Comparison of Microstrip W-Band Detectors Based on Zero Bias Schottky-Diodes

Gutiérrez, Jaime; Zeljami, Kaoutar; Pascual, Juan Pablo; Fernández, T.; Tazón, A.

doi:10.3390/electronics8121450

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…The design of the RF-DC power detector by CST MWS is divided into three parts: diode, low pass filter, and adaptation network [26]. Figure 11 shows the block diagram of the RF-DC power detector.…”

Section: Radio Frequency-direct Current Power Detectormentioning

confidence: 99%

A novel miniaturized radiometer front-end for early breast cancer detection using ultra-wideband flexible antenna

Elouerghi,

Khomsi,

Bellarbi

et al. 2024

Bulletin EEI

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This article introduces a new design of the front-end part of a passive and miniature radiometer, which has been developed to detect breast cancer at an early stage, by measuring temperature in deep mammary tissues. The design and simulation of each element of the microwave radiometer are carried out using computer simulation technology microwave (CST MWS) software. The proposed measurement system consists of a miniaturized ultra-wideband (UWB) flexible antenna operating in the S-band (2-4 GHz), a breast phantom, a low noise amplifier (LNA), a bandpass filter, and a radio frequency (RF) power detector. These components were combined with active circuits to build the front-end system using the co-simulation modules provided by the CST MWS. The method is based on the concept that the virtually created tumor increases the temperature inside the breast phantom, and to detect the abnormality, we applied the proposed radiometer front-end on breast phantom to measure the gain variation. The results demonstrated that the design of the proposed miniaturized radiometer has promising performance in terms of stability and gain variation, indeed, the difference in maximum gain |ΔGmax| measured between abnormal and healthy phantom is about 0.92 dB at 2.75 GHz. This indicates its potential for detecting breast tumors.

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Section: Radio Frequency-direct Current Power Detectormentioning

confidence: 99%

A novel miniaturized radiometer front-end for early breast cancer detection using ultra-wideband flexible antenna

Elouerghi,

Khomsi,

Bellarbi

et al. 2024

Bulletin EEI

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show abstract

“…Another aspect is the distinction between radiometer system performance and stand-alone detector performance. Examples of detector performance can be found in [37].…”

Section: Dicke Radiometermentioning

confidence: 99%

Performance Assessment of W-Band Radiometers: Direct versus Heterodyne Detections

et al. 2021

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W-Band radiometers using intermediate frequency down-conversion (super-heterodyne) and direct detection are compared. Both receivers consist of two W-band low noise amplifiers and an 80-to-101 GHz filter, which conforms to the reception frequency band, in the front-end module. The back-end module of the first receiver comprises a subharmonic mixer, intermediate frequency (IF) amplification and a square-law detector. For direct detection, a W-Band detector replaces the mixer and the intermediate frequency detection stages. The performance of the whole receivers has been simulated requiring special techniques, based on data from the experimental characterization of each subsystem. In the super-heterodyne implementation a local oscillator at 27.1 GHz (with 8 dBm) with a x3 frequency multiplier is used, exhibiting an overall conversion gain around 48 dB, a noise figure around 4 dB, and an effective bandwidth over 10 GHz. In the direct detection scheme, slightly better noise performance is obtained, with a wider bandwidth, around 20 GHz, since there is no IF bandwidth limitation (~15 GHz), and even using the same 80-to-101 GHz filter, the detector can operate through the whole W-band. Moreover, W-band detector has higher sensitivity than the IF detector, increasing slightly the gain. In both cases, the receiver performance is characterized when a broadband noise input signal is applied. The radiometer characteristics have been obtained working as a total power radiometer and as a Dicke radiometer when an optical chopper is used to modulate the incoming signal. Combining this particular super-heterodyne or direct detection topologies and total power or Dicke modes of operation, four different cases are compared and discussed, achieving similar sensitivities, but better performances in terms of equivalent bandwidth and noise for the direct detection radiometer. It should be noted that this conclusion comes from a particular set of components, which we could consider as typical, but we cannot exclude other conclusions for different components, particularly for different mixers and detectors.

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“…As can be seen from the experimental comparison plots (Figure 4), the microstrip detector response is near flat from 108 to 110 GHz with the relative sensitivity decreasing on both sides of this interval. The performance of our detector can be further improved by using higher performance Schottky diodes from Virginia Diodes, which have lower parasitic capacitance [16]. To characterize the frequency bandwidth of the new detector, a frequency tunable (from 107 GHz to 113 GHz) microwave source from ELVA-1 was used.…”

Section: Pulse Envelope Detectormentioning

confidence: 99%

Pulse Length Monitor for Breakdown Diagnostics in THz and Mm-Wave Accelerators

et al. 2021

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The development of novel high-gradient accelerating structures operating at THz frequencies is critical for future free-electron lasers and TeV scale linear colliders. To reach high energies with reasonable length requires high accelerating gradients of ~100 MV/m. The main limitation to reaching these high-energy gradients is the vacuum RF breakdown phenomenon, which disrupts normal accelerator operations. For stable operations and to understand the breakdown microscopic dynamics, a new device capable of detecting the breakdown occurrences is required. In this paper, we provide the design of a pulse length monitor based on an analog to digital converter for fast signal digitization without the need to use high-speed digitizers to be used in a commercial mm-wave heterodyne spectrometer.

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Comparison of Microstrip W-Band Detectors Based on Zero Bias Schottky-Diodes

Cited by 6 publications

References 26 publications

A novel miniaturized radiometer front-end for early breast cancer detection using ultra-wideband flexible antenna

A novel miniaturized radiometer front-end for early breast cancer detection using ultra-wideband flexible antenna

Performance Assessment of W-Band Radiometers: Direct versus Heterodyne Detections

Pulse Length Monitor for Breakdown Diagnostics in THz and Mm-Wave Accelerators

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