Omnidirectional Horizontally Polarized Antenna with Pattern Reconfigurability

A novel omnidirectional, horizontally polarized antenna with the pattern reconfigurability is presented for modern ceiling routers. Horizontally polarized omnidirectional radiation is achieved using a rotational dipole array. A reflector is placed below the dipole array to reduce back radiation. A reconfigurable parasitic structure is designed, allowing the antenna to switch omnidirectional beams with varied elevation angles. Additionally, a tunable matching network allows for impedance matching across different states. Measurements indicate the overlapped -10dB impedance bandwidth across different states is 100 MHz (2.53-2.63GHz). The high and low-elevation patterns yield gains of 5.7 dBi and 7.2 dBi, with variations less than 2.5 and 1.6 dBi in the θ section, respectively.