Oscillators – With distributed parameter resonator
Patent
1998-03-27
1999-10-19
Grimm, Siegfried H.
Oscillators
With distributed parameter resonator
331107DP, 331107G, H03B 914
Patent
active
059695781
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a waveguide oscillator for generating carrier waves in a waveguide having at least one semiconductor oscillating element and at least one transmitting antenna element.
Known waveguide oscillators for generating carrier waves in waveguides comprise a pole inserted into the waveguide, which functions as a transmitting/antenna element, and a semiconductor oscillating element that is inserted into the waveguide. The semiconductor oscillating element is arranged on the base for the waveguide inside area, and the pole is inserted between the housing surface of the semiconductor oscillating element and the opposite arranged waveguide surface, so that it can radiate freely into the waveguide inside area while in a perpendicular position. The semiconductor oscillating elements used in known waveguide oscillators are cased Gunn diodes, impatt diodes or similar, cased semiconductor elements, which can generate a HF oscillation when direct voltage is applied. With the known waveguide oscillators, the oscillator is adapted to the characteristic wave impedance of the waveguide by means of a quarter-wave short circuit. This short circuit consists of a waveguide segment that is closed off on one side and has a length of one fourth the wavelength of the carrier wave to be radiated. The pole with the semiconductor oscillating element is arranged at its open end. As a result of the production and assembly of the precision-mechanical parts, the known waveguide oscillators are relatively expensive. The semiconductor oscillating elements in the known waveguide oscillators can be used only as cased elements since they are affected by the contact pressure exerted by the pole. However, cased diodes are also very expensive when compared to non-cased chip diodes.
SUMMARY OF THE INVENTION
It is the object of the invention to create an economical waveguide oscillator, which makes it possible to generate carrier waves in a waveguide.
This object is solved according to the invention by a carrier wave oscillator designed as a planar slotted guide structure and arranged approximately perpendicular to the waveguide longitudinal axis in a cross-sectional surface of the elongated waveguide. The slotted guide structure has transmitting slotted guides that are connected in series with their open ends and a semiconductor oscillating element integrated into the slotted guide structure which bridges the interconnected open ends of the transmitting slotted guides where the transmitting slotted guides have the same resonance frequency. The slotted guide structure comprises at least one compensation slotted guide and the resonance frequency of the at least one compensation slotted guide deviates from the resonance frequency of the transmitting slotted guides. Direct voltage is supplied to the semiconductor oscillating element via an internal conductor surface and an external conductor surface which are separated galvanically in the slotted guide structure.
The invention has a frequency stability that is comparable to that of traditional waveguide oscillators, but for all that has a higher oscillator efficiency. The high-frequency output coupled out into the waveguide is therefore higher with the same direct voltage output. Low-cost chip diodes can be used since the invention permits a bond between the antenna elements and the diodes.
The oscillator according to the invention with its planar slotted guide structure is favorably suited for mass production since this structure can be produced through etching technology. The installation depth of the oscillator according to the invention can be kept favorably low since a quarter-wave short circuit for adapting the impedance is not absolutely required. If necessary, the oscillator output can be doubled for the same installation depth, in accordance with a modification of the invention that is characterized by the use of two semiconductor oscillating elements and a doubling of the antenna elements. Also, the oscillator output can be increased advant
REFERENCES:
patent: 4222014 (1980-09-01), Ondria
patent: 4890074 (1989-12-01), Ondria
patent: 4951006 (1990-08-01), Cohen
Daimler-Benz Aerospace AG
Grimm Siegfried H.
Spencer George H.
Voorhees Catherine M.
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