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

WiMax system-in-package solutions based on LTCC- technology

“…Inside the multilayer LTCC matching circuits, DC-and RF-routing as well as passive structures like filters, baluns and multiplexers are implemented [2][3][4][5][6][7]. LTCC has also been proven a viable platform for integration of power amplifiers and other active components with respect to thermal dissipation [8].…”

Second order bandstop and bandpass filters using transformers

“…Second order bandpass filters have also been constructed around transformers using coupled resonators [16,17], but their design is primarily reserved for microwave frequencies. All the while their performance is also highly dependent on the coupling coefficient between the resonators and resonator quality factor.…”

“…Usually when combined with filters, filtering typically precedes the transformer to shape or band-limit signals, as used in xDSL systems, the most common example being the filters in splitters for ADSL/POTS systems [8][9][10][11]. However, filters are rarely built around magnetic transformers with a few attempts in the literature [12][13][14][15][16][17]. In the work of [14,15] complex filters were constructed using linear transformers to build high order filters.…”

Highly-integrated dual-band front-end module for WLAN and WiMAX applications based on LTCC technology

“…LTCC is a multilayer ceramic that uses area very efficiently in three dimensions. Inside the LTCC matching circuits, DC-routing as well as passive structures like filters, baluns and multiplexers can be implemented [4], [5]. LTCC has also been proven a viable platform for integration of power amplifiers and other active components with respect to thermal dissipation [6].…”