Results 171 to 180 of about 13,252 (205)
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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.
Jerome Ferretti +3 more
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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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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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Broad-band VSWR measurements of a Cassegrain antenna
IEEE Transactions on Antennas and Propagation, 1978Broadband VSWR measurements are reported on a small F -number Cassegrain antenna. Cyclical variations of VSWR between 1.00 and 1.25 with a 350-MHz frequency interval between unity VSWR values were observed over the 8.5-12.4 GHz frequency range. These variations correspond to a change in the power transmission ratio of 1.231 percent between the unity ...
W. Nunn, M. Figueroa
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Automatic site-VSWR measurement using mobile robot platform
2014 International Symposium on Electromagnetic Compatibility, 2014We have developed an automatic site-VSWR (SVSWR) measurement system using a mobile robot platform and an optical microwave transmitter. The proposed system can rapidly evaluate the performance of EMI anechoic chambers. In this paper, we explain the SVSWR measurement results obtained with the proposed system and the device configuration.
Michitaka Ameya, Satoru Kurokawa
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Transmitting Antenna VSWR Effects on FM Stereo
IEEE Transactions on Broadcasting, 1963The effects of antenna VSWR on stereo left-right channel separation of a FM broadcasting station were investigated. The results of these tests were significant and indicate that the transmitting antenna VSWR for ±200 KC must be low. They also indicate that if the rest of the system from studio to the output of the stereo receiver is fixed, a change in ...
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VSWR-protected 90 W L-band AlGaN/GaN power amplifier
2014 IEEE MTT-S International Microwave Symposium (IMS2014), 2014Solid-state power amplifiers need protection against reflected power at the output caused by load mismatch. The standard method for protection is to include a ferrite-based isolator at the output. The isolator will redirect all reflected power to a dissipating load resistor and will ensure that the output of the amplifier always sees a 50 Ω load ...
Heijningen, M. van de +4 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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Coaxial Swept-Frequency VSWR Measurements Using Slotted Lines
IEEE Transactions on Instrumentation and Measurement, 1968A system is described using a sweep generator, a slotted line with a broad-band probe, a sliding load which can be coupled mechanically to the probe carriage, a logarithmic amplifier, and a read-out device which can measure the VSWR of coaxial components continuously versus frequency.
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Influences of CUT on the VSWR of GTEM Cell
2009 20th International Zurich Symposium on Electromagnetic Compatibility, 2009The GTEM cell method to measuring shielding effectiveness is accepted by ANSI/SCTE48-3 2004, but there is no analysis of the influences of the introduction of cable under test(CUT) on the VSWR of GTEM cell, which will result in measure error. The influences of the size, position, shape and direction of CUT is analyzed by simulation, and the influences ...
Xiang Zhou +2 more
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