Patent ID: 9083310
Filing Date: 2015-07-14
Classification: H03H

Abstract:
1. A laminated structural type balun comprising: a low pass filter that is provided between an unbalanced terminal inputting and outputting unbalanced signals and a first balanced terminal inputting and outputting balanced signals and includes a first coil and a first capacitor; a high pass filter that is provided between the unbalanced terminal and a second balanced terminal inputting and outputting balanced signals and includes a second capacitor and a second coil; and a laminated body that includes a plurality of layers including a plurality of conductor layers having a conductor pattern and a plurality of insulating layers being laminated on a surface of a substrate and includes the low pass filter and the high pass filter, wherein the laminated body includes a first conductor layer, a dielectric layer formed on a surface of the first conductor layer, a first insulating layer formed on a surface of the dielectric layer and a second conductor layer formed on a surface of the first insulating layer, each of the first capacitor and the second capacitor has a first electrode pattern formed in the first conductor layer and a second electrode pattern formed in the second conductor layer and facing the first electrode pattern, the second electrode pattern includes an embedded electrode pattern penetrating through the first insulating layer into the dielectric layer, the dielectric layer is interposed between the first electrode pattern and the embedded electrode pattern to electrically isolate them from each other, and the first capacitor and the second capacitor are arranged in a different area from the first coil and the second coil when viewed from a laminated direction of the laminated body.