Design Of Swithable Stop-Band Filters Based On Csrr And RF Mems

The microwave filter is wildly used in modern microwave communication system and satellite communication system. With the development of microwave communication in the miniaturization direction, the size of the microwave filter is correspondingly required to be much smaller. Very compact design is becoming a quite important indicator of modern microwave filter. In the traditional filter, there are a large number of discrete components and they are the obstacles of the miniaturization of the system. MEMS technology is of great help to solve these problems. Meanwhile, when combined with the latest developments of metamaterial, we can design and fabricate more compact and low power consumption microwave filters with the using of artificial structure with negative magnetic permeability or left handed property.Firstly, this paper introduces the technic features and application fields of RF MEMS technology and metamaterial. Secondly, we has talked about the basic theory of coplanar waveguide transmission line and classic method of filter designing, introduced the general theory of the microwave device research and filter design. Thirdly, this paper studies the structure and equivalent circuit model of split ring resonator (SRR) and complementary split ring resonator (CSRR). Fourthly, this paper has analyzed the electromagnetic properties of the RF MEMS switch and applied it to the tunable filter. The complete structure of the filter and its equivalent lumped circuit is proposed. The full-wave simulation of the structure and the circuit simulation of the equivalent lumped circuit are compared and the result shows the filter works well at the Q-band.