Antenna module and communication device equipped with the same
An antenna module includes a ground electrode, a fed element, unfed elements, and feed lines. The unfed element is formed in a planar shape and disposed facing the ground electrode. The fed element is formed in a planar shape and disposed between the unfed element and the ground electrode. The unfed element is formed in a planar shape and disposed between the fed element and the ground electrode. The feed lines extend through the unfed element and are used to transfer radio-frequency signals to the fed element.
1. An antenna module comprising:
a first ground electrode;
a planar-shaped first unfed element disposed facing the first ground electrode;
a planar-shaped fed element disposed between the first unfed element and the first ground electrode;
a planar-shaped second unfed element disposed between the fed element and the first ground electrode;
a first feed line extending through the second unfed element and configured to transfer a radio-frequency signal to the fed element; and
a second feed line that extends through the second unfed element and is configured to transfer the radio-frequency signal to the fed element, wherein
the first unfed element is formed in a cruciform shape when viewed in a plan view in a normal direction.
2. The antenna module of claim 1 , wherein
the first unfed element extends outwards beyond the fed element when viewed in a plan view in the normal direction.
3. The antenna module of claim 1 , wherein
the fed element is configured to emit a radio wave in a first polarization direction in accordance with the radio-frequency signal from the first feed line and emit a radio wave in a second polarization direction perpendicular to the first polarization direction in accordance with the radio-frequency signal from the second feed line.
4. The antenna module of claim 3 , wherein
the first unfed element extends in the first polarization direction and the second polarization direction when viewed in a plan view in the normal direction.
5. The antenna module of claim 1 , wherein
the second feed line includes a first via and a second via.
6. The antenna module of claim 5 , wherein
when the antenna module is viewed in a plan view in the normal direction, the first via is different in position from the second via.
7. The antenna module of claim 6 , wherein
the first via extends from a first ground electrode side to the second unfed element, and
the second via extends from the second unfed element to the fed element.
8. The antenna module of claim 1 , wherein
the first feed line includes a first via and a second via.
9. The antenna module of claim 1 , wherein
when the second unfed element is viewed in a plan view in a normal direction, the second unfed element is larger in size than the fed element.
10. The antenna element of claim 9 , wherein
the fed element is configured to emit a radio wave in a first frequency band, and
the second unfed element is configured to emit a radio wave in a second frequency band lower than the first frequency band.
11. The antenna module of claim 1 , wherein
the first feed line includes a wiring pattern extending at a same planar layer as the first ground electrode.
12. The antenna module of claim 1 , further comprising:
a feed circuit configured to supply the radio-frequency signal to the fed element.
13. An antenna module comprising:
a first ground electrode;
a planar-shaped first unfed element disposed facing the first ground electrode;
a planar-shaped fed element disposed between the first unfed element and the first ground electrode;
a planar-shaped second unfed element disposed between the fed element and the first ground electrode; and
a first feed line extending through the second unfed element and configured to transfer a radio-frequency signal to the fed element, wherein
the first unfed element is formed in a cruciform shape when viewed in a plan view in a normal direction,
the first feed line includes a first via and a second via, and
when the antenna module is viewed in a plan view in a normal direction, the first via is different in position from the second via.
14. The antenna module of claim 13 , wherein
the first via extends from a first ground electrode side to the second unfed element, and
the second fourth via extends from the second unfed element to the fed element.
15. An antenna module comprising:
a first ground electrode;
a planar-shaped first unfed element disposed facing the first ground electrode;
a planar-shaped fed element disposed between the first unfed element and the first ground electrode;
a planar-shaped second unfed element disposed between the fed element and the first ground electrode;
a second ground electrode disposed between the second unfed element and the first ground electrode; and
a first feed line extending through the second unfed element and configured to transfer a radio-frequency signal to the fed element, wherein
the first unfed element is formed in a cruciform shape when viewed in a plan view in a normal direction, and
the first feed line includes a wiring pattern extending at a layer between the first ground electrode and the second ground electrode.