Strip line compensated balun and circuits formed therewith

Claim 2

A compensated strip line unbalanced-to-balanced converter comprising: a substrate of an insulating material; an input line having (two) interconnected first and second strip line sections patterned substantially parallel each other on one side of said insulating substrate; a first output line on the opposIte side of said substrate in underlying the area of (one) the first of the sections of said input line; and a second output line on the same side of said substrate as said first output line underlying the area of the second strip line section of said input line.

Claim 3

A compensated strip line unbalanced-to-balanced converter as set forth in claim 1 wherein each of the strip line sections of said input line is approximately one-quarter wavelength long, and wherein the first strip line section includes a portion for receiving an input signal and the second strip line section is a reflective line.

Claim 4

A compensated strip line unbalanced-to-balanced converter as set forth in claim 2 wherein said first and second output lines are separated by an isolation gap.

Claim 5

A compensated strip line unbalanced-to-balanced converter as set forth in claim 2 wherein said isolation gap is approximately one-quarter wavelength long.

Claim 6

A compensated strip line unbalanced-to-balanced converter comprising: a substrate of an insulating material; a one-quarter wavelength input line patterned on said insulating substrate; a connecting strip line patterned on said substrate at one end of said one-quarter wavelength input line; a one-quarter wavelength reflective line patterned on said substrate at the end of said connecting strip line and substantially parallel to said one-quarter wavelength input line; and a ground plane formed on the reverse side of said insulating substrate covering the entire area of said lines and including an isolation gap halfway between and substantially parallel to said input line and said reflective line.

Claim 7

A compensated strip line unbalanced-to-balanced converter comprising: a substrate of an insulating material; a one-quarter wavelength input line patterned on said insulating substrate; a connecting strip line patterned on said substrate at one end of said one-quarter wavelength input line; a one-quarter wavelength reflective line patterned on said substrate at the end of said connecting strip line and substantially parallel to said one-quarter wavelength input line; and a ground plane formed on the reverse side of said insulating substrate covering the entire area of said lines and including an isolation gap halfway between and substantially parallel to said input line and said reflective line.

Claim 8

A compensated strip line unbalanced-to-balanced converter as set forth in claim 5 wherein said input and reflective lines are on the order of about 86 mils wide, to provide a 50-ohm input impedance.

Claim 9

A compensated strip line unbalanced-to-balanced converter as set forth in claim 5 wherein said isolation gap is on the order of about 150 mils wide and one-quarter wavelength long.

Claim 10

A compensated strip line unbalanced-to-balanced converter as set forth in claim 5 wherein said input lines, connective and reflective, are patterned substantially in a J-shape.

Claim 11

A strip line balanced mixer circuit comprising: a compensated strip line unbalanced-to-balanced converter having a local oscillator input connection and generating an output signal having two components displaced 180 electrical degrees, said converter including an input line having two strip line sections displaced substantially parallel to each other patterned on one side of an insulating substrate, and a ground plane formed on the opposite side of the insulating substrate in an area covering said input line having an isolation gap formed approximately halfway between and substantially parallel to the two strip line sections of said input line, and a mixer circuit having a first matching network connected to one component of the output signal of said converter and a second matching network connected to the second component of the output signal.

Claim 12

A strip line balanced mixer circuit comprising: a compensated strip line unbalanced-to-balanced converter having a local oscillator input connection and generating an output signal having two components displaced 180 electrical degrees, said converter including an input line having two strip line sections displaced substantially parallel to each other patterned on one side of an insulating substrate, and a ground plane formed on the opposite side of the insulating substrate in an area covering said input line having an isolation gap formed approximately halfway between and substantially parallel to the two strip line sections of said input line, and a mixer circuit having a first matching network connected to one component of the output signal of said converter and a second matching network connected to the second component of the output signal.

Claim 13

A balanced mixer as set forth in claim 9 wherein each of the two strip line sections of said input line are one-quarter wavelength long.

Claim 14

A strip line harmonic generator comprising: a compensated unbalanced-to-balanced converter patterned on an insulating substrate and generating an output signal having two components displaced 180 electrical degrees, a compensated balanced-to-unbalanced converter patterned on an insulating substrate and having two input signals displaced 180 electrical degrees, said converter including an input line having two strip line sections patterned substantially parallel each other on one side of the insulating substrate, a first output line patterned on the opposite side of said substrate in the area of the first strip line section of said input line, and a second output line patterned on the same side of said insulating substrate as said firsT output line in the area of the second strip line section of said input line, and a pair of diodes each connecting one output of said unbalanced-to-balanced converter to one input of said balanced-to-unbalanced converter.

Claim 15

A strip line harmonic generator comprising: a compensated unbalanced-to-balanced converter patterned on an insulating substrate and generating an output signal having two components displaced 180 electrical degrees, a compensated balanced-to-unbalanced converter patterned on an insulating substrate and having two input signals displaced 180 electrical degrees, said converter including an input line having two strip line sections patterned substantially parallel each other on one side of the insulating substrate, a first output line patterned on the opposite side of said substrate in the area of the first strip line section of said input line, and a second output line patterned on the same side of said insulating substrate as said firsT output line in the area of the second strip line section of said input line, and a pair of diodes each connecting one output of said unbalanced-to-balanced converter to one input of said balanced-to-unbalanced converter.

Claim 16

A harmonic generator as set forth in claim 11 wherein said balanced-to-unbalanced converter includes: an output line having two strip line sections patterned substantially parallel each other on the insulating substrate; a first input line patterned on the opposite side of the insulating substrate in the area of the first strip line section of said output line; and a second input line patterned on the same side of the insulating substrate as said first input line in the area of the second strip line section of said output line.

Claim 17

A strip line harmonic generator as set forth in claim 12 wherein the output lines of said unbalanced-to-balanced converter and the input lines of said balanced-to-unbalanced converter are separated by isolation gaps formed approximately midway between and substantially parallel to said lines.