Abstract
IF and RF filters were developed for several mobile telephone systems using the well-known two-track filter technique. The filters have been designed for low insertion loss, high selectivity, and steep passband skirts and respond to the specific needs of the targeted system. Thus, IF filters, with insertion losses as low as 2 dB and RF filters with good overall characteristics have been obtained. The filters cover the frequency range from 110 MHz to 1.9 GHz. In addition, sophisticated design software leads to filters that can be easily matched. Examples of some filters at different center frequencies show good agreement between measurement and simulation. >
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