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Coaxial Resonators

Trans-Tech offers ceramic coaxial line elements in seven sizes and four dielectric constants to span applications from UHF Frequencies up to 6 GHz. The VHF/UHF frequency bands are traditionally awkward for realizing discrete inductors and capacitors. Metallized ceramics provide an attractive alternative, since the wireless communication market now forces a continuous trade-off between performance and miniaturization.

Trans-Tech's ceramic solution offers advantages of high Q, reduced size, better shielding, and temperature performance superior to that obtainable from conventional L-C circuits or microstrip construction.

Two types of coaxial resonators are offered by Trans-Tech, a quarter-wave short (λ/4) and a half-wave open (λ/2). The quarter-wave has thick-film silver applied to one end. The half-wave has both ends un-metallized.

Trans-Tech's four dielectric materials are briefly summarized in the Material Selection chart along with their recommended frequencies of use. The Material Properties Chart (Figure 2.2) can be used to determine the optimum material necessary for an application.


  • Frequency tolerance of 0.5% or 1%
  • Various dielectric constants - Er10 to Er90
  • Rugged construction
  • Low loss silver = Higher Qu
  • Act as parallel resonant circuit


  • Circuit miniaturization
  • Eliminate microphonics
  • Repeatability of design
  • Negligible aging effects
  • Excellent solderability
  • Thermal stabilization


  • Low phase noise VCOs
  • VCO oscillators
  • Duplexer/diplexer filters
  • Band pass/notch filters

Documents and Applications Notes

File / DownloadFile Type

Characteristic Impedance of Coaxial Resonators

Application Notes

Coaxial Resonator Dimensions and Configurations

Application Notes

Coaxial Resonators and Inductors (300 MHz to 6.0 GHz)

Data Sheet

Coaxial Resonators for Voltage-Controlled Oscillator (VCO) Applications

Application Notes

Computer Simulation of Coaxial Resonators

Application Notes

Frequency Tuning of Coaxial Resonators

Application Notes

Glossary of Terms for Coaxial Resonators and Coaxial Inductors

Application Notes

Material Analysis of Trans-Tech Coax Resonator Materials


Measuring SRF and Q of Coaxial Resonators

Application Notes

PCB Filters Reflow Process Compatibility for Lead (Pb)-Free and RoHS Compliant


Qualification Summary for RoHS-Compliance Coaxial Resonators