scholarly journals A Compact Asymmetrically Slotted Antipodal Vivaldi Antenna for MIMO Imaging Systems.

2021 ◽  
Author(s):  
Djamila ZIANI ◽  
Sidi Mohammed MERIAH ◽  
Foued DERRAZ ◽  
Lotfi MERAD
Keyword(s):  
Radiation Pattern ◽  
Time Domain ◽  
Return Loss ◽  
Imaging System ◽  
Microwave Imaging ◽  
Imaging Systems ◽  
Fractional Bandwidth ◽  
Vivaldi Antenna

Abstract In this paper, we propose a Compact Asymmetrically Slotted Antipodal Vivaldi Antenna (CAS-AVA) design for MIMO imaging systems. The structure has the ability to extend the antenna bandwidth in low-end frequencies achieving a fractional bandwidth of 123,32 % (4.743-20 GHz). Good results are obtained in term of return loss, radiation pattern and gain. A time-domain study has been also performed to characterize the antenna behavior in case of an UWB pulse is used. To further validate our design, an application for MIMO imaging system is also proposed and evaluated. The antenna performances demonstrate that it is a good candidate for microwave imaging applications.

Investigation of stimulus signals for a time domain microwave imaging system

2017 ◽  
Vol 11 (11) ◽  
pp. 1636-1643 ◽  
Author(s):  
Xuezhi Zeng ◽  
Albert Monteith ◽  
Andreas Fhager ◽  
Mikael Persson ◽  
Herbert Zirath
Keyword(s):  
Time Domain ◽  
Imaging System ◽  
Microwave Imaging

Time domain microwave imaging system for biomedical applications

2016 ◽  
Author(s):  
Xuezhi Zeng ◽  
Albert Monteith ◽  
Andreas Fhager ◽  
Mikael Persson ◽  
Herbert Zirath
Keyword(s):  
Time Domain ◽  
Biomedical Applications ◽  
Imaging System ◽  
Microwave Imaging

scholarly journals Modified Ultra Wideband (UWB) Antipodal Vivaldi Antenna for 5

2018 ◽  
Vol 8 (5) ◽  
pp. 3067
Author(s):  
Subuh Pramono ◽  
Budi Basuki S. ◽  
Tommi Hariyadi
Keyword(s):  
Return Loss ◽  
Ultra Wideband ◽  
Angular Width ◽  
Impedance Bandwidth ◽  
Fractional Bandwidth ◽  
Edge Structure ◽  
Vivaldi Antenna ◽  
Tan Δ

<p>This paper presents a half triangular Comb-shaped slits edge Antipodal Vivaldi Antenna (Comb-AVA) as compared to the conventional Antipodal Vivaldi Antenna (AVA) design. This proposed antenna covers 20-40 GHz spectrum. This Comb-AVA antenna is designed for the 5G application which is addressed to cover a dualband 28/38 GHz frequencies. A half triangular comb-shaped slits edge structure is employed to investigate its effects on antenna parameters. This proposed Comb-AVA occupies a 25x8 mm2 of FR 4 substrate (𝜀𝛾 = 4.4, tan δ=0.02, thinkness 1.6 mm). It has impedance bandwidth (S11≤-10 dB) along 20-40 GHz spectrum and fractional bandwidth (FBW) ≥0.5. It means that the bandwidth is categorized as ultra wideband (UWB). In addition, there is 11 dB refinement of return loss in the CombAVA design at 38 GHz frequency. VSWR value is in range of 1.054 to 1.396. This proposed antena also has a wider angular width (3 dB) than the AVA. Higher directivity and gain is generated by Comb-AVA at 28 GHz. This proposed antenna has good performances and suitable for 5G application. </p>

scholarly journals Recent Advances in Microwave Imaging for Breast Cancer Detection

2016 ◽  
Vol 2016 ◽  
pp. 1-26 ◽  
Author(s):  
Sollip Kwon ◽  
Seungjun Lee
Keyword(s):  
Breast Cancer ◽  
Cancer Detection ◽  
Time Domain ◽  
Breast Imaging ◽  
Imaging System ◽  
Microwave Imaging ◽  
Breast Cancer Detection ◽  
Promising Alternative ◽  
Recent Advances ◽  
Scan Time

Breast cancer is a disease that occurs most often in female cancer patients. Early detection can significantly reduce the mortality rate. Microwave breast imaging, which is noninvasive and harmless to human, offers a promising alternative method to mammography. This paper presents a review of recent advances in microwave imaging for breast cancer detection. We conclude by introducing new research on a microwave imaging system with time-domain measurement that achieves short measurement time and low system cost. In the time-domain measurement system, scan time would take less than 1 sec, and it does not require very expensive equipment such as VNA.

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