Peak power of a circulator

[bjbdts]

Hi, everyone:
I am a little confused about the power specifications about a RF circulator: The Avg value can be so much difference from the Peak value, for example, a circulator with avg 150W, its peak value can be 750W. So if I need a 200W circulator, can I use the circulator with avg 150W and peak 750W?
Any suggestion?

Thanks,
bj

 

[itsmoked]

bjbdts; Usually Avg and Peak mean the same thing on any device. Just what they say....

Average: Is the amount of power that can be continuously dealt with without the device slagging down. (by whatever method that device slags down) This is the value that is heavily dependant on the installation of the device. Such as a power transistor rated at 150W. It had better be affixed to a properly sized and designed heat sink residing in a proper air flow or failure will occur (soon).

Peak: This is the maximum power the device can absorb before immediate change in the device's characteristics will occur. The changes can range from a shift in characteristics like gain or resistance up to and including the characteristic of letting out all the smoke.

A peak rating also infers that you can run at the peak rating as long as the mathematical Average is not exceeded. Keeping in mind that the average must be over some time period. (Since one day on and one day off is theoretically only a 50% average.) Usually if no time period is given you need to make an estimated guess. Perhaps 1 second?

So to answer your question.. Yes, you can use that circulator at 200W AS LONG AS THE AVERAGE POWER REMAINS BELOW 150W.

 

[bjbdts]

Thanks itsmoked,
I spoke to a technical support regarding this question, the answer is no because my operating time of high power (bigger than 150W) will have to be several minutes, and the product peak power period requirement is milliseconds.
I'm wondering if anybody here knows any supplier can supply a circulator with below requirement:
Freq: 2.3-2.4GHz
power: 200W Avg.
Isolation: 20dB
I checked on websites of a lot of companies in CA area but couldn't find anyone.

bj

 

[pstuckey]

Take a look at Renaissance

http://www.rec-usa.com

part number 3A4NO. It is advertised as 400 W although there is no indication whether that is peak or average.

If that doesn't pan out, I've had good luck getting custom circulators from Channel Microwave

http://www.channelmicrowave.com.

They don't have a high power catalog part for 2.3-2.4 GHz, but they do have 400 W Average (20 kW peak) circulators above and below your frequency, and it is possible they could base yours off of one of those.

Peter

 

[fsmyth]

Microwave Associates used to make (or carry) isolators and
circulators up to (and probably over) 1000W.
Check and see if they are still in business.
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