This paper presents a new very small Low Temperature Co-fired Ceramic (LTCC) diplexer based on a dualband bandpass filter for Wireless LAN (IEEE 802.11 a/bIg) application. The diplexer and the dual-band filter design have been realized and demonstrated in this article. Measurement results agree quite well with simulation. The new type of such diplexer significantly reduces the number of components and the size of dual-band WLAN frontend modules.

A very compact dual-band LTCC module supporting WiMAX IEEE 802.16e-2005 and Wi-Fi IEEE 802.11a/b/g standards is presented. The frontend module (FEM) integrates in less than 50mm² all required passive and active functions for 1x2 (1 Transmit, 2 receive paths) MIMO operability. The FEM package has SMT compatible footprint and is 1.4mm high. Full FEM measurements results show good performance and fully validate the passive integration approach.

This paper reports on a design of a balanced filter based on a new lumped LC type balun. The realization disadvantages of conventional LC baluns integrated in a frontend module have been discussed and a new low profile lumpedelement balun has been proposed. The balanced filter is realized as a combination of a second order band pass filter and the novel LC balun with an additional low-pass circuit. The proposed layout has been realized using multilayer low temperature co-fired ceramic (LTCC) technology. The resulting structure exhibits excellent electrical performance, immunity to manufacturing tolerances and compactness. The realized low profile balanced filter is placed between two ground planes ensuring high electromagnetic compatibility which allows using this balanced filter as a building block of highly integrated WiMAX front-end modules.

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