Title :
Accessing to UMTS filtering specifications using new microstrip miniaturized loop-filters
Author :
Goron, E. ; Coupez, J.P. ; Person, C. ; Toutain, Yann ; Lattard, H. ; Perrot, F.
Author_Institution :
ANTENNESSA, Plouzane, France
Abstract :
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.
Keywords :
3G mobile communication; microstrip filters; poles and zeros; resonator filters; 1.9 to 2.17 GHz; 2.5 dB; Tx/Rx channel isolation; UMTS filtering; coupled loop resonator filter; design method; duplexer; insertion loss; microstrip loop filter; out-of-band rejection; transmission zero; 3G mobile communication; Circuit topology; Coupling circuits; Design methodology; Filtering theory; Frequency; Geometry; Insertion loss; Microstrip filters; Propagation losses;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210443
