scholarly journals The Design of Terahertz Frequency Quadruplers Based on Discrete Schottky Diodes

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 69
Author(s):  
Yuhang Li ◽  
Dehai Zhang ◽  
Jin Meng ◽  
Haotian Zhu ◽  
Siyu Liu
Keyword(s):  
Output Power ◽  
Schottky Diodes ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Peak Output Power ◽  
W Band ◽  
Low Pass ◽  
Matching Structure ◽  
Better Than ◽  
Gradient Line

On the basis of the W-band power source, a single-stage frequency quadrupler method was used to implement two 335 GHz frequency quadruplers. The two frequency quadruplers adopted a traditional binomial matching structure and an improved gradient line matching structure, respectively. An idle loop was added to the overall circuit in the design of the DC filter and low-pass filter. The improved gradient line matching structure reduced the circuit length while increasing the bandwidth, effectively reducing the power loss on the transmission line. A micro-strip circuit was fabricated with a 50 μm thick quartz circuit and was mounted onto a split waveguide block. The results showed that the output power of the quadrupler with the improved matching structure was better than that of the quadrupler with the conventional matching structure. The peak output power of the improved frequency quadrupler was 4.75 mW at 333 GHz when driven with 200 mW. In contrast, this improved structure broadened the bandwidth by 8 GHz and reduced the length of the substrate by 0.607 mm, effectively reducing the length of the traditionally designed circuit by 11.5%.

scholarly journals Design of broadband Class EF power amplifier based on low-pass filter matching structure

2019 ◽  
Vol 16 (12) ◽  
pp. 20190264-20190264 ◽  
Author(s):  
Zhiwei Zhang ◽  
Zhiqun Cheng ◽  
Guohua Liu
Keyword(s):  
Power Amplifier ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Matching Structure

scholarly journals From irradiance to output power fluctuations: the PV plant as a low pass filter

2011 ◽  
Vol 19 (5) ◽  
pp. 505-510 ◽  
Author(s):  
Javier Marcos ◽  
Luis Marroyo ◽  
Eduardo Lorenzo ◽  
David Alvira ◽  
Eloisa Izco
Keyword(s):  
Output Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Power Fluctuations ◽  
Low Pass

scholarly journals High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 102
Author(s):  
Noy Citron ◽  
Eldad Holdengreber ◽  
Oz Sorkin ◽  
Shmuel E. Schacham ◽  
Eliyahu Farber
Keyword(s):  
High Performance ◽  
Schottky Diodes ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Noise Rejection ◽  
Low Pass ◽  
Hybrid Coupler ◽  
Band Pass ◽  
Simulation Results

A high-performance S-band down-conversion microstrip mixer, for operation from 77 K to 300 K, is described. The balanced mixer combines a 90 degree hybrid coupler, two Schottky diodes, a band pass filter, and a low pass filter. The coupler phase shift drastically improves noise rejection. The circuit was implemented according to the configuration obtained from extensive simulation results based on electromagnetic analysis. The experimental results agreed well with the simulation results, showing a maximum measured insertion loss of 0.4 dB at 2 GHz. The microstrip mixer can be easily adjusted to different frequency ranges, up to about 50 GHz, through the proper choice of microstrip configuration. This novel S-band cryogenic mixer, implemented without resorting to special components, shows a very high performance at liquid nitrogen temperatures, making this mixer very suitable for high-temperature superconductive applications, such as front-ends.

scholarly journals Removing mains power artefacts from EEG – a novel template-based method

2020 ◽  
Author(s):  
Shenghuan Zhang ◽  
Brendan McCane ◽  
Phoebe S-H Neo ◽  
Neil McNaughton
Keyword(s):  
Notch Filter ◽  
Electrical Equipment ◽  
Noise Removal ◽  
Sine Wave ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Adaptive Notch Filter ◽  
Low Pass ◽  
Power Noise ◽  
Better Than

