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Browse Prior Art Database

Broadband Pneumatic Switch

IP.com Disclosure Number: IPCOM000101423D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Rowley, LG: AUTHOR

Abstract

The need for a very small low cost switch having broadband transmission characteriscs (DC to 10 GHz) is filled by a compressed gas actuator attached over a switch formed on a printed circuit board. Such a switch has electrical resistance of <0.1 ohm when closed and high impedance (>100 megohms) when open.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 69% of the total text.

Broadband Pneumatic Switch

       The need for a very small low cost switch having
broadband transmission characteriscs (DC to 10 GHz) is filled by a
compressed gas actuator attached over a switch formed on a printed
circuit board.  Such a switch has electrical resistance of <0.1 ohm
when closed and high impedance (>100 megohms) when open.

      Referring to the figure, microstrip line 2 having width W and a
gap G is formed on printed circuit board 4.  Ground plane 6 in
circuit board 4 assures desired microstrip line impedance.  Spring
contact 8 is affixed to microstrip line 2, as shown.  Members 2 and 8
are gold plated to assure a low electrical resistance contact.
Pneumatic actuator housing assembly 10 is constructed of dielectric
material and is in contact with microstrip line 2 and another spacer
12, which may be another microstrip line.   Actuator assembly 10 may
be positioned on and fastened to circuit board 4 by any means, e.g.,
bolts (not shown).  Flexible membrane 14 is sealed at its edges to
the bottom of housing 10 and has a hard dielectric disc 16 affixed
near the center of membrane 14.  Cavity 18 above membrane 14 may be
pressurized by gas introduced via dielectric pipe 20 which is held in
place by an appropriate gas-tight sealing method.  When pressurized
gas is thus introduced, disc 16 applies force to close spring contact
8.  Atmospheric pressure is maintained below membrane 14 by assuring
that a gas-tight seal is not made between the bot...