1.5.16 Michael Kreiczer

You are invited to attend a lecture

By

Michael Kreiczer

(M.Sc. student under the supervision of Prof. Raphael Kastner

School of Electrical Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel

Generalized Physical Aperture, Scattering and Absorption in antennas

While the effective area is well defined from power considerations for arbitrary antennas, small and slender antennas do not have a clear definition of their physical aperture. To adjust the definition for the general case, we can generalize the definition of the physical aperture as the ratio between the incident power to the power density of the incident plane wave. With the proposed definition, we can also generalize the definition of the aperture efficiency, which is known from large aperture antennas.

We can now define the Ideal Antenna, as the antenna whose generalized physical aperture is equal to unity.

The definition of the generalized physical aperture can also be related to the power balance, which can be defined straightforwardly by using the Poynting theorem over the surface enclosing the receiving antenna.

We show the relation between the power balance and the Optical Theorem, and by using earlier papers we will relate the directivity of the scattered pseudo power of the Ideal Antenna, to its directivity in transmit mode.

The case of super directivity is also discussed, being a critical issue when considering maximum available directivity for a given physical structure.

Sunday, May 1, 2016, at 16:00

Room 032, Labs Building