Antenna module and communication device equipped with the same
An antenna module includes substrates with different normal directions from each other, a radiating element disposed on the substrate, a radiating element disposed on the substrate, a hybrid coupler, and an RFIC. The hybrid coupler includes input terminals (IN 1 , IN 2 ), and output terminals (OUT 1 , OUT 2 ). The RFIC is connected to the input terminals (IN 1 , IN 2 ) and supplies a radio-frequency signal to the radiating elements. The radiating elements are capable of radiating a radio wave in a first frequency band. The radiating element is connected to the output terminal (OUT 1 ), and the radiating element is connected to the output terminal (OUT 2 ). A phase difference between radio-frequency signals to be supplied to the input terminals (IN 1 , IN 2 ) is adjusted to fall within a range of greater than −90° and less than 90°.
1 . An antenna module comprising:
a first substrate and a second substrate disposed adjacent to each other and having different normal directions;
a first radiating element disposed on the first substrate;
a second radiating element disposed on the second substrate;
a first hybrid coupler including a first input terminal and a second input terminal, and a first output terminal and a second output terminal; and
a feed circuit connected to the first input terminal and the second input terminal and configured to supply a radio-frequency signal to the first radiating element and the second radiating element, wherein
the first radiating element and the second radiating element are configured to be capable of radiating a radio wave in a first frequency band,
the first radiating element is connected to the first output terminal,
the second radiating element is connected to the second output terminal, and
a phase difference between radio-frequency signals to be supplied to the first input terminal and the second input terminal is adjusted to fall within a range of greater than −90° and less than 90°.
2 . The antenna module according to claim 1 , further comprising a conductive connection portion connecting the first substrate and the second substrate.
3 . The antenna module according to claim 1 , wherein main surfaces of the first substrate and the second substrate are disposed in separate planes.
4 . The antenna module according to claim 1 , wherein, under a condition a wavelength of radio waves radiated from the first radiating element and the second radiating element is λ and n is an integer not less than zero, a difference between a line length from the first output terminal to the first radiating element and a line length from the second output terminal to the second radiating element is nλ.
5 . The antenna module according to claim 1 , wherein the feed circuit includes phase adjustment circuit components configured to adjust respective phases of radio-frequency signals to be supplied to the first input terminal and the second input terminal.
6 . The antenna module according to claim 1 , further comprising a phase adjustment circuit disposed at least between the feed circuit and the first input terminal or between the feed circuit and the second input terminal.
7 . The antenna module according to claim 1 , wherein the antenna module is configured to accommodate a phase difference between radio-frequency signals to be supplied to the first input terminal and the second input terminal that are adjusted to −90° or 90°.
8 . The antenna module according to claim 1 , wherein each of the first radiating element and the second radiating element is configured to be capable of radiating a radio wave in two different polarization directions.
9 . The antenna module according to claim 1 , wherein a polarization direction of a radio wave radiated from the first radiating element and a polarization direction of a radio wave radiated from the second radiating element coincide with each other.
10 . The antenna module according to claim 1 , wherein the feed circuit and the first hybrid coupler are disposed on a same substrate selected between the first substrate and the second substrate.
11 . The antenna module according to claim 1 , further comprising:
a third radiating element disposed adjacent to the first radiating element on the first substrate;
a fourth radiating element disposed adjacent to the second radiating element on the second substrate; and
a second hybrid coupler including a third input terminal and a fourth input terminal, and a third output terminal and a fourth output terminal, wherein
the third radiating element and the fourth radiating element are configured to be capable of radiating a radio wave in the first frequency band,
the third radiating element is connected to the third output terminal,
the fourth radiating element is connected to the fourth output terminal,
the feed circuit is configured to be capable of supplying a radio-frequency signal to the third input terminal and the fourth input terminal, and
a phase difference between radio-frequency signals to be supplied to the third input terminal and the fourth input terminal is identical to a phase difference between radio-frequency signals to be supplied to the first input terminal and the second input terminal.
12 . The antenna module according to claim 11 , wherein the feed circuit is configured to be capable of adjusting a radiation direction of a radio wave by imparting a phase difference between radio-frequency signals to be supplied to the third radiating element and the fourth radiating element with respect to radio-frequency signals to be supplied to the first radiating element and the second radiating element.
13 . The antenna module according to claim 11 , wherein
on the first substrate, the first radiating element and the third radiating element are disposed so as to be arranged in a first direction,
on the second substrate, the second radiating element and the fourth radiating element are disposed so as to be arranged in the first direction,
the first radiating element and the second radiating element are disposed so as to be arranged in a second direction different from the first direction, and
the third radiating element and the fourth radiating element are disposed so as to be arranged in the second direction.
14 . The antenna module according to claim 13 , wherein the first direction and the second direction are orthogonal to each other.
15 . The antenna module according to claim 1 , further comprising:
a fifth radiating element disposed on the first substrate;
a sixth radiating element disposed on the second substrate; and
a third hybrid coupler including a fifth input terminal and a sixth input terminal, and a fifth output terminal and a sixth output terminal, wherein
the fifth radiating element and the sixth radiating element are configured to be capable of radiating a radio-frequency signal in a second frequency band different from the first frequency band,
the feed circuit is configured to be capable of supplying a radio-frequency signal to the fifth input terminal and the sixth input terminal,
the fifth radiating element is connected to the fifth output terminal,
the sixth radiating element is connected to the sixth output terminal, and
a phase difference between radio-frequency signals to be supplied to the fifth input terminal and the sixth input terminal is adjusted to fall within a range of greater than −90° and less than 90°.
16 . A communication device comprising:
a baseband integrated circuit that performs baseband processing on signals exchanged with an antenna module; and
the antenna module, the antenna module including
a first substrate and a second substrate disposed adjacent to each other and having different normal directions,
a first radiating element disposed on the first substrate,
a second radiating element disposed on the second substrate,
a first hybrid coupler including a first input terminal and a second input terminal, and a first output terminal and a second output terminal, and
a feed circuit connected to the first input terminal and the second input terminal and configured to supply a radio-frequency signal to the first radiating element and the second radiating element, wherein
the first radiating element and the second radiating element are configured to be capable of radiating a radio wave in a first frequency band,
the first radiating element is connected to the first output terminal,
the second radiating element is connected to the second output terminal, and
a phase difference between radio-frequency signals to be supplied to the first input terminal and the second input terminal is adjusted to fall within a range of greater than −90° and less than 90°.
17 . The communication device of claim 16 , wherein the antenna module further comprising a conductive connection portion connecting the first substrate and the second substrate.
18 . The communication device of claim 16 , wherein main surfaces of the first substrate and the second substrate are disposed in separate planes.
19 . The communication device of claim 16 , wherein, under a condition a wavelength of radio waves radiated from the first radiating element and the second radiating element is λ and n is an integer not less than zero, a difference between a line length from the first output terminal to the first radiating element and a line length from the second output terminal to the second radiating element is nλ.
20 . The communication device of claim 16 , wherein the feed circuit includes phase adjustment circuit components configured to adjust respective phases of radio-frequency signals to be supplied to the first input terminal and the second input terminal.