Kostyantyn Markov

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.

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.

Thermal Characterisation of LTCC Frontend Modules with Integrated Power Amplifiers for Wireless LAN Application

This paper investigates the design and evaluation of low temperature co-fired ceramic (LTCC) heatsinks in frontend modules (FEMs) with integrated power amplifiers (PAs) for wireless-LAN IEEE 802.11 applications. The thermal resistance of this heatsink is measured using two chip thermistors and the accuracy of the proposed measurement method is determined. This method is experimentally validated by the high temperature operating life (HTOL) test, and reliability data is extracted for an EPCOS WLAN FEM with integrated PA, which is currently in mass production

A simple LTCC balun for WLAN applications using left-handed (LH) transmission lines (TL)

This paper reports on the design of a novel LC balun based on a replacement circuit of right-handed (RH) and left-handed transmission lines in combination. This approach gives a very simple balun structure with excellent broadband performance. The balun is designed for WLAN applications in the 5 GHz ISM band. Concept of the balun, simulation, realisation and measurement results are presented.