Abstract: A radio-frequency circuit that conveys a radio-frequency signal that is of a predetermined frequency band and modulated using 256-Quadrature Amplitude Modulation (QAM). The magnitude slope, which is the ratio of (i) the change in a magnitude ratio between an input signal and an output signal to (ii) the change in the frequency of the input signal, is at least ?0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band.

Abstract: A radio-frequency circuit that conveys a radio-frequency signal that is of a predetermined frequency band and modulated using 256-Quadrature Amplitude Modulation (QAM). The magnitude slope, which is the ratio of (i) the change in a magnitude ratio between an input signal and an output signal to (ii) the change in the frequency of the input signal, is at least ?0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band.

Abstract: An antenna having a high design freedom, a wide bandwidth characteristic, and a high efficiency characteristic, and a wireless communication device equipped therewith, are provided. The antenna includes at least first and second radiation electrodes and a feeding electrode that faces each of the radiation electrodes such that capacitance occurs between each of the radiation electrodes and the feeding electrode. Each of the radiation electrodes includes a first end portion thereof connected to a ground electrode and a second end portion open, and is capacitively fed by the feeding electrode.