Wide-band feeder circuit and antenna having the same
View Patent ↗It is possible to obtain a wide-band feeder circuit a lower conductive plate provided substantially in parallel to an upper conductive plate, a short-circuit portion provided in a concave manner at a central portion of the lower conductive plate, and a countersunk portion provided in a convex manner at a central portion of a short-circuit plate forming a bottom of the short-circuit portion. It is also possible to obtain an antenna including such a wide-band feeder circuit.
1. A wide-band feeder circuit comprising:
a lower conductive plate provided substantially in parallel to an upper conductive plate;
a coaxial central conductor; and
a guide portion, wherein
the lower conductive plate provides a short-circuit portion in a concave manner at a central portion thereof and a countersunk portion in a convex manner at a central portion of the short-circuit portion, and
the coaxial central conductor is protected at a center of the countersunk portion by the guide portion.
2. The wide-band feeder circuit as recited in claim 1 , wherein a sidewall of the short-circuit portion is inclined.
3. The wide-band feeder circuit as recited in claim 2 , wherein a sidewall of the countersunk portion is inclined.
4. The wide-band feeder circuit as recited in claim 3 , wherein each of the short-circuit portion and the countersunk portion has a circular shape, and centers of the short-circuit portion and the countersunk portion are aligned with the same straight line.
5. The wide-band feeder circuit as recited in claim 1 , wherein a reverse conical conductor is formed at a tip of the coaxial central conductor.
6. The wide-band feeder circuit as recited in claim 1 , wherein the wide-band feeder circuit comprises an antenna with a central frequency of 7.75 GHz, a lower limit frequency of 7.25 GHz, and an upper limit frequency of 7.95 GHz.
7. The wide-band feeder circuit as recited in claim 6 , wherein a bandwidth is 700 MHz and a fractional bandwidth is 9%.
8. The wide-band feeder circuit as recited in claim 1 , wherein the wide-band feeder circuit comprises an antenna with a central frequency of 7.75 GHz, a lower limit frequency of 7.15 GHz, and an upper limit frequency of 8.25 GHz.
9. The wide-band feeder circuit as recited in claim 6 , wherein a bandwidth is 1.1 GHz and a fractional bandwidth is 14.2%.
10. An antenna comprising:
an upper conductive plate; and
a wide-band feeder circuit including a lower conductive plate provided substantially in parallel to the upper conductive plate, a coaxial central conductor and a guide portion, wherein
the lower conductive plate provides a short-circuit portion in a concave manner at a central portion thereof, and a countersunk portion in a convex manner at a central portion of the short-circuit portion, and
the coaxial central conductor is protected at a center of the countersunk portion by the guide portion.
11. The antenna as recited in claim 10 , wherein a sidewall of the short-circuit portion is inclined.
12. The antenna as recited in claim 11 , wherein a sidewall of the countersunk portion is inclined.
13. The antenna as recited in claim 12 , wherein each of the short-circuit portion and the countersunk portion has a circular shape, and centers of the short-circuit portion and the countersunk portion are aligned with the same straight line.
14. The antenna as recited in claim 10 , wherein a reverse conical conductor is formed at a tip of the coaxial central conductor.
15. The antenna as recited in claim 10 , wherein the antenna with a central frequency of 7.75 GHz, a lower limit frequency of 7.25 GHz, and an upper limit frequency of 7.95 GHz.
16. The antenna as recited in claim 15 , wherein a bandwidth is 700 MHz and a fractional bandwidth is 9%.
17. The antenna as recited in claim 10 , wherein the wide-band feeder circuit comprises an antenna with a central frequency of 7.75 GHz, a lower limit frequency of 7.15GHz, and an upper limit frequency of 8.25 GHz.
18. The antenna as recited in claim 15 , wherein a bandwidth is 1.1 GHz and a fractional bandwidth is 14.2%.