Antenna apparatus
The invention provides an antenna apparatus including a driven element formed of a rectangular conductor, and a grounding plate which is arranged in proximity to at least one of side edges of the driven element, with a predetermined interval secured therebetween. This construction requires less mounting space, achieves wide bandwidth and low conductor loss.
1. An antenna apparatus comprising:
a driven element formed of a rectangular conductor; and
a grounding plate which is arranged in proximity to at least one of side edges of the driven element, with a predetermined interval secured therebetween;
wherein an interval between the driven element and the grounding plate is in a range of 1/200 to 1/30 times signal wavelength.
2. The antenna apparatus of claim 1 ,
wherein the grounding plate is formed of a substantially rectangular conductor and has a length and a width which are in a range of ⅕ to 1/1 times signal wavelength.
3. The antenna apparatus of claim 1 ,
wherein the driven element has a length in a range of 1/20 to 1/10 times signal wavelength, and has a width in a range of ⅕ to 1/1 times the length.
4. The antenna apparatus of claim 1 ,
wherein the driven element and the grounding plate are arranged on the same plane of a top surface or interior of a substrate made of a dielectric or magnetic body.
5. The antenna apparatus of claim 4 ,
wherein the driven element and the grounding plate arranged on the same plane of a top surface or interior of a substrate made of glass epoxy.
6. The antenna apparatus of claim 1 ,
wherein the driven element is connected to a feeding point via a matching circuit.
7. The antenna apparatus of claim 1 ,
wherein the grounding plate is formed of a substantially rectangular conductor and has a length and a width which are less than 1/1 times signal wavelength.
8. The antenna apparatus of claim 1 ,
wherein the grounding plate has a part cut out which part corresponds to the driven element.
9. An antenna apparatus comprising:
a driven element formed of a rectangular conductor; and
a grounding plate which is arranged in proximity to at least one of side edges of the driven element, with a predetermined interval secured therebetween,
wherein the driven element and the grounding plate are arranged on different planes of top surface or interior of a substrate made of a dielectric or magnetic body.
10. The antenna apparatus according to claim 9 ,
wherein the driven element and the grounding plate are arranged on different planes of a top surface or interior of a substrate made of a material selected from the group consisting of glass epoxy, polytetrafluoroethylene, alumina ceramics and Ni—Zn ferrite.
11. The antenna apparatus according to claim 9 ,
wherein the driven element and the grounding plate are arranged on different planes of a top surface or interior of a substrate made of glass epoxy.
12. The antenna apparatus according to claim 9 ,
wherein the driven element and the grounding plate are arranged on different planes of a top surface or interior of a substrate made of polytetrafluoroethylene.
13. The antenna apparatus according to claim 9 ,
wherein the driven element and the grounding plate are arranged on different planes of a top surface or interior of a substrate made of alumina ceramics.
14. The antenna apparatus according to claim 9 ,
wherein the driven element and the pounding plate are arranged on different planes of a top surface or interior of a substrate made of Ni—Zn ferrite.
15. The antenna apparatus according to claim 9 ,
wherein the grounding plate is arranged in proximity to two side edges of the driven element, with predetermined intervals secured therebetween.
16. The antenna apparatus according to claim 9 ,
wherein the grounding plate is arranged in proximity to three side edges of the driven element, with predetermined intervals secured therebetween.