8 way power divider at U band(40-60GHz) - RF Cafe Forums
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Post subject: 8 way power divider at U band(40-60GHz)
Unread post Posted: Wed Feb 02, 2005 5:52 pm
Joined: Wed Feb 02, 2005 5:45 pm
I want to design a 8 way power divider working at U band with 10% bandwidth
because I cannot find a commercial one for such high freqency. But as
the frequency increases, there are many problems, such as the size due
to fabrication limitation. So if anyone who has some idea on how to
design it, could you help me?
Thank you very much!
postPosted: Thu Feb 03, 2005 9:24 am
Thu Nov 04, 2004 9:02 pm
a MMIC 4-way wilkinson power divider around 35 GHz - normal design.
The bandwidth should not be a problem, wilkinson is reasonably broadband.
Keep the lines far apart and tune the lenghts to get a good isolation
in the desired band.
I think if you use a thick substrate, you
may be able to have wider lines for fabrication.
Fri Feb 04, 2005 12:29 am
Feb 02, 2005 5:45 pm
Hi, thank you very much for your
reply. But I have some questions. First, what is the dielectric contant
of the subtrate in your design? Second, did you follow the general design
rule for Wilkinson power divider or is there any trick?
Unread postPosted: Fri Feb 04, 2005 9:36 am
GaAs, dielectric contant of 12.9 on a 100um substrate. Design is fairly
the same. Since you will be routing the 2 arms (for a 2way PD), the
bends will add some length, so your total length will be little less
than quarter wavelength. Remember it was a MMIC design, I dont know
if there will be some issues if you do a hybrid MIC design.