TY - JOUR
T1 - Compact Uniform Circular Quarter-Wavelength Monopole Antenna Arrays with Wideband Decoupling and Matching Networks
AU - Kornprobst, Jonas
AU - Mittermaier, Thomas J.
AU - Mauermayer, Raimund A.M.
AU - Hamberger, Gerhard F.
AU - Ehrnsperger, Matthias G.
AU - Lehmeyer, Bernhard
AU - Ivrlac, Michel T.
AU - Imberg, Ulrik
AU - Eibert, Thomas F.
AU - Nossek, Josef A.
N1 - Publisher Copyright:
© 1963-2012 IEEE.
PY - 2021/2
Y1 - 2021/2
N2 - 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 ground plane. 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-element 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, whereas 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.
AB - 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 ground plane. 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-element 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, whereas 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.
KW - 5G
KW - antenna arrays
KW - beamforming
KW - decoupling and matching network (DMN)
KW - quarter-wavelength monopole
UR - http://www.scopus.com/inward/record.url?scp=85100607451&partnerID=8YFLogxK
U2 - 10.1109/TAP.2020.3016422
DO - 10.1109/TAP.2020.3016422
M3 - Article
AN - SCOPUS:85100607451
SN - 0018-926X
VL - 69
SP - 769
EP - 783
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 2
M1 - 9171461
ER -