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- From: 唐 玉明 <tangmbox@xxxxxxxxx>
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- Date: Tue, 22 Mar 2005 15:16:57 +0900 (JST)
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> si-list Digest Mon, 21 Mar 2005 Volume: 05 Issue:
> 132
>
> In This Issue:
> #1: From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #2: From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #3: From: Scott McMorrow <scott@xxxxxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #4: From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #5: From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #6: From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #7: From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #8: From: "chen, jinhua" <chen_jinhua@xxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
> #9: From: jaudet@xxxxxxxxxx
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
>
>
----------------------------------------------------------------------
>
> Msg: #1 in digest
> Date: Mon, 21 Mar 2005 10:15:59 -0800
> From: Ming Tsai <ming.tsai@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Microstrip line loss on
> Rogers 4350
>
> Hi Scott,
>
> Thanks for your message.
>
> I was measuring single-ended microstrip. My two SMA
> connectors were separ=
> ated
> about 2.75". All the traces (3", 5" and 7.5") had
> some curves and bends w=
> hich
> I can identify from TDR plots. The measured |S21|
> curves were pretty clea=
> n up
> to 15 GHz. The |S21| could be read as (including two
> SMA connectors)
>
> Trace Length |S21| @ 5GHz |S21| @ 10GHz
>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 3" -1.25 dB -1.98 dB
> 5" -1.92 dB -2.91 dB
> 7.5" -2.76 dB -4.35 dB
>
> So I estimated the trace loss by taking the delta
> and draw a linear line =
> on
> the chart. The trace bending would have some effect,
> but I did not expect=
> it
> to me the major concern. (Plus the 3" line is pretty
> straight).
>
> The return loss curves did show some deep resonance,
> but all below -20 dB
> (for all three lengths from 0-13 GHz). |S11| @ 10
> GHz are less than -25 d=
> B. I
> did not think any obvious concern there. If you
> wish, I can e-mail you th=
> e
> [S] data and plots separately.
>
> Thanks!
>
> Ming
>
> Scott McMorrow wrote:
>
> > Ming
> >
> > You didn't say whether you were measuring
> single-ended or differential
> > microstrip. Are your insertion loss curves clean
> and free of resonance=
> s
> > out to beyond 10 GHz? What does your return loss
> curve look like.
> > What's your return loss at 10 GHz.
> >
> > Something is obviously wrong, since your
> measurements imply a loss
> > tangent of around .011 rather than .004. I'd
> suspect something
> > structural in nature.
> >
> > scott
> >
> > Scott McMorrow
> > Teraspeed Consulting Group LLC
> > 121 North River Drive
> > Narragansett, RI 02882
> > (401) 284-1827 Business
> > (401) 284-1840 Fax
> >
> > http://www.teraspeed.com
> >
> > Teraspeed=AE is the registered service mark of
> > Teraspeed Consulting Group LLC
> >
> > Ming Tsai wrote:
> >
> > >Hi All,
> > >
> > >I am studying the microstrip line loss on 10 mil
> Rogers 4350 (Er =3D 3=
> .48,
> > >loss tangent =3D 0.004 @ 10 GHz). The trace width
> is 22 mils, with hal=
> f oz
> > >copper. From some transmission line calculator I
> expect to see 0.25dB
> > >/inch loss @ 10 GHz. However I measured under
> network analyzer and I g=
> ot
> > >the loss up to 0.5dB/inch @ 10 GHz.
> > >
> > >I did not have well-setup TRL calibration on
> board, but I took 3
> > >separate measurements from 3", 5" and 7.5" long
> microstrip lines, and
> > >estimated the delta to get 0.5dB/in loss. So I
> assume the edge-mounted
> > >SMA connector is not a factor. Also checked under
> TDR I saw 48 ohms of
> > >line impedance, which is within the spec. I also
> scratched out the
> > >solder mask which did not have any effect. I used
> full-wave tool to
> > >verify the radiation as well as skin effect, but
> no surprise the
> > >simulation showed that I should get about
> 0.25dB/in loss.
> > >
> > >Does anyone have similar experience or any
> suggestion? Thanks!
> > >
> > >Regards,
> > >
> > >Ming
> > >--
> > >Ming. Tsai
> > >Staff Hardware Development Engineer
> > >Product Technology - Hardware Design Group
> > >XILINX
> > >
> > >
> > >
> >
>
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