US4954790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhanced coupled, even mode terminated baluns, and mixers and modulators constructed therefrom
Assignee: HP Inc
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Filing: 1989-11-15
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Granted: 1990-09-04
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Expires: 2009-11-15
Abstract
Abstract A balun section formed of a pair of transmission lines connected between separate pairs of corresponding input and output terminals with a pair of capacitors connected in series between the output terminals and another transmission line connected in series with a resistor between the circuit ground and the interconnection between the pair of capacitors. A multisection balun is constructed from a plurality of such balun sections connected in cascade. In one embodiment, the outputs of a pair of multisection baluns are supplied to a circuit such as a mixer or the like.
Inventors
- 👤 Richard G. Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:09
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03H; H03H7/00; H03H7/42; H03D2200/00; H03D2200/0001; H03D2200/0011; H03D2200/0013; H03D2200/0023; H03D7/00; H03D7/14; H03D7/1408
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
A balun section comprising: a circuit ground; first and second input terminals; first, second and third transmission lines; first and second output terminals; first and second capacitors; and a resistor; wherein the first and second capacitors are connected in series between the first and second output terminals and form a common node at the point that the first capacitor connects to the second capacitor, the third transmission line is connected in series with the resistor from the common node to the circuit ground, the first transmission line is connected between the first input terminal and the first output terminal, and the second transmission line is connected between the second input terminal and the second output terminal.
Claim 2
Dependent Claim
116 words
A balun section comprising: a circuit ground; first and second input terminals; first, second and third transmission lines; first and second output terminals; first and second capacitors; and a resistor; wherein the first and second capacitors are connected in series between the first and second output terminals and form a common node at the point that the first capacitor connects to the second capacitor, the third transmission line is connected in series with the resistor from the common node to the circuit ground, the first transmission line is connected between the first input terminal and the first output terminal, and the second transmission line is connected between the second input terminal and the second output terminal.
Claim 3
Dependent Claim
75 words
A multisection balun comprised of a plurality of balun sections as recited in claim 1, connected in series such that the multisection balun has third and fourth input terminals which are the first and second input terminals, respectively, of the first of the plurality of series connected balun sections and third and fourth output terminals which are the first and second output terminals, respectively, of the last of the plurality of series connected balun sections.
Claim 4
Dependent Claim
34 words
A system comprising a common circuit and a pair of multisection baluns as recited in claim 2 connected such that the third and fourth output terminals of each multisection balun drives the common circuit.
Claim 5
Dependent Claim
13 words
The system of claim 3 wherein the common circuit includes a high-pass filter.
Claim 6
Dependent Claim
78 words
The system of claim 4 wherein the high-pass filter comprises: a fourth transmission line; a third capacitor; a fourth capacitor; and wherein the fourth transmission line is connected between the third output terminal of one of the multisection baluns and the circuit ground, the third capacitor is connected in series with the third output terminal of the one multisection balun, and the fourth capacitor is connected in series with the fourth output terminal of the one multisection balun.
Claim 7
Dependent Claim
20 words
The system of claim 5 wherein the common circuit includes a diode quad having fifth, sixth seventh and eighth terminals.
Claim 8
Dependent Claim
64 words
The system of claim 6 wherein the fifth and sixth terminals are connected in series with the third and fourth capacitors to the third and fourth output terminals of the one multisection balun, respectively, and the seventh and eighth terminals are connected to the third and fourth output terminals, respectively, of the other of the pair of multisection baluns connected to the common circuit.
Claim 9
Dependent Claim
89 words
The system of claim 6 wherein the diode quad comprises: a first diode having an anode which is connected to the fifth terminal and a cathode connected to the seventh terminal; a second diode having an anode connected to the sixth terminal and a cathode connected to the eighth terminal; a third diode having a cathode connected to the fifth terminal and an anode connected to the eighth terminal; and a fourth diode having a cathode connected to the sixth terminal and an anode connected to the seventh terminal.
Claim 10
Dependent Claim
13 words
The system of claim 3 wherein the common circuit includes a low-pass filter.
Claim 11
Dependent Claim
26 words
The system of claim 3 wherein a seventh transmission line is connected from the third output terminal of the second multisection balun to the circuit ground.
Claim 12
Dependent Claim
64 words
The system of claim 8 wherein the common circuit includes a low-pass filter comprising: an intermediate frequency output terminal; a fifth transmission line connected between the fifth terminal and the intermediate frequency output terminal; a sixth transmission line connected between the sixth terminal and the intermediate frequency output terminal; and a fifth capacitor connected between the intermediate frequency output terminal and the circuit ground.
Claim 13
Dependent Claim
26 words
The system of claim 11 wherein a seventh transmission line is connected from the third output terminal of the second multisection balun to the circuit ground.
Claim 14
Dependent Claim
21 words
The balun section of claim 1 wherein the first transmission line is in closely spaced proximity to the second transmission line.
Claim 15
Dependent Claim
18 words
The balun section of claim 1 wherein the first transmission line is edge-coupled to the second transmission line.
Claim 16
Dependent Claim
23 words
The balun section of claim 1 wherein the first transmission line is in closely spaced proximity to[and edge-coupled with, the second transmission line.
Claim 17
Dependent Claim
32 words
The balun section of claim 15 wherein each capacitor comprises a capacitor pad having a maximum cross-dimension is less than one quarter of the frequency wavelength of the signal across the balun.
Claim 18
Dependent Claim
20 words
The balun section of claim 1 wherein the third transmission line and the resistor combine to form a transformed load.
Claim 19
Dependent Claim
37 words
The balun section of claim 17 wherein the length of one third transmission line and the resistance of the resistor are selected so that the transformed load substantially terminates even mode signal propagation and even mode resonance.
Claim 20
Dependent Claim
77 words
A balun section as recited in claim 1 wherein the lengths of the first, second and third transmission lines, and the values of the first and second capacitors and the resistor are selected so that a signal applied across the first and second input terminals will generate a first output signal at the first output terminal and a second output signal at the second output terminal which is of substantially equal amplitude to the first output signal.
Claim 21
Dependent Claim
34 words
The balun section of claim 19 wherein the transmission line lengths and the capacitor and resistor values are chosen in a manner to selectively and substantially terminate even mode signal propagation by the balun.
Claim 22
Dependent Claim
26 words
The balun section of claim 19 wherein the transmission line lengths and the capacitor and resistor values are chosen in a manner to selectively the balun.
Claim 23
Dependent Claim
34 words
The multisection balun of claim 2 wherein the transmission line lengths and the capacitor, and resistor values are chosen in a manner to selectively taper the impedance along the length of the multisection balun.
Claim 24
Dependent Claim
41 words
The balun section of claim 1 wherein the balun section is in the form of an integrated circuit with the first capacitor and the second capacitor comprising a capacitor pad which overlays the first transmission line and the second transmission line.
Claim 25
Dependent Claim
27 words
The balun section of claim 23 comprising a substrate having at least one planar side and wherein the integrated circuit is formed on the one planar side.
Claim 26
Dependent Claim
90 words
A multisection balun comprised of a plurality of balun sections as recited in claim 1 whereby the first and second and third transmission lines and the values of the first and second capacitors and the resistor, are selected in all balun sections, so that a signal applied across the third and fourth input terminals of the multisection balun will generate a first output signal at the third output terminal, and a second output signal at the fourth output terminal which is of substantially equal amplitude to the first output signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |