Denys Orlenko

A Small-Size High-Rejection LTCC Diplexer for WLAN Applications Based on a New Dual-Band Bandpass Filter.

This paper presents a new very small low temperature co-fired ceramic (LTCC) diplexer based on a dual-band bandpass filter for wireless LAN (IEEE 802.11 a/b/g) 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.

LTCC triplexer for WiMax applications

In the present work, a design procedure for multiplexer development has been described. This procedure allows to reduce development time by using of some local optimizations instead of one global. LTCC (low-temperature co-fired ceramic) triplexer for WiMax (IEEE 802.16e) applications, designed in accordance with described procedure, has been presented. The measured results agree well with the simulation.

Novel high-rejection LTCC diplexers for dual-band WLAN applications

This paper presents novel highly-integrated LTCC diplexers for dual-band Wireless-LAN (IEEE 802.11 a/b/g) appli- cations. Two diplexer versions with integrated high-rejection filters have been realized and optimized for the receive and for the transmit mode. The measured results demonstrate excellent performance. The realized reference board demonstrates, that the number of components in a dual-band WLAN front-end design can be reduced by a factor of three, due to this new approach. Index Terms - Diplexers, Filters, Wireless LAN, LTCC.

Low profile LTCC balanced filter based on a lumped elements balun for WiMAX applications

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 front-end module have been discussed and a new low profile lumped-element 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.

Implementation of a miniaturized lumped-distributed balun in balanced filtering for wireless applications

This paper reports on miniaturized lumped-distributed balun for balanced filtering applications. Detailed analysis of suppression performance of the lumped-distributed balun is introduced. Different types of baluns and their interconnection in series with filter were considered. Baluns have been implemented using LTCC technology and experimentally validated.

Ultra-low-profile small-size LTCC front-end module (FEM) for WLAN applications based on a novel diplexer design approach

This paper reports on the design of a very compact dual-band highly-integrated front-end module for size-critical wireless applications supporting IEEE 802.11a/b/g standards. The module consists of two novel high-rejection lumped-element diplexers which are connected to one common antenna via single-pole-double-through (SPDT) switch. The novelty of the realized diplexers consists in a new conjugate-matching method which allows to design very compact diplexers without additional matching networks. The LTCC integrated diplexers are placed between two ground planes ensuring high electromagnetic compatibility which allows using them as building blocks of the highly-integrated wireless LAN (WLAN) front-end module. The physical dimensions of the complete module are 3.0×3.0×0.95 mm. Up to date this is a smallest LTCC-based switch-diplexer FEM published so far.

LTCC balanced filter based on a transformer type balun for WLAN 802.11 a application

This paper reports on the design of a balanced filter based on a new transformer type balun. The disadvantages and performance drawbacks of simple second order transformer are discussed and new third order balun structure is proposed. The new structure is realized as broadside coupled lines vertically stacked using multilayer low temperature co-fired ceramic (LTCC) technology. The resulting structure exhibits excellent electrical performance, immunity to manufacturing tolerances and compactness, which allows using this balanced filter as a building block of highly integrated WLAN front-end modules.