Multi-layer dual-band microstrip antenna

Microstrip antennas have many advantages over the conventional antennas except their inherent narrow bandwidth. In many applications, only distinct frequency bands may be needed instead of a continuous operating frequency range. Dual-band microstrip antennas have been suggested to cover two narrow frequency bands while retaining their advantages as microstrip antennas. A new dual-band microstrip antenna is introduced. The advantage of the proposed antenna over other available dual-band microstrip antennas is its easy fabrication. The antenna consists of multiple layers and is planar without any structure perpendicular to the ground plane. Those vertical features are difficult to fabricate and are common in other dual-band microstrip antennas. The planar structure of the multi-layer microstrip antenna is attractive from a manufacturing point of view, especially for mass production using printed-circuit technology.<>