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Compact dual feed multiband planar antenna with PIFA/IFA combination

Rapid progress of the cellular communication industry in the recent past has resulted in a need for cellular handset with multiband operation and multi system capability. With the recent advances in the cellular communication technology, there is also an enhanced emphasis for internal cellular antennas to utilize its inherent advantages. In the recent past, the multiband PIFA has been a research topic of great interest to mobile communication industry.

In a multiband PIFA, the choice of either a single feed or multiple feeds is mostly dependent on the system requirements. However from the antenna design consideration, the choice of the single feed or multiple feeds has its relative merits and demerits. In a single feed multiband PIFA, the realization of the requisite bandwidth at multiple resonant frequencies will be an involved task leading to many design complexities. On the contrary, the multiband PIFA with multiple feeds has the relative advantage of diminished design complexities since the design of individual radiating elements with separate feeds is relatively easier. However, such a design recourse has to encounter the problem of mutual coupling between the individual radiating elements of a multiband PIFA.

There is a great concern for multiband PIFA with multiple feed ports having its performance compromised due to mutual coupling and poor isolation of the various resonant bands. Hence in spite of the reduced design complexities, multi band PIFA with multiple feeds has not been a logical choice for practical applications mainly due to the problem of mutual coupling. In view of this, the techniques to reduce the mutual coupling between the individual radiating elements with separate feeds of a multiband PIFA are of significant importance for many system applications.

This paper presents a technique of minimization of mutual coupling between the radiating elements of a multiband PIFA/planar antenna. In majority of the past research publications on dual band PIFA, the emphasis is mostly confined to the optimization of a dual feed dual band PIFA for cellular applications only. This paper proposes a technique of improving the isolation between the radiating elements of a dual feed Tri band Planar antenna for the cellular and non-cellular applications.

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