Just for sheer fun, I'm reading Complete Wireless Design by Cotter w.=20
Sayre.

I am puzzled by two of the author's statements concerning the theory of=20
calculating inductor and capacitance strip lengths.

The author states (for both)

' The length of the microstrip mustn't exceed 30 degrees in length of the=20
wavelength', then goes onto say this represents 12% of the wavelength.=20
Surely 30 degrees is 8.33% or am I getting my wavelengths versus degrees=20
confused?

For inductors the author makes the following statement a number of times in=
=20
the solution examples.

'Inductive reactance of a 1-nH capacitor is 36 ohms'.

I'm not puzzled by the 1nH figure or to the reactance of 36 ohms, it is the=
=20
reference (4 times) to the capacitor. I do see how there is lumped=20
capacitance, but is this just a typo repeated a number of times, or is the=
=20
mixing of the term nH's of capacitance correct as far as microstrips/lines=
=20
are concerned?

Luckily I have worked out how the author (is Cotter a male name?) arrives=20
at the wavelength formula of -  wavelength =3D 11800/f   - I'm assuming=20
conversion has been made from metric to imperial inches.

These two queries are going to bug me for the rest of the book, so any=20
elucidation would be gratefully received.

Colin

PS. I shall review the book later in OT.
--=20
cdb,   23/08/2010
=20
--




colin@btech-online.co.uk

--=20
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