Abstract:
The interior of a metal housing is divided by a dielectric substrate into two compartments. At least one of the compartments is kept air-tight. The substrate carries thereon a semiconductor active element chip for oscillation within the air-tight compartment and a dielectric resonator within the other compartment. The chip and the resonator, electromagnetically coupled with the chip, constitute a microwave oscillator whose oscillation frequency can be stabilized. A metal screw is threaded into that wall of the housing which defines the other compartment in a predetermined positional relationship to the resonator. The metal screw is rotatable to vary the distance between the screw and the resonator and, thereby, the oscillation frequency.
Abstract:
A microwave oscillator including a GaAs field effect transistor having a gate electrode, a drain electrode and a source electrode and disposed on a planar substrate. An elongated gate transmission line is connected to the gate electrode of the field effect transistor and disposed on the substrate and terminated by a matching impedance. An elongated drain transmission line is connected to the drain electrode of the field effect transistor and disposed on the substrate at a predetermined angle to the gate transmission line while an elongated source transmission line is connected to the source electrode and disposed on the substrate for providing the oscillating output. A dielectric resonator is disposed within an angle formed between the gate transmission line and the drain transmission line.
Abstract:
The oscillator according to the invention consists at least of: a body which has a determined geometric structure and is closed by an upper cover with a first tuning screw inserted there through and by a lower cover having inserted therethrough an output connector, a feed filter and preferably a second tuning screw; a resonator which is geometrically homogeneous with the said body structure and is arranged on the inner wall of the lower cover through a spacer; a microstrip also on the lower cover, arranged sideways but coupled with the resonator; a bipolar transistor or a field effect transistor; substrates preferably of fluorine polymers reinforced with fiber-glass; capacitor elements of radiofrequency block and of output by-pass; and resistances to bias, and feed the transistor and to terminate the microstrip.
Abstract:
Es wird ein Streifenle'ttungsdopplerrader (1) bestehend aus einem Hochfrequenzoszillator (3), Streifenleitern (5, 6), einem dielektrischen Resonator (2), einer Empfangsdiode (7), einer Antenne (4) und Bandsperren oder Tiefpaßfiltern (9,10) beschrieben. Die im Oszillator (3) erzeugte HF-Leistung gelangt über die Streifenleiter (5, 6) und den dielektrischen Resonator (2) sowohl zu der Empfangsdiode (7) als auch zu der Hochfrequenzabstrahlenden Antenne (4). Reflektierte Hochfrequenzsignale werden von der Antenne (4) ebenfalls empfangen und über den einen Streifenleiter (6) der Empfangsdiode (7) zugeführt, wo die reflektierte Leistung mit der direkt vom Oszillator (3) eingespeisten leistung überlagert wird. Das so erhaltene Dopplersignal wird über ein Tiefpaßfilter oder eine Bandsperre (9) nach außen in einen verstärker geleitet. Beschriebene Streifenleittungsdopplerradars (1) lassen sich als Bewegungsmelder, geschwindigkeitsmesser, Türöffner und Näherungsschalter verwenden.
Abstract:
The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first or a second impedance in response to a select signal having a voltage. Each of the first and second impedances are fixed independently of the select signal voltage such that the oscillating output oscillates at the first oscillating frequency when the first impedance is provided and oscillates at the second oscillating frequency when the second impedance is provided.
Abstract:
An arrangement for mechanically adjusting the oscillation frequency in a dielectric resonator oscillator which includes a base or support member, as a cover for the oscillator housing, involving two rotatable plates between which the aforesaid base is sandwiched. The base includes an opening extending therethrough, where a rotatable first plate overlies such opening on one side of the base, and a rotatable second plate overlies such opening on the opposite side of the base. The first rotatable plate includes an off-center opening adapted to receive a centrally disposed stem portion extending from the second rotatable plate, where a dielectric resonator is disposed off-center on the second rotatable plate and extends in an opposite direction to that of the stem portion. A fastening member encircles the stem portion and maintains the assembled rotatable first plate and rotatable second plate at a selected X and Y coordinate location. The oscillation frequency at such a coordinate location is fixed irrespective of any movement of the base.
Abstract:
An oscillator having a dielectric resonator and being electronically tuned in frequency by a varactor, in particular in the 22 GHz range, the oscillator comprising an active electronic component having negative resistance (17), at least two dielectric resonators (40, 41), and a substrate (13) on the surface of which there are three striplines (10, 11, 12), with the first and second striplines (10 and 11) being in line and having their adjacent ends connected to two respective electrodes of the active component (17). The third stripline (12) which runs parallel to the first two striplines (10, 11) is connected to the varactor (26), with all of the dielectric resonators (40, 41) being coupled to the first stripline (10).
Abstract:
A microwave oscillator having a dielectric resonator, in particular for use in the 22 GHz range, the oscillator comprising a negative resistance component (18) and a dielectric resonator (19) disposed on the surface of a substrate (13, 14) situated inside a housing (10), and the housing (10) being provided with a clearance situated over the dielectric resonator (19).
Abstract:
The oscillator according to the invention consists at least of: a body which has a determined geometric structure and is closed by an upper cover with a first tuning screw inserted therethrough and by a lower cover having inserted therethrough an output connector, a feed filter and preferably a second tuning screw; a resonator which is geometrically homogeneous with the said body structure and is arranged on the inner wall of the lower cover through a spacer; a microstrip also on the lower cover, arranged sideways but coupled with the resonator; a bipolar transistor or a field effect transistor; substrates preferably of fluorine polymers reinforced with fiber-glass; capacitor elements on radiofrequency block and on output by-pass; and resistances to bias, and feed the transistor and to terminate the microstrip.