Duplexers are key components for UMTS mobile phones and data cards. They combine transmit and receive filters for simultaneous transmission and reception within a specific frequency band, which is essential for W-CDMA systems. But duplexers are also fundamental for co-banding in mobile phone applications, for example, using a single frequency band for two different radio standards. This is a decisive advantage for mobile phones that need to support both GSM and W-CDMA. New miniaturized duplexers also allow for the integration of more bands into mobile phones without compromising their compact size.
