Compact Uniform Circular Quarter-Wavelength Monopole Antenna Arrays with Wideband Decoupling and Matching Networks
| Autor: | Raimund A. M. Mauermayer, Michel T. Ivrlac, Matthias G. Ehrnsperger, Thomas J. Mittermaier, Bernhard Lehmeyer, Gerhard F. Hamberger, Josef A. Nossek, Ulrik Imberg, Jonas Kornprobst, Thomas F. Eibert |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Beamforming
Signal Processing (eess.SP) Computer science FOS: Physical sciences 020206 networking & telecommunications Electrical element 02 engineering and technology Applied Physics (physics.app-ph) Physics - Applied Physics Topology Microstrip 0202 electrical engineering electronic engineering information engineering Bandwidth (computing) Scattering parameters FOS: Electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Wideband Electrical Engineering and Systems Science - Signal Processing Monopole antenna Decoupling (electronics) |
| Popis: | Two novel decoupling and matching networks (DMNs) in microstrip technology for three-element uniform circular arrays (UCAs) are investigated and compared to a more conventional DMN approach with simple neutralization lines. The array elements are coaxially-fed quarter-wavelength monopole antennas over a finite groundplane. Three-element arrays are considered since UCAs with an odd number of elements are able to provide an almost constant maximum array factor over the whole azimuthal angular range. The new designs are explained from a theoretical point of view and their implementations are compared to four- and three-elements UCAs without DMN in terms of decoupling and matching bandwidth as well as beamforming capabilities. In addition to excellent decoupling and matching below -16 dB, a broader bandwidth is obtained by the two DMNs. The reasons for the enhanced bandwidth are similar in both cases: By introducing several circuit elements offering additional degrees of freedom, matching of the monopole input impedances at different frequencies becomes feasible. One of the presented designs offers a larger bandwidth, while the other design is able to provide a better total efficiency. Scattering parameters, radiation patterns, beamforming capabilities, and enhanced gain are all verified by measurements over the operating bandwidth. 15 pages, 28 figures, 1 table, published in IEEE Transactions on Antennas and Propagation |
| Databáze: | OpenAIRE |
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