00:01
Hi, in this question they are asking us to design a 4 element broadside array with equal side load level of minus 20 decibels.
00:11
So we have the value of load level as minus 20 decibels relative to the peak value.
00:17
Now take the inter elements facing d as lambda by 2 and find the resulting bandwidth to null.
00:26
So here number of elements in the array that is n is given as 4 and equal side load level that is l is minus 20 decibels.
00:35
So we have 20 log of p as equals to minus 20 which is the value of l.
00:44
So from here we get the value of p as 0 .1.
00:48
So relative side load level is 2 pi by n.
00:54
So we can write the relative side load level that is lr as 2 pi by n.
01:01
So n is given as 4 so we can write this as 2 pi by 4 which gives this value as 1 .571.
01:09
Now the peak value will occur at theta equals to cos inverse minus alpha by beta times d and d is given as lambda by 2 and beta will be 2 pi by lambda...