In recent times in wireless telecommunication devices the value of a working frequency gradually shifts to the High frequency band varying the boundaries of application up to 1 GHz. As known, resonator is a key element in microwave devices. For example, dielectric resonators are widely used in highsensitive sensors, in calibration equipment and in precised research works. The great interest is attracted to components combining the possibility of operation in the narrow frequency band and miniature sizes. Among producers one can note Temex-Ceramics, which has developed the raw of materials and resonators corresponding all requirements of the market.
Temex-Ceramics dielectric resonators are characterised by a compact case, reliability, temperature stability and low cost.
6 types of materials: E2000...E7000 p are suitable for a frequency band 800 MHz...50 GHzand also are characterised by a high Q factor and dielectric permeability (εr)(24 ...78).
Such components are being produced on the base of dielectric with metallizing surface with shape of disk or cylinder without central hole. The most commonly used mode of dielectric resonators in many applications is the TE01δ (Transverse Electric Field). Dielectric resonator traps microwave energy in an extremely small band of frequencies within the confines of the resonator volume. This energy is reflected back into the resonator due to the big gap in permittivity at the boundary of the resonator (air with ε = 1).
- Isolated dielectric resonator is characterised by a resonant f0 which correspond minimum of ldielectric losses. This frequency f is primarily determined by the material dielectric
constant (εr) and the volu,eV (мм³) of the resonator. This formula can be used to give a preliminary determination (within 5 to 10%) of the size.
Nevertheless, it is worth to point that a frequency correlation between the customer’s test jig and the Temex Ceramics one has to be made according to the former sampling results.
The key reason for choosing a dielectric resonator is the size reduction afforded by a high εr compared to a cavity air filter. It indeed appears according to the above formula, that the dielectric constant determines the resonator dimension at a given frequency. The higher the dielectric constant, the smaller the space within which the fields are concentrated, the lower the dimension at a defined frequency.
- The Q value of a dielectric resonator is the ratio between the energy stored within the resonator to the energy dissipated in the air per cycle. It defines the losses in the material which are represented by the equation, where: δ is the loss angle, ε’ the dielectric constant and ε'' the dielectric losses.
The structure of ordering codeE2036 C 11.00x4.00x5.35 +/-50, где
E2036 - material E2000, See dielectric families
С - Shape (D - disk, C - cylinder, S - Square)
11.00x4.00x5.35 - dimensions
+/-50 - tolerance in frequency