The application of frequency-selective devices operating on the base of resonance phenomena in dielectrics with high dielectric permeability is interesting from the point of view of decreasing of devices weight, sizes and cost. Among such frequency-selective elements one can note pass-band filters, low-frequency and high-frequency filters and others.

Resonatoris the key element of a filter which represent a metalizing surface in the form of disk or cylinder. Together with complete discs and cylinders the construction with coaxial hole is also produced. Such resonator represent a ceramic tube. Internal and external walls of a tube are coated by conducting films. The tube is placed in the metallic case.

The choise of a material with high dielectric permeability is determined by a possibility of miniature devices producing. So, the permeability in ceramic materials varies from 9 ± 0,5 to 98 ± 1. The using of ceramics in dielectric resonators allows to reach improved technical characteristics and low microwave losses.

One of the main producers of dielectric resonators on the base of high quality resonators for microwave devices is Temex-Ceramics (France). In 2012 the company has become a part of companies group Exxelia Group - one of European leaders in the filed of electronic parts for microwave devices supplying.

Coaxial ceramic resonatorts

Temex-Ceramics produces a wide range of ceramic coaxial resonators with high Q factor for the range from 300MHz to 6GHz, produced on the base of ceramics with dielectric permeability (ε_r) 21, 37, 90. Such resonators are recommended for using in devices of cellular network, duplexers, oscillators, GPS, narrowband filters.

The length of a contour can be determined on the basis of predetermined frequency and dielectric permeability of the material according to the following equation:

Dimensions and materials for Temex-Ceramics ceramic coaxial resonators:

Series	Dimensions		Frequency range(λ/4)			Impedance Z			Detailed information
	S, mm	d, mm	εr=21	εr=37	εr=90	εr=21	εr=37	εr=90
CRS02	2.0±0.2	0.65±0.1	2000-4000 MHz	1500-3000 MHz	900-2000 MHz	16.5	12.5	8
CRS03	3.0±0.2	0.95±0.1	1500-4000 MHz	1500-3000 MHz	650-2000 MHz	16.0	12.0	7.5
CRS04	4.0±0.2	1.5±0.1	1000-4000 МГц	800-3000 МГц	450-2000 МГц	14.0	10.5	6.5
CRS24	4.0±0.2	2±0.1	1000-4000 MHz	800-3000 MHz	450-2000 MHz	10.0	7.5	5.0
CRS06	6.0±0.2	2±0.1	600-2500 MHz	500-2000 MHz	450-1000 MHz	15.5	11.5	7.5
CRS26	6.0±0.2	2.5±0.1	600-2500 MHz	500-2000 MHz	450-1000 MHz	12.5	9.5	6.0
CRS08	8.0±0.2	2.7±0.2				15.0	11.5	7.0
CRS10	10.0±0.2	3.3±0.2				15.5	11.5	7.5
CRS12	12.0±0.2	3.55±0.2	600-1200 MHz	450-1000 MHz	300-650 MHz	17.0	12.5	8.0
CRS412	12.0±0.2	3.55±0.2	600-1200 MHz	450-1000 MHz	300-650 MHz	15.5	11.5	7.5

Additional information

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For coaxial resonators choosing one can use online Temex-Ceramics program