[SI-LIST] Re: 90 degree bend
- From: Vinu Arumugham <vinu@xxxxxxxxx>
- To: gstokes@xxxxxxxxx
- Date: Thu, 02 Sep 2004 08:57:45 -0700
LC (free download) from http://lc.cray.com too can characterize such
structures.
Thanks,
Vinu
Geoff Stokes wrote:
>Hi All
>
>No-one has mentioned the tools which can characterise 90 degree bends and
>other RF discontinuities on screen. These include, in roughly increasing
>order of cost:
>Eagleware Genesys
>AWR Microwave Office
>Agilent EEsof
>Cadence SpectreRF
>
>The effects are small but noticeable at about 1 GHz, increasing at higher
>frequencies. Some of these tools will be too expensive for some operations,
>but Eagleware do a personal version which does the job for around 1k
>dollars. The models are semi-empirical circuit equivalents which are very
>good up to 3 or 4 Ghz and are useful up to 10 GHz or possibly more. For
>best accuracy at high frequencies a 3D wave simulator is required, such as
>Ansoft HFSS or CST Microwave Studio.
>
>Cheers
>Geoff
>
>
>
>>-----Original Message-----
>>From: Grasso, Charles [mailto:Charles.Grasso@xxxxxxxxxxxx]
>>Sent: 30 August 2004 22:34
>>To: 'cpad@xxxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
>>Subject: [SI-LIST] Re: 90 degree bend
>>
>>
>>Chris,
>>
>>When signals have a rise time of 100pS or better
>>that translates to a bw of 3.5GHz (well into the
>>uwave region) - So aren't bends important in this case?
>>
>>Best Regards
>>Charles Grasso
>>Senior Compliance Engineer
>>Echostar Communications Corp.
>>Tel: 303-706-5467
>>Fax: 303-799-6222
>>Cell: 303-204-2974
>>Email: charles.grasso@xxxxxxxxxxxx;
>>Email Alternate: chasgrasso@xxxxxxxx
>>
>>
>>
>>-----Original Message-----
>>From: Chris Padilla [mailto:cpad@xxxxxxxxx]
>>Sent: Monday, August 30, 2004 10:23 AM
>>To: si-list@xxxxxxxxxxxxx
>>Subject: [SI-LIST] Re: 90 degree bend
>>
>>
>>I have yet to see any issue arising from bends described as
>>below. Simulation doesn't show much and neither does real
>>life. In the
>>microwave world, yes, they will need consideration.
>>
>>Chris Padilla
>>EMC Engineer
>>Cisco Systems
>>San Jose, CA
>>
>>At 09:20 PM 8/30/2004 +0530, Kanakaraj wrote:
>>
>>
>>>Hi,
>>>The simplest thing is that when you make 90 degree turns on the pcb
>>>track, the electron moving in it cannot make sudden turns..(
>>>
>>>
>>remember
>>
>>
>>>inertia of direction in physics and a bus making a 90 degree turn at
>>>full speed)... so some of the electrons will jump out of the
>>>
>>>
>>pcb track
>>
>>
>>>and will cause emi issues..
>>>
>>>and Andy, Andrew, Ray anderson and the seniors will give you more
>>>inputs on that. Well I am too like you. a beginner :-)
>>>Kanak
>>>
>>>----- Original Message -----
>>>From: "New Bee" <pcb_user@xxxxxxxxxxx>
>>>To: <si-list@xxxxxxxxxxxxx>
>>>Sent: Monday, August 30, 2004 5:19 PM
>>>Subject: [SI-LIST] 90 degree bend
>>>
>>>
>>>
>>>
>>>>Hi
>>>>
>>>>I am a new PCB designer.
>>>>
>>>>I have a silly doubt - really do not know if I ask it in
>>>>
>>>>
>>this forum.
>>
>>
>>>>why is it suggested not to have 90 degree bends for the
>>>>
>>>>
>>traces while
>>
>>
>>>routing ?
>>>
>>>
>>>>If some one can give me the electrical/electronics and
>>>>
>>>>
>>manufacturing
>>
>>
>>>reasons I will be greatful to them
>>>
>>>
>>>>If this is not the right forum to address this please let me know
>>>>where
>>>>
>>>>
>>>can I ask
>>>
>>>
>>>>Thanks in advance
>>>>Kam
>>>>
>>>>Yahoo! India Matrimony: Find your life partner online.
>>>>
>>>>
>>>>Yahoo! India Matrimony: Find your life partneronline.
>>>>
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>
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