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Gunders 30th March 2007 08:38 PM

Question of Definition: word for "humps" in filterresponse
 
2 Attachment(s)
I have attached a picture of a response for a bandpass filter where the blue line is S21(transmission) and red is S11(reflection). For S11 there are "humps" in the passband, marked with rings in the picture. My question are: "What are the technical/correct name for these "humps"?" So far I have called them lobes, is that the correct word to use?

Thank you

Ron E 31st March 2007 12:19 AM

I'm thinking "ripple", but what do you mean by transmission and reflection? What does the circuit look like?

edit:
Ah, antenna stuff....google rocks. I still think ripple is your answer.

OzMikeH 31st March 2007 01:44 AM

The shape is called a side lobe.

I notice the extremely high frequency.
If you're not an engineer with hundreds of thousands of dollars of test equipment it will never work right.

Gunders 31st March 2007 11:50 AM

Quote:

Originally posted by OzMikeH
The shape is called a side lobe.

I notice the extremely high frequency.
If you're not an engineer with hundreds of thousands of dollars of test equipment it will never work right.


So lobe is the correct word to use?

Well, I have expensive test equipment available. But I'm not going to do any measurements on a physical design for the response shown. But I have a design for a bandpass at 15GHz where I will do measurements of the frequency response.


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