Patent ID: 7777592

Claim:
An antenna sharing device, comprising: a common signal terminal pair which inputs and outputs a signal; a first terminal pair which transmits the signal with the common signal terminal pair; a second terminal pair which transmits the signal with the common signal terminal pair; a first filter which passes the signal with a predetermined frequency bandwidth including a first frequency and uses the common signal terminal pair and the first terminal pair as input and output terminals; a second filter which passes the signal with a predetermined frequency bandwidth including a second frequency and uses the common signal terminal pair and the second terminal pair as input and output terminals; a first inductor element connected between the common signal terminal pair; second inductor elements which are connected to the first filter and form a structure that resonated with the second frequency; and third inductor elements which are connected to the second filter and form a structure that resonated with the first frequency, wherein the second and third inductor elements have a plurality of inductor elements, respectively; an inductor element closest to the first terminal pair among the second inductor elements and an inductor element closest to the second terminal pair among the third inductor elements are arranged further away from the first inductor element than the other inductor elements included in the second and third inductor elements; the first to third inductor elements and the first and second filters are formed on the same substrate; the first inductor element and the inductor element formed closest to the first terminal pair among the second inductor elements are arranged opposite to each other by sandwiching the first filter; and the first inductor element and the inductor element formed closest to the second terminal pair among the third inductor elements are arranged opposite to each other by sandwiching the second filter.