NOVELTY - The photovoltaic apparatus comprises thin-film photovoltaic apparatus cells comprising a photovoltaic material (13) to convert photon energy into electrical energy and conducting electrodes (14) to collect and transfer the electrical energy generated by the photovoltaic material, and a rectifier component to convert the energy of the electromagnetic waves received by an antenna (18) into direct current electricity energy and output the electricity energy direct current to a power system or a power storage apparatus.    USE - The photovoltaic apparatus is useful on walls or windows of buildings and exterior panels or windows of cars, and for satellite communication and other wide-band mobile communication systems such as notebook computers and cellular phones.    ADVANTAGE - The photovoltaic apparatus has reduced interference and increased photovoltaic efficiency, and reduces the mismatch between the propagation direction of the radio frequency electromagnetic waves and the planar normal direction of the photovoltaic apparatus cell or the frequency selective surface unit.    DETAILED DESCRIPTION - The photovoltaic apparatus comprises thin-film photovoltaic apparatus cells comprising a photovoltaic material (13) to convert photon energy into electrical energy and conducting electrodes (14) to collect and transfer the electrical energy generated by the photovoltaic material, and a rectifier component to convert the energy of the electromagnetic waves received by an antenna (18) into direct current electricity energy and output the electricity energy direct current to a power system or a power storage apparatus. The photovoltaic apparatus allows an antenna to transmit and receive radio-frequency signals. The arrangement of the conducting electrodes forms an array that is a frequency selective surface (FSS) (17) located in a transmitting or receiving path of the antenna, and a partial penetrable FSS, which has spacing between a reflective surfaces parallel to the FSS. The FSS and the antenna have spacing. A projection of the FSS in the main transmitting or receiving path of the antenna covers the antenna. A shortest distance between the antenna and the FSS reduces FSS-to-antenna interaction, and is 0.159 times the wavelength of operation frequency of the antenna. The photovoltaic apparatus cells are electrically connected in serial or parallel to meet applications of dual polarized antennas. The array is composed of photovoltaic modules comprising photovoltaic apparatus cells having an FSS unit. The conducting electrodes comprise a front electrode (11) located on one side of the photovoltaic material, and a back electrode (12) located on another side of the photovoltaic material. The front electrode and the back electrode are configured in an orthogonal grid manner such that the FSS has a wide pass band. The combination of the FSS and the reflective surface forms a Fabry-Perot resonant cavity. The antenna is arranged for transmitting and receiving wide-band electromagnetic wave signals, and is located in the Fabry-Perot resonant cavity. The reflective surface has periodic structure such that the spacing of the Fabry-Perot resonant cavity is less than one half of the wavelength. The FSS features dual polarization, and features a function of filtering radio frequency electromagnetic waves such that a radio frequency electromagnetic wave undergoes a specific degradation or reflection. The photovoltaic material is made of a silicon semiconductor, III-V compounds, II-VI compounds, I-III-VI compounds, and/or an organic indigo. The frequency of the electromagnetic waves is microwave frequency, millimeter wave frequency or terahertz frequency. The size of FSS unit is determined by adjusting the number and size of photovoltaic apparatus cells in the FSS unit. The spacing of the FSS unit corresponds to penetration/reflection characteristics of radio frequency electromagnetic waves of the FSS unit.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photovoltaic apparatus.    Front electrode (11)    Back electrode (12)    Photovoltaic material (13)    Conducting electrode (14)    Frequency selective surface (17)    Antenna. (18)