Reconfigurable and Tunable Filtenna for Cognitive LTE Femtocell Base Stations

摘要: A single-port uniplanar antenna with a built-in tunable filter is presented for operation in multiple LTE bands cognitive femtocell applications. The based on monopole microstrip patch fed by coplanar waveguide. frequency reconfigurability achieved using two PIN diodes to couple or decouple ring slot resonator from the feed line. By switching diodes, proposed design can operate either wideband narrowband modes. When operates state, varactor are used continuously tune 2.55 3.2 GHz, while state obtained over 1.35–6.2 GHz band. and their biasing networks have nearly no severe effect characteristics. Prototypes of structure ideal real switches, without varactors, fabricated tested. Measured simulated results good agreement, thus verifying performance design. show that very suitable radio applications, which mode spectrum sensing transmission at different bands.