Amplifiers – With distributed parameter-type coupling means – Waveguide – cavity – or concentric line resonator
Patent
1992-08-21
1994-08-16
Mullins, James B.
Amplifiers
With distributed parameter-type coupling means
Waveguide, cavity, or concentric line resonator
330 55, 330286, H03F 360
Patent
active
053390431
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to wave propagation signal transmission devices of a novel type, usable in particular for the construction of wide band H.F power amplifiers.
The H.F. amplifier with wide passband (from LF to VHF) is customarily obtained with the aid of power tubes functioning with localised constants. These tubes possess dimensions and physical and electrical characteristics which are defined pointwise (current, input and output capacitances/inductances, amplifying ability between an input level and an output level, etc).
It has been proposed to increase the dimensions of vacuum tubes and the surface area of electrodes with the aim of enhancing the power amplification. The corresponding increase in input and output capacitances has the unfavourable effect of substantially reducing the passband of the amplifier tube (generally defined with respect to a power attenuation of -3db). In practice, the product "power gain.times.passband" is substantially constant for a given tube used alone or in an assembly of several tubes mounted in parallel.
It has also been proposed to construct an amplifier in part with distributed constants by constituting a distribution line in which the localised constants which the tubes represent are associated with complementary localised inductive elements to create a propagation line at input (the input capacitances associated with these inductances thereby producing a low-pass filter). Similarly, the output capacitances of the tubes are associated with localised inductive elements to create a propagation line at output connected to the unit's useful load. The U.S. Pat. No. 3,808,546 describes a configuration of this type in which a complete unit of several tubes is placed in a vacuum inside a common enclosure.
This solution, although representing an improvement, also has its limits in the field of HF amplification owing to the high values of the input and output capacitances of the tubes.
SUMMARY OF THE INVENTION
The invention aims in particular to produce improved performance wide band HF power amplifiers.
To this effect the invention proposes a wave propagation signal transmission device comprising, apart from means of propagating waves between an input point E and an output point S, active means of amplifying the signals in transit possessing two means each forming an electrode, a possibly controlled electrode emitting charge carriers on the one hand and an electrode collecting charge carriers on the other hand, said means each forming an electrode being integrated with the said wave propagation means and respectively associated the one with the signal input point E, the other with the signal output point S, the device being characterised in that the said wave propagation means comprise two coupled wave propagation structures with distributed constants, the one of the said structures integrating the said means forming an emitting electrode (cathode) and means forming a control grid, in the form of linear and continuous components inside the input propagation structure, the other of the said structures integrating the said means forming a collecting electrode (anode) and, optionally, means forming an acceleration, control or output/input decoupling screen, in the form of linear and continuous components inside the output propagation structure.
Thus integration in the form of linear and continuous components of the amplification means with the wave propagation means permits the distributing of the input and output capacitances along the wave propagation signal transmission means and the attenuating of their undesirable effects regarding reduction in the passband, whilst yet profiting from the increase in the amplified power resulting from the enhancement in the available active surface area of the electrodes in respect of the amplification functions; these surface areas depend directly on the dimensions of these same wave propagation means. For the remainder of the exposition, the device according to the invention will be referred to i
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patent: 2785338 (1957-03-01), Goddard
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patent: 3247420 (1966-04-01), Mayer
patent: 3750043 (1973-07-01), Epsztein
patent: 3808546 (1974-04-01), Nakazato et al.
patent: 4091332 (1978-05-01), Crandall
patent: 4967162 (1990-10-01), Barnett et al.
Mullins James B.
Prana Recherche et Development
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