| 摘要 |
A network apparatus whereby a high frequency transmission line may be switched and distributed to any one of a selected number of outputs without disturbing the characteristic impedance or continuity of the transmission line. Transmission strip lines on a printed circuit board connect each of the two outputs of a single pole double-throw reed relay to the single input of a subsequent double-throw relay. The relay switches and the transmission strip lines are parallel to an embedded ground plane within the printed circuit board. Each realy switch is surrounded by an electromagnetic shield which is connected at both its input end and its output end to the ground plane in the most direct fashion. Actuating means are provided proximate to each relay switch for activation purposes. Thus, a switching tree network may be provided whereby the single input line suitable for carrying high frequency signals, including digital signals having high rate rise times and high rate fall times, may be distributed to the relay switching tree to a selected single output of a plurality of outputs without changing the characteristic impedance of the transmission line.
|