ABSTRACTEEG signals are often contaminated with artefacts, particularly with mains power from electrical equipment. Low-pass filtering and notch filtering can lose valuable data. Here we describe a novel mains power noise removal method based on the fact that mains power noise is a sine wave component with an essentially fixed frequency and the same phase across all channels. This removes the blink component, leaving uncontaminated EEG largely unchanged. Blink removal had a success rate of >99.9% recovered variance of the original EEG when removing synthesised mains power components. We compared this method with two other popular mains power noise removal methods. Our method was better than Cleanline which is an ICA based method and multiple PLI which is an adaptive notch filter based method. With the higher recovery, our method shows clear advantages over Cleanline and multiple PLI for removing mains power noise. From the aspect of data loss, it is obviously better than low-pass filter and normal notch filter.

MTF Compensation Combining Reciprocal Cell with Shift Invariance Wavelet

2011 ◽  
Vol 48-49 ◽  
pp. 719-723
Author(s):  
Zhao Jun Liu ◽  
Zhi Zhang ◽  
De Shen Xia
Keyword(s):  
Cutoff Frequency ◽  
Band Pass Filter ◽  
Test Results ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Shift Invariance ◽  
Band Pass ◽  
Better Than

On remote sensing imaging platform, quality of image is normally degraded by aliasing. The low-pass filter is commonly used to dealiasing. However low-pass filter introduces error for frequencies above its cutoff frequency. And the removed aliasing is also valuable information. To retain the valuable information, we propose a restoration based on band-pass filter. Firstly, the image is transformed into frequency domain. A restoration of reciprocal cell is adopted. It is based on geometrical characteristics of sensors. As a result, the superposition parts are separated from spectrum inside the bandwidth. Then aliasing spectrum is put into right position. Inverse filter is used to deblurring and remove the color noise. Finally, the shift invariance wavelet is combined to reduce the white noise. The test results indicate that the proposed restoration is better than conventional restorations. Valuable information of the restored spectrum is more than degraded spectrum. So this proposed method will be beneficial in the field of practical projects.

scholarly journals A new design of high output voltage rectifier for rectenna system at 2.45 GHz

2019 ◽  
Vol 13 (1) ◽  
pp. 226 ◽  
Author(s):  
Abdellah Taybi ◽  
A. Tajmouati ◽  
J. Zbitou ◽  
A. Errkik ◽  
M. Latrach ◽  
...  
Keyword(s):  
Output Voltage ◽  
Schottky Diodes ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Conversion Efficiency ◽  
Dc Power ◽  
Measurement Results ◽  
Low Pass ◽  
High Output Voltage ◽  
High Output

<p>This paper deals with the design and achievement of a novel microstrip rectifier with high conversion efficiency and output voltage. Firstly, we have designed a rectifier based on HSMS2820 Schottky diodes by using a series topology to convert the electromagnetic energy into DC power. Then, a stepped-impedance low pass filter was implemented to filter the unwanted harmonics generated by the non-linear Schottky diode. Both of the structures have been simulated and fabricated on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6 mm and loss tangent of 0.025. Good performances were confirmed throughout the measurement results and an interesting output voltage was observed.</p>

Design of Programmable Wideband Low Pass Filter with Continuous-Time/Discrete-Time Hybrid Architecture

2017 ◽  
Vol E100.C (10) ◽  
pp. 858-865 ◽  
Author(s):  
Yohei MORISHITA ◽  
Koichi MIZUNO ◽  
Junji SATO ◽  
Koji TAKINAMI ◽  
Kazuaki TAKAHASHI
Keyword(s):  
Discrete Time ◽  
Continuous Time ◽  
Hybrid Architecture ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

ANALYSIS AND IMPROVEMENT TECHNIQUES FOR THE TRANSFER FUNCTION OF A PLANAR LOW - PASS FILTER

2016 ◽  
Vol 15 (12) ◽  
pp. 2579-2586
Author(s):  
Adina Racasan ◽  
Calin Munteanu ◽  
Vasile Topa ◽  
Claudia Pacurar ◽  
Claudia Hebedean
Keyword(s):  
Transfer Function ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass
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