How to measure antenna bandwidth???Pls Help??
How to measure antenna bandwidth???Pls Help??
(OP)
Hi all friends,
I recently study the microstrip antenna, however, I have some problem, that is I really dont know the criteria for measuring its bandwidth.
Its formula for measurement:
voltage standing wave ratio(vswr) < 2
Bandwidth = {(S-1) / Qx (S power1/2)} x100%
Q= center freq / delta freq at certain level related to vswr
But I dont know why sometimes calculated at vswr =1.7 sometimes =1.8, whatever?????
For the formula, is S = vswr ??? as the book does not indicated clearly.........
Is that a standard to measure??
Thank you for your attentions!
Regards,
raymond
I recently study the microstrip antenna, however, I have some problem, that is I really dont know the criteria for measuring its bandwidth.
Its formula for measurement:
voltage standing wave ratio(vswr) < 2
Bandwidth = {(S-1) / Qx (S power1/2)} x100%
Q= center freq / delta freq at certain level related to vswr
But I dont know why sometimes calculated at vswr =1.7 sometimes =1.8, whatever?????
For the formula, is S = vswr ??? as the book does not indicated clearly.........
Is that a standard to measure??
Thank you for your attentions!
Regards,
raymond





RE: How to measure antenna bandwidth???Pls Help??
http://www.cebik.com/bw.html
etc. for more info
RE: How to measure antenna bandwidth???Pls Help??
Buding
RE: How to measure antenna bandwidth???Pls Help??
where the signal is 3db below maximum.
RE: How to measure antenna bandwidth???Pls Help??
RE: How to measure antenna bandwidth???Pls Help??
Ideally a Return Loss (reflection ) measurement with a min of 15 dB is your indicator of your highest frequency
RE: How to measure antenna bandwidth???Pls Help??
http://www.educatorscorner.com/experiments/pdfs/exp94/exp94b.pdf
http://www.swissatv.ch/documents/patch_slot_antenna.pdf
etc. for more info on the antenna bandwidth