To respond to the need for dielectric substrates for microwave parts, we developed materials with various dielectric constants and frequency temperature coefficients.

Features:

High dielectric constant (εr= 10 ~ 93) enabling a more compact resonator design

High Q value of the dielectric material is closer to cavity resonator (lower tan δ)

Low, controllable temperature coefficient (Τf)

Special shapes and sizes can be manufactured

Suggested Applications: Base station for cellular communications systems, microwave circuits, high frequency capacitors

Applications     

Dielectric filters for mobile communications.  

Dielectric resonators for Base stations.  

Substrates for high frequency circuits and capacitors.

Basic Material Properties of Dielectric Ceramics     

Size of Resonators  

The size of the resonator with the relative dielectric constant εr is scaled down in comparison with the metallic cavity-resonator by a factor of 1/√εr

Q-value  

The Q-value is determined approximately by the dielectric loss (tan δ) and the Q-value of the resonator increases as the dielectric loss decreases.  

Temperature Coefficient of Resonant Frequency (Tf)  

Temperature coefficient of resonant frequency is determined by Te and linear thermal expansion coefficient (Μ)

Overview of NTK Microwave Dielectric Components

NTK dielectric materials chart

NTK dielectric component shapes

About NTK part numbering

Measurement technique for Tf and εr

NTK dielectric materials detail

Dielectric resonators by type

Disk type (MDD)

Rod type (MDD)

Cylindrical (MDC)

Cylindrical with integral support (MDE)

Cylindrical with glued on support (MDG)

Support for cylindrical  series (MDP)

Dielectric Substrate

NTK dielectric substrate materials properties

Large size and non-standard shapes; for resonators, substrates, and structural ceramics are also available. Please contact our local offices for more details.