chip mounting no inductances are necessary according to fig3 the antenna port is provided with a shunt inductance 340 which couples the antenna port with ground instead of a transmission line or a pi network this embodiment comprises a shunt inductance 340 at the antenna side thus the antenna side of the tx filter 300 and the antenna side of the rx filter 320 are either coupled directly or through respective bond wire inductances 301 321 with the antenna port which is coupled through shunt inductance 340 with ground this specific arrangement thus results in a transformation of the input impedance which results in a high pass characteristic in a smith diagram this shows as a rotation in a negative direction such as a u2212 90 u00b0 phase rotation however the negative rotation angle may be established in a relatively broad range to achieve appropriate matching for the respective frequency bands of the tx and rx paths in one embodiment the filter topology can be respectively chosen for example in a conventional duplexer as shown in fig1 and 2 the rx filter starts first with a shunt resonator at the antenna side because this results in a shorter delay time requirement however with the shunt inductance 340 being.