Question

Q2. A Hertzian dipole antenna that is small in relation to the wavelength can be shown to have radiation resistance: $R_{rad} = 80pi^2 left(frac{dl}{lambda} ight)^2$ where dl is the length of the antenna. A half-wavelength dipole antenna can be shown to have $R_{rad} = 73Omega$. (a) What is meant by the term 'radiation resistance'? (b) Calculate the total radiated power from both a half-wavelength dipole antenna and a small dipole whose length is $1/20^{th}$ of a wavelength for an RMS input current of 10mA. (c) With reference to this result, which antenna would be better for broadcasting a radio signal?

          Q2. A Hertzian dipole antenna that is small in relation to the wavelength can be shown to have
radiation resistance:
$R_{rad} = 80pi^2 left(frac{dl}{lambda}
ight)^2$
where dl is the length of the antenna. A half-wavelength dipole antenna can be shown to
have $R_{rad} = 73Omega$.
(a) What is meant by the term 'radiation resistance'?
(b) Calculate the total radiated power from both a half-wavelength dipole antenna and a
small dipole whose length is $1/20^{th}$ of a wavelength for an RMS input current of 10mA.
(c) With reference to this result, which antenna would be better for broadcasting a radio
signal?

$Q2. A Hertzian dipole antenna that is small in relation to the wavelength can be shown to have radiation resistance: Rrad = 80pi^2 left(fracdllambda ight)^2 where dl is the length of the antenna. A half-wavelength dipole antenna can be shown to have Rrad = 73Omega. (a) What is meant by the term 'radiation resistance'? (b) Calculate the total radiated power from both a half-wavelength dipole antenna and a small dipole whose length is 1/20^th of a wavelength for an RMS input current of 10mA. (c) With reference to this result, which antenna would be better for broadcasting a radio signal?$

Added by Shawn A.

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