Georgiy Sevskiy

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.

Cost-minimized 24 GHz pulse oscillator for short-range automotive radar applications

This paper reports on the design of ultrawideband 24 GHz pulse oscillators developed for automotive radar applications. Due to system considerations (range resolution, dynamic range), such oscillator modules need to generate ultra-short coherent pulses. Measurement results of prototype oscillators demonstrate +5 dBm peak output power, less than 1 ns pulse width and excellent coherency. The oscillators were applied in a radar sensor and good performance was achieved.

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.

Novel high-accuracy LTCC-integrated power monitors for 2.4 and 5 GHz Wireless-LAN applications

Miniature LTCC-integrated power monitors for dual-band operation in the 2.4-2.5 GHz and 4.9-5.9 GHz Wireless-LAN bands are presented. The proposed low-cost circuit incorporates a directional coupler and a dual-diode power detector, all integrated in a very small size LTCC circuit. The measured prototypes demonstrate high performance with respect to power detector accuracy, temperature stability and dynamic range.

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.

System-in-Package solutions for WiMAX applications based on LTCC technology

This paper presents a dual-band (2 and 3 GHz) and a single-band (2GHz) highly-integrated WiMAX System-in-Package module based on LTCC (Low Temperature Cofired Ceramics). They comprise of complete passive and active RF frontend plus the RFIC for up- and down-conversion to the base band. Both modules support 1×2 (1 transmit, 2 receive paths) MIMO operability. The top level measurements of the SiPs show full performance and thus fully validate the LTCC integration approach.