Antenna and wireless device having same
View Patent ↗An antenna includes an antenna element to transmit or receive electromagnetic signals, and a ground conductor to be grounded. The antenna element includes two conductors arranged substantially parallel to each other, a power feed portion provided between one conductor of the two conductors and the ground conductor, and connected to a feed system, a shorting portion for electrically connecting an other conductor of the two conductors and the ground conductor, and a conductor connecting portion for electrically connecting the two conductors together. The distance between the two conductors is not more than 1/100 a wavelength equivalent to a minimum frequency of operating frequencies of the antenna.
1. An antenna, comprising:
an antenna element to transmit or receive electromagnetic signals; and
a ground conductor,
wherein the antenna element comprises two conductors arranged substantially parallel to each other, a power feed portion provided between one conductor of the two conductors and the ground conductor, and connected to a feed system, a shorting portion for electrically connecting an other conductor of the two conductors and the ground conductor, and a conductor connecting portion for electrically connecting the two conductors together,
wherein a distance between the two conductors is not more than 1/100 a wavelength equivalent to a minimum frequency of operating frequencies of the antenna, and
wherein the other conductor comprises a conductor pattern formed on a surface of a printed board.
2. The antenna according to claim 1 , wherein the one conductor comprises a conductor pattern formed on another surface of the printed board,
and
wherein the conductor connecting portion comprises a conductor formed in an inner portion of a through hole formed in the printed board.
3. The antenna according to claim 2 , wherein the two conductors have widths different from each other.
4. The antenna according to claim 2 , wherein the two conductors are parallel with each other.
5. The antenna according to claim 1 , wherein each of the two conductors comprises a conductor plate, and
wherein the conductor connecting portion comprises a linear conductor for electrically connecting the conductor plates together.
6. The antenna according to claim 1 , further comprising:
a second conductor for serving as a second antenna element which is connected in parallel to the power feed portion.
7. The antenna according to claim 1 , further comprising:
a plurality of the antenna elements, which share the power feed portion, and which differ in dimensions or shape of the two conductors.
8. The antenna according to claim 1 , further comprising:
a coaxial cable for feeding the power feed portion.
9. The antenna according to claim 1 , wherein in a frequency band smaller than two times a series resonant frequency that is a lowest frequency, the antenna has another series resonant frequency.
10. The antenna according to claim 1 , wherein the two conductors have widths different from each other.
11. The antenna according to claim 1 , wherein the feed system comprises a power supply.
12. A wireless device for transmitting information using electromagnetic signals, the wireless device comprising:
an antenna comprising an antenna element to transmit or receive electromagnetic signals; and
a ground conductor to be grounded,
wherein the antenna element comprises two conductors arranged substantially parallel to each other, a power feed portion provided between one conductor of the two conductors and the ground conductor, and connected to a feed system, a shorting portion for electrically connecting an other conductor of the two conductors and the ground conductor, and a conductor connecting portion for electrically connecting the two conductors together,
wherein a distance between the two conductors is not more than 1/100 a wavelength equivalent to a minimum frequency of operating frequencies of the antenna, and
wherein the other conductor comprises a conductor pattern formed on a surface of a printed board.
13. The wireless device according to claim 12 , wherein the one conductor comprises a conductor pattern formed on another surface of the printed board,
and
wherein the conductor connecting portion comprises a conductor formed in an inner portion of a through hole formed in the printed board.
14. The wireless device according to claim 12 , wherein each of the two conductors comprises a conductor plate, and
wherein the conductor connecting portion comprises a linear conductor for electrically connecting the conductor plates together.
15. The wireless device according to claim 12 , further comprising:
a second conductor for serving as a second antenna element which is connected in parallel to the power feed portion.
16. The wireless device according to claim 12 , further comprising:
a plurality of the antenna elements, which share the power feed portion, and which differ in dimensions or shape of the two conductors.
17. The wireless device according to claim 12 , further comprising:
a coaxial cable for feeding the power feed portion.
18. The wireless device according to claim 12 , wherein the two conductors have widths different from each other.
19. The wireless device according to claim 12 , wherein in a frequency band smaller than two times a series resonant frequency that is a lowest frequency, the antenna has another series resonant frequency.
20. The wireless device according to claim 12 , wherein the feed system comprises a power supply.