In view of the ever-growing demand for further expansion of personal wireless communication system, there is a gradual shift of the emphasis from the existing single ISM band operation to dual ISM band covering the frequency range of 2.4-2.5 /5.15 –5.35 GHz. This calls for the development of dual ISM band antennas for possible applications in wireless communication. There exists a continued interest and requirement for the compact dual ISM band PIFA for emerging applications of RF data wireless systems comprising Laptop and other hand held communication devices. This paper presents some of the design case studies of dual ISM band PIFA for wireless system applications. In particular, the case studies cover the design of single feed dual ISM band PIFAs with very narrow width of the order of 3 mm.
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