A Novel Design of Wideband Diplexer for Base Station Applications

A novel design of diplexer for mobile base stations operating within frequency bands 690-862/880-960 MHz is proposed. The use of diplexers allows to implement the simultaneous operation of wideband antenna array within two frequency bands. Suggested diplexer design is based on interdigital filters and coaxial power divider. Full wave analysis and optimization of diplexer is carried out by finite element method implemented in Ansys HFSS. Calculated VSWR is equal to 1.2 within operational bands. The sample of diplexer has been manufactured and successfully tested, the measured and calculated results are in good agreement.