Appeal No. 95-3742
Application 08/176,287
The disclosed invention relates to a high frequency
voltage controlled oscillator that includes a microstrip line
resonator,
and a trimming stub for adjusting the free-running frequency
of the oscillator by changing the inductance of the resonator.
The triming stub is located parallel to the resonator.
Claim 1 is the only independent claim on appeal, and it
reads as follows:
1. A high-frequency voltage controlled oscillator
comprising:
a capacitance circuit comprising a voltage controlled
variable capacitance element, a fixed capacitance element and
means for applying a control voltage to said voltage
controlled variable capacitance element;
a microstrip line serving as a resonator, said microstrip
line having a first end connected to said capacitance circuit
and a second end connected to ground; and
a trimming stub for adjusting a free-running frequency,
said trimming stub being provided in parallel with said
microstrip line so that an oscillation frequency of said high-
frequency voltage controlled oscillator is controlled in
accordance with said control voltage and said free-running
frequency is finely adjusted by using said trimming stub to
change an inductance of said microstrip line.
The reference relied on by the examiner is:
Stajcer 4,818,956 April 4, 1989
2
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