Abstract: Provided is an antenna device (1) including: an antenna element (120); a substrate (100) on which a ground conductor is provided; a first feeding portion (130); a second feeding portion (140); and a switching section (111, 131, 141). A direction in which high frequency electric current mainly flows in the ground conductor is different from while the first feeding portion (130) feeds the antenna element (120) to while the second feeding portion (140) feeds the antenna element (120).

Abstract: A wireless circuit (100) which is capable of simultaneously outputting a plurality of transmission signals, including: a transmission signal selection circuit (31) which selectively outputs a detecting object signal out of a plurality of transmission signals; and a detection circuit (33) which detects a power of the detecting object signal thus outputted. This enables to provide, by use of a compact configuration, a technique for individually detecting transmission signals which are simultaneously generated by a respective plurality of transmission circuits.

Abstract: A wireless circuit (100) which is capable of simultaneously outputting a plurality of transmission signals, including: a transmission signal selection circuit (31) which selectively outputs a detecting object signal out of a plurality of transmission signals; and a detection circuit (33) which detects a power of the detecting object signal thus outputted. This enables to provide, by use of a compact configuration, a technique for individually detecting transmission signals which are simultaneously generated by a respective plurality of transmission circuits.

Abstract: In a wireless communication device (10), adjustment means (matching controlling means (152)) changes a reactance of a matching section (17), determination means (calculation means (151), matching controlling means (152)) determines whether a resonance frequency of an antenna (11) exists on a side higher than or lower than the operation frequency of the antenna (11) on the basis of a change in an intensity of a signal, which change is caused by a change in the reactance and is detected by a signal intensity detection section (14), and the adjustment means adjusts the reactance so that the resonance frequency is closer to the operation frequency on the basis of a result of determination of the determination means.

Abstract: Used is a battery a battery (100) including: a battery terminal (106); a circuit (108) being electrically connected with the battery terminal (106); and a resonance frequency adjusting section (110) being directly connected or capacitively-coupled with the circuit (108), and being electrically connected with the battery terminal (106) not via the circuit (108). This makes it possible to provide a battery which does not require electrical connection except via a battery terminal for connection with an apparatus on which the battery is mounted, and which battery is unlikely to deteriorate an antenna characteristic.

Abstract: In a wireless communication device (10), adjustment means (matching controlling means (152)) changes a reactance of a matching section (17), determination means (calculation means (151), matching controlling means (152)) determines whether a resonance frequency of an antenna (11) exists on a side higher than or lower than the operation frequency of the antenna (11) on the basis of a change in an intensity of a signal, which change is caused by a change in the reactance and is detected by a signal intensity detection section (14), and the adjustment means adjusts the reactance so that the resonance frequency is closer to the operation frequency on the basis of a result of determination of the determination means.

Abstract: Provided is an antenna device (1) including: an antenna element (120); a substrate (100) on which a ground conductor is provided; a first feeding portion (130); a second feeding portion (140); and a switching section (111, 131, 141). A direction in which high frequency electric current mainly flows in the ground conductor is different from while the first feeding portion (130) feeds the antenna element (120) to while the second feeding portion (140) feeds the antenna element (120).

Abstract: Used is a battery a battery (100) including: a battery terminal (106); a circuit (108) being electrically connected with the battery terminal (106); and a resonance frequency adjusting section (110) being directly connected or capacitively-coupled with the circuit (108), and being electrically connected with the battery terminal (106) not via the circuit (108). This makes it possible to provide a battery which does not require electrical connection except via a battery terminal for connection with an apparatus on which the battery is mounted, and which battery is unlikely to deteriorate an antenna characteristic.