Re: Chebyshev Array
Hello Zorro,
Thanks very much for your reply, it is very helpful. Please refer to the design procedure on the notes attached, which I followed.
I am actually designing a 1x8 Chebyshev linear array with side-lobe level (SLL) of 40dB. The SLL was converted to magnitude by SLL="20"log(R), then substitute R into the Chebyshev polynomial. So the obtained coefficients are in voltage sense rather than power right?
If so, then the following are the calculated amplitude excitation coefficients defined in the E-field of each element:
6.3, 17.9, 32.6, 42.9, 42.9, 32.6, 17.9, 6.3
So I square them, then normalize by the peak value 42.9^2
This then yields
0.02, 0.18, 0.58, 1, 1, 0.58, 0.18, 0.02 (Please shout if I was wrong)
Would you kindly suggest any clever way to unequally split the power like the above? (2% power seems to be quite challenging to split using passive splitters) I believe a passive reactive power splitter will do the job, but we won't have isolation between the outputs. Maybe using Wilkinson power splitters? or branch line couplers? or better use tunable amplifiers? Thanks very much.
Best regards,
Chunwei