Conference paper
Extending the Bandwidth of a Superdirective First-Order Probe for Spherical Near-Field Antenna Measurements
A superdirective array of electrically small dipole radiators can effectively be used as a compact and lightweight first-order probe (a directive antenna radiating predominantly spherical modes with the azimuthal index |µ| = 1) in spherical near-field antenna measurements at low frequencies. This contribution shows that a very narrow frequency bandwidth peculiar to superdirective antennas can be extended to practical values by the proper design of the array elements as well as by relaxing the maximum directivity condition, while keeping |µ| = 1 modes dominating in the radiation spectrum of the antenna.
The resulting probe has the relative bandwidth of 3% and directivity above 9 dBi; its height is 0.5λ over a 1λ circular ground plane.
| Language: | English |
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| Publisher: | Institute of Electronics, Information and Communication Engineers |
| Year: | 2015 |
| Pages: | 603-605 |
| Proceedings: | International Symposium on Antennas and Propagation |
| ISBN: | 147995361X , 147995361x , 4885523028 , 4885523036 , 9781479953615 , 9784885523021 and 9784885523038 |
| Types: | Conference paper |
| ORCIDs: | Kim, Oleksiy S. |
Antenna arrays Antenna measurements Bandwidth Dipole antennas Directive antennas Frequency measurement Probes antenna radiation patterns antenna radiation spectrum circular ground plane dipole antenna arrays directive antennas electrically small dipole radiator superdirective array spherical near-field antenna measurements superdirective first-order probe bandwidth
