Wireless communication module
First and second end-fire antennas are arranged on a dielectric substrate. The first end-fire antenna has polarization characteristics being parallel with a first direction. The second end-fire antenna has polarization characteristics being parallel with a second direction orthogonal to the first direction. A patch antenna provided with a first feed point and a second feed point, which are different from each other, is arranged on the dielectric substrate. When the patch antenna is fed from the first feed point, a radio wave whose polarization direction is parallel with the first direction is excited. When the patch antenna is fed from the second feed point, a radio wave whose polarization direction is orthogonal to the first direction is excited. A wireless communication module capable of achieving directivity in a wide range from a direction parallel with the substrate to the direction of the normal to the substrate is provided.
1. A wireless communication module comprising:
a dielectric substrate;
at least one first end-fire antenna arranged on the dielectric substrate, having directivity in a direction parallel with a surface of the dielectric substrate, and having polarization characteristics being parallel with a first direction;
at least one second end-fire antenna arranged on the dielectric substrate, having directivity in the direction parallel with the surface of the dielectric substrate, and having polarization characteristics being parallel with a second direction orthogonal to the first direction; and
at least one patch antenna arranged on the dielectric substrate and provided with a first feed point and a second feed point, the first and second feed points being different from each other,
wherein when the patch antenna is fed from the first feed point, a radio wave having a polarization direction parallel with the first direction is excited, and when the patch antenna is fed from the second feed point, a radio wave having a polarization direction orthogonal to the first direction is excited.
2. The wireless communication module according to claim 1 , wherein when the patch antenna is fed from the second feed point, a radio wave having a polarization direction parallel with the second direction is radiated.
3. The wireless communication module according to claim 2 , wherein the at least one patch antenna comprises a plurality of patch antennas having an array antenna structure aligned in a matrix in the first direction and the second direction.
4. The wireless communication module according to claim 3 , wherein a number of the patch antennas aligned in the first direction is larger than a number of the patch antennas aligned in the second direction, each of some of the patch antennas is configured to be fed from the first feed point and the second feed point, and each of remaining ones of the patch antennas is configured to be fed from only the second feed point.
5. The wireless communication module according to claim 3 , wherein the at least one first end-fire antenna comprises a plurality of first end-fire antennas having an array antenna structure aligned in the first direction, and
the at least one second end-fire antenna comprises a plurality of second end-fire antennas having an array antenna structure aligned in the second direction.
6. The wireless communication module according to claim 5 , wherein high-frequency signals having phases adjusted independently of each other through phase shifters are supplied to the first end-fire antennas, and
high-frequency signals having a same phase as supplied to the first end-fire antennas are supplied to the second end-fire antennas.
7. eless communication module according to claim 3 , wherein a number of the patch antennas aligned in the first direction is larger than a number of the patch antennas aligned in the second direction, and
the wireless communication module further comprises an electromagnetic lens configured to converge radio waves radiated by the second end-fire antenna.
8. The wireless communication module according to claim 1 , wherein one of the first direction and the second direction is parallel with the surface of the dielectric substrate, and another direction is parallel with a thickness direction of the dielectric substrate.
9. The wireless communication module according to claim 4 , wherein the at least one first end-fire antenna comprises a plurality of first end-fire antennas having an array antenna structure aligned in the first direction, and
the at least one second end-fire antenna comprises a plurality of second end-fire antennas having an array antenna structure aligned in the second direction.