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7023292 Polar modulation using amplitude modulated quadrature signals  
Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component...
6163231 Millimeter wave modulator and transmitter  
In a millimeter wave modulation of the direct modulation technology, the switching speed is increased and the modulation bandwidth is broadened. A millimeter wave modulator includes a millimeter...
6034574 Modulation apparatus  
A modulation apparatus connected to a termination edge of a waveguide path has a matching circuit, a detection diode for detecting a high-frequency signal inputted from the waveguide path, a...
5949297 Balanced modulator  
A balanced modulator has a pair of diodes, a plurality of line patterns including a balance-to-unbalance converter, the line patterns including lines extending toward and connected to the diodes,...
5561403 Oscillator and modulator arrangements on a circuit board  
A printed circuit board includes an oscillator and a modulator. The oscillator includes a first printed inductor and a capacitive diode which are printed on one side of the printed circuit board....
5416449 Modulator with harmonic mixers  
An improved modulator circuit for mixing a modulation signal with a carrier signal includes first and second harmonic mixers which are operative to produce modulated output signals at an output...
5214397 Modulator using low-pass filter as delay element  
A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately...
5159295 Microwave vector modulator and device for matching a microwave load  
A microwave vector modulator (4) of the reflective type is used to match a microwave load. The adjustable reflection of the vector modulator is obtained by semiconducting surfaces (18, 19, 20,...
5153536 Suppressed carrier modulator formed from two partial modulators each including a phase delay path  
A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator...
5006811 Dual quadrature frequency converter  
A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal...
4954790 Enhanced coupled, even mode terminated baluns, and mixers and modulators constructed therefrom  
A balun section formed of a pair of transmission lines connected between separate pairs of corresponding input and output terminals with a pair of capacitors connected in series between the output...
4954791 Non-commensurate line length rf modulator  
In a reflective shunt-diode radio-frequency modulator the shunting diodes are spaces so that the transmission line sections between diode pairs have non-commensurate lengths. The transmission line...
4894624 Combined amplitude modulator and frequency converter  
An amplitude modulator for mixing multifrequency signals characterized in that there are combined a mixer for producing a mixed signal by mixing not less than two alternating current signals with...
4755772 Switchable microwave oscillator  
A switchable microwave oscillator is disclosed that includes a quenching circuit for switching, attenuating, modulating, or otherwise controlling the output amplitude of frequency-stabilized,...
4727596 High dynamic range mixer  
A high performance, double-balanced mixer comprising a novel transformer and a pair of variable conductance semiconductor devices connected thereto which provides an output signal being the...
4725788 Switching amplifier  
A switching amplifier, in particular for generating a modulated anode voltage for a high-frequency, high-power AM transmitter, includes a number of switchable voltage sources. The switchable...
4675911 Monolithic microwave integrated circuit broadband mixer  
A monolithic microwave integrated circuit broadband mixer in which the distributed amplifier concept is used to develop a broadband mixer circuit.
4538122 Diode oscillator with independently variable frequency and power  
The oscillator includes a two-terminal device (1) as an active element and an impedance-matching network (4) for matching the two-terminal device to a load (A). The impedance-matching network is...
4160960 Power-dividing and modulating arrangement  
A power divider and modulator is disclosed comprising a HF signal source which supplies a carrier signal to a pair of 1/4λ transformers each terminated with a variable impedance, whose impedance...
4140982 Transistor microstrip oscillator and diode attenuator modulator  
An RF oscillator and modulator especially useful for UHF applications. The oscillator may comprise a series-tuned Colpitts circuit with the tuned circuit including microstrip transmission lines as...
4118598 Amplitude modulated impatt diode oscillator and a low cost communication system using same  
A low cost microwave communication system is described in which a transmitter including an IMPATT diode operating CW (Continuous Wave) is amplitude modulated by a video signal such that the...
3882425 Linear microwave modulator  
An apparatus for linearly modulating a microwave carrier signal by means of a modulation signal control loop. An RF carrier signal is modulated by a current-controlled pin diode, which in turn is...
3845485 NON-ROTATING ANTENNA  
This invention relates to a method of providing modulation within the distribution and mode generating cavity of a non-rotating antenna, which antenna radiates a rotating limacon radiation...
3739301 SINGLE DIODE SINGLE SIDEBAND MODULATOR  
A transmission line feeds a PIN diode with an information signal. A modulng signal biases the diode so as to switch the diode between forward and reverse bias at an r.f. frequency. The PIN diode...
3678395 BROADBAND PLANAR BALANCED CIRCUIT  
A broadband planar balanced circuit comprising the junction of slot-line and coplanar-line transmission media. The coplanar and slot lines are formed on one side of a conductively covered...
3649932 MICROPHONE COMPRISING LSA OSCILLATOR  
In one embodiment, an input signal is applied to an LSA oscillator circuit where it mixes with the oscillatory frequency fLSA to give a difference frequency fa that is amplified. In another...
3629729 HIGH-FREQUENCY DOUBLY BALANCED WIDE WAVEBAND RING-CONNECTED DIODE MODULATOR  
A very wide band high-frequency modulator is disclosed using ring-connected diodes in which the local oscillator and the signal frequency can be very different from each other. The modulator is...
3609559 COAXIAL MICROWAVE MODULATOR  
A microwave modulator is disclosed which takes the form of a microwave transmission line segment having a pair of diametrically opposed longitudinal slots cut in its outer conducting sheath....
3573660 BROADBAND, REFLECTION-TYPE SINGLE SIDEBAND MODULATORS  
A distributed parameter, single path, phase differential reflection circuit utilizes two nonlinear diodes to generate a single sideband signal with broadband power levels.
3541460 APPARATUS FOR INSERTING A SEMICONDUCTOR ELEMENT IN A WAVEGUIDE  
3512091 COMPACT STRIP-LINE TYPE MIXER USING HYBRID RING  
3492603 BROADBAND DOUBLY-BALANCED MIXER OR MODULATOR INCLUDING HYBRID CIRCUITS  
3443249 WAVE LIMITER CIRCUIT AND APPARATUS  
3407365 Hybrid ring modulator  
3335373 Apparatus for modulating guided electromagnetic waves  
3245007 Circuit for sideband microwave generator or receiver  
1,003,585. Single sideband amplitude modulation; semi-conductor circuits. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Oct. 2, 1963 [Oct. 11, 1962], No. 38557/62. Headings H3R and H3T. A Hall effect...
3243731 Microwave single sideband modulator  
3159798 Microwave modulator  
3121203 Semiconductor maser with modulating means  
3064210 Harmonic generator  
3048797 Semiconductor modulator  
2984795 Microwave applications of semiconductors  
2978652 Microwave modulator  
2977551 Microwave modulator  
834,465. Waveguide accessories. NATIONAL RESEARCH DEVELOPMENT CORPORATION. March 11, 1958 [March 18, 1957], No. 8775/57. Class 40 (8). [Also in Group XL (c)] A microwave modulator comprises a...
2950384 Microwave frequency converter  
2936429 Microwave suppressed carrier modulator  
2928056 Means for utilizing solid-state materials and devices for the electronic control of guided electromagnetic wave energy  
2914665 Semiconductor devices  
2872647 Microwave single-sideband modulator  
2783378 Modulation in a ridged wave guide  

Matches 1 - 50 out of 55 1 2 >