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Interference between Two Microwaves with Different Polarizations
New Physics: Sae Mulli 2017; 67: 88~93
Published online January 31, 2017;
© 2017 New Physics: Sae Mulli.

Choong Hwan LEE, Ju Eun PARK, Byoung Joo KIM, Myoungsik CHA*

Department of Physics, Pusan National University, Busan 46241, Korea
Correspondence to:
Received July 1, 2016; Revised October 31, 2016; Accepted November 11, 2016.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We used a dipole antenna detector to measure the interference fringes formed by crossing two polarized microwaves. In particular, we could observe, depending on the orientation of the detector, interference even when the polarizations were orthogonal, which was explained by the superposition of two plane electromagnetic (EM) waves. Our result does not agree with the conventional definition of the irradiance as the time-averaged magnitude of the Poynting vector of the total EM field. The discrepancy can be explained by the fact that in contrast to isotropic semiconductor photodetectors, a dipole antenna can detect a specific component of the electric field. We demonstrated that the interference of fast oscillating EM waves, including light, can be detected in different ways depending on the detector's characteristics.
PACS numbers: 42.25.Hz, 41.20.-q, 42.25.Ja
Keywords: Microwave interference, Detection of electromagnetic waves, Microwave polarization, Poynting vector

February 2017, 67 (2)