1. With neat sketch, explain the operation of helical antenna? (16) 2. Obtain the expression for the

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1. With neat sketch, explain the operation of helical antenna? (16) 2. Obtain the expression for the field and the radiation pattern produced by a 2 element array of infinitesimal with distance of separation 1/2 and currents of unequal magnitude and phase shift 180 degree? (16) 3. Derive the expression for far field components of a small loop antenna. (16) 4. Derive the expression for electric field of a broadside array of n sources and also find the maximum direction minimum direction and half power point direction? (16) 5. Design a 4 element broadside array of 1/2 spacing between elements, the pattern is to be optimum with a side lobe level 19.1 db. Find main lobe maximum?

 
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