Microwave oscillator an low-noise converter using the same

A microwave oscillator for inducing parallel feedback from a collector to a base of a bipolar transistor, comprising:

• (a) a first microstrip line with a released end coupled to said base terminal,
• (b) a second microstrip line with a released end coupled to said collector terminal,
• (c) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line,
• (d) a high impedance line for bias supply to said base terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼, and
• (e) a high impedance line for bias supply to said collector terminal coupled at a position where the distance from the released end on said second microstrip line to the point closest to the center of said dielectric resonator is λg{fraction (2/4)},
• wherein λg1 and λg2 are a guide wavelengths of the first microstrip line and the second microstrip line respectively at the oscillation frequency of said microwave oscillator.

A microwave oscillator for inducing parallel feedback from a drain to a gate of a field effect transistor, comprising:

• (a) a first microstrip line with a released end coupled to said gate terminal,
• (b) a second microstrip line with a released end coupled to said drain terminal,
• (c) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line, and
• (d) a high impedance line for bias supply to said gate terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼,
• wherein λg1 is a guide wavelength of the first microstrip line at an oscillation frequency of said microwave oscillator.

A microwave oscillator for inducing parallel feedback from a drain to a gate of a field effect transistor, comprising:

• (a) a first microstrip line with a released end coupled to said gate terminal,
• (b) a second microstrip line with a released end coupled to said drain terminal,
• (c) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line,
• (d) a high impedance line for bias supply to said gate terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼, and
• (e) a high impedance line for bias supply to said drain terminal coupled at a position where the distance from the released end on said second microstrip line to the point closest to the center of said dielectric resonator is λg{fraction (2/4)},
• wherein λg1 and λg2 are a guide wavelengths of the first microstrip line and the second microstrip line respectively at the oscillation frequency of said microwave oscillator.

A low-noise converter incorporated in a microwave receiving antenna comprising:

• (a) a waveguide for transmitting a satellite signal received in said receiving antenna,
• (b) a waveguide probe for converting the satellite signal in said waveguide into a microstrip line mode,
• (c) a low-noise amplifier of which input port is coupled to said waveguide probe,
• (d) a mixer for receiving an output signal of said low-noise amplifier, and
• (e) a local oscillator of which output port is coupled to said mixer,
• wherein said local oscillator includes a microwave oscillator for inducing parallel feedback from collector to a base of a bipolar transistor, comprising:
• (i) a first microstrip line with a released end coupled to said base terminal,
• (ii) a second microstrip line with a released end coupled to said collector terminal,
• (iii) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line, and
• (iv) a high impedance line for bias supply to said base terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼,
• wherein λg1 is a guide wavelength of the first microstrip line at an oscillation frequency of said microwave oscillator.

A low-noise converter incorporated in a microwave receiving antenna comprising:

• (a) a waveguide for transmitting a satellite signal received in said receiving antenna,
• (b) a waveguide probe for converting the satellite signal in said waveguide into a microstrip line mode,
• (c) a low-noise amplifier of which input port is coupled to said waveguide probe,
• (d) a mixer for receiving the output signal of said low-noise amplifier, and
• (e) a local oscillator of which output port is coupled to said mixer,
• wherein said local oscillator includes a microwave oscillator for inducing parallel feedback from a collector to a base of a bipolar transistor, comprising:
• (i) a first microstrip line with a released end coupled to said base terminal,
• (ii) a second microstrip line with a released end coupled to said collector terminal,
• (iii) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line,
• (iv) a high impedance line for bias supply to said base terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼, and
• (v) a high impedance line for bias supply to said collector terminal coupled at a position where the distance from the released end on said second microstrip line to the point closest to the center of said dielectric resonator is λg{fraction (2/4)},
• wherein λg1 and λg2 are a guide wavelengths of the first microstrip line and the second microstrip line respectively at the oscillation frequency of said microwave oscillator.

A low-noise converter incorporated in a microwave receiving antenna comprising:

• (a) a waveguide for transmitting a satellite signal received in said receiving antenna,
• (b) a waveguide probe for converting the satellite signal in said waveguide into a microstrip line mode,
• (c) a low-noise amplifier of which input port is coupled to said waveguide probe,
• (d) a mixer for receiving the output signal of said low-noise amplifier, and
• (e) a local oscillator of which output port is coupled to said mixer,
• wherein said local oscillator includes a microwave oscillator for inducing parallel feedback from a drain to a gate of a field effect transistor, comprising:
• (i) a first microstrip line with a released end coupled to said gate terminal,
• (ii) a second microstrip line with a released end coupled to said drain terminal,
• (iii) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line, and
• (iv) a high impedance line for bias supply to said gate terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼,
• wherein λg1 is a guide wavelength of the first microstrip line at an oscillation frequency of said microwave oscillator.

A low-noise converter incorporated in a microwave receiving antenna comprising:

• (a) a waveguide for transmitting a satellite signal received in said receiving antenna,
• (b) a waveguide probe for converting the satellite signal in said waveguide into a microstrip line mode,
• (c) a low-noise amplifier of which input port is coupled to said waveguide probe,
• (d) a mixer for receiving the output signal of said low-noise amplifier, and
• (e) a local oscillator of which output port is coupled to said mixer,
• wherein said local oscillator includes a microwave oscillator for inducing parallel feedback from a drain to a gate of a field effect transistor, comprising:
• (i) a first microstrip line with a released end coupled to said gate terminal,
• (ii) a second microstrip line with a released end coupled to said drain terminal,
• (iii) a dielectric resonator electromagnetically coupled to said first microstrip line and said second microstrip line,
• (iv) a high impedance line for bias supply to said gate terminal coupled at a position where a distance from the released end on said first microstrip line to a point closest to a center of said dielectric resonator is λg¼, and
• (v) a high impedance line for bias supply to said drain terminal coupled at a position where the distance from the released end on said second microstrip line to the point closest to the center of said dielectric resonator is λg{fraction (2/4)},
• wherein λg1 and λg2 are a guide wavelengths of the first microstrip line and the second microstrip line respectively at the oscillation frequency of said microwave oscillator.