Abstract
Guidelines for designing compact and lightweight first-order probes for spherical near-field antenna measurements at frequencies below 1 GHz that exploit first-order properties of electrically small self-resonant radiators combined into superdirective endfire arrays are established theoretically, exemplified numerically, and validated experimentally. A prototype of the probe designed to operate at a central frequency of 435 MHz exhibits the impedance bandwidth of 15 MHz with a directivity of more than 9 dBi and parasitic $|\mu |\ne 1$ spherical modes suppressed to at least −42 dB. The probe height is just 343 mm above a 720-mm circular ground plane and weighs about 5 kg.
| Original language | English |
|---|---|
| Journal | I E E E Transactions on Antennas and Propagation |
| Volume | 65 |
| Issue number | 7 |
| Pages (from-to) | 3684 - 3690 |
| ISSN | 0018-926X |
| DOIs | |
| Publication status | Published - 2017 |
Bibliographical note
(c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.Keywords
- Probes
- Bandwidth
- Antenna measurements
- Antenna arrays
- Frequency measurement
- Dipole antennas
- Electrically small antennas
- Frequency bandwidth
- Linear arrays
- Physical bounds
- Quality factor
- Radiation
- Spherical near-field (SNF)
- Supergain antennas