Accessing to UMTS filtering specifications using new microstrip miniaturized loop-filters

Erwan Goron (1) , Jean-Philippe Coupez (2) , Christian Person (2, 3) , Yann Toutain (1) , Hervé Lattard (1) , Frédéric Perrot (1)

1 ANTENNESSA ()
2 MO - Département Micro-Ondes
3 LEST - Laboratoire d'Electronique et Systèmes de Télécommunications

A new topology for the design of microstrip loop-filters is proposed in this paper. This new geometry is used in a coupled-loop-resonator filter in order to improve the out of band rejection (by introducing an additional transmission zero), as well as insertion loss (thanks to a significant circuit size reduction). The design methodology of these filters is first described and then experimental performances are discussed. Finally, a high performance duplexer, specified for UMTS frequencies and requirements (i.e. in the 1.9-2.17 GHz frequency band), is presented. Measured insertion loss is lower than 2.5 dB and an isolation level greater than 40 dB is achieved between Tx/Rx channels, thanks to the multiple out of band transmission zeros introduced in the filter synthesis.

Domaines: Electronique

Erwan Goron, Jean-Philippe Coupez, Christian Person, Yann Toutain, Hervé Lattard, et al.. Accessing to UMTS filtering specifications using new microstrip miniaturized loop-filters. IEEE MTT-S international microwave symposium digest, Jun 2003, Philadelphie, États-Unis. pp.1599-1602, ⟨10.1109/MWSYM.2003.1210443⟩. ⟨hal-02359481⟩