Compact microstrip hybrid coupled input multiplexer
First Claim
1. A multiplexer comprising:
- an input and a plurality of outputs, anda filter channelizer comprising at least two output filters, each output filter being coupled with a respective hybrid coupler, each respective hybrid coupler comprising an input port (port
1), two output ports (ports 2 and
3) and an isolated port (port
4);
wherein;
the multiplexer is configured to channelize an input radio frequency (RF) band of electromagnetic energy into a set of output channels by way of the filter bank;
each output filter is coupled with a respective one of the plurality of multiplexer outputs;
an input of each output filter is coupled to a first one of the two output ports of the respective hybrid coupler, a second one of the two output ports of the respective hybrid coupler being connected to a reflective open stub transmission line; and
the respective hybrid coupler is coupled in a daisy chain, by way of port 1 and port 4, with one or more of the input of the multiplexer, and at least one other respective hybrid coupler in the daisy chain.
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Abstract
A multiplexer includes a filter channelizer having at least two output filters, each output filter being coupled with a respective hybrid coupler. The multiplexer channelizes an input radio frequency (RF) band of electromagnetic energy into a set of output ports. Each hybrid coupler includes an input port (port 1), two output ports and an isolated port (port 4). Each output filter is coupled to a first one of the two output ports of a respective hybrid coupler, a second one of the two output ports being connected to an open stub microstrip transmission line. The respective hybrid coupler is coupled in a daisy chain, by way of port 1 and port 4, with one or more of the input of the multiplexer, and at least one other hybrid coupler. Advantageously, each output channel may include no more than one filter and no more than one hybrid coupler.
44 Citations
20 Claims
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1. A multiplexer comprising:
-
an input and a plurality of outputs, and a filter channelizer comprising at least two output filters, each output filter being coupled with a respective hybrid coupler, each respective hybrid coupler comprising an input port (port
1), two output ports (ports 2 and
3) and an isolated port (port
4);
wherein;the multiplexer is configured to channelize an input radio frequency (RF) band of electromagnetic energy into a set of output channels by way of the filter bank; each output filter is coupled with a respective one of the plurality of multiplexer outputs; an input of each output filter is coupled to a first one of the two output ports of the respective hybrid coupler, a second one of the two output ports of the respective hybrid coupler being connected to a reflective open stub transmission line; and the respective hybrid coupler is coupled in a daisy chain, by way of port 1 and port 4, with one or more of the input of the multiplexer, and at least one other respective hybrid coupler in the daisy chain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A spacecraft communications payload system comprising at least one input multiplexer, the at least one input multiplexer comprising:
-
an input and a plurality of outputs, and a filter bank comprising at least two output filters, each output filter being coupled with a respective hybrid coupler, each respective hybrid coupler comprising an input port (port
1), two output ports (ports 2 and
3) and an isolated port (port
4);
wherein;the multiplexer is configured to channelize an input radio frequency (RF) band of electromagnetic energy into a set of output channels by way of the filter bank; each output filter is coupled with a respective one of the plurality of multiplexer outputs; an input of each output filter is coupled to a first one of the two output ports of the respective hybrid coupler, a second one of the two output ports of the respective hybrid coupler being connected to a reflective open stub transmission line; and the respective hybrid coupler is coupled in a daisy chain, by way of port 1 and port 4, with one or more of the input of the multiplexer, and at least one other respective hybrid coupler in the daisy chain. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification