UCLA researchers in the Department of Electrical and Computer Engineering have developed narrowband and high-selective filters with zero-insertion loss.
Effective frequency resources have become a critical component in mobile communication systems as their applications diversify. Narrowband and high-selective filters are employed in devices to obtain such frequency resources, but these types of filters suffer from large insertion loss when implemented in a miniaturized format.
UCLA researchers have developed a quality factor enhancement technique that mitigates the large insertion loss issue in narrowband highly-selective miniaturized bandpass filters. The zero-insertion loss characteristic is accomplished by the parametric amplification effect, which compensates any loss introduced by the finite quality factor of passive components, e.g. capacitors, inductors/microstrips. The proposed technique is compatible with conventional integrated circuit (IC) fabrication processes and is potentially operational at high frequency bands.
miniaturized bandpass filters, passive circuits, power amplifiers, resonator filters, time varying circuits, quality factor enhancement