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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: RF Connector Type ID
Date: Sun, 9 Jun 2024 23:15:44 +1000
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On 9/06/2024 8:19 pm, Cursitor Doom wrote:
> On Sat, 08 Jun 2024 17:06:18 -0700, john larkin wrote:
> 
>> On Sat, 8 Jun 2024 22:54:07 +0100, John R Walliker
>> <jrwalliker@gmail.com> wrote:
>>
>>> On 08/06/2024 22:47, John R Walliker wrote:
>>>> On 08/06/2024 20:43, john larkin wrote:
>>>>> On Sat, 8 Jun 2024 18:10:59 -0000 (UTC), Cursitor Doom
>>>>> <cd999666@notformail.com> wrote:

<snip>

>> Shining Star makes nice cheap edge-launch SMAs and SMBs. A proper pad
>> stack keeps things 50 ohms.
> 
> Could you possibly expand on that last sentence, please? I've never
> encountered a 'pad stack' before.

You need to manage the transition between 50R transmission line in the 
cable and the 50R trace in the board. Traces buried in the board can be 
non-dispersive, and you can work out how wide the trace has to be and 
how far from ground planes that carry the return current to get you 50R.

A connector on the edge of the board needs special care. The pad stack 
is a collection of metalised areas in the edge of the board that provide 
a more-or-less seamless transition.

-- 
Bill Sloman, Sydney


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