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Antennas III

1.              Radiation by large-aperture antenna shown in below.

2.                    Rectangular aperture

3.                    Antenna arrays

4.                    Effective area of a receiving antenna

In the last two lectures, we studied a number of antennas including Hertzian, ?/4 dipole, monopole, and dipole with arbitrary length. The problem for all these antennas are that the directivity is not good enough. For Radar or high bandwidth free space communication, we need deliver energy in a much confine fashion, this can be accomplished by a horn antenna