Dual and triple band patch antennas fed by meandering probe

Patch antennas fed by meandering or M-probes have the advantage of low cross polarization, compared to the case of feeding by L-probes. In this paper, the general method of using U-slots to design dual/triple band patch antennas is applied to M-probe fed patch antennas. Several of these antennas have been fabricated and measured. Simulation results using Zeland IE3D software agree well with measured results. It is found that, in order to preserve the low cross polarization characteristics, a pair of face-to-face U-slots are needed for the dual band case while two pairs of such U-slots are required for the triple band cases.