초록 ▼

A planar antenna fitted with a reflector of small shape and small depth. A reflector 21 of planar shape is provided at the rear face of a radiator 20 of planar shape made of a triangular loop element. The side sections 21b on both sides of the reflector 21 are bent towards the radiator 20 and the se

A planar antenna fitted with a reflector of small shape and small depth. A reflector 21 of planar shape is provided at the rear face of a radiator 20 of planar shape made of a triangular loop element. The side sections 21b on both sides of the reflector 21 are bent towards the radiator 20 and the separation .alpha.2 between the leading edges of the side sections 21b and the side edges of the radiator 20 is thereby reduced. In this way, an excellent electrical characteristic of the planar antenna 2 fitted with a reflector and can be achieved by reducing the separation D2 of the radiator 20 and reflector 21.

대표청구항 ▼

The invention claimed is: 1. A planar antenna fitted with a reflector comprising: a radiator; and a reflector of planar form whereof both side sections, arranged to the rear of and facing towards said radiator with only a prescribed separation (D), are bent towards said radiator, where λ is th

The invention claimed is: 1. A planar antenna fitted with a reflector comprising: a radiator; and a reflector of planar form whereof both side sections, arranged to the rear of and facing towards said radiator with only a prescribed separation (D), are bent towards said radiator, where λ is the wavelength of the central frequency of the operating frequency band, characterized in that said prescribed separation (D) of said radiator and said reflector has a range from about 0.06λ to 0.15λ, and the separation between the leading edges of two side sections in said reflector and said radiator is not greater than 0.06λ. 2. The planar antenna fitted with a reflector of claim 1, characterized in that said radiator is selected from the group consisting of a dipole, stacked dipole, biconical, loop, triangular double loop and rectangular double loop. 3. The planar antenna fitted with a reflector of claim 1, characterized in that said reflector is formed whereof a front face section facing towards said radiator, and bent sections thereof are bent an obtuse angle at the two side sections of said front face section is arranged to face towards said radiator, the two side edges thereof are bent to cross almost rectangularly against said front face section of the leading edge of said bent sections are arranged. 4. A planar antenna fitted with a reflector comprising: a radiator of planar form which has at least upper and lower sides and comprises a double loop element wherein the width of said upper and lower sides is formed wider than that of the other sides thereof; and a reflector of planar form whereof both side sections, arranged to the rear of and facing towards said radiator with only a prescribed separation (D), are bent towards said radiator, where λ is the wavelength of the central frequency of the operating frequency band, characterized in that said prescribed separation (D) of said radiator and said reflector has a range from about 0.06λ to 0.15λ, and the separation between the leading edges of two side sections in said reflector and said radiator is not greater than 0.06λ. 5. The planar antenna fitted with a reflector of claim 4, characterized in that said radiator comprises a triangular double loop element or rectangular double loop element, the width of the upper and lower sides of said radiator being about 0.06 λ to 0.1λ. 6. The planar antenna fitted with a reflector of claim 4, characterized in that said reflector is formed whereof a front face section facing towards said radiator, and bent sections thereof are bent an obtuse angle at the two side sections of said front face section is arranged to face towards said radiator, the two side edges thereof are bent to cross almost rectangularly against said front face section of the leading edge of said bent sections are arranged. 7. A planar antenna fitted with a reflector comprising: a radiator; and a reflector of planar form whereof both side sections of a rectangular metallic plate are bent substantially at right-angles towards the radiator, arranged to the rear of and facing towards said radiator with only a prescribed separation (D), are bent towards said radiator, where λ is the wavelength of the central frequency of the operating frequency band, characterized in that said prescribed separation (D) of said radiator and said reflector has a range from about 0.06 λ to 0.15λ, and the separation between the leading edges of two side sections in said reflector and said radiator is not greater than 0.06λ. 8. The planar antenna fitted with a reflector of claim 7, characterized in that said radiator is selected from the group consisting of a dipole, stacked dipole, biconical, loop, triangular double loop and rectangular double loop. 9. The planar antenna fitted with a reflector of claim 7, characterized in that said reflector is formed whereof a front face section facing towards said radiator, and bent sections thereof are bent an obtuse angle at the two side sections of said front face section is arranged to face towards said radiator, the two side edges thereof are bent to cross almost rectangularly against said front face section of the leading edge of said bent sections are arranged. 10. The planar antenna fitted with a reflector of claim 7, where the radiator is of planar form, has at least upper and lower sides and comprises a double loop element, wherein the width of said upper and lower sides is formed wider than that of the other sides thereof. 11. The planar antenna fitted with a reflector of claim 10, characterized in that said radiator comprises a triangular double loop element or rectangular double loop element, the width of the upper and lower sides of said radiator being about 0.06λ to 0.1λ. 12. The planar antenna fitted with a reflector of claim 10, characterized in that said reflector is formed whereof a front face section facing towards said radiator, and bent sections thereof are bent an obtuse angle at the two side sections of said front face section is arranged to face towards said radiator, the two side edges thereof are bent to cross almost rectangularly against said front face section of the leading edge of said bent sections are arranged.