Re: [SI-LIST] : Design Note on Right Angle Bends

Mark Randol ([email protected])
Fri, 10 Jul 1998 13:04:08 -0700

I've run some simulations, and the "extra width" at the
corner does look capacitive. Chamfering the corner
reduces this. If you look at the current flows this
is pretty easy to "see".

Another area that this is a concern is planar inductors.
One of the reasons that you will see them laid out in
round or octagonal shapes is that you have radiation
resistance in the corners from the charge acceleration
of having to change the path of travel by 90 degrees.
(Other effects such as loss of mutual inductance due to
parasitic interactions and increased length per unit
area are also reasons.)

Sure there are other effects that are more significant.
But as a prof of mine used to say, when you'd kill
for another 0.5dB of output power you take every trick
you can get!

Mark Randol, RF Measurements Engineer   | Motorola SPS, Inc.
(602)413-8052 Voice                     | M/S EL379
(602)413-4150 FAX                       | 2100 E. Elliot Road
[email protected]                | Tempe, AZ 85284
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