A Frequency Tunable Circulator With 70-dB Isolation Using Reflection Coefficient Controller for Arbitrary Load Impedance

2021 ◽  
pp. 1-1
Author(s):  
Donghyun Lee ◽  
Gisung Yang ◽  
Jong-Hyuk Park ◽  
Byung-Wook Min
Keyword(s):  
Reflection Coefficient ◽  
Load Impedance ◽  
Arbitrary Load ◽  
Frequency Tunable

Variability Analysis of Pi Network Impedance Matching

2013 ◽  
Vol 291-294 ◽  
pp. 2527-2531
Author(s):  
Jian Wen Tan ◽  
Si Jian Deng ◽  
Fang Wei Ye ◽  
De Ping Zeng
Keyword(s):  
Reflection Coefficient ◽  
Quality Factor ◽  
Large Deviation ◽  
Design Method ◽  
Impedance Matching ◽  
Perfect Match ◽  
Small Variation ◽  
Load Impedance ◽  
Harmonic Rejection ◽  
Impedance Variation

Harmonic rejection ability and reflection coefficient are the most important factors in the design of impedance matching network. However, stability of impedance matching should be taken into account in applications existing load impedance variation and component deviation due to tolerance and process variation. This paper investigates variability of Pi network impedance matching analytically. The relationships between resulting reflection coefficient with component deviation and load impedance variation are theoretically derived on the basis of Q-based design method. The deviation from perfect match due to component deviation is proportional to quality factor. Higher quality factor probably means poorer quality in terms of variability. The resulting reflection coefficient caused by load impedance variation increases rapidly when the load reflection coefficient is larger than 0.66. A small variation in the load impedance will cause a large deviation from perfect match when the impedance difference between load and source is quite large.

Variability Analysis of T Network Impedance Matching

2013 ◽  
Vol 427-429 ◽  
pp. 620-623
Author(s):  
Jian Wen Tan ◽  
Si Jian Deng ◽  
Fang Wei Ye ◽  
De Ping Zeng
Keyword(s):  
Reflection Coefficient ◽  
Design Process ◽  
Design Method ◽  
Impedance Matching ◽  
Load Impedance ◽  
Variability Analysis ◽  
Matching Networks ◽  
Harmonic Rejection ◽  
Impedance Variation ◽  
Parameter Variations

Harmonic rejection ability and reflection coefficient are the most important factors in the design of impedance matching network. However, stability of impedance matching should be taken into account in applications existing load impedance variation and component deviation due to tolerance and process variation. This paper investigates variability of T network impedance matching analytically. The formulas for calculating the resulting reflection coefficient caused by parameter variations are derived from quality factor-based design method. The analysis results can provide reference for design process and an opportunity for a better understanding of the dynamic behavior of the narrowband impedance-matching networks.

scholarly journals Behavioral modeling of nonlinear transfer systems with load-dependent <i>X</i>-parameters

2017 ◽  
Vol 15 ◽  
pp. 37-41
Author(s):  
Seyed Mohammadamin Moosavi ◽  
Christian Widemann ◽  
Wolfgang Mathis
Keyword(s):  
Reflection Coefficient ◽  
Measurement Techniques ◽  
Large Error ◽  
Behavioral Modeling ◽  
Large Signal ◽  
Arbitrary Load ◽  
Nonlinear Transfer ◽  
S Parameters ◽  
Load Pull ◽  
Smith Chart

Abstract. In this contribution, different approaches based on the X-parametersTM to model the behavior of mismatched nonlinear transfer systems are examined. The X-parameters based on the PHD1-principle introduced by Verspecht and Root (2006) as an extension of the well-known S-parameters describe nonlinear microwave 2-port-networks under large signal conditions. Using load-pull measurement techniques they can be used for arbitrary load situations. Beside this load-pull approach, in the work of Cai et al. (2015), it is stated that it is sufficient to use one optimized X-parameter set for each value of the load reflection coefficient without introducing a large error. In another contribution of Cai and Yu (2015), this approach is extended to cover the whole smith chart with one optimized X-parameter set instead. In this work, these different approaches are compared and brought into question. 1 polyharmonic distortion; Verspecht and Root (2006).

Designing 6–18 GHz Microstrip Filters with Removing Unwanted Upper and Lower Band Frequency Responses and with Arbitrary Load Impedance Matching

2020 ◽  
pp. 2150131
Author(s):  
Alireza Sharifi
Keyword(s):  
Impedance Matching ◽  
Computer Code ◽  
Optimization Method ◽  
Ultra Wideband ◽  
Load Impedance ◽  
Band Frequency ◽  
Arbitrary Load ◽  
Frequency Responses ◽  
Full Wave ◽  
Wave Methods

In this paper, Ultra-Wideband (UWB) filters at 6–18[Formula: see text]GHz are designed that can reduce undesired frequency responses at lower and upper frequency bands to less than [Formula: see text]20[Formula: see text]dB. Arbitrary load impedances are considered in the design of these filters. The structure of these filters is the combination of microstrip band-pass filters and Defected Ground Structures (DGSs) with multiple sections. The optimum circuit dimensions are calculated using a computer code which implements the Least Mean Squares (LMS) optimization method. Two design examples are included to illustrate this method. In these examples, eight-section DGS structures are employed to eliminate the unwanted upper frequency band responses. To ensure the correct performance of the designed filters, they are analyzed using full-wave methods and fabrication and the results of the measurement or full-wave analysis shows good agreement with the results of the computer code and the circuit model simulations.

The method of determining the metrological performance of unit reference standards of reflection coefficient in waveguides at millimeter waves

2020 ◽  
pp. 59-63
Author(s):  
A.S. Bondarenko ◽  
A.S. Borovkov ◽  
I.M. Malay ◽  
V.A. Semyonov
Keyword(s):  
Reflection Coefficient ◽  
Millimeter Waves ◽  
Primary Standard ◽  
Reference Standards ◽  
Measurement Scale ◽  
Current State ◽  
Coefficient Measurement ◽  
Mathematical Equations ◽  
Electrodynamic Modeling ◽  
Metrological Performance

The analysis of the current state of the reflection coefficient measurements in waveguides at millimeter waves is carried out. An approach for solving the problem of reproducing the reflection coefficient measurement scale is proposed. Mathematical equations, which are the basis of the reflection coefficient measurement equation are obtained. The method of determining the metrological performance of reflection coefficient unit’s reference standards is developed. The results of electrodynamic modeling and analytical calculations by the developed method are compared. It is shown that this method can be used for reproducing the reflection coefficient unit in the development of the State primary standard.

REFLECTION COEFFICIENT OF AN ELECTROMAGNETIC WAVE IN CONDUCTIVE MEDIA

2018 ◽  
pp. 100-106
Author(s):  
M. S. Sudakova ◽  
M. L. Vladov ◽  
M. R. Sadurtdinov
Keyword(s):  
Reflection Coefficient ◽  
Ground Penetrating Radar ◽  
Electromagnetic Waves ◽  
Water Contamination ◽  
Survey Design ◽  
Direct And Inverse Problems ◽  
The Difference ◽  
Ground Penetrating ◽  
Ideal Dielectric

Within the ground penetrating radar bandwidth the medium is considered to be an ideal dielectric, which is not always true. Electromagnetic waves reflection coefficient conductivity dependence showed a significant role of the difference in conductivity in reflection strength. It was confirmed by physical modeling. Conductivity of geological media should be taken into account when solving direct and inverse problems, survey design planning, etc. Ground penetrating radar can be used to solve the problem of mapping of halocline or determine water contamination.

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