Circuit parameters maximizing phase dispersion of frequency dispersive phase shifter for multi-band base station antenna

摘要

Frequency dispersive phase shifter for a multi-band base station antenna, which is capable of increasing the communication capacity by deep tilt angle in the lower frequency bands, has been proposed. In this paper, in order to enlarge the amount of phase shift of the frequency dispersive phase shifter, we first derive the equivalent circuit of the unit cell of the phase shifter. A lossless symmetrical T equivalent circuit is used as the equivalent circuit. Then, the results designing the left-handed components of the equivalent circuit that can enlarge the amount of phase shift of the phase shifter while maintaining Bloch impedance around 50Ω are described.