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June 1997

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From [log in to unmask] Wed Jun 25 11:
22:27 1997
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>From willli Wed Jun 25 10:
38:59 1997
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RE: RF Design
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Frank Hinojos wrote:

Gnd Vias every 1/20 wavelength is also important. Shielding
& Proximity is important for susceptibility on layout on
signals. eg 1.5GHz LO VCO input.

I am also involved in the design of RF circuit boards and
have had engineers insist on this type of ground connections
with out a good explanation of the electrical or physical
characteristics that drive this need. Could you elaborate on
the 1/20 wavelength rule? Our operating frequencies are
between 1040 MHz and 1090 MHz if this is necessary for
explanation.

Thank you in advance.

Jeffrey McGlaughlin
BFGoodrich Avionics Systems Inc.
1105 Schrock Road Suite 800
Columbus Ohio 43229-1174
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