Solution: How much power is emitted when using the adjusting circuit?

Problem Statement: Transmission and Antenna Systems

A 0.48520λ₀ dipole antenna is made to work at 4 GHz. The antenna is then connected to a 12 V voltage source which has an internal resistance of 25 Ω.

a) Make a diagram of the above system,

b) Is an impedance-matching circuit needed? If yes, where should the impedance circuit be inserted and make a diagram of the system with the adjusting circuit,

c) How many cm is the length of the dipole antenna above,

d) How much power is emitted when not using the adjusting circuit and

e) How much power is emitted when using the adjusting circuit?

Problem Answer:

a) see solution,

b) yes, see solution

c) The length of the dipole antenna is equal to 3.639 cm.

d) The power emitted when not using the adjusting circuit is equal to 1.0945 W.

e) The power emitted when using the adjusting circuit is equal to 1.44 W.

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