Circuit to add and subtract two differential signals
First Claim
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1. A combiner comprising:
- a circuit comprising 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;
wherein reactive elements of said first group and said second group have substantially equivalent inductive impedances and reactive elements of said third group have substantially equivalent capacitive impedances.
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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.
9 Citations
17 Claims
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1. A combiner comprising:
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a circuit comprising 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;
wherein reactive elements of said first group and said second group have substantially equivalent inductive impedances and reactive elements of said third group have substantially equivalent capacitive impedances. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 (9, 10, 11, 12)
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13. 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 (14, 15, 16, 17)
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Specification