Microwave oscillator

Claim 2

A microwave oscillator comprising a transmission line; an oscillation circuit including a solid oscillation element and connected to the transmission line at an intermediate point; a series circuit including an oscillation cut-off resistor having a smaller impedance than the characteristic impedance of said transmission line and a high-Q resonance circuit, said series circuit being connected to one end of the transmission line; and a reactive coupling means connected to the other end of the transmission line.

Claim 3

A microwave oscillator according to claim 1, wherein the transmission line comprises a main waveguide transmission line; the solid osciLlation element of the oscillation circuit is disposed in the main waveguide at a point spaced n lambda g/2 (where n is a positive integer and lambda g denotes the guide wavelength) from one end of the main waveguide; the high-Q resonance circuit comprises a cavity resonator bored with a first opening for connecting said circuit to the main waveguide; the oscillation stabilizing resistor comprises an electric wave absorbing substance filled in E-branch waveguides provided between the cavity resonator and main waveguide; and the reactive coupling means comprises an inductive element.

Claim 4

A microwave oscillator according to claim 2, wherein the inductive element is spaced substantially m lambda g/2 (where m is a positive integer) from the solid oscillation element of the oscillation circuit.

Claim 5

A microwave oscillator according to claim 3, wherein the solid oscillation element of the oscillation circuit comprises a Gunn diode oscillation element.

Claim 6

A microwave oscillator according to claim 2, wherein the inductive element comprises a short-circuiting plate fitted to the other end of the main waveguide so as to slide therethrough; and the high-Q cavity resonator is bored with a second opening for connecting said resonator to a load circuit.

Claim 7

A microwave oscillator according to claim 2, wherein the inductive element comprises a short-circuiting plate fitted to the other end of the main waveguide so as to slide therethrough; the solid oscillation element of the oscillation circuit comprises a Gunn diode oscillation element; and the high-Q cavity resonator is bored with a second opening for connecting said resonator to a load circuit.

Claim 8

A microwave oscillator according to claim 1, wherein the transmission line comprises a main waveguide transmission line; the solid oscillation element of the oscillation circuit is provided in the main waveguide; the high-Q resonator comprises a supplementary waveguide connected to the main waveguide at a point spaced n lambda g/2 (where n is a positive integer and lambda g denotes the guide wavelength) from the solid oscillation element of the oscillation circuit and a metal plate extending into the supplementary waveguide from its junction with the main waveguide, positioned parallel with the plane E and perpendicular to the plane H of said supplementary waveguide and bored with an opening so as to form a desired circuit pattern; the oscillation stabilizing resistor comprises an electric wave absorbing substance filled in E-branch waveguides provided at the junction of the main and supplementary waveguides; and the reactive coupling means comprises an inductive element.

Claim 9

A microwave oscillator according to claim 7, wherein the main and supplementary waveguides are integrally formed; and the inductive element comprises the short-circuiting terminal end of the main waveguide.

Claim 10

A microwave oscillator according to claim 7, wherein the main and supplementary waveguides are integrally formed; the inductive element comprises the short-circuiting terminal end of the main waveguide; and the solid oscillation element of the oscillation circuit comprises a Gunn diode.

Claim 11

A microwave oscillator according to claim 7, wherein the main and supplementary waveguides are integrally formed; and the inductive element is spaced m lambda g/2 (where m is a positive integer) from the solid oscillation element of the oscillation circuit.

Claim 12

A microwave oscillator according to claim 10, wherein the solid oscillation element comprises a Gunn diode.

Claim 13

A microwave oscillator according to claim 1, wherein the transmission line comprises a main waveguide transmission line; the solid oscillation element of the oscillation circuit is provided in the main waveguide; the high-Q resonator comprises a supplementary waveguide connected to the main waveguide at a point spaced n lambda g/2 from the solid oscillation element of the oscillation circuit, a metal plate extendinG into the supplementary waveguide from its junction with the main waveguide and positioned parallel with the plane E and perpendicular to the plane H of said supplementary waveguide so as to divide the supplementary waveguide into two microwave cut-off regions, and a dielectric resonance element provided in one of said microwave cut-off regions; the oscillation stabilizing resistor comprises an electric wave absorber provided in the other microwave cut-off region between the junction of the main and supplementary waveguides and the metal plate; and the reactive coupling means comprises an inductive element.

Claim 14

A microwave oscillator according to claim 12, wherein the main and supplementary waveguides are integrally formed; and the inductive element comprises the short-circuiting terminal end of the main waveguide.

Claim 15

A microwave oscillator according to claim 12, wherein the main and supplementary waveguides are integrally formed; the inductive element comprises the short-circuiting terminal end of the main waveguide; and the solid oscillation element comprises a Gunn diode.

Claim 16

A microwave oscillator according to claim 12, wherein the main and supplementary waveguides are integrally formed; and the inductive element is spaced n lambda g/2 from the solid oscillation element.

Claim 17

A microwave oscillator according to claim 15, wherein the solid oscillation element comprises a Gunn diode.

Claim 18

A microwave oscillator according to claim 1, wherein the transmission line comprises a main waveguide transmission line; the solid oscillation element of the oscillation circuit is provided in the main waveguide; the high-Q resonator comprises a supplementary waveguide connected to the main waveguide at a point spaced n lambda g/2 from the solid oscillation element, first and second metal plates extending into the supplementary waveguide from its junction with the main waveguide and positioned parallel with the plane E and perpendicular to the plane H of said supplementary waveguide so as to divide said supplementary waveguide into three microwave cut-off regions and a dielectric resonance element disposed in the central one of said three microwave cut-off regions; the oscillation stabilizing resistor comprises an electric wave absorbing substance provided in both electric wave cut-off regions between the first metal plate and the junction of the main and supplementary waveguides and also between the second metal plate and said junction respectively; and the reactive coupling means comprises the short-circuiting terminal end of the main waveguide.

Claim 19

A microwave oscillator according to claim 17, wherein the solid oscillation element comprises a Gunn diode.

Claim 20

A microwave oscillator according to claim 1, wherein the transmission line comprises a microwave transmitting strip line provided on one side of the insulation substrate; the solid oscillation element of the oscillation circuit is disposed between the microwave transmitting strip line and the metal film formed on the backside of the insulation substrate at a point spaced (2n - 1) lambda /4 (where n is a positive integer and lambda g denotes the guide wavelength) from one end of said micrwwave transmitting strip line; the reactive coupling means comprises a capacitive element provided at one end of the microwave transmitting strip line; the oscillation stabilizing resistor comprises a resisting element connected to the other end of the microwave transmitting strip line; the high-Q resonator comprises a dielectric resonance element provided on the insulation substrate at a point spaced m lambda g/2 (where m is a positive integer) from the solid oscillation element.

Claim 21

A microwave oscillator according to claim 19, wherein the oscillation element comprises a Gunn diode oscillation element.