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An LTCC test panel including various mm-wave test circuits has been designed and manufactured using a recently developed screen printing process (Thales Microelectronics) having a highly optimised resolution; here evaluated using a minimum microstrip line width/ gap of 2 mil (50.8 µm). In this paper we report on a 60 GHz microstrip coupled lines bandpass filter manufactured on a 3.7 mil (94.0 µm) thick Ferro A6S substrate using a minimum line gap of 2 mil. The electromagnetic effects caused by the top conductor recess were taken into account using direct full-wave simulations (Ansoft HFSS) but also by a circuit simulation methodology based on the use of effective relative permittivity and substrate height parameters [1]. Preliminary measurement results show a 3 dB bandwidth of approximately 5 GHz; a passband insertion loss of 4 dB and a center frequency slightly above the simulated value. This bandpass filter could e.g. serve as an image rejection filter together with the 60 GHz WLAN chipset [2] where it would demonstrate a 55 GHz image suppression of approximately 20 dB

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[1] R. Kulke; W. Simon; A. Lauer et al; “Investigation of Ring-Resonators on Multilayer LTCC; International ´Microwave Symposium Workshops and Short Courses; WMD-09; Phoenix; Az.; 20-25 May 2001.

[2] C. Fager; M. Hasselblad; R. Kozhuharov; L. Landén; T. Masuda; and; H. Zirath; ”A Front-end Chipset for a 60 GHz Radio Transceiver”; Proc. Of 2001 GigaHertz Symposium; 26-27 Nov; Lund; Sweden.

[3] http://www.ferro.com

[4] http://www.thales-microelectronics.com