Results 111 to 120 of about 142,661 (163)

Application of varactor diodes for reflectarray phase control

IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313), 2005
A new approach for beam steering in reflectarray applications is introduced in this paper. The progressive phase distribution is achieved by loading each microstrip patch element with a varactor diode on the radiating edge. In the following, the scattering characteristics of a single varactor loaded patch antenna will be presented.
BOCCIA, LUIGI, Venneri F, AMENDOLA, Gian Domenico, DI MASSA, Giuseppe   +3 more
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Development and characterization of varactor diodes for millimeter wavelenghts

1967 International Electron Devices Meeting, 1967
The GaAs varactors described here are P+NN+ mesa devices with base widths (distance between P-+ and N+regions) made as narrow as possible to achieve high cutoff frequency. Routine dimensions are now 1 to 2 microns using as thin a P+ diffusion as the epitaxial layer thickness permits. Diffusion depth is typically 1.5 to 2.0 microns.
C. Orman, M. Goff
openaire   +1 more source

GALLIUM ARSENIDE VARACTOR DIODES

1963
Abstract : Emphasis was placed on fabricating very high cutoff frequency diodes having breakdown voltages in excess of 6 v. Devices were fabricated using both melt-grown GaAs and epitaxial material. The results indicate that the highest cutoff frequencies were achieved using melt grown GaAs and that the best devices fabricated have cutoff frequencies ...
G. A. Kupsky, H. Kressel
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Microwave Applications of Diodes, Varactors and Tunnel Diodes

1980
Diodes provide many circuit functions (e. g., detection of signals, modulation of carrier frequencies with signal frequencies and subsequent demodulation) at high frequencies. Diodes are also used as RF switches and as harmonic generators for efficient frequency multiplication.
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Elastance coefficients for varactor diodes

International Journal of Electronics, 1974
This paper deals with the analysis and computations of the elastance Fourier coefficients of a pumped varactor diode, under different pump-level conditions. Consistent results are obtained from the two different methods employed to evaluate these coefficients.
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High-Q GaAs varactor diodes

IEEE Transactions on Electron Devices, 1978
A double epitaxial gallium arsenide tuning diode has been developed for TV varactor tuners. The capacitance variation ratio is 6.0 and is large enough to cover the UHF TV broadcasting band. Diode series resistance is 0.18 Ω ( Q = 200 ) at 470 MHz, and at a capacitance of 9 pF.
T. Hara, I. Niikura, N. Toyoda, M. Mihara   +3 more
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Varactor Diode Impedance Measurements†

Journal of Electronics and Control, 1964
ABSTRACT A comparison is made between impedance data obtained by two different methods for a coaxially encapsulated varactor diode. In one of these the impedances are normalized to the series resistance of the diode and in the other to the characteristic impedance of the measuring line. The agreement between the two sets of data is good.
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Characteristics of varactor diodes biased into avalanche

1965 International Electron Devices Meeting, 1965
Johnston, DeLoach, and Cohen have recently reported on the generation of microwave energy from reverse biased p-n junctions which were driven into the avalanche region. The present paper describes the performance obtained from diffused and epitaxial diffused silicon and epitaxial diffused gallium arsenide diodes designed primarily for parametric ...
V.J. Higgins, F.A. Br, J.J. Baranowski
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A varactor diode based predistortion circuit

2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535), 2004
Operation and performance of a varactor diode based linearizer is investigated. This novel predistortion topology employs a series resonant circuit with a reverse biased varactor diode acting as a power dependant capacitor. The linearizer itself is both simulated and tested to display its nonlinear properties.
N. Gupta, A. Tombak, A. Mortazawi
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Evaluation of high quality varactor diodes

Radio and Electronic Engineer, 1966
Recent measurement procedures used between 1 Mc/s and 40 Gc/s in evaluating very high cut-off frequency varactor diodes are discussed. The types of measurement are: bridge measurements at low frequencies, microwave coaxial line measurements, a transmission method near the diode series-resonant frequency, and a transmission method at diode parallel ...
D.A.E. Roberts, K. Wilson
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