High frequency signal switching device
AssigneeDX Antenna Company, Limited
InventorAkihiko Nagatomi
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Abstract
An improved high frequency signal changeover switch is provided for use especially as a horizontal-vertical selection switch in an artificial satellite broadcast receiving system for the purpose of selectively delivering either vertical or horizontal polarization signals received at its two inputs, respectively, from its single output. This inventive switch has such a significant feature over the prior art switches in that no mismatch occurs among all of these terminals.
Claims2
A high frequency signal changeover switch comprising first and second input terminals for receiving first and second high frequency input signals, respectively;
- an output terminal for delivering either of said input signals, selectively;
- a first pin diode connected between said first input terminal and said output terminal for responding to applied DC operation current of a first polarity to conduct and a second pin diode connected between said second input terminal and said output terminal for responding to applied DC operation current of a second polarity to conduct, a third pin diode connected in series with a first impedance means between said second input terminal and a reference potential point for creating a first dummy impedance in response to said DC operation current of a first polarity to match the impedance of the second input terminal and a fourth pin diode connected in series with a second impedance means between said first input terminal and said reference potential point for creating a second dummy impedance in response to said DC operation current of a second polarity to match the impedance of the first input terminal, said third and fourth pin diodes each being connected through individual impedance means.
Dependencies are inferred from the claim text.