Radio-frequency module and communication device
Improvement in heat dissipation capability is intended. A radio-frequency module includes a mounting substrate, a plurality of transmission filters, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The plurality of transmission filters is mounted on the first major surface of the mounting substrate. The resin layer is disposed on the first major surface of the mounting substrate and covers at least part of an outer peripheral surface of each of the plurality of transmission filters. The shield layer covers the resin layer and at least part of each of the plurality of transmission filters. At least part of a major surface of each of the plurality of transmission filters on an opposite side to the mounting substrate side is in contact with the shield layer.
1 . A radio-frequency module comprising:
a mounting substrate having a first major surface and a second major surface opposite to each other;
a plurality of transmission filters mounted on the first major surface of the mounting substrate;
a resin layer disposed on the first major surface of the mounting substrate and covering at least part of an outer peripheral surface of each of the plurality of transmission filters; and
a shield layer covering the resin layer and at least part of each of the plurality of transmission filters, wherein
at least part of a major surface of each of at least two transmission filters of the plurality of transmission filters on an opposite side to the mounting substrate side is in contact with the shield layer.
2 . A radio-frequency module comprising:
a mounting substrate having a first major surface and a second major surface opposite to each other;
a plurality of transmission filters mounted on the first major surface of the mounting substrate;
a plurality of metal members disposed on a major surface of each of the transmission filters on an opposite side to the mounting substrate side;
a resin layer disposed on the first major surface of the mounting substrate and covering at least part of an outer peripheral surface of each of the plurality of transmission filters and at least part of an outer peripheral surface of each of the plurality of metal members; and
a shield layer covering the resin layer and at least part of each of the plurality of metal members, wherein
the plurality of metal members is in contact with the shield layer and major surfaces of corresponding ones of the plurality of transmission filters on an opposite side to the mounting substrate side.
3 . The radio-frequency module according to claim 1 , wherein
the major surface of each of the plurality of transmission filters has a grinding mark.
4 . The radio-frequency module according to claim 3 , wherein
each of the plurality of transmission filters has a substrate, and
each of the plurality of substrates is a silicon substrate, or each of the plurality of substrates is a lithium tantalate substrate, or each of the plurality of substrates is a lithium niobate substrate.
5 . The radio-frequency module according to claim 1 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate; and
an input matching circuit connected to an input terminal of the low-noise amplifier, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the input matching circuit.
6 . The radio-frequency module according to claim 1 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate;
an antenna terminal disposed on the mounting substrate;
a first switch mounted on the mounting substrate, the first switch having a common terminal connected to the antenna terminal and a plurality of selection terminals connectable to the common terminal; and
a plurality of matching circuits provided in a one-to-one correspondence with the plurality of transmission filters and connected between the plurality of transmission filters and the plurality of selection terminals of the first switch, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the plurality of matching circuits.
7 . The radio-frequency module according to claim 6 , wherein
the output matching circuit includes an inductor adjacent to at least one transmission filter of the plurality of transmission filters in plan view in the thickness direction of the mounting substrate,
a substrate of each of the plurality of transmission filters is a silicon substrate, and
a winding axis of the inductor is set along the thickness direction of the mounting substrate.
8 . The radio-frequency module according to claim 6 , further comprising
a first IC chip including the low-noise amplifier and the first switch, wherein
the first IC chip is mounted on the second major surface of the mounting substrate, and
in plan view in the thickness direction of the mounting substrate, the first IC chip does not overlap the plurality of transmission filters.
9 . The radio-frequency module according to claim 8 , further comprising
a second IC chip different from the first IC chip, wherein
the second IC chip includes
a second switch different from the first switch, and
a controller configured to control the power amplifier,
the second IC chip is mounted on the second major surface of the mounting substrate, and
in plan view in the thickness direction of the mounting substrate, at least one of the plurality of transmission filters overlaps the second IC chip.
10 . The radio-frequency module according to claim 5 , wherein
the power amplifier is mounted on the first major surface of the mounting substrate, and
a major surface of the power amplifier on an opposite side to the mounting substrate side is in contact with the shield layer.
11 . The radio-frequency module according to claim 1 , further comprising:
a receiving circuit including a receiving filter mounted on the first major surface of the mounting substrate; and
a shield member disposed on the first major surface of the mounting substrate and, in plan view in a thickness direction of the mounting substrate, disposed between the receiving circuit and the plurality of transmission filters, wherein
the shield layer covers the shield member, and
the shield member is in contact with the shield layer.
12 . A communication device comprising:
the radio-frequency module according to claim 1 ; and
a signal processing circuit connected to the radio-frequency module.
13 . The radio-frequency module according to claim 2 , wherein
the major surface of each of the plurality of transmission filters has a grinding mark.
14 . The radio-frequency module according to claim 2 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate; and
an input matching circuit connected to an input terminal of the low-noise amplifier, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the input matching circuit.
15 . The radio-frequency module according to claim 3 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate; and
an input matching circuit connected to an input terminal of the low-noise amplifier, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the input matching circuit.
16 . The radio-frequency module according to claim 4 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate; and
an input matching circuit connected to an input terminal of the low-noise amplifier, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the input matching circuit.
17 . The radio-frequency module according to claim 2 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate;
an antenna terminal disposed on the mounting substrate;
a first switch mounted on the mounting substrate, the first switch having a common terminal connected to the antenna terminal and a plurality of selection terminals connectable to the common terminal; and
a plurality of matching circuits provided in a one-to-one correspondence with the plurality of transmission filters and connected between the plurality of transmission filters and the plurality of selection terminals of the first switch, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the plurality of matching circuits.
18 . The radio-frequency module according to claim 3 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate;
an antenna terminal disposed on the mounting substrate;
a first switch mounted on the mounting substrate, the first switch having a common terminal connected to the antenna terminal and a plurality of selection terminals connectable to the common terminal; and
a plurality of matching circuits provided in a one-to-one correspondence with the plurality of transmission filters and connected between the plurality of transmission filters and the plurality of selection terminals of the first switch, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the plurality of matching circuits.
19 . The radio-frequency module according to claim 4 , further comprising:
a power amplifier mounted on the mounting substrate;
an output matching circuit connected to an output terminal of the power amplifier;
a low-noise amplifier mounted on the mounting substrate;
an antenna terminal disposed on the mounting substrate;
a first switch mounted on the mounting substrate, the first switch having a common terminal connected to the antenna terminal and a plurality of selection terminals connectable to the common terminal; and
a plurality of matching circuits provided in a one-to-one correspondence with the plurality of transmission filters and connected between the plurality of transmission filters and the plurality of selection terminals of the first switch, wherein
in plan view in a thickness direction of the mounting substrate, the plurality of transmission filters is located between the output matching circuit and the plurality of matching circuits.
20 . The radio-frequency module according to claim 7 , further comprising
a first IC chip including the low-noise amplifier and the first switch, wherein
the first IC chip is mounted on the second major surface of the mounting substrate, and
in plan view in the thickness direction of the mounting substrate, the first IC chip does not overlap the plurality of transmission filters.