What is it about?
Combined with the radiation theory of the microstrip antenna, a way to broaden the beam-width is proposed as follows: The vertical current distributed on the electric walls is induced by E-field from the horizontal current on the patch. So the 3dB beam-width of the antenna is broadened by the vertical current and horizontal current.
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Why is it important?
The method to broaden the beam-width is used for many types of antennas.
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This page is a summary of: Broadening the beam-width of microstrip antenna by the induced vertical currents, IET Microwaves Antennas & Propagation, February 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-map.2017.0295.
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