Compact triple band/quad mode front-end module for US-CDMA handset applications

Compact triple-band/quad mode FEM with newly designed triplexer circuit has been implemented for US-CDMA handset applications. The newly designed triplexer circuit was comprised of single diplexer, parallel resonant circuit, a BPF for GPS, and its impedance matching circuit. In comparison with previously reported triplexer circuit, it had much better performance characteristics and compact size, as expected. Most of simulated performance characteristic parameters were well matched with the measured ones. Since the fabricated triple-band/quad mode front-end module has good performance characteristics, small size/volume and low cost, it will be promising for US-CDMA handset applications. Their design and fabrication technologies will also be useful for advanced RF components and modules. In near future, on the basis of fabricated FEM, PCB embedded triple-band/quad mode FEM will be designed and demonstrated by using RF SOP technologies.