Wireless communication technology has revolutionized our daily life through rapid development in the areas of broadcasting, wireless local area networks (WLAN), wireless sensor networks, mobile communication, and satellite communication etc. [1.01]. Wireless communication systems rely on their ability to select or generate signals with a very precise frequency. Filters are used for the reception of a desired signal in an overly crowded frequency spectrum, in the presence of a substantial amount of interference. In the same systems, oscillators are required for a stable reference frequency. The common feature of filters and oscillators is their use of resonators, of which performance is extremely important, especially in the case of low-noise or low-power designs [1.02].
展开▼
