Characterization of an Experimental Ferrite LTCC Tape System for Microwave and Millimeter-Wave Applications

Abstract

An experimental-low temperature cofired ceramic (LTCC) ferrite tape system is characterized using circuits that are fabricated from the very material under test. Such in situ circuits provide data that are thought to be more representative of the performance obtainable by more complicated circuitry that will eventually be made from the same material using the same fabrication method. Emphasis is placed on simple measurements that can be performed using a minimum amount of equipment. For the first time, a compact in situ LTCC solenoid transformer is used to measure the magnetostatic properties of the ferrite, yielding a measured saturation flux density of 230 mT, a remanence of 136 mT, and a coercivity of 688 A/m. The peak linear relative permeability of the ferrite is 97 and its Curie temperature is low, only 117 C. A novel two-port line-connected ring resonator is used to characterize the material in the 6-40 GHz range. At frequencies above 20 GHz, the relative permittivity of the ferrite is 11.0, whereas its loss tangent ranges from 0.002 to 0.004, demonstrating the ferrite's suitability for use in microwave and millimeter-wave circuitry.

Ultra-High-Frequency Behavior of BaFe$_{12}$O$_{19}$ Hexaferrite for LTCC Substrates

“…Such examples are found in inductors, filters, etc., for LTCC in the radio frequency regime [1]- [3]. The purview of magnetic devices can be expanded to include applications, such as radar absorbents, transformers, and various nonreciprocal devices through the use of ferrite materials [4], [5]. In fact, ferrites are the first choice materials for these devices.…”

Design of band-pass filter based on different materials in LTCC/LTCF technology

“…LTCC (Low Temperature Co-fired Ceramics) has become the key technology of packaging for the integrated of passive components due to its higher performance, reliability and plays an important role in increasing higher frequency, decreasing the loss [1][2][3]. LTCC is a solid, dense and reliable package, to make multi-storey structure, by integrating passive components such as resistors, capacitors and inductors to achieve miniaturization.…”

NiZnCu ferrite applied for LTCC microinductor

“…Recently, low temperature co-fired ceramics (LTCCs) have been intensively studied for these practical applications [1][2][3][4][5]. Low temperature co-fired ceramic technology is one of the most promising integrated technologies.…”

“…This method is a feasible one for preparing ceramic tapes with different electrical and magnetic properties for multilayer ceramic devices [5,9,10]. This paper describes the synthesis and tape casting process for ferromagnetic Ni 0.3 Zn 0.62 Cu 0.08 Fe 2 O 4 ferrite.…”