Microwave Active Filters for Wireless Applications: Systems Approach

The trends in wireless telecommunication terminals speak in favor of adjustable miniature microwave filters. The most potential integrated high-frequency active filter topologies, the active inductors and the loss compensated passive resonators, can be designed to reach the low microwave region. The dynamic range requirements for the cellular phones have proven to be still too demanding for the reported circuits. However, the less demanding filtering specifications of some applications, e.g., the wireless LANs, might be fulfilled with microwave active filters.