LINEAR ANTENNAS: ROLE OF CONDUCTORS• Dipole in free space, and a monopole of half the length above...

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LINEAR ANTENNAS: ROLE OF CONDUCTORS

LINEAR ANTENNAS NEAR CONDUCTORS: PRAD, RR, U,D

Directivity?• Dipole in free space, and a monopole of half the length above a perfect ground plane will have the same radiation intensity in the top‐half plane (since fields are identical).

• If the dipole emits power P, then the monopole emits power P/2, since the fields are zero in bottom hemisphere.

• Thus, , whereas for the monopole,

Radiation resistance?

• If the dipole emits power P, then the monopole emits power P/2, since the fields are zero in bottom hemisphere.

• Thus, , whereas for the monopole,

LINEAR ANTENNAS: ROLE OF CONDUCTORS• Dipole in free space, and a monopole of half the length above...

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