A High-Efficiency Compact Planar Antenna For Ism Wireless Systems

A novel high-efficiency compact planar antenna at 433MHz with minimized size and low-cost and easy to integrate into the ISM wireless applications is designed, fabricated, and measured. Capacitive strips that are formed by cutting inter-digital slots and the meander lines on both sides are introduced to greatly reduce the antenna size yet maintain the high efficiency. Theproposed antenna has a simple planar structure and occupies a small area (i e., 45 x 30mm(2)). This novel electrically small antenna can be operated well without any lumped elements for impedance matching. Details of the antenna design and experimental results are presented and discussed.