Re: RF power combiner

From	Bill Sloman <bill.sloman@ieee.org>
Newsgroups	sci.electronics.design
Subject	Re: RF power combiner
Date	2025-10-24 18:17 +1100
Organization	A noiseless patient Spider
Message-ID	<10df97e$2dr0m$1@dont-email.me> (permalink)
References	<10da59f$gcuu$1@dont-email.me> <9e7603ff-39e9-bfc5-612c-c30bb27679eb@electrooptical.net>

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On 24/10/2025 7:48 am, Phil Hobbs wrote:
> On 2025-10-22 04:40, Jeroen Belleman wrote:
>> While musing over a text about transmission line transformers,
>> combiners, splitters and so on, I came up with a power combiner
>> that promises a bandwidth spanning from some kHz well into the
>> GHz domain, with good isolation between input ports, and that
>> does _not_ have a null where its transmission lines are half a
>> wavelength long.
>>
>> I could find no other examples of this arrangement. The usual
>> combiners are wire- or coax- wound transformers, with 3 decade
>> bandwidths in the 100kHz-100MHz ballpark, or Wilkinson things
>> that only begin to work above half a GHz.
>>
>> This design should be able to work from a few kHz up to well
>> into the GHz domain. Anyway, for what it's worth, here it is.
>>
>> Jeroen Belleman
>>
>> =========================
>>
>> Version 4
> <snip>
> 
> That is one weird-ass combiner, for sure.  Looks like it has to be made 
> out of coax, on account of the switcheroo in the grounds.

Why not go the whole hog and wind it with semi-rigid coax - RG405 - and 
use SMA soldered coax sockets. Even RG405 is 2.2mm OD so you might not 
be able to get in enough turns to get down to 100KHz, but it would look 
serious.

-- 
Bill Sloman, Sydney

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RF power combiner Jeroen Belleman <jeroen@nospam.please> - 2025-10-22 10:40 +0200
  Re: RF power combiner Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-10-23 16:48 -0400
    Re: RF power combiner Jeroen Belleman <jeroen@nospam.please> - 2025-10-24 00:39 +0200
      Re: RF power combiner Joe Gwinn <joegwinn@comcast.net> - 2025-10-24 08:51 -0400
        Re: RF power combiner Jeroen Belleman <jeroen@nospam.please> - 2025-10-24 19:21 +0200
        Re: RF power combiner Bill Sloman <bill.sloman@ieee.org> - 2025-10-25 04:22 +1100
      Re: RF power combiner Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-10-24 13:17 +0000
        Re: RF power combiner Jeroen Belleman <jeroen@nospam.please> - 2025-10-24 19:15 +0200
          Re: RF power combiner Bill Sloman <bill.sloman@ieee.org> - 2025-10-25 14:49 +1100
        Re: RF power combiner Joe Gwinn <joegwinn@comcast.net> - 2025-10-24 15:33 -0400
        Re: RF power combiner john larkin <jl@glen--canyon.com> - 2025-10-24 12:48 -0700
    Re: RF power combiner Bill Sloman <bill.sloman@ieee.org> - 2025-10-24 18:17 +1100

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