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US 8,026,775 B2Granted
Decade bandwidth planar MMIC four port transformer
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorDavid E. Meharry
Life of this patent
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Abstract
A wide bandwidth planar four port MMIC transformer is provided by input diplexers which divide up the incoming signal into a high band and a low band, with the resulting signals coupled to high band and low band four port transformers implemented in one embodiment using spiral inductors and coupled lines, the outputs of which are combined using two output diplexers to provide a decade bandwidth transformer.
Claims10
A decade bandwidth four port device, comprising:
- a four port transformer having symmetry, reciprocity between two inputs and between two outputs and an inverting relationship from one input to each of the outputs thereof, said four port circuit including two pairs of coupled lines to provide a low band transformer and two pairs of coupled lines to provide a high band transformer;
- a pair of diplexers to divide up an input signal into a high band and a low band, the high band and low band signals being coupled to respective high band and low band transformers;
- and,
- a second pair of diplexers for combining the signal at the outputs of said transformers, whereby said four port transformer has a wide bandwidth provided by breaking up the input signals into overlapped bands and combining the resultant signals to provide a decade bandwidth at the outputs of said second pair of diplexers.
1 more element
A method for providing a decade bandwidth four port transformer, comprising the steps of:
- providing input diplexers to divide up an incoming signal into a high band and a low band for outputting respective high band and low band signals,
- coupling the high band and low band signals to respective high band and low band four port transformers;
- and,
- combining the outputs of said high band and low band four port transformer using two output diplexers.
1 more element
Dependencies are inferred from the claim text.