Results 181 to 190 of about 13,252 (205)

Aircraft ATC Antenna VSWR On-wing Tester

2014
The reason of the ATC antenna failure is mostly the mismatch of the ATC transponder output impedance with the ATC Antenna impedance. The mismatch causes the increasement of the Voltage Standing Wave Ratio (VSWR) and the severe low efficiency of the emission (receive), then the ATC/TCAS system cannot working normally.
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Precision Coaxial VSWR Measurements by Coupled Sliding-Load Technique

IEEE Transactions on Instrumentation and Measurement, 1964
The method described employs a slotted line for VSWR measurement and a precision coaxial line as an impedance standard. A sliding load terminates the standard line during the process of transforming the impedance of the slotted line to that of the standard line.
B. O. Weinschel, G. U. Sorger, S. J. Raff, J. E. Ebert   +3 more
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GaN-HEMT VSWR Ruggedness and Amplifier Protection

2010
This paper presents the initial results in a study aimed at exploring the use of GaN-devices in applications where they are at risk of being exposed to high output voltage-standing-wave-ratio (VSWR) conditions. A measurement method developed to identify the limits of such stress is described together with the first results from measurements of novel ...
Bengtsson, O., Bent, G. van der, Rudolph, M., Würfl, J., Heijningen, M. van, Vliet, F.E. van   +5 more
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Decoupling probe method of measuring very high VSWR

Proceedings of the IEEE, 1967
By using a conventional slotted-line technique, a high value of VSWR can be measured by initially obtaining a reading at the V min , and then, without changing the meter scale, decoupling the probe in successive increments until the V max is reached.
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Planar low VSWR monopole antenna for UWB and LTE communication

2016 16th Mediterranean Microwave Symposium (MMS), 2016
In this article, a printed planar low VSWR monopole antenna with a new modified ground plane for ultra-wideband (UWB) and 2.6 GHz LTE-band applications is presented. The dimensions of proposed antenna structure are optimized to achieve low VSWR performance. The antenna is fabricated on a low cost FR4 epoxy substrate and tested.
L. Ghanbari, A. Keshtkar, S. Ghanbari, S. Jarchi   +3 more
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A Low VSWR Matching Technique (Correspondence and Authors' Reply)

IRE Transactions on Microwave Theory and Techniques, 1957
I 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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Study of Active VSWR in a Reduced BFN Antenna Array

2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019
in 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, Jorick Milbrandt, Abdul-Sattar Kaddour, Cyrille Menudier, Marc Thevenot, Thierry Monediere   +5 more
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Limitations of the Free Space VSWR Measurements for chamber validations

AMTA 2016 Proceedings, 2016
Free Space VSWR measurement has been the de facto standard method for anechoic chamber performance evaluation for more than 50 years. In this method, a probe antenna is first kept parallel with the boresight angle while traveling along a linear path to record the receive pattern.
Zhong Chen, Zubiao Xiong, Amin Enayati
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Electrical properties of an un-cooled microwave waveguide applicator—VSWR

Journal of Physics D: Applied Physics, 2003
Work in microwave plasma generation at the University of Wollongong has resulted in a succession of plasma applicators that utilize rectangular waveguides to generate a collimated microwave plasma beam suitable for applications as diverse as spectroscopic light sources or as fusion welding tools. This paper examines in detail the electrical properties,
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Improving TV Transmitter System VSWR and Related Frequency Response

IEEE Transactions on Broadcasting, 1975
This paper establishes the quantitative relation between a TV transmitter load VSWR and the system frequency response. The need for a low value of VSWR is stressed, particularly for multimode transmitting systems.
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