Patent ID: 6600381
Filing Date: 2003-07-29
Classification: H03B

Abstract:
A microwave voltage controlled oscillator comprising:a negative resistance circuit having an input terminal and an output terminal; a strip shaped resonator having a first terminal and a second terminal, said first terminal of said strip shaped resonator being connected to said input terminal of said negative resistance circuit; a first capacitor having a first terminal and a second terminal, said first terminal of said first capacitor being connected to said second terminal of said strip shaped resonator; a variable capacitance diode having an anode and a cathode, said anode of said variable capacitance diode being connected to said second terminal of said first capacitor, and said cathode of said variable capacitance diode being grounded; a strip shaped line having a high impedance, a first terminal, a second terminal, and a length, the length of said strip shaped line being shorter than Â¼ wavelength, and equal to or longer than {fraction (1/14)} wavelength, said first terminal of said strip shaped line being connected to said anode of said variable capacitance diode; and a second capacitor having a first terminal and a second terminal, said second capacitor having sufficiently low impedance at oscillation frequency, said first terminal of said second capacitor being connected to said second terminal of said strip shaped line, and said second terminal of said second capacitor being grounded, wherein a capacitance of said variable capacitance diode is inversely proportional to a control voltage raised to the power of equal to or greater than Â½ and less than 2.