Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A microwave element in which the impedance control is performed by using the capacitance of said FET in a state where said FET is off, comprising: a series connection circuit comprising a diode and a capacitor, connected in parallel with between a source and a drain of said FET; means for applying variable bias voltage to said diode; and said series connection circuit and variable bias voltage applying means constituting an impedance control circuit for controlling the capacitance between said source and said drain of said FET at off state.
Claim 2
Dependent Claim
90 words
A microwave element in which the impedance control is performed by using the capacitance of said FET in a state where said FET is off, comprising: a series connection circuit comprising a diode and a capacitor, connected in parallel with between a source and a drain of said FET; means for applying variable bias voltage to said diode; and said series connection circuit and variable bias voltage applying means constituting an impedance control circuit for controlling the capacitance between said source and said drain of said FET at off state.
Claim 3
Dependent Claim
122 words
A microwave element as defined in claim 1, which constitutes a microwave switch, comprising: a first and a second FET which are connected in series; a first and a second impedance control circuits, each comprising a series connection circuit comprising a diode and a capacitor, connected in parallel with between a source and a drain of said FET, and means for applying variable bias voltage to said diode, connected in parallel with between source and drain of said first and second FET, respectively; an input terminal which is connected with a connection node of said first and second FET; and a first and a second output terminal which are connected with the other end of said first and said second FET, respectively.
Claim 4
Dependent Claim
183 words
A microwave element as defined in claim 1, which constitutes a microwave switched-line type phase shifter, comprising: a first and a second transmission line with different electrical lengths which are arranged in parallel; a first and a second FET which are connected in parallel with each other, connected with the front and rear end of said first transmission line, respectively; a third and a fourth FET which are connected in series with said first and second FET, respectively; and in parallel with the front and rear end of said second transmission line; a first to a fourth impedance control circuit, each comprising a series connection circuit comprising a diode and a capacitor, connected in parallel with between a source and a drain of said FET, and means for applying variable bias voltage to said diode which are connected with between source and drain of said first to fourth FET, respectively; an input terminal which is connected with a connection node of said first and third FET; and an output terminal which is connected with a connection node of said second and fourth FET.
Claim 5
Dependent Claim
136 words
A microwave element as defined in claim 1, which constitutes a microwave loaded-line type phase shifter, comprising: a transmission line which is to be a main line; a first and a second loaded line with the same electrical length which are connected in parallel with each other, connected with the both ends of said main line, respectively; a first and a second FET which are connected between the end of said first and second loaded line and the ground; and a first and a second impedance control circuit, each comprising a series connection circuit comprising a diode and a capacitor, connected in parallel with between a source and a drain of said FET, and means for applying variable bias voltage to said diode, connected with between source and drain of said first and second FETs, respectively.
Claim 6
Dependent Claim
38 words
A microwave element including a field effect transistor, which element is characterised by: impedance means connected between source and drain of said transistor which means is adjustable to compensate for process variance in off-state capacitance of said transistor.
Claim 7
Dependent Claim
38 words
A microwave element including a field effect transistor, which element is characterised by: impedance means connected between source and drain of said transistor which means is adjustable to compensate for process variance in off-state capacitance of said transistor.
Claim 8
Dependent Claim
16 words
An element as claimed in claim 5, wherein said impedance means comprises a variable capacitance means.
Claim 9
Dependent Claim
24 words
An element as claimed in claim 6, wherein said impedance means consists in an inductor and said variable capacitance means connected in parallel therewith.