A Novel, Low-Profile, Vertically-Polarized UWB Antenna for WBAN

Koohestani, Mohsen; Zürcher, J. F.; Moreira, António; Skrivervik, Anja K.

doi:10.1109/tap.2014.2298886

Cited by 122 publications

(100 citation statements)

References 26 publications

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“…The omnidirectionality is defined as the gain variation (maximum to minimum) in the azimuthal plane. The wideband of omnidirectional antenna can be achieved by rational design of monopole or dipole [1][2][3], but the conformation of these antennas are rather complicated. Besides, either the gain variation is above 2dB [1][2] or the gain is less than 2dBi [3] in the horizontal plane.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Omnidirectional Dielectric Resonator Antenna Array

Liu¹,

Hu²,

Gu³

et al. 2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

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Abstract. A wideband omnidirectional dielectric resonator antenna (DRA) array has been proposed. The simulated results show that the return loss of the DRA array is less than -10dB in the frequency band of 1.61dB-2.92dB (57.8%), which can cover the 2G/3G/LTE bands simultaneously. In order to reduce the deterioration of the omnidirectionality of the DRA array, a new means to arrange the feeding coaxial cable is proposed. Based on this means, a wideband DRA array with a good omnidirectionality is designed, whose gain variation ranges from 0.11dB to 0.83dB over the operating band of 1.61GHz-2.92GHz. Besides, the maximum and minimum gain in the horizontal plane are 5.41dBi (at 2.73GHz) and 3.25dBi (at 1.61GHz), respectively. The proposed antenna in this article can be a good alternative in wireless communication systems.

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Section: Introductionmentioning

confidence: 99%

A Wideband Omnidirectional Dielectric Resonator Antenna Array

Liu¹,

Hu²,

Gu³

et al. 2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

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“…Hence, the time domain characterization is of great importance to evaluate the pulse-shaping feature of the prototyped antenna and level of distortion generated by the antenna across the utilized band. Although the time domain characterization using time domain measurements (transmitting and receiving ultrashort pulses) is faster, the characterization is performed by post-processing frequency domain measurements to time domain owing to the advantageous high dynamic range of frequency domain measurements [124].…”

Section: Time Domain Results and Discussionmentioning

confidence: 99%

“…The data from the imaging system is acquired in the frequency-domain and converted to the time-domain for post-processing. Data acquisition in the frequency-domain is preferred because of the beneficial high dynamic range of frequency-domain measurements [124]. As it is noted from Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the utilization of the maximum magnitude of the transient response's envelope of the antenna to represent its time-domain radiation capability provides limited insight [123]. On the other hand, normalizing the peak responses individually cease the opportunity of relative studies between different antennas [124].…”

Section: Near-field Time-domain Characterization Of Wideband Antennasmentioning

confidence: 99%

“…However, in this work, the characterization is performed by post-processing frequency domain measurements to time domain owing to the advantageous high dynamic range of frequency domain measurements and the flexibility of pulse selection [124]. In post-processing, the following time domain input pulse of choice is generated in MATLAB, [122].…”

Section: Near-field Transient Response and Analysismentioning

confidence: 99%

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Wideband microwave imaging system for brain injury diagnosis

Mobashsher¹

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Brain injury is a major cause of disability and mortality worldwide. This medical emergency occurs when the brain is damaged as a result of various traumatic and non-traumatic incidences including accidents, strokes, drug abuses, tumours, infections and various diseases. As the devastating disorder of brain injury deteriorates rapidly, fast diagnosis and management is critically important for the treatment and recovery of the affected patient. Therefore, on-the-spot accurate detection by means of head imaging is the governing factor of the timely medication to ensure complete recovery of the injured patient. Although some existing imaging technologies, like CT and MRI, are capable for brain injury diagnosis, they are time-consuming, expensive, bulky and mostly stationary. Thus they cannot be carried by first response paramedic teams for the diagnosis purpose or be used for monitoring the patient to observe concurrent brain injury over periods of time without moving the patient. A compact and mobile technology that can be applied to monitor the patient continuously in real time, either at the bedside or in emergency room, would be a significant advantage comparing to the existing imaging techniques. This thesis aims to develop wideband microwave imaging systems for brain injury diagnosis and in doing so makes seven main contributions to the field of microwave imaging systems.As the efficacy of the microwave imaging systems relies on the sensing antennas, emphasize is given in the developments of compact, wideband antennas with directional radiation patterns for low microwave frequencies, which is the first contribution of this thesis. Three-dimensional (3D) antennas are proposed relying on multiple folding and slot-loading techniques. Nevertheless, a novel generalized miniaturization technique is proposed for compact antennas. The antennas are found to be efficient in both near-and far-fields for both frequency-and time-domain characterizations.The second contribution is the development of artificial human head phantom with realistic heterogeneous tissue distributions and actual wideband frequency-dispersive dielectric properties.The phantom is fabricated from artificial tissue emulating materials which are contained and structured by using 3D printed structures and castes. This realistic 3D human head phantom significantly improves the reliability of the experimental validation process of wideband microwave imaging compared to the reported validations with existing simple and stylized head phantoms.The contribution third contribution is the performance comparison of directional and omni-directional antennas for wideband microwave head imaging systems. A novel near-field time-domain characterization technique is proposed that enables the comparative analysis of antennas for nearfield applications. Application of this technique demonstrates that for microwave imaging systems directional antennas are more effective than omni-directional antennas. In terms of imaging performance, it is observed that directio...

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Ultra‐wideband antenna for wearable Internet of Things devices and wireless body area network applications

Mustaqim

Khawaja

Chattha

et al. 2019

Int J Numerical Modelling

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This paper presents a compact and planar ultra‐wideband (UWB) antenna, designed and characterized for the wearable Internet of Things (IoT) devices and wireless body area network (WBAN) applications. Two different substrates, ie, FR4 (h = 1.6 mm) and denim textile substrate (h = 1 mm), are used in the process of design and fabrication of the proposed antenna. The dimensions of the proposed antenna are 31 mm × 42 mm for FR4 substrate and 70 mm × 56 mm for denim textile substrate. The antenna structure consists of a rectangular radiating patch with two symmetrical staircase‐shaped slits. A reduced ground plane technique is used for the purpose of improving impedance bandwidth, which is further enhanced by the insertion of a small notch in the reduced ground plane which has improved the overall impedance matching characteristics of the proposed UWB antenna. The measured impedance bandwidth for S11 < −10 dB and gain of the FR4 and denim textile substrate UWB antennas are 7.71 GHz/5.12 dBi and 7.95 GHz/3.57 dBi, respectively. The ADS momentum simulator is used for antenna simulations, and the simulated and measured results are generally found in good agreements.

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A Novel, Low-Profile, Vertically-Polarized UWB Antenna for WBAN

Cited by 122 publications

References 26 publications

A Wideband Omnidirectional Dielectric Resonator Antenna Array

A Wideband Omnidirectional Dielectric Resonator Antenna Array

Wideband microwave imaging system for brain injury diagnosis

Ultra‐wideband antenna for wearable Internet of Things devices and wireless body area network applications

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