A GaAs Power Detector Design for $C$ -Band Wideband Complex Cross Correlation Measurement

Chen, Chen; Mehdi, Ghulam; Wang, Chao; Dilshad, Umar; Hu, Anyong; Miao, Jungang

doi:10.1109/tim.2019.2957894

Cited by 14 publications

(10 citation statements)

References 36 publications

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“…An ideal analog correlator is usually used to measure the phase difference between two input signals. In our previous work [19,20], the analog complex correlator based on the six-port technology has been applied in the passive imaging system for security applications. Assuming the inputs are two single-frequency signals S 1 (t) and S 2 (t), which can be presented as…”

Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

“…After the signal distribution network, zero-biased square-law detector and LPF, assuming the dc voltage resulting from the second-order transconductance of the square law-detector is 1, then the useful output dc voltage can be expressed [20,21] as…”

Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

“…assuming the dc voltage resulting from the second-order transconductance o law-detector is 1, then the useful output dc voltage can be expressed [20,21]…”

Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

“…The advantage is that the matching state of the detector in the broadband range is very good, and the sensitivity in the working frequency band is relatively flat. However, this matching method will cause most of the energy of the input signal to be consumed by the resistor, so the sensitivity of the detector will deteriorate sharply [20,21].…”

Section: Detection Circuitmentioning

confidence: 99%

“…As required by the amplifiers in the coupler and amplifier integrated chip, the DC voltage of the amplifiers is 3 V, and the total consumed current of the four amplifiers is 156 mA. Moreover, the size of the six-port circuit is 7.1 × 4 mm; compared to the previous work [19][20][21], the size of the six-port circuit has been significantly improved. The measurement result of the six-port circuit is represented in Figure 10.…”

Section: Measurement Of the Six-port Circuitmentioning

confidence: 99%

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A Compact Broadband Analog Complex Correlator with High Correlation Efficiency for Passive Millimeter-Wave Imaging System

Chen

et al. 2022

Electronics

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In this paper, the design, fabrication, and measurement of a compact broadband (4–8 GHz) analog complex correlator for a passive millimeter-wave imaging system are presented. To achieve high sensitivity and high integration of the imaging system, the wideband and miniaturization of the correlator are required. The correlator achieves wide bandwidth by using the add-and-square method, which is composed of a six-port circuit and a detection circuit. In order to realize the miniaturization of the correlator, the six-port circuit is realized on the chip base on the 0.15-μm gallium arsenide (GaAs) process. The influence of mismatch of the detection circuit that employs zero-bias Schottky diodes on the correlator is also analyzed to guide the design of the correlator. The measurement results of the designed chips and detector are consistent with the simulation result. Finally, a Sweep-frequency test is applied to the designed correlator, and the measurement results show that, within the frequency range of 4–8 GHz, the correlation amplitude fluctuation is less than 1.9 dB and the correlation efficiency is larger than 99%, which reveal that the correlator is suited for interferometric passive millimeter-wave imaging applications.

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Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

“…assuming the dc voltage resulting from the second-order transconductance o law-detector is 1, then the useful output dc voltage can be expressed [20,21]…”

Section: Principle Of the Proposed Analog Correlatormentioning

confidence: 99%

Section: Detection Circuitmentioning

confidence: 99%

Section: Measurement Of the Six-port Circuitmentioning

confidence: 99%

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A Compact Broadband Analog Complex Correlator with High Correlation Efficiency for Passive Millimeter-Wave Imaging System

Chen

et al. 2022

Electronics

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Application of the Schottky diode as a detector of continuous terahertz radiation

Badin

Moskalenko

Pidotova

2021

J. Phys.: Conf. Ser.

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The results of research of the electrophysical and frequency characteristics of the semiconductor structure of a Schottky diode based on gallium arsenide are presented. The diode structure was modelled in the Sentaurus TCAD software package. A comparison of the current-voltage characteristics obtained by mathematical modeling and by experiment are presented. The frequency response in the range of 115-257 GHz is shown. The use of a Schottky diode as a continuous terahertz radiation detector is shown.

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A Novel Near Field Image Reconstruction Method Based on Beamforming Technique for Real-Time Passive Millimeter Wave Imaging

Zhao

Han

et al. 2022

IEEE Access

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A Ka-band 1024-channel passive millimeter wave (PMMW) imager (BHU-1024) based on synthetic aperture interferometric radiometer (SAIR) technique has been developed by Beihang University for security screening. BHU-1024 uses linear phased array to obtain resolution in the horizontal direction and uses aperture synthesis to obtain resolution in the vertical direction. This imager is designed for detecting concealed weapons on the human body and operated under the near-field condition of the antenna array. Thus, the conventional direct Fourier imaging theory, which is based on the far-field approximation, can't be applied any longer. In this paper, a novel near-field image reconstruction method based on the beamforming technique is proposed. In this method, we derive the near-field imaging formula by beamforming theory and demonstrate the feasibility of obtaining spatial brightness temperature distribution by beam focusing. In the design of the beamformer, we further optimize the weight vector to suppress the sidelobe levels of the synthesized beam. The results of simulation and measurement demonstrate that the proposed method is an advantageous, effective imaging method for near-field passive millimeter wave imaging. At present, the proposed method has been applied to the actual passive millimeter wave imaging system BHU-1024.INDEX TERMS Near field imaging, beamforming technique, real-time passive millimeter wave imaging, security screening.

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A GaAs Power Detector Design for $C$ -Band Wideband Complex Cross Correlation Measurement

Cited by 14 publications

References 36 publications

A Compact Broadband Analog Complex Correlator with High Correlation Efficiency for Passive Millimeter-Wave Imaging System

A Compact Broadband Analog Complex Correlator with High Correlation Efficiency for Passive Millimeter-Wave Imaging System

Application of the Schottky diode as a detector of continuous terahertz radiation

A Novel Near Field Image Reconstruction Method Based on Beamforming Technique for Real-Time Passive Millimeter Wave Imaging

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