Two-frequency surveillance technique for intrusion-detection sensor with Leaky Coaxial Cables

Inomata, Kenji; Tsujita, Wataru; Hirai, Takashi

doi:10.1109/sas.2014.6798926

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The radio signal is transmitted and received along the cable. For a periodic structure considering radiating mode, the electric field around the LWC can be written as [19]:…”

Section: Rationale Of Using Leaky Wave Cablementioning

confidence: 99%

Freezing of Gait Detection Considering Leaky Wave Cable

Yang

Shah

Ren

et al. 2019

IEEE Trans. Antennas Propagat.

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A novel study on monitoring and analysis of debilitating condition of patients suffering from neurological disorder is presented. Parkinson's disease is characterized by limited motor-ability of a patient. Freezing-of-gait is a major non-motor condition among ageing patients and its evaluation can reduce the chances of any secondary disorders. In this work, amplitude and phase information of the radio signals observed for a fixed period of time are used to differentiate the motor and non-motor symptoms. The amplitude information is classified using support vector machine while linear transformation is applied to obtain sanitized phase information for detection. The proposed method is highly cost effective and very handy with minimum deployment overhead. The analysis shows that this method also offers a high accuracy level of around 99% based on the observation of a number of patients. These features make it an attractive solution for real-time patient monitoring systems.

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“…The radio signal is transmitted and received along the cable. For a periodic structure considering radiating mode, the electric field around the LWC can be written as [19]:…”

Section: Rationale Of Using Leaky Wave Cablementioning

confidence: 99%

Freezing of Gait Detection Considering Leaky Wave Cable

Yang

Shah

Ren

et al. 2019

IEEE Trans. Antennas Propagat.

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“…The range of pitch is P ∈ [P Min , P Max ], where P Min = 157 mm, P Max = 314 mm. When the pitch P < P min , the LCX is in the surface wave mode [13]. P min < P < P Max , and the LCX is in the −1st radiation mode with the radiation direction θ −1 .…”

Section: Demonstration Examples Of Circular Polarization For Lcxmentioning

confidence: 99%

A Study of Designing Circular Polarization for Leaky Coaxial Cable at 900 MHZ

Qiao¹,

Chen²,

Song³

2018

PIER Letters

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Widely applied in confined areas communication, leaky coaxial cable (LCX) is used as an antenna to provide communication services for mobile devices. In order to improve the quality of mobile communication in narrow and long spaces such as subway or tunnel, the method of designing LCX with circular polarization radiation property is proposed, which consists of aperture's design, circular polarization simulation verification and coupling loss test. Firstly, the regular circumferential asymmetry apertures are designed and slotted in the outer conductor of the LCX to achieve radiating ϕ component of the electric field, and the optimized size of the aperture for achieving circular polarization is obtained by the simulation results from Ansoft HFSS. Then, the circular polarization characteristics in the maximum radiation direction are obtained. Further, the relation between it and the gain of the optimized aperture is analyzed. Finally, the coupling loss is calculated for evaluating the performance of the LCX. The simulation results show that the two designed LCXs have the circumferential circular polarization range of 30 ∼ 70 deg in the maximum radiation direction at 900 MHz, and the range is twice of the conventional LCX. The coupling loss indicator also meets the requirements.

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“…The LCXs have two types of emitting modes which are surface mode and radiating mode. The waves exist around the LCX in emitting mode and the waves radiate in far field only in radiating mode [16]. On the basis of cylindrical Fourier transforms of and , we can find the distribution of the electric field due to the slot on the outer conductor of LCX [9] as shown in Figure 2.…”

Section: Radiated Field Of Slotmentioning

confidence: 99%

Scattering of Electric Field from Leaky Coaxial Cable in Confined Area

Saleem

Wang

Zheng

2017

International Journal of Antennas and Propagation

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The new radiation model for the electric field scattering of single leaky coaxial cable (LCX) being a transmitting antenna in the rectangular blind zone at 1.8 GHz is reported. The effect of varying the receiving antenna distance from the LCX on the fluctuation of radiated field using Ray-Tracing Method is examined. The line of sight and reflected paths between the LCX and receiving antenna for both horizontal and vertical polarizations are considered. Furthermore, it is inferred that the selection of appropriate period of slots and distance of the receiver reduce the fluctuations of electric field. The theory and procedures used in this paper can be extrapolated in different slot patterns of the LCX and zones which have many valuable applications for mobile communication in underground mines, tunnels, and railways.

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Two-frequency surveillance technique for intrusion-detection sensor with Leaky Coaxial Cables

Cited by 7 publications

References 7 publications

Freezing of Gait Detection Considering Leaky Wave Cable

Freezing of Gait Detection Considering Leaky Wave Cable

A Study of Designing Circular Polarization for Leaky Coaxial Cable at 900 MHZ

Scattering of Electric Field from Leaky Coaxial Cable in Confined Area

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