Circuit module including a splitter and a mounting substrate

摘要

In a circuit module, even if a transmission signal output from a transmission electrode of a mounting substrate to a transmission terminal of a splitter leaks into a ground electrode, the transmission signal that has leaked into the ground electrode flows into via conductors that are connected along an edge portion of the ground electrode close to the transmission electrode and connected to a ground line of a motherboard. Therefore, the transmission signal that has been output from the transmission electrode and leaked into the ground electrode is prevented from traveling along an edge portion of the ground electrode toward a reception electrode side. Thus, characteristics of isolation between the transmission electrode and the reception electrode provided on the mounting substrate on which the splitter is mounted are improved.

主权项

1. A circuit module comprising:
a splitter that includes a transmission filter and a reception filter with different pass bands from each other; and a mounting substrate on which the splitter is mounted; wherein the splitter includes a transmission terminal that allows input to the transmission filter, a reception terminal that allows output from the reception filter, and a ground terminal; the mounting substrate includes a transmission electrode that is connected to the transmission terminal, a reception electrode that is connected to the reception terminal, and a ground electrode that is arranged between the transmission electrode and the reception electrode when viewed in plan and is connected to the ground terminal; a plurality of via conductors are connected to the ground electrode along an edge portion of the ground electrode that is close to the transmission electrode when viewed in plan; and the mounting substrate includes a plurality of dielectric layers, and a layer of the plurality of dielectric layers at which the ground electrode is provided is different from a layer of the plurality of dielectric layers at which the transmission electrode, the reception electrode, and the common electrode are provided.