Abstract: [Problem to be Solved] To provide an antenna which can be used in a wide band. [Solution] An antenna 10A includes a dielectric substrate 11, an unbalanced power supply member 12 having a non-power supply unit 23 and a power supply unit 24, a resonance conductor 13 having a connection area 26, a first resonance area 27 and a second resonance area 28, a grounding conductor 14 having a first ground area 32 and a second ground area 33, and a radiation conductor 15 having a first radiation area 37 and a second radiation area 38. At the antenna 10A, first to third radiation stepped portions 42a to 42c are formed at a first rear end portion 41 of the second radiation area 38, and first to third radiation stepped portions 44a to 44c are formed at a second rear end portion 43 of the second radiation area 38.

Abstract: [Problem to be Solved] To provide an antenna which can be used in a wide band. [Solution] An antenna 10A includes a dielectric substrate 11, an unbalanced power supply member 12 having a non-power supply unit 23 and a power supply unit 24, a resonance conductor 13 having a connection area 26, a first resonance area 27 and a second resonance area 28, a grounding conductor 14 having a first ground area 32 and a second ground area 33, and a radiation conductor 15 having a first radiation area 37 and a second radiation area 38. At the antenna 10A, first to third radiation stepped portions 42a to 42c are formed at a first rear end portion 41 of the second radiation area 38, and first to third radiation stepped portions 44a to 44c are formed at a second rear end portion 43 of the second radiation area 38.

Abstract: A one-wavelength loop antenna element (103) shaped like a rectangle is placed close to a radio base plate (101) and further is bent at both end parts toward a feeding section, whereby a current distribution where the current at the tip of turn up becomes zero is formed. Current is concentrated on the loop antenna element (103), so that the current component flowing onto the top of the radio base plate (101) is decreased, the effect produced when a human being carries a radio containing an antenna including the loop antenna element is suppressed, and the directivity responsive to an arrival wave is formed.

Abstract: In an antenna unit adapted to be incorporated inside a main body of a mobile radio set, there are provided a pair of helical antenna elements (102), (103) connected to a balanced feeding line (104), the helical antenna elements having antenna axes in a direction parallel to a base plate (201) of the radio set, and being arranged in proximity to the base plate of the radio set at a sufficiently small distance as compared with their wavelength. By conducting a balanced power supply to the helical antenna elements, an electric current component flowing on the base plate of the radio set can be reduced, thus decreasing influence of the human body when the radio set is carried by the human hand. Additionally, the antenna can posses radiation characteristics of both the electric current type antenna and the magnetic current type antenna, and therefore, the receiving performance when the radio set is tiltedly used will be enhanced.

Abstract: A one-wavelength loop antenna element (103) shaped like a rectangle is placed close to a radio base plate (101) and further is bent at both end parts toward a feeding section, whereby a current distribution where the current at the tip of turn up becomes zero is formed. Current is concentrated on the loop antenna element (103), so that the current component flowing onto the top of the radio base plate (101) is decreased, the effect produced when a human being carries a radio containing an antenna including the loop antenna element is suppressed, and the directivity responsive to an arrival wave is formed.