Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements
Publication: Research - peer-review › Journal article – Annual report year: 2012
The theory as well as numerical and experimental results are presented for a superdirective array composed of closely spaced electrically small resonant magnetic dipole elements. The array operates on a metal ground plane and can exhibit a maximum directivity of 11.5 dBi, 15.2 dBi, and 17.8 dBi (including 3 dB due to the ground plane), for 2, 3, and 4 magnetic dipoles, respectively. The array is self-resonant and is directly excited by a 50-ohm coaxial cable through the ground plane. The array radiates essentially the $\vert\mu\vert=1$ spherical modes, which, despite a narrow bandwidth, makes it an excellent first-order probe for spherical near-field antenna measurements at low frequencies.
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- Electrically small antennas, First-order probe, Magnetic dipole, Spherical near-field antenna measurements, Superdirectivity, Supergain array
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