A Twin Spiral Planar Antenna for UWB Medical Radars

Zito, Giuseppe; Staderini, Enrico M.; Pisa, Stefano

doi:10.1155/2013/684185

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…For wearable radar systems, a high directivity in a direction perpendicular to the maximum size of the antenna is necessary. A novel small-size directional twin cross-polarized planar spiral antenna, consisting of two twin spiral antennas rotated by 180 to each other on the same plane, one for transmission and the other for reception, has been developed [58].…”

Section: Antenna and Em Wave Coupling Mechanismsmentioning

confidence: 99%

Technical Considerations in Medical Radar

Narayanan¹

2013

Proceedings of the 8th International Conference on Body Area Networks

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Medical radar is an emerging area of research and development in recent years, spurred by rapid advances in electromagnetic modeling, simulation, component development, and signal and image processing algorithms. In this paper, we review various important considerations in the design and development of medical radar systems for diagnostic applications.Most medical radar applications basically need two components: a sensor and a communication infrastructure (transceiver and protocols) to share the data gathered by the former [7]. By combining sensing and communications in the same package, UWB radar could be used to measure vital signs information, and UWB communication standards could be used to transmit these measurements to a processor. Wireless networking is necessary to transmit and share the monitored data with a central repository.It is important to ascertain which phenomenon actually impacts measured data. It was shown that body surface movements dominated remote radar measurements of heartbeat, compared to blood perfusion in the skin or internal body organ movements [8].A comprehensive list of relevant literature on medical radar is presented in [9], which includes references on general UWB radar, radar calibration, radar heartbeat and respiration measurements, medical radar systems, and medical radar imaging. DIELECTRIC PROPERTIES OF TISSUEThe dielectric properties of human tissue determine the radar reflections from different layers. Relevant data are available from several papers and reports over the past 60 years.Some of the earliest permittivity and loss measurements of various human tissues, such as skin, fat, muscle, etc. were made at centimeter wavelengths, over the 1-26 GHz frequency range [10]-

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Section: Antenna and Em Wave Coupling Mechanismsmentioning

confidence: 99%

Technical Considerations in Medical Radar

Narayanan¹

2013

Proceedings of the 8th International Conference on Body Area Networks

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“…This system was used to determine the apnea phenomenon of infants, in which an alarm was turned on when the apnea lasted more than 30 s. Their recommended distance from human to antennae was around 50 cm. After that, many studies tried to improve the quality of the vital signs’ sensing system by improving hardware structures and signal processing techniques [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44].…”

Section: Introductionmentioning

confidence: 99%

Review-Microwave Radar Sensing Systems for Search and Rescue Purposes

Van

Tang

Demir

et al. 2019

Sensors

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This paper presents a survey of recent developments using Doppler radar sensor in searching and locating an alive person under debris or behind a wall. Locating a human and detecting the vital signs such as breathing rate and heartbeat using a microwave sensor is a non-invasive technique. Recently, many hardware structures, signal processing approaches, and integrated systems have been introduced by researchers in this field. The purpose is to enhance the accuracy of vital signs’ detection and location detection and reduce energy consumption. This work concentrates on the representative research on sensing systems that can find alive people under rubble when an earthquake or other disasters occur. In this paper, various operating principles and system architectures for finding survivors using the microwave radar sensors are reviewed. A comparison between these systems is also discussed.

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“…Despite their benefits, equiangular spiral antennas are high profile and have low gain across the intended polarisation mode. Many attempts have been made to enhance spiral antenna characteristics such as antenna gain [3][4][5][6][7][8][9][10][11][12][13], circular polarisation (CP) [3,8,[10][11][12][13][14][15][16][17] and reduction of physical size [12,18,19]. Bidirectional radiation pattern can be changed to unidirectional by employing a reflector.…”

Section: Introductionmentioning

confidence: 99%

Improved spiral antenna with a new semi‐fractal reflector for short‐range sensing

Ranjbaran

Mohanna

2018

IET Microwaves, Antennas & Propagation

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An improved meandered spiral antenna with a new semi‐fractal reflector is designed and fabricated. It is considered as a unidirectional circular polarised broadband antenna having high gain. To improve the impedance bandwidth, the top layer of the antenna is shaped as equiangular Archimedean lines which its outer area meanders. The reflector consists of many fractal hexagonal shape cells. It is implemented at the back of the spiral antenna in order to improve the gain and circular polarisation. The simulated and measured results indicated that the antenna covers the impedance bandwidth of 446% within the frequency region of 0.8–4.37 GHz having the gain of 7.5–13 dBiC. The antenna is designed to be employed in positioning and short‐range sensing systems.

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A Twin Spiral Planar Antenna for UWB Medical Radars

Cited by 10 publications

References 14 publications

Technical Considerations in Medical Radar

Technical Considerations in Medical Radar

Review-Microwave Radar Sensing Systems for Search and Rescue Purposes

Improved spiral antenna with a new semi‐fractal reflector for short‐range sensing

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