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Radio-frequency engineering is a subset of electrical engineering that deals with devices that are designed to operate in the radio frequency (RF) spectrum. These devices operate within the range of about 3 kHz up to 300 GHz. Radio-frequency engineering is incorporated into almost everything that transmits or receives a radio wave, which includes, but is not limited to, mobile phones, radios, Wi-Fi, and two-way radios. Radio-frequency engineering is a highly specialized field falling typically in one of two areas: # providing or controlling coverage with some kind of antenna/transmission system # generating or receiving signals to or from that transmission system to other communications electronics or controls. To produce quality results, an in-depth knowledge of mathematics, physics, general electronics theory as well as specialized training in areas such as wave propagation, impedance transformations, filters, microstrip circuit board design, etc. may be required. Because of the many ways RF is conducted both through typical conductors as well as through space, an initial design of an RF circuit usually bears very little resemblance to the final optimized physical circuit. Revisions to the design are often required to achieve intended results. ==Radio electronics== ''Radio electronics'' is concerned with electronic circuits which receive or transmit radio signals. Typically, such circuits must operate at radio frequency and power levels, which imposes special constraints on their design. These constraints increase in their importance with higher frequencies. At microwave frequencies, the reactance of signal traces becomes a crucial part of the physical layout of the circuit. List of radio electronics topics: * RF oscillators: PLL, Voltage-controlled oscillator * Transmitters, transmission lines, RF connectors * Antennas, antenna theory, list of antenna terms * Receivers, tuners * Amplifiers * Modulators, demodulators, detectors * RF filters * RF shielding, Ground plane * PCB layout guidelines * DSSS, noise power * Digital radio 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Radio-frequency engineering」の詳細全文を読む スポンサード リンク
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