RF MEMS for antenna applications

RF MEMS technology can offer enhanced performance over the conventional solid-state devices. Along with other RF MEMS components, antennas have been investigated. This paper presents a unique review and survey of RF MEMS antennas. Here, antennas can be categorized into (i) generic antennas and (ii) antenna circuits. The former employs some forms of mechanical actuation for movements of the radiation elements. With the latter, individual radiation elements are physically stationary and integrated with RF MEMS switches and/or variable capacitors to alter their electrical length and diversity. In addition, (iii) antenna subsystems incorporating RF MEMS tuneable circuits and beam forming networks should not be overlooked. Examples of these antenna categories are described and conclusions drawn.