Design of leaky coaxial cables with periodic slots

Wang, Jun Hong; Mei, K.K.

doi:10.1029/2000rs002534

Cited by 14 publications

(8 citation statements)

References 15 publications

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“…The electrical characteristics of LCX mainly include characteristic impedance, working frequency, attenuation constant, and coupling loss …”

Section: Methodsmentioning

confidence: 99%

“…The electrical characteristics of LCX mainly include characteristic impedance, working frequency, attenuation constant, and coupling loss. 12 The attenuation constant indicates the electromagnetic energy which lost in the LCX during the transmission, and it is closely related to the dielectric constant of the insulation material. Defined as A5a c 1a d 1a r , attenuation constant A includes conductor attenuation a c , isolation material attenuation a d and radiation attenuation a r , where a r is caused by the leaky radiation through the slotted outer conductor.…”

Section: Theories Analyses Of Lcx Sensormentioning

confidence: 99%

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A novel sensor using VHF zigzag‐slotted leaky coaxial cable for intruder localization

Qiao

Chen

2018

Micro & Optical Tech Letters

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The sensors used in the field of traditional security warfare are often constrained by environmental factors such as weather, light and terrain. In order to solve this problem, a new perimeter intrusion detection system sensor is urgently needed. Based on the theory of the array antenna, leaky coaxial cable (LCX) with periodic zigzag‐slotted outer conductor is designed, its coupling loss is simulated by the software Ansoft HFSS. For evaluating the coupling loss of the LCX comprehensively, the LCX is simulated and measured in four directions, the measured results of coupling loss are 64.1 dB, 62.6 dB, 64.3 dB, 57.2 dB in rotary, horizontal, vertical, and radial direction, respectively. With the research on LCX wireless sensing techniques, a novel LCX sensor is designed and a new approach of localization is put forward. When the intruder enters into the surveillance, the proposed LCX sensor can achieve to detect and locate the intruder by emitting the LFM pulse signal whose working frequency is in VHF, pulse compression is used to improve the detection performance of the intrusion detection system (IDS). The positioning accuracy of the IDS is within 0.8 m, and the range distance is 6.64 m.

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“…The electrical characteristics of LCX mainly include characteristic impedance, working frequency, attenuation constant, and coupling loss …”

Section: Methodsmentioning

confidence: 99%

Section: Theories Analyses Of Lcx Sensormentioning

confidence: 99%

A novel sensor using VHF zigzag‐slotted leaky coaxial cable for intruder localization

Qiao

Chen

2018

Micro & Optical Tech Letters

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“…In order to avoid the radiation caused by the corrugation, the period of the corrugation must satisfy the nonradiation equation [8,9] p Յ c f͑ ͱ re ϩ 1͒…”

Section: Theorymentioning

confidence: 99%

Velocity compensated coplanar wave guide bend for odd‐mode suppression

Wang

Zhang

2008

Micro & Optical Tech Letters

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A kind of velocity compensated coplanar wave guide (CPW) bend is proposed, in which one slot of CPW bend with shorter length is corrugated, so that the signal propagating in this slot is slowed down, and the signal propagating in the longer slot can catch up with the signal in the shorter slot. Both simulated and experimental results show that the odd mode can be suppressed efficiently by this kind of CPW bend, and the properties of reflection and transmission are improved significantly, especially in high‐frequency band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1201–1204, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23315

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“…However, the IDS based on LCX sensor has completely different characteristics. The apertures on the LCX are similar to the array antennas, 8,9 which builds a wide-belt flexible detection area instead of the area of directional beam. The closer the distance between the aperture and the intruder, the more obvious reflection effect the aperture provides.…”

Section: Introductionmentioning

confidence: 99%

Research on human intruder detection and localization based on LCX sensor

Qiao

Lü

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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Many aspects of the intruder detection system (IDS) based on the LCX sensor are still unknown due to its complex propagation characteristics. In order to study the field disturbance mechanism of human intruder and to reduce the phase error caused by the initial state of the detection signal, a novel method of improving the localization accuracy is proposed. At the frequencies of 40, 100, and 200 MHz, the IDS based on the LCX sensor is proposed by analyzing the scattering characteristics of the radar cross section (RCS) of human intruder and using IQ demodulation method. According to the characteristics of the IDS, the RCS is obtained by irradiating the human intruder from three typical radiation directions, which are front, side, and low-side direction in the mentioned frequency range. Combined with the method of pulse accumulation and synchronous subtraction, the intruder localization can be easily realized by using pulse delay positioning method. The results demonstrate the improvement in localization accuracy and the decrement in false positive rate, and the positioning error is less than 1 m.intruder detection, LCX sensor, localization, pulse accumulation, synchronous subtraction, phase errorAs a kind of receiving and emitting device, leaky coaxial cable (LCX) has been intensively used for various application scenarios, such as tunnel, railway, indoor communication, and positioning localization system. 1-5 The perimeter intrusion detection system (IDS) based on the LCX sensor has been widely studied because of its better concealment, flexible installation, and all-weather conditions work. 6,7 The ordinary localization systems usually detect the target in the area of directional beam of the systems' antennas.However, the IDS based on LCX sensor has completely different characteristics. The apertures on the LCX are similar to the array antennas, 8,9 which builds a wide-belt flexible detection area instead of the area of directional beam. The closer the distance between the aperture and the intruder, the more obvious reflection effect the aperture provides. The IDS can avoid the influence of the environment and the terrain. Because most of the power is transmitted in the LCX sensor, the IDS can reach a far distance to achieve the security guarding with the small attenuation in a specific area.Although some IDS based on LCX sensor have been applied, on the one hand, there are few articles discussing the theoretical analysis or mathematical calculation of the electromagnetic disturbance mechanism of the human intruders; on the other hand, with the development of science and technology, there is an urgent need to deal with the IQ-demodulation echo signal with the new method. Based on the results of radar cross section (RCS) calculations, the disturbing mechanism of human intruder is analyzed in this article. The experiments in time-domain and frequency-domain echo signals are carried out in the radiation mode and coupling mode. Moreover, the experiment of the signal receiver unit of IDS is conducted by means of the...

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Design of leaky coaxial cables with periodic slots

Cited by 14 publications

References 15 publications

A novel sensor using VHF zigzag‐slotted leaky coaxial cable for intruder localization

A novel sensor using VHF zigzag‐slotted leaky coaxial cable for intruder localization

Velocity compensated coplanar wave guide bend for odd‐mode suppression

Research on human intruder detection and localization based on LCX sensor

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