SATELLITE SIGNAL FREQUENCY TRANSLATION AND STACKING
First Claim
1. A switch element, comprising:
- an input port;
an output port;
an internal termination having an impedance of Z;
a first switch component having first variable impedance Z1 coupled between the input port and the internal termination; and
a second switch component having second variable impedance Z2 coupled between the input port and the output port;
wherein a means for controlling impedance controls the impedance of both the first switch component and the second switch component to maintain a substantially constant input impedance.
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Accused Products
Abstract
An outdoor satellite receiving unit (ODU) receives several independent satellite signals, selects two signals with a switch matrix, downconverts the two signals to a bandstacked signal with a high and a low band signal, and outputs the bandstacked signal on the same cable to receiver units. Several satellite signals can be selected in groups of two or more and output to independent receiver units. Signal selecting is performed at the received radio frequency (RF) and bandstacking is performed with a single downconversion step to an intermediate frequency (IF). Channel stacking on the same cable of more than two channels from several satellites can be achieved by using frequency agile downconverters and bandpass filters prior to combining at the IF output. A slow transitioning switch minimizes signal disturbances when switching and maintains input impedance at a constant value.
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Citations
20 Claims
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1. A switch element, comprising:
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an input port; an output port; an internal termination having an impedance of Z; a first switch component having first variable impedance Z1 coupled between the input port and the internal termination; and a second switch component having second variable impedance Z2 coupled between the input port and the output port; wherein a means for controlling impedance controls the impedance of both the first switch component and the second switch component to maintain a substantially constant input impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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a switch element, comprising; an input port; an output port; an internal termination having an impedance Z; a first switch component having first variable impedance Z1 coupled between the input port and the internal termination; and a second switch component having second variable impedance Z2 coupled between the input port and the output port; and a means for controlling the impedance of both the first switch component and the second switch component to maintain a substantially constant input impedance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification