The relation between the coupling cofficient and coupling bandwidth

hi everyone
i want to know the relation between the coupling cofficient and coupling bandwidth
in a combline or interdigital filter plz help
thank you

The maximum coupling occurs at the frequency that gives a quarter-wave coupling length λ/4.
The 3dB bandwidth is approximately 12% from maximum coupling.

hi im new here,
hello vfone, any equation to show the relation ship between coupling coefficient and coupling bandwidth
thanx

Hi citizen,

I know coupling factor, which is if you need 20 db coupling, your coupling factor will be C = 10^(-20/20) = 0.1

I think it will be your coupling coefficient.

Coupling bandwidth I believe is the 3 dB bandwidth where you can achieve the coupling.

I hope this is correct.

Thanks

hi tshah
can you give me the exact info about this ans you have given here becas i dint know about this,and one more thing that here both coupling factor and coupling coefficient both are same know ?

thank you

coupling bandwidth is the value that normalized coupling coe multiples bandwidth.
it divide f0 equal to coe.

you wrote:


is the equation will be like this

coupling bandwidth=cou_coeffi*bw;
cou_coeffi=coupling bandwidth/fo;
fo center frq write?[/quote]

Basically it is correct.

take a look at the fowllowing form

And you should also look at the papper

Coupling Bandwidth and Reflected Group Delay Characterisation of Microwave Bandpass

james cook wrote:

can you provide that paper in this forum if you have, i m searching for that.


thank you james cook,

[/quote]

This papper already have been uploaded to this forum, just search it.

yes
i got that paper and i came to know some
good points what i dont know upto now
thank you