Balanced Antipodal Vivaldi Antenna With Dielectric Director for Near-Field Microwave Imaging

Bourqui, Jeremie; Okoniewski, M.; Fear, Elise C.

doi:10.1109/tap.2010.2048844

Cited by 356 publications

(222 citation statements)

References 21 publications

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“…The half-energy beamwidth is calculated by considering the energy on a plane perpendicular to the antenna aperture and identifying the region over which the energy is greater than half of the maximum value [13]. Antennas are defined as members of the same neighborhood if the candidate antenna and the target antenna are separated by less than twice the horizontal HEB (HEB h ) in the horizontal direction.…”

Section: Neighborhood Selectionmentioning

confidence: 99%

“…To demonstrate that the algorithm may be adapted to different antennas, two antennas are used in simulations. Models A-D are illuminated with a Wu-King resistively loaded dipole antenna [17], while Model E is illuminated with a balanced antipodal Vivaldi antenna (BAVA) [13]. Both antennas are excited with a differentiated Gaussian pulse with a full-width half-maximum bandwidth from 1.3-7.6 GHz and a center frequency of 4 GHz.…”

Section: Modelsmentioning

confidence: 99%

“…The antenna that is used in the prototype system is a BAVA-D (balanced antipodal Vivaldi antenna with director) [13]. The director is a piece of material with higher dielectric constant that is …”

Section: Prototype Systemmentioning

confidence: 99%

See 2 more Smart Citations

Neighborhood-Based Algorithm to Facilitate the Reduction of Skin Reflections in Radar-Based Microwave Imaging

Maklad¹,

Curtis²,

Fear³

et al. 2012

PIER B

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Abstract-Radar-based microwave imaging is being investigated as a complementary diagnostic tool for breast cancer detection. One of the major challenges associated with radar-based breast imaging is the removal of the overwhelming reflection caused by the skin. This paper presents an algorithm that has been designed for realistic 3D scenarios. The algorithm is tested on a variety of realistic 3D numerical breast models, as well as measured data from a phantom and patient. In all cases, the reflections from the skin are significantly reduced, facilitating detection of known tumors.

show abstract

Section: Neighborhood Selectionmentioning

confidence: 99%

Section: Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Neighborhood-Based Algorithm to Facilitate the Reduction of Skin Reflections in Radar-Based Microwave Imaging

Maklad¹,

Curtis²,

Fear³

et al. 2012

PIER B

View full text Add to dashboard Cite

show abstract

“…Some of these attempts were for a TSA enclosed in a dielectric rod for gain improvement in communications and radar systems [8]. For microwave breast cancer detection systems, a balanced antipodal Vivaldi antenna was designed with a profiled higher dielectric constant material to increase the antenna directivity [9]. Another wide band compact microstrip-fed TSA was proposed with corrugations to reduce size and improve gain [10].…”

Section: Introductionmentioning

confidence: 99%

Simulation Design and Testing of a Dielectric Embedded Tapered Slot Uwb Antenna for Breast Cancer Detection

Al-Zuhairi¹,

Gahl²,

Al-Azzawi³

et al. 2017

PIER C

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Abstract-A distortion-less ultra-wideband tapered slot antenna is designed to achieve wide band impedance matching and high gain without requiring coupling liquids. The antenna is embedded in a suitable dielectric material for compact size and performance improvement. The near-field test is simulated by placing several field probes near the antenna to plot the radiation pattern and polarization isolation. The antenna exhibits a highly directive pattern and polarization isolation in near field. The time domain antenna distortion is tested by calculating the fidelity and group delay. The results show low distortion and also show the importance of covering the antenna by dielectric layers for bandwidth increment and distortion reduction. To evaluate the antenna performance in breast cancer detection, three breast phantoms are imaged by using the raster scan imaging method. Two approaches are proposed to detect tumors without the need of breast background data. The approaches based on the effect of the tumor on transmission and reflection parameters on the frequency band allowed for medical applications. The obtained images show the antenna to be a strong candidate for breast imaging as well as in tumor detection for different scenarios that include complex multi-layer phantom and small tumor.

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“…Some printed UWB antennas have gained a lot of recognition due to their advantages of compact structure, small size and ease of integration with other RF circuits. Vivaldi antenna [1][2][3][4][5][6] has been widely studied in UWB antenna research owing to the merits of low profile, wide impedance bandwidth, moderately high gain, good directivity, benign timedomain characteristics, and symmetric beam both in E-plane and H-plane. However, Vivaldi antenna always needs a large size to achieve good performance.…”

Section: Introductionmentioning

confidence: 99%

A Printed Vivaldi Antenna With Improved Radiation Patterns by Using Two Pairs of Eye-Shaped Slots for Uwb Applications

Ma¹,

Zhao²,

Wu³

et al. 2014

PIER

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Abstract-In this paper, a printed Vivaldi antenna with two pairs of eye-shaped slots is proposed for UWB applications. By using two pairs of eye-shaped slots, the side lobe levels of the radiation pattern are reduced, and the antenna gain is improved at low frequencies. To illustrate the effectiveness of the proposed design, a prototype of the proposed antenna is fabricated and measured. Experimental results show that the proposed antenna presents a measured impedance bandwidth, defined by |S 11 | < −10 dB, from 3 to 12.8 GHz with a compact size (36 mm × 36 mm). Good unidirectional radiation characteristics with a front-to-back ratio better than 10 dB are also achieved. The measured gain is better than 3.7 dBi in the operating frequency band. In addition, the measured group delay of the proposed antenna is around 1.2 ns with a variation less than ±0.5 ns.

show abstract

Balanced Antipodal Vivaldi Antenna With Dielectric Director for Near-Field Microwave Imaging

Cited by 356 publications

References 21 publications

Neighborhood-Based Algorithm to Facilitate the Reduction of Skin Reflections in Radar-Based Microwave Imaging

Neighborhood-Based Algorithm to Facilitate the Reduction of Skin Reflections in Radar-Based Microwave Imaging

Simulation Design and Testing of a Dielectric Embedded Tapered Slot Uwb Antenna for Breast Cancer Detection

A Printed Vivaldi Antenna With Improved Radiation Patterns by Using Two Pairs of Eye-Shaped Slots for Uwb Applications

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