Re: NEC-LIST:Rectangular Coax

Ron:

For a transmission line consisting of a single round center
conductor of diameter d in a square enclosure (shield) of side D,
the characteristic impedance Zo is given by:

Zo = [138*log(p) + 6.48 - 2.34A - 0.48B - 0.12C] * (e**(-1/2))
ohms

where p = D/d

and where

A = (1 + 0.405 * p**4) / (1 - 0.405 * p**(-4))

B = (1 = 0.163 * p**(-8)) / (1 - 0.163 * p**(-8))

C = (1 + 0.067 * p**(-12)) / (1 - 0.067 * p**(-12))

e is the banse of natural logarithms, and ** denotes
exponentiation.

You can find this, and more, in what used to be the engineer's
book of first resort, the ITT Reference Data for Radio Engineers.

Regards,

Jack

Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Phone: 585 442 3909
Fax: 585 442 2182
j.schanker_at_ieee.org

----- Original Message -----
From: "Marino, Ron" <ron.marino_at_rfsworld.com>
To: <nec-list_at_ee.ubc.ca>
Sent: Monday, February 25, 2002 7:58 AM
Subject: NEC-LIST:Rectangular Coax

| Can someone direct me on where to find design parameters for
rectangular
| coax.
|
| Thanks
|
|
| Ron Marino
| Advanced Product Development Manager
|
| Radio Frequency Systems, Inc.
| 2 Ryan Road
| Marlboro, NJ 07746-1899
|
| Phone 732 462 1880 x1746
| FAX 732 866 6918
| Cell 732 580 6059
|
| email Ron.Marino_at_rfsworld.com
|
|
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