Design of compact multiresonator-loaded planar antenna with quad-band working properties for wireless communication

In this study, a novel design of a compact multiresonator-loaded planar antenna with quad-band working properties is proposed for wireless communication. Multiresonator-loaded structures are employed, which include a pair of symmetrical edge resonators embedded into the edges of the monopole, a T-shaped stub resonator extended from the ground and an inverted Ushaped narrow slot resonator etched on the T-shaped stub. By loading these resonators, a modified U-shaped monopole antenna can easily produce four separate working bands while achieving a very compact size of 18 ¿¿ 20 mm². Based on this concept, a prototype of quad-band antenna is designed, fabricated and tested. The measured results demonstrate that the proposed antenna is capable of operating over the frequency ranges, 2.39-2.49, 3.37-4.06, 4.73-5.46 and 5.69-6.31 GHz, suitable for wireless local area network 2.4/5.2/5.8 GHz and worldwide interoperability for microwave access 3.5 GHz applications.