Nokia Corporation

Aito Bv

Vesa Korhonen

Olli Salmela

Turo Keski-Jaskari

Markku Koivisto

Jockum Lönnberg

Esa Kemppinen

Kalle Jokio

Ali Nadir Arslan

Mikko Saarikoski

Teppo Miettinen

Jockum LÖNNBERG

A piezoelectric device comprises at least one element comprising at least one sheet of piezoelectric material. The element is mounted on a circuit board comprising at least one conductive layer having at least one opening. The element is located on the opening and supported by edges of the opening in such a manner that the opening extends laterally beyond the area of the sheet of piezoelectric material. The element is sandwiched between an overlay and the circuit board in such a manner that vibrations of the sheet of piezoelectric material are sufficient to cause vibration of the overlay.

Piezoelectric device and an apparatus

The invention relates to a device for guiding electromagnetic waves from a wave guide (), in particular a multi-band wave guide, to a transmission line (), in particular a micro strip line, arranged at one end of the wave guide (), comprising coupling means (--) for mechanical fixation and impedance matching between the wave guide () and the transmission line (). It is the object of the invention to improve such a structure in the way that manufacturing is made easier and less expensive than according to prior art. According to the present invention that object is solved in the way that the coupling means comprises at least one dielectric layer () being mechanically connected with the main plane of the transmission line, the geometric dimension of that at least one dielectric layer extending along the propagation direction of the electromagnetic waves being correlated with the center frequency of electromagnetic waves in order to achieve optimised impedance matching.

Waveguide to stripline transition with via forming an impedance matching fence

Growing community of inventors

Helsinki, Finland

Vesa Korhonen