US 7,256,663 B2 · Balun device, balance filter device, and wireless communication apparatus

Abstract

A balun device, a balance filter device, and a wireless communication apparatus are provided. An intermediate electrode is disposed between a balanced resonance electrode and a GND electrode. More specifically, the balun device includes a pair of GND electrodes formed on a dielectric layer, an unbalanced resonance electrode formed on a dielectric layer, and a balanced resonance electrode formed on a dielectric layer. The unbalanced resonance electrode and the balanced resonance electrode are disposed between the pair of GND electrodes by laminating the corresponding dielectric layers. The intermediate electrode is interposed between the balanced resonance electrode and the GND electrode positioned close to the balanced resonance electrode.

Claims20

Dependent claims

A balance filter device comprising:

a filter unit formed by laminating a plurality of dielectric substrates;
and
a balun device comprising:
a pair of ground (GND) electrodes formed on respective dielectric layers;
an unbalanced resonance electrode formed on a dielectric layer;
a balanced resonance electrode formed on a dielectric layer, the unbalanced resonance electrode and the balanced resonance electrode being disposed between the pair of ground (GND) electrodes by laminating the dielectric layers;
and
an intermediate electrode disposed between one of the unbalanced resonance electrode or the balanced electrode and the ground (GND) electrode near the one of the unbalanced resonance electrode or the balanced electrode wherein the intermediate electrode is formed larger than the ground (GND) electrode,
the filter unit being connected to the unbalanced resonance electrode of the balun unit, wherein the filter unit and the balun unit are formed of the same dielectric material.

6 more elements

A balun device comprising:

a pair of ground (GND) electrodes formed on respective dielectric layers;
an unbalanced resonance electrode formed on a dielectric layer;
a balanced resonance electrode formed on a dielectric layer, the unbalanced resonance electrode and the balanced resonance electrode being disposed between the pair of ground (GND) electrodes by laminating the dielectric layers;
and
an intermediate electrode disposed between one of the unbalanced resonance electrode or the balanced electrode and the ground (GND) electrode near the one of the unbalanced resonance electrode or the balanced electrode wherein the intermediate electrode is formed larger than the ground (GND) electrode,
wherein the pair of ground (GND) electrodes and the unbalanced resonance electrode overlap each other in the laminating direction,
the pair of ground (GND) electrodes and the balanced resonance electrode overlap each other in the laminating direction,
the intermediate electrode and the unbalanced resonance electrode overlap each other in the laminating direction, and
the intermediate electrode and the balanced resonance electrode overlap each other in the laminating direction.

6 more elements

Dependencies are inferred from the claim text.

Balun device, balance filter device, and wireless communication apparatus

Life of this patent

Balun device, balance filter device, and wireless communication apparatus

Life of this patent

Abstract

Claims20