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A Low VSWR Matching Technique (Correspondence)
IEEE Transactions on Microwave Theory and Techniques, 1956A variation on the method described by Feller and Weidner for abtaining low standing wave ratios over a frequency band has proven to be very useful in the design of low vswr microwave components. If curve A in Fig. 1 represents the input admittance of the device to be matched, the method described by Feller proceeds as follows: 1) Insert a value of ...
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VSWR protection of power amplifiers using BST components
2016 German Microwave Conference (GeMiC), 2016A VSWR-protected ISM-band PA was realized using a BST based varactor for detuning of the input matching. Output VSWR levels of 30:1 can be tolerated by applying a varactor bias voltage of up to 20 V. The PA delivers 47.4 dBm output power at a maximum PAE of 49.5%. In case of high VSWR conditions the output power can be limited by detuning the varactor.
Sebastian Preis +2 more
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VSWR reduction for large millimeter-wave cassegrain radiotelescopes
International Journal of Infrared and Millimeter Waves, 1991Multiple reflections in large radiotelescopes used for astronomical spectroscopy cause characteristic modulations of the observed spectrum (“baseline ripple”). For a given mechanism, the magnitude of the effect depends primarily on the reflection coefficient, which for the most important paths is proportional to λ.
Rachael Padman, Richard E. Hills
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A Six-port Coupler with High Directivity for VSWR Measurement
2005 Asia-Pacific Microwave Conference Proceedings, 2006This paper presents a six-port coupler with high directivity for VSWR measurement. By using capacitive compensation, dramatic achievement of over 35dB directivity with microstrip configuration at the central frequency is achieved. The design procedure of the coupler is provided. All analytical results are categorically verified by experiment.
null Jingjing Huang +3 more
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A VSWR-rugged silicon bipolar RF power amplifier
Proceedings of the Bipolar/BiCMOS Circuits and Technology Meeting, 2005., 2005In this paper, the effect of emitter ballast on the ruggedness of RF power amplifiers is investigated. Silicon bipolar 1.8-GHz power amplifiers based on different ballasted transistors have been integrated and tested under load mismatch conditions. A ballasted device with 25-mV emitter voltage drop achieves the optimum trade-off between ruggedness and ...
A. SCUDERI +3 more
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Traceable Site-VSWR Measurements for Validating Anechoic Chamber
2018 Conference on Precision Electromagnetic Measurements (CPEM 2018), 2018This paper presents recent works on traceable site-VSWR (Voltage Standing Wave Ratio) measurements for validating RF semi-anechoic chamber in 1 GHz – 18 GHz, in accordance with CISPR (International Special Committee on Radio Interference) 16-1-4 technical standard.
Yu Song Meng, Junhong Deng, Yueyan Shan
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A Low VSWR Matching Technique (Correspondence and Authors' Reply)
IRE Transactions on Microwave Theory and Techniques, 1957I would like to call your attention to a certain error in the above correspondence. The admittance function plotted by the author on the Smith chart winds counter-clockwise. This is contrary to the laws of nature for passive linear networks. These laws prescribed that the plot of the admittance function wind clockwise from the low to the high frequency.
P.A. Rizzi, L. Goldstone
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Use of a VSWR meter in problems of propagation constants measurement
2000 10th International Crimean Microwave Conference. "Microwave and Telecommunication Technology". Conference Proceedings (IEEE Cat. No.00EX415), 2000The possibility of measurement of wave propagation constant of completely and partly filled waveguides is shown by means of complex dielectric permeability. Corresponding measurement methods are considered.
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Improving VSWR and Bandwidth by Eliminating Steps in Coaxial Connectors
2009 International Conference on Computing, Engineering and Information, 2009Coaxial connectors are used extensively in cables and microwave components. Any losses or reflections are detrimental to a microwave or RF system as they reduce the power transmitted and they become a source of noise thus reducing the overall system Signal to Noise ratio.
John Howard +2 more
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Study of Active VSWR in a Reduced BFN Antenna Array
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019in this work, we explore the potentiality of a reconfigurable antenna with a particular excitation scheme to reduce the complexity of its Beam forming Networks (BFN). An example based on a 7×7 stacked microstrip patches with 15% of the elements excited has been investigated, to optimize the overall performances, and especially the active reflection ...
Hala Alzein +5 more
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