A comparison of band pass filter technologies for communications system applications

Characteristics of electromagnetic and piezoelectric bandpass filters are discussed from the perspective of (commercial) radio land mobile communication systems. Since the mass marketing of hand-held communications products such as portable cellular telephones and radio pagers are driving the need for small, low-loss, low-cost filter technologies, emphasis is placed upon the capabilities and limitations of the various filter types considered in the light of these criteria. The discussions are limited to narrowband (<~5% relative bandwidth) filters