Filtronic Lk Oy

Sauli Kivel&auml;

Jyrki Mikkola

Suvi Tarvas

Anne Isoh&auml;t&auml;l&auml;

Kimmo Antila

A planar antenna comprises a planar radiating element ( ) formed of a conductive area confined by a substantially continuous border line. The conductive area is split by a gap which divides the planar radiating element into a first branch and second branch such that both the first and the second branch have an outermost end. The gap has a head end on said substantially continuous border line and a tail end within the conductive area. At its head end ( ) the gap has a certain first direction and at another point ( ) a certain second direction which differs from the first direction by more than 90 degrees when the directions are defined along the gap from the head end towards the tail end. The outermost end of the second branch, confined by the gap, is located within the continuous border line, surrounded by the first branch.

Planar antenna with two resonating frequencies

A PIFA structure has a first operating frequency and a second operating frequency. It comprises a planar radiating element (,) which is a conductive area confined by a substantially continuous border line divided by a non-conductive slot (,). The slot has a first end on said substantially continuous border line and a second end within the conductive area. The planar radiating element comprises a feedpoint (,) and ground contact (,) near the first end of the slot so that the electrical length of the conductive area divided by the slot, measured at the feedpoint, equals a quarter of the wavelength at the first operating frequency and the electrical length of the slot equals a quarter of the wavelength at the second operating frequency.

Growing community of inventors

Kuusamo, Finland

Sauli Kivelä

Growing community of inventors

Kuusamo, Finland

Sauli Kivel&auml;

Sauli Kivelä