The following article describes two different antennas, which were designed for operation at 868 MHz close to the human body. A patch antenna on ceramic substrate with a high dielectric constant and a planar inverted F-antenna
We investigate the reduction of mutual coupling between the radiating elements of a compact antenna array using a periodic structure. The periodic structure is designed such that it exhibits an electromagnetic bandgap for in-plane transmission over a specified frequency band around the operational frequency of 2.40 GHz. The experimental setup consists of a two-element dipole antenna array. For a spatial separation of /6, significant improvement of the radiation efficiency was observed
This paper presents the relationship between Gaussian beam and reflector antennas and deals with the most important conical corrugated feed horn design parameters for reflector antennas. Furthermore, a compact, easily to manufacture and easily to frequency-scale conical corrugated horn with more than 40% relative bandwidth is proposed. The hybrid-mode (HE11) conical corrugated feed horn operating from 26.5 to 40GHz has been designed, fabricated and measured
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