<LTCC @ ÉTS / Research

 

Research projects

Reconfigurable RF and microwave components

Dorra Bahloul is a Ph.D student in the Electrical Engineering Department at École de Technologie Supérieure (ETS) in Montreal, where she began her master studies. Her research interests focus on the development of reconfigurable RF and microwave components and systems, with specific emphasis on MEMS and LTCC technologies. She works on the development of MEMS process directly on LTCC substrate. This process will be then used for the development of novel types of adaptive and miniaturized RF components with enhanced RF performances. An agile amplifier where the different key blocks like matching networks as well as control circuits and thermal management structures are formed on the same LTCC multilayer substrate is a potential application of this work.

 

Reconfigureable RF filter

The primary focus of Mostafa Attaran Kakhki work is designing and enhancement of a compact reconfigureable filter with good efficiency in microwave applications up to 6GHz, with integration capability and reduction in power consumption. Fabricating the design with LTCC technology would reduce the loss and the size of system. Furthermore, utilizing RF-MEMS switches in reconfigurable systems is a new method that has been applied in recent tunable filter researches to overcome the low-Q factor of components. Passive filters could be implemented by lumped elements especially in lower microwave frequency applications. As the first step, individual inductors and capacitors with high quality factor and sufficient self-resonance frequency has been designed. Following pictures shows two band-pass filters which has been designed and fabricated using LTCC for two different frequencies. These designs would be used in a bank of filter during the future works.

 

LTCC micro-fluidic circuits

Achraf Ben Amar is a postdoctoral researcher at LACIME since 2013. He participated in several projects for wireless communication applications. Actually he works on two main projects. The first consist to the development of LTCC micro-fluidic devices for wireless lab-on-chip applications. The demonstrated components can also be used in fluid-tunable RF applications.

 

(a) Conceptual design of a LTCC-based integrated microfluidic measurement chamber (b) Fabricated microfluidic sensor with wire connectors for performing capacitance measurements.

The second project consist to develop piezoelectric devices fabricated directly on LTCC substrate. This devices can be used for miniaturized microwave circuits such as reconfigurable filter and circulator.


LTCC three-dimensional microstructures

The LTCC market is growing very rapidly due to its low investment cost, short development time, ceramics interesting properties and technology flexibility. Despite the LTCC is considered as a thick layers technology, it was successfully used in many applications integrating three-dimensional microstructures. On this basis, the current research work is focusing on investigating new approaches and techniques for the manufacture of new generation of micro/meso-sensors in LTCC technology. Indeed, this latter could be a great platform to co-integrate sensors/actuators through a unique combination of advantageous aspects such as : ease of structuring in 3D, the possibility of making canals, cavities, beams, membranes and the possibility of combining ceramics with many functional materials and unlimited integration density according to the number of LTCC sheets. These meso-sensors require a tiny air gap in addition to a perfect control and prediction of the production process, especially after baking, since the device will shrink in all directions. So this project aims to produce and benefit from LTCC 3D structures in order to integrate them in multiple applications.