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>

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 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.

Predictive Control of AC/AC Matrix Converter

2017 ◽  
Vol 8 (4) ◽  
pp. 1932
Author(s):  
Siti Hajar Yusoff ◽  
Nur Shahida Midi ◽  
Sheroz Khan ◽  
Majdee Tohtayong
Keyword(s):  
Predictive Control ◽  
Output Voltage ◽  
Experimental Studies ◽  
Matrix Converter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Current Controller ◽  
Voltage Controller ◽  
Low Pass ◽  
Switching State

<span>This work investigates the usage of Model Predictive Control (MPC) for a three phase conventional matrix converter with low pass filter at the input and output side. The conventional matrix converter has 3 input and 3 output which gives 27 switching state. From this design, a MPC is incorporate to control the output voltage and the input currents for all the phases. The design of the proposed controller is based on the input current controller and output voltage controller with load observer.  The proposed MPC using cost function will select the minimized switching state to be applied to next switching. This gives a sinusoidal output voltages and input currents. A simulation and experimental studies are presented to validate the proposed control scheme.</span>

scholarly journals Harmonic Suppression Strategy in Single-phase SPWM Based on Mixed Integer Nonlinear Programming

2019 ◽  
Vol 13 (5) ◽  
pp. 22
Author(s):  
Lubin Wu ◽  
Ziquan Liang ◽  
Weihua Li ◽  
Xiaoteng Wang
Keyword(s):  
Output Voltage ◽  
Single Phase ◽  
Mixed Integer ◽  
Harmonic Suppression ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Integer Nonlinear Programming ◽  
Low Pass ◽  
Harmonic Components ◽  
Suppression Strategy

In single-phase bipolar SPWM inverter circuit, the output voltage contains high content of harmonic components. To solve this problem, we build a model of output voltage in single-phase SPWM bipolar inverter based on SPWM theory and Fourier series theory. Through theoretical analysis, calculation and plotting, we work out the distribution of harmonic in output voltage, investigate the relationship between amplitude modulation (AM) depth and harmonic components and finally determine a proper amplitude modulation depth to efficiently reduce harmonic components. To further reduce harmonic components of output voltage, we use LC low-pass filter. Then, based on the mathematical model of the filter and the distribution law of harmonics, we establish a mixed integer nonlinear programming to fully suppress harmonics and reduce switching losses. After searching for two times based on genetic algorithm, we work out the best frequency-modulation ratio and LC low-pass filter parameter. Finally in simulation, total harmonic distortion is reduced from 213.47 percent to 0.16 percent after harmonic suppression strategy implemented. The result has proved the effectiveness of the harmonic suppression strategy we applied, which can be used as a reference for output voltage harmonic elimination in single-phase SPWM inverter.

A 2.45-GHz dual-diode rectenna and rectenna arrays for wireless remote supply applications

2011 ◽  
Vol 3 (3) ◽  
pp. 251-258 ◽  
Author(s):  
Hakim Takhedmit ◽  
Laurent Cirio ◽  
Boubekeur Merabet ◽  
Bruno Allard ◽  
François Costa ◽  
...  
Keyword(s):  
Global Analysis ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Dc Voltage ◽  
Optimal Output ◽  
Dc Power ◽  
Optimal Load ◽  
Analysis Technique ◽  
Low Pass ◽  
In Series

This paper describes a compact and efficient rectenna based on a dual-diode microstrip rectifier at 2.45 GHz. This circuit has been designed and optimized using a global analysis technique which associates electromagnetic and circuit approaches. Due to the differential topology of the rectifier, neither input low-pass filter nor via-hole connections are needed. This makes the structure more compact reducing losses. Measurements of a single rectenna element show 83% efficiency over an optimal load of 1050 Ω at a power density of 0.31 mW/cm2. To increase the received RF power and then increase dc power over the load, identical rectennas have been interconnected to form arrays. Two and four elements rectenna arrays, connected either in parallel or in series, have been developed. It was shown that by properly choosing the interconnection topology and the optimal output load, higher dc voltage or dc power have been obtained. The four-element series-connected array can provide experimentally up to 3.85 times output dc voltage compared to the single rectenna. The parallel-connected rectenna arrays generate approximately 2.15 and 3.75 times output dc power for two and four elements, respectively.

scholarly journals Tunable Lowpass Filter with RF MEMS Capacitance and Transmission Line

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Shimul C. Saha ◽  
Ulrik Hanke ◽  
Håkon Sagberg ◽  
Tor A. Fjeldly ◽  
Trond Sæther
Keyword(s):  
Transmission Lines ◽  
Parallel Plate ◽  
Rf Mems ◽  
Cutoff Frequency ◽  
Lowpass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Measurement Results ◽  
Low Pass ◽  
Lumped Elements

We have presented an RF MEMS tuneable lowpass filter. Both distributed transmission lines and RF MEMS capacitances were used to replace the lumped elements. The use of RF MEMS capacitances gives the flexibility of tuning the cutoff frequency of the lowpass filter. We have designed a low-pass filter at 9–12 GHz cutoff frequency using the theory of stepped impedance transmission lines. A prototype of the filter has been fabricated using parallel plate capacitances. The variable shunt capacitances are formed by a combination of a number of parallel plate RF MEMS capacitances. The cutoff frequency is tuned from C to X band by actuating different combinations of parallel capacitive bridges. The measurement results agree well with the simulation result.

scholarly journals Cascade-Type Pole-Zero Cancellation Output Voltage Regulator for DC/DC Boost Converters

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3824
Author(s):  
Sung Hyun You ◽  
Koo Bonn ◽  
Dong Soo Kim ◽  
Seok-Kyoon Kim
Keyword(s):  
Output Voltage ◽  
Closed Loop ◽  
Active Damping ◽  
Voltage Regulator ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Boost Converters ◽  
System A ◽  
Low Pass ◽  
Cascade Structure

This paper presents a novel output voltage regulator in the cascade structure under the consideration of both the parameter and load uncertainties. It leads to the first-order closed-loop inner and outer loop dynamics in the low-pass filter form by the pole-zero cancellation through the active damping injection, which is the main contribution of this study. Moreover, it is proved that the active damping injection level determines the disturbance rejection capability of the closed-loop system. A 3-kW DC/DC boost converter confirms the actual advantages from these two contributions.

Sign in / Sign up

Export Citation Format

Share Document