Inventor

YAMASHITA SADAHIKO

JP33 patents

Patents

33 patents

US4340975AJul 20, 1982

Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD156 citations99

US4553264ANov 12, 1985

Double superheterodyne tuner

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD71 citations96

US4506241AMar 19, 1985

Coaxial dielectric resonator having different impedance portions and method of manufacturing the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD67 citations96

US4423396ADec 27, 1983

Bandpass filter for UHF band

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD88 citations96

US4292610ASep 29, 1981

Temperature compensated coaxial resonator having inner, outer and intermediate conductors

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD68 citations96

US4726072AFeb 16, 1988

Microwave filter having means for capacitive interstage coupling between transmission lines

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD44 citations93

US4121182AOct 17, 1978

Electrical tuning circuit

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD35 citations93

US4536724AAug 20, 1985

Voltage-controlled oscillator having three or more varactor diodes

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD28 citations92

US4661998AApr 28, 1987

Double superheterodyne tuner

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD31 citations90

US4720688AJan 19, 1988

Frequency synthesizer

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD35 citations89

US4016568AApr 5, 1977

Method and system for measuring doppler frequency shift of an echo

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD36 citations88

US4631506ADec 23, 1986

Frequency-adjustable coaxial dielectric resonator and filter using the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD22 citations82

US4592095AMay 27, 1986

Microwave FET mixer arranged to receive RF input at gate electrode

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD21 citations82

US4583064AApr 15, 1986

Strip-line resonator

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD21 citations81

US4449108AMay 15, 1984

Band-stop filter for VHF-UHF band

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD19 citations81

US4389624AJun 21, 1983

Dielectric-loaded coaxial resonator with a metal plate for wide frequency adjustments

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD26 citations81

US4679003AJul 7, 1987

Frequency divider circuit and frequency synthesizer using the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD15 citations74

US4651344AMar 17, 1987

VHF-UHF mixer having a balun

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD17 citations74

US4638180AJan 20, 1987

Frequency divider circuits

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD6 citations74

US4590443AMay 20, 1986

Transistor oscillator with compensating circuit for variable collector-base capacitance

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD14 citations74

US4315333AFeb 9, 1982

Circuit arrangement for a wide-band VHF-UHF television double superheterodyne receiver

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD11 citations74

US4224587ASep 23, 1980

Comb-line bandpass filter

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD11 citations74

US4214217AJul 22, 1980

Electronic tuning circuit having image trapping element

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD13 citations74

US4059815ANov 22, 1977

Coaxial cavity resonator

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD16 citations74

US4437076AMar 13, 1984

Coaxial filter having a plurality of resonators each having a bottomed cylinder

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD14 citations73

US4412351AOct 25, 1983

Microwave mixing circuit

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD3 citations63

US4361820ANov 30, 1982

Hybrid microwave circuit

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD4 citations63

US4254390AMar 3, 1981

Compact electronic tuning device

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD2 citations63

US4214218AJul 22, 1980

Impedance matched tuning device having image trapping circuit

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD0 citations42

YAMASHITA SADAHIKO

Patents

Microwave mixing circuit and a VHF-UHF tuner having the mixing circuit

Double superheterodyne tuner

Coaxial dielectric resonator having different impedance portions and method of manufacturing the same

Bandpass filter for UHF band

Temperature compensated coaxial resonator having inner, outer and intermediate conductors

Double converter tuner

Wideband tuner for VHF, CATV and UHF television signals

Band stop filter and circuit arrangement for common antenna

Strip-line resonator and a band pass filter having the same

Microwave filter having means for capacitive interstage coupling between transmission lines

Electrical tuning circuit

Voltage-controlled oscillator having three or more varactor diodes

Double superheterodyne tuner

Frequency synthesizer

Method and system for measuring doppler frequency shift of an echo

Frequency-adjustable coaxial dielectric resonator and filter using the same

Microwave FET mixer arranged to receive RF input at gate electrode

Strip-line resonator

Band-stop filter for VHF-UHF band

Dielectric-loaded coaxial resonator with a metal plate for wide frequency adjustments

Frequency divider circuit and frequency synthesizer using the same

VHF-UHF mixer having a balun

Frequency divider circuits

Transistor oscillator with compensating circuit for variable collector-base capacitance

Circuit arrangement for a wide-band VHF-UHF television double superheterodyne receiver

Comb-line bandpass filter

Electronic tuning circuit having image trapping element

Coaxial cavity resonator

Coaxial filter having a plurality of resonators each having a bottomed cylinder

Microwave mixing circuit

Hybrid microwave circuit

Compact electronic tuning device

Impedance matched tuning device having image trapping circuit