Design and implementation of compact ultra-wideband vivaldi antenna with directors for microwave-based imaging of breast cancer

Guruswamy, Swathiga; Chinniah, Ramya; Kesavamurthy, T.

doi:10.1007/s10470-021-01859-2

Cited by 15 publications

(8 citation statements)

References 16 publications

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“…The increase in RG 00 is mainly attributed to a more focused E-field distribution along the axis of the exponentially tapered slot, improving the radiation characteristics towards desired end-fire direction. 12…”

Section: Resultsmentioning

confidence: 99%

“…The structure increases the RG 00 by 0.2−0.5 dBi for the frequency below 2 GHz and decreases the VSWR below 2 in the frequency range between 1.47 and 1.65 GHz, increasing the bandwidth by 0.18 GHz. The increase in RG 00 is mainly attributed to a more focused E‐field distribution along the axis of the exponentially tapered slot, improving the radiation characteristics towards desired end‐fire direction 12 …”

Section: Resultsmentioning

confidence: 99%

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Miniaturized tapered‐slot ultra‐wideband Vivaldi antenna for ice sounding radar

Won

Hong

Choi

et al. 2023

Micro & Optical Tech Letters

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This paper presents a novel high‐gain, miniaturized, and ultra‐wideband tapered‐slot Vivaldi antenna (TSVA) for ice‐sounding radar applications. To miniaturize the antenna and improve the impedance matching and antenna gain of conventional TSVA, tapered slot edge, circular cavity, rectangular cavity, inner circular patch, and rectangular slit structures are newly designed and introduced. The simulation results show that the size of the designed Vivaldi antenna is reduced by 15% and increases the peak realized gain by up to 5.1 dBi, compared to the conventional Vivaldi antenna. The optimized Vivaldi antenna was fabricated and characterized for its antenna performance. The simulated results are in good agreement with the measured results.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Miniaturized tapered‐slot ultra‐wideband Vivaldi antenna for ice sounding radar

Won

Hong

Choi

et al. 2023

Micro & Optical Tech Letters

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“…The measured radiation patterns are shown in Fig. 11 Finally, a comparison of the characteristics with the reference BAVA designs in [1], [9]- [12] and the recent works in [14], [27]- [30] is given in Table 3. The proposed design's complete frequency range of 13-85 GHz appears to be the broadest.…”

Section: Experimental Validationmentioning

confidence: 99%

An Optimum Design of Paired Balanced Antipodal Vivaldi Antennas With Mirror-Imaged Symmetric Architectures for Ultra-Broadband Characteristics From Microwave to Millimeter-Wave Frequency Ranges

Chou

Lin

2022

IEEE Access

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This paper presents a balanced antipodal Vivaldi antenna design to produce ultra-broadband radiations from microwave to millimeter-wave frequencies. In particular, this work relaxes the design constraints in [1] to optimize the geometrical parameters to broaden the operational frequency bandwidth, where 147% relative bandwidth has been achieved. Moreover, in this optimized design, the beam squint and cross-polarization (X-pol) discrepancy at high frequencies are improved by pairing two mirror-imaged antenna structures to form an integrated one. The resulted X-pol level can retain good performance in the entire band. The beam squint can be minimized by taking advantage of the 3dB gain increase provided by the array factor. HFSS full-wave simulations first examine the proposed work, further validated by measurement from a basic antenna prototype. The beam squint is less than 3 degrees in the major middle part of the achieved band, and the X-pol level is less than -30dB for the paired antennas.

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“…However, the numerical results show that such antenna structures can only improve the radiation characteristics at low frequencies. To achieve good radiation characteristics at high frequencies, several director structures are considered in the design, including a circular director, 20 a kind of rectangular director, 21 an exponential director, 22 a square director, 23 multilayer phase lens, 24 and hemisphere lens 25 . Furthermore, a Vivaldi antenna with length‐tapering rectangular slots and a director, 26 several radius‐tapering semicircular slots and a director VA, 27 an AVA with an elliptical director, and curved slots 28 were presented to enhance the radiation characteristics.…”

Section: Introductionmentioning

confidence: 99%

A novel Vivaldi antenna for UWB detection

Wang

Liu

Fan

et al. 2022

Micro & Optical Tech Letters

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This paper presents a modified structure of the Vivaldi antenna based on an FR4 dielectric substrate of 0.8 mm thickness and 110 mm × 96 mm dimensions for ultra-wideband (UWB) detection systems. The modified Vivaldi antenna has two major novelties. (1) Bottle-shaped slots are etched on both sides of the classic Vivaldi antenna to extend the surface current path length and concentrate electromagnetic energy. ( 2) Rectangular metal strips are implemented in front of the exponential slot to guide the UWB radiation waveform in the desired direction. The modified Vivaldi antenna is evaluated using the CST 2020 software and measured using the vector network analyzer ranging from 3 to 8 GHz. The obtained results show that a maximum peak gain of nearly 9 dBi at 4 GHz can be achieved, the radiation efficiency is improved to 80%, the main lobe level is increased, and the side lobe level is decreased. To further demonstrate the performance of the proposed Vivaldi antenna, a UWB imaging experiment is designed. The imaging results show that the imaging system using the proposed antennas can obtain images with good resolution, which indicates that the antenna has good radiation characteristics and can be used for UWB detection applications.

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Design and implementation of compact ultra-wideband vivaldi antenna with directors for microwave-based imaging of breast cancer

Cited by 15 publications

References 16 publications

Miniaturized tapered‐slot ultra‐wideband Vivaldi antenna for ice sounding radar

Miniaturized tapered‐slot ultra‐wideband Vivaldi antenna for ice sounding radar

An Optimum Design of Paired Balanced Antipodal Vivaldi Antennas With Mirror-Imaged Symmetric Architectures for Ultra-Broadband Characteristics From Microwave to Millimeter-Wave Frequency Ranges

A novel Vivaldi antenna for UWB detection

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