Traveling wave video detector
First Claim
1. Traveling wave video detector, comprising:
- an artificial transmission line formed by a planar array of elements including plural spaced diodes,a first transmission line connected to one of said diodes at the input side of said artificial transmission line,a terminating resistor and a second transmission line connected between another of said diodes which is at the output side of said artificial transmission line and the terminating resistor, the impedance of said terminating resistor being substantially equal to the characteristic impedance of the artificial transmission line,said diodes being interconnected in shunt by wires arranged in successive arcs in a plane, each wire having a length and diameter so as to form an inductance between adjacent diodes, each inductance being substantially equal to C×
Z02 where C is the parasitic junction capacitance of a diode and Z0 is the value of the characteristic impedance of the artificial transmission line.
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Accused Products
Abstract
A traveling wave video detector utilizing microwave integrated circuit techniques provides increased dynamic range, increased rf bandwidth up to 100 Ghz and improved impedance matching at high input power levels. The video detector comprises an artificial transmission line wherein the shunt elements are spaced semiconductor detector diodes which lie in a substantially common plane. In the microwave integrated circuit (MIC) embodiment, the diodes are interconnected by arc shaped wire inductance elements which also lie in a substantially common plane. The particular planar arrangement and location of elements in the present invention provides the desired dynamic range, impedance matching and rf bandwidth.
49 Citations
16 Claims
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1. Traveling wave video detector, comprising:
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an artificial transmission line formed by a planar array of elements including plural spaced diodes, a first transmission line connected to one of said diodes at the input side of said artificial transmission line, a terminating resistor and a second transmission line connected between another of said diodes which is at the output side of said artificial transmission line and the terminating resistor, the impedance of said terminating resistor being substantially equal to the characteristic impedance of the artificial transmission line, said diodes being interconnected in shunt by wires arranged in successive arcs in a plane, each wire having a length and diameter so as to form an inductance between adjacent diodes, each inductance being substantially equal to C×
Z02 where C is the parasitic junction capacitance of a diode and Z0 is the value of the characteristic impedance of the artificial transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification