1. 2006 final-term examination (105)
Antenna Engineering
Date: December 12, 2006.
1. Consider a microstrip patch antenna for 5 GHz. (75)
1)Design a microstrip patch ( l × w ) for ε r = 2.2 (10). (Hint) λ g = λ
2)Perform the impedance matching ( Z T , lT ) of a microstrip patch antenna,
when Z in = 250Ω and Z o = 50Ω . (20)
3)Draw approximately the microstrip patch antenna (
l , w, Z 0 , Z T , lT ) described
in 1) and 2) (10)
4)Explain the design procedures for a microstrip patch antenna. (20)
5)Explain a good substrate for antenna application in terms of bandwidth, size,
and efficiency. (15)
2. Consider an array antenna. (30)
1)Why do we still design an array antenna even though a single antenna is
good? (10)
2)Explain that an array factor and an element pattern. (20)