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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 4658440 | Single balanced self-oscillating dual gate FET mixer A single balanced self-oscillating dual gate FET mixer includes two dual-gate FETs, a dielectric resonator, two transmission lines inductively coupled to the resonator and connected to the second gates of the two dual-gate FETs, an RF input, two RF matchi... | 04/14/1987 |
| 4637069 | Doubly balanced diode mixer comprising a ring modulator each leg of which comprises a high speed conventional diode in series with at least one diode of the "varactor" kind A doubly balanced mixer comprising a ring modulator each leg of which is formed by the series connection of a high speed switching diode and one or more diodes with low intrinsic resistance and with high accumulated charges, preferably of the "varactor" o... | 01/13/1987 |
| 4593411 | Diode mixer with bias control A diode mixer arrangement including a mixer stage connected for receiving a signal having a frequency to be converted and an oscillator signal having one of a plurality of preselectable oscillator frequencies. The mixer stage includes diodes arranged to b... | 06/03/1986 |
| 4509208 | Frequency conversion unit A frequency conversion unit comprising a local oscillator, first and second mixers, first and second hybrid circuits. The mixers receive, via the first hybrid circuit, local oscillation outputs from the local oscillator, and the second hybrid circuit rece... | 04/02/1985 |
| 4480337 | Transistor mixer and amplifier input stage A transistor mixer and amplifier input stage which includes a mixer and a differential amplifier whose gain is controlled by a voltage generated by an AGC circuit. Two transistors, each having a resistor connected in series with its emitter, are connected... | 10/30/1984 |
| 4461042 | Transistor balanced mixer A frequency mixer or converter which is applicable for use in superheterodyne radio frequency signal receivers and has good linearity characteristics as well as a low noise characteristic. The mixer utilizes a balanced transistor pair arrangement with an ... | 07/17/1984 |
| 4449245 | High gain balanced mixer An improved active balanced mixer for developing an IF signal by combining an RF signal and a local oscillator signal while providing high conversion gain. The mixer utilizes a series resonant circuit resonant at the IF frequency to reduce degenerative fe... | 05/15/1984 |
| 4435848 | Stripline microwave balanced mixer circuit A stripline tuning fork microwave balanced mixer circuit which includes two diodes (21, 22) and a differential transformer (61) whereby matching is accomplished in the differential transformer (61) and in the circuit arrangement between the differential a... | 03/06/1984 |
| 4412352 | Frequency conversion circuit A circuit arrangement for converting high frequencies to intermediate frequencies by mixing with a heterodyne frequency, wherein the high frequency signal input is connected to the signal output of the circuit arrangement via the primary winding of a pola... | 10/25/1983 |
| 4380830 | Microwave up-converter An up converter having on the one hand an ultrahigh-frequency ring receiving one of the waves to be mixed and on the other hand a transformer receiving the other wave to be mixed whose frequency is in the radio-electric range. The transformer is connected... | 04/19/1983 |
| 4375700 | Low frequency converter with isolated mixer sections A low frequency diode mixer is provided in combination with simple, compact transformer circuitry. A four diode mixer interconnects three dual transformers. The mixer has a pair of separate, isolated two diode sections commonly servicing the first transfo... | 03/01/1983 |
| 4367560 | Low frequency converter with diode quad mixer A low frequency, diode quad mixer is provided in combination with simple, compact transformer circuitry. A diode quad mixer bridge interconnects the secondary winding of a single transformer and the four secondary windings of a pair of dual transformers. ... | 01/04/1983 |
| 4365350 | Low frequency converter with diode pair mixer A low frequency, diode pair mixer is provided in combination with simple, compact transformer circuitry. A diode mixer bridge has a pair of diodes interconnecting secondary windings of single and dual transformers. The diodes are connected in series acros... | 12/21/1982 |
| 4334324 | Complementary symmetry FET frequency converter circuits A frequency converter uses first and second complementary symmetry FET's to perform respective oscillator and mixer functions. The first and second FET's are arranged with respective conduction channels connected in series. The oscillator function is perf... | 06/08/1982 |
| 4308473 | Polyphase coded mixer A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate fie... | 12/29/1981 |
| 4119914 | Double balanced mixer using single ferrite core Disclosed is a double balanced mixer using a novel single ferrite core construction. The core includes two apertures and a transformer is wound through each aperture. The two transformers are connected by diodes in the known manner to provide the mixer. T... | 10/10/1978 |
| 4079321 | Dual diode high conversion efficiency signal mixer A signal mixer utilizing two oppositely poled diodes, coupled to provide parallel operation at high frequencies and series operation at intermediate and low frequencies. This arrangement reduces the number of signals generated by the mixing process with a... | 03/14/1978 |
| 4063176 | Broadband high frequency mixer A broadband mixer has two separate tapered ground plane microstrip baluns associated with a first signal port and two separate tapered ground plane microstrip baluns associated with a second signal port together with a frequency converter or mixer portion... | 12/13/1977 |
| 4058771 | Double-balanced frequency converter A frequency converter of the type having a local oscillating stage for producing a local oscillating signal and a double-balanced type mixing stage provided with a first pair of inputs for receiving a signal to be frequency converted and a second pair of ... | 11/15/1977 |
| 4032850 | Coaxial balun with doubly balanced heterodyne converter A coaxial line has a conductive surrounding shield connected from a first to a second point thereon. The outer conductor of the coaxial line shield is discontinuous at an intermediate point inside the shield so that it has two intermediate ends or termina... | 06/28/1977 |
| 4032851 | Complementary symmetry FET mixer circuits Series connected field-effect transistors (FET's) of complementary conductivity types are employed to mix two input signals. The transistors are biased in their linear operating region and operate as common source amplifiers for the signals to be mixed. T... | 06/28/1977 |
| 3961264 | Linear frequency converter with gain independent of circuit parameters A frequency converter circuit includes an input voltage-to-current converter which delivers signal current to a tuned IF circuit via a current steering circuit controlled by a local oscillator. In a preferred embodiment voltage-to-current conversion is ef... | 06/01/1976 |
