets of antenna are measured. The measured patterns are compared with the calculated ones and the phase and attenuation constants of all the antennas are calculated. Frequency behavior and the dependency on the antenna dimensions of those wave parameters are investigated. Measured and calculated field patterns are also compared with the MoM patterns and some properties of the wave propagating along structure are explained by using MoM current distributions. It is shown that a broadside transversal radiation occurs in a narrow frequency band. The radiation intensity strongly depends on the coupling distance between the Goubau line and the sinusoidal undulator. This antenna is used as the basic element of the security fence radar antenna array working at 1.25 GHz in the L-band, which detects intruders approaching the fence. The performance of the antenna in the array is investigated and the near field distribution of the array is measured. The received signals caused by an intruder are given. The effects of rain and wind are also considered. The results suggests that the security fence radar introduced in this study can be used for the perimeter control of closed areas such as airports, malls, etc.Index Terms-Border control, Goubau line, method of moments (MoM), modified or undulated wire antennas, security fence radar, sinusoidal structures, surface wave scattering.

The Millimeter Wave Radiation of a Dielectric Leaky-Wave Antenna Coupled with a Diffraction Grating: Broad-Face Interaction

“…2 However, in the proposed structure by this study, the grating has a thickness and a continuous sinusoidal form. The sinusoidal shape was also applied to the wire antennas [19,20], strip and microstrip antennas [21] before. In this study, sinusoidal shape is applied to the diffraction grating of a DLWA.…”

“…κ is called undulation ratio[20,21], which is a geometrical parameter of sinusoidal grating. It is the ratio of the peak-to-peak amplitude to the period of grating and shows how much larger the transverse dimension of the grating is than the longitudinal one.…”

The Millimeter Wave Radiation of a Dielectric Leaky-Wave Antenna Coupled with a Diffraction Grating for the Broadside Radiation: Narrow-Face Interaction

“…These differences were explained in[16] 2. The sinusoidal shape was also applied to the wire antennas[19,20], strip and microstrip antennas[21] before. By our study, sinusoidal shape is applied to the diffraction grating of a DLWA.…”

High performance metal-only fan-beam reflectarray with a delta source applicable for an electromagnetic fence

“…An electromagnetic fence [1]- [5] is a virtual fence operated by an electromagnetic wave that is unrecognizable with human eyes. Since the electromagnetic fence is physically non-existent, conceptual, and software-driven, human beings or animals can physically trespass over the fence.…”

“…In order to increase the resolution of intrusion position, we need to increase operating frequency which results in smaller wavelength. Recently, a millimeter-wave electromagnetic fence has been investigated in [5], [8]. The millimeter-wave technology has been extensively studied to build up broadband multimedia wireless communication systems [9].…”