APEC Investigates Developments in High-Frequency Magnetics [Passive Components]

AbstractIn electronic circuits besides active devices a major part of the components are discrete passive components such as capacitors, resistors and inductors. Especially in the telecommunication circuits, miniaturisation is a major issue. To achieve a high degree of miniaturisation of passive components, thin film processes have been applied. A thin film module for high frequency applications has been demonstrated with a three-dimensional integration of a thin film resistor, a thin film X7R capacitor and a thin film NP0 capacitor processed on top of each other.

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Synthesis of Integrated Passive Components for High-Frequency RF ICs Based on Evolutionary Computation and Machine Learning Techniques

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems ◽

10.1109/tcad.2011.2162067 ◽

2011 ◽

Vol 30 (10) ◽

pp. 1458-1468 ◽

Cited By ~ 34

Author(s):

Bo Liu ◽

Dixian Zhao ◽

Patrick Reynaert ◽

Georges G. E. Gielen

Keyword(s):

Machine Learning ◽

Evolutionary Computation ◽

High Frequency ◽

Machine Learning Techniques ◽

Passive Components ◽

Learning Techniques ◽

Rf Ics

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High Frequency Approaches for LTCC Based Sensors

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/cicmt-2012-tp41 ◽

2012 ◽

Vol 2012 (CICMT) ◽

pp. 000162-000166

Author(s):

Haolun Zhang ◽

Thomas Neuberger ◽

Steve Perini ◽

Mike Lanagan ◽

Elena Semouchkina ◽

...

Keyword(s):

High Frequency ◽

Three Dimensional ◽

Wireless Systems ◽

Microwave Frequency ◽

Sensor System ◽

Resonance Imaging ◽

Dipolar Relaxation ◽

Passive Components ◽

Low Dielectric ◽

Magnetic Resonance Imaging Mri

Low temperature co-fired ceramics (LTCC) have been developed for RF and microwave circuits for a number of applications (i.e. cell phones and wireless systems). The same attributes that make LTCC an important technology for telecommunications are also important for sensors. Compact three-dimensional architectures with low dielectric loss materials are available with LTCC technology. The underlying electric and magnetic responses of materials in the RF and microwave frequency ranges will be discussed and these unique responses can be exploited in a sensor system. Gases, liquids and solids have unique dipolar responses in the RF and microwave ranges. For example, the dielectric relaxation of water has been investigated in water/starch mixtures. Classic dipolar relaxation of water occurs at 30GHz and additional relaxation mechanisms have been found in the 1–10 GHz range because of the starch gelation process. These relaxations could be the basis for a sensor system to monitor the gelation of food starches. In addition, miniature coil assemblies for magnetic resonance imaging (MRI) systems with operation in the 300 MHz to 850 MHz range will be presented. These types of coils with additional passive components are envisioned in a LTCC-based circuit topology.

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Localized Temperature Stability in Multilayer LTCC

Journal of Microelectronics and Electronic Packaging ◽

10.4071/imaps.303 ◽

2011 ◽

Vol 8 (3) ◽

pp. 89-94 ◽

Cited By ~ 1

Author(s):

Steve Dai

Keyword(s):

Low Temperature ◽

Resonant Frequency ◽

Temperature Coefficient ◽

High Frequency ◽

Critical Parameter ◽

Ring Resonator ◽

Temperature Stability ◽

Chemical Interactions ◽

Passive Components ◽

3D Packaging

Low temperature cofired ceramic (LTCC) is a multilayer 3D packaging, interconnection, and integration technology. One of the advantages of LTCC is the ability it affords to integrate passive components via the cofiring processes. For LTCC modules with embedded resonator functions targeting high frequency applications, the temperature coefficient of resonant frequency (τf) is a critical parameter. The base dielectrics of commercial LTCC systems have a τf in the range of −50 ppm/°C to −80 ppm/°C. This study explores a method to achieve zero or near zero τf embedded resonators by incorporating τf compensating materials locally into a multilayer LTCC structure. Chemical interactions and physical compatibility between the τf modifiers and the host LTCC dielectrics are investigated. A stripline (SL) ring resonator with near zero τf is demonstrated in a nonzero τf commercial LTCC.

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