Circuit to add and substract two differential signals
First Claim
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1. An apparatus comprising:
- three quarter-wavelength differential transmission lines to couple two differential input ports to two differential output ports in a first manner; and
a quarter-wavelength differential transmission line to couple one of said two differential input ports to one of said two differential output ports in a second, different manner.
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Abstract
An electrical circuit to add and subtract differential input signals may be implemented using distributed differential transmission lines having a length substantially equal to one quarter of a wavelength of the differential input signals according to an effective electrical permeability of the transmission line. Alternatively, the electrical circuit may be implemented with lumped reactive elements.
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Citations
29 Claims
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1. An apparatus comprising:
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three quarter-wavelength differential transmission lines to couple two differential input ports to two differential output ports in a first manner; and
a quarter-wavelength differential transmission line to couple one of said two differential input ports to one of said two differential output ports in a second, different manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a first group of six reactive elements to couple two differential input ports to two differential output ports in a first manner;
a second group of two reactive elements to couple one of said two differential input ports to one of said two differential output ports in a second, different manner; and
a third group of four reactive elements, each to couple a positive terminal and a negative terminal of a respective one of said two differential input ports and said two differential output ports. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A communication device comprising:
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a dipole antenna;
a power amplifier coupled to said dipole antenna; and
a combiner coupled to said power amplifier, wherein said combiner includes at least;
three quarter-wavelength differential transmission lines to couple two differential input ports to two differential output ports in a first manner; and
a quarter-wavelength differential transmission line to couple one of said two differential input ports to one of said two differential output ports in a second, different manner. - View Dependent Claims (18, 19)
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20. A communication device comprising:
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a dipole antenna;
a power amplifier coupled to said dipole antenna; and
a combiner coupled to said power amplifier, wherein said combiner includes at least;
a first group of six reactive elements to couple two differential input ports to two differential output ports in a first manner;
a second group of two reactive elements to couple one of said two differential input ports to one of said two differential output ports in a second, different manner; and
a third group of four reactive elements,, each to couple a positive terminal and a negative terminal of a respective one of said two differential input ports and said two differential output ports. - View Dependent Claims (21, 22, 23, 24)
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25. A communication system comprising:
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a first communication device; and
a second communication device, said second communication device including at least;
a combiner including at least;
a first group of six reactive elements to couple two differential input ports to two differential output ports in a first manner;
a second group of two reactive elements to couple one of said two differential input ports to one of said two differential output ports in a second, different manner; and
a third group of four reactive elements, each to couple a positive terminal and a negative terminal of a respective one of said two differential input ports and said two differential output ports. - View Dependent Claims (26, 27, 28, 29)
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Specification