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Phase-Equalized Periodic Series-Feeding Network from Structural Asymmetry

: Al-Bassam, A.; Heberling, D.; Caloz, C.

13th European Conference on Antennas and Propagation, EuCAP 2019
Piscataway, NJ: IEEE, 2019
ISBN: 978-88-907018-8-7
ISBN: 978-1-5386-8127-5
Art. 18759818, 5 S.
European Conference on Antennas and Propagation (EUCAP) <13, 2019, Krakow>
Fraunhofer FHR ()

All open 1D-periodic structures with symmetric unit cell exhibit abrupt variation in their physical parameters at the equi-phase frequency (Γ point of reciprocal space), which usually results in undesirable radiation characteristics. This is the case for leaky-wave antennas (LWAs), but also for Series Feeding Networks (SFNs), where radiation could be considered as energy propagation into the feeding ports. We show here that the response of a periodic SFN can be equalized versus frequency through the equi-phase frequency, just as that of LWAs, by the introduction a proper amount of asymmetry in its unit cell. Moreover, we illustrate this fact with the example of a millimeter-wave (77 GHz) array of antipodal Vivaldi antennas feed by such an asymmetric SFN.