webCOAX Coaxial Resonator Selector
Coaxial resonators are key to precision and consistency. Trans-Tech offers ceramic coaxial line elements in seven sizes and four dielectric constants, covering applications from 300 MHz to 6 GHz. The Very High Frequency (VHF) and Ultra High Frequency (UHF) bands have traditionally been challenging for implementing discrete inductors and capacitors. Metallized ceramics provide an appealing alternative, as the wireless communication market constantly demands a balance between performance and miniaturization.
Our ceramic solution offers numerous advantages, including a high Quality Factor (Q), reduced size, better shielding, and superior temperature performance when compared to conventional LC circuits or microstrip construction.
Two types of coaxial resonators are available: a quarter-wave short (λ/4) and a half-wave open (λ/2). The quarter-wave resonator features a thick-film silver applied to one end, while the half-wave resonator has both ends unmetallized.
We offer four dielectric materials, along with the recommended frequencies of use. Our extensive range of options ensures access to the best solutions for your specific needs, maximizing performance and miniaturization in the wireless communication market.
Trans-Tech’s coaxial inductors are commonly used in the resonant circuit of voltage-controlled oscillators (VCOs), where a varactor offers the tuning capability. Designers often face trade-offs between achieving high Q for optimal phase noise and balancing component size with circuit board real estate. We can help navigate these trade-offs and find the exacting solution for your needs.
In addition, Trans-Tech’s webCOAX Program offers valuable assistance in determining the most suitable part for a specific application. Application notes and references provide example circuits, fundamental principles, and helpful hints to support engineers in making informed decisions.
By offering comprehensive tools and resources, we help designers efficiently identify and select the best coaxial inductors for your needs, striking an ideal balance between high performance and space-saving requirements.
Applications
- Low phase noise VCOs
- DROs
- Narrow band filters
- Nationwide pagers
- Duplexers
- GPS
- UHF-tuned potential amplifiers
- Wireless communications
- Tuned oscillators
Features
- Frequency tuned to 0.5% and 1.0%
- High dielectric constant
- Rugged construction
- Low-loss silver
- Acts as a parallel resonant circuit or high quality inductor
- 2 mm to 20 mm designs available
- Circuit miniaturization
- Eliminates microphonics
- Repeatability of design
- Negligible aging effects
- Excellent solderability
- Improved circuit Q
- High resonant impedance
- Automation compatible
Frequently Asked Questions
A coaxial resonator is a ceramic element with metallized surfaces that acts as a transmission line resonator. It stores electromagnetic energy at a specific frequency determined by its physical length, dielectric constant, and end conditions (open or shorted). Coaxial resonators offer higher Q and better shielding than discrete LC components, making them preferred for narrowband filter and oscillator applications in the VHF through microwave range.
Start with your target frequency and available board space. Trans-Tech offers seven physical sizes and four dielectric constants, and our webCOAX design tool can help you narrow the options. Our applications engineers are also available to work through the trade-offs with you.
They’re the same physical component used in different circuit configurations. When placed in a circuit near its resonant frequency, it acts as a resonator. When used well below resonance in a VCO tuning circuit with a varactor, it behaves as a high-Q inductor. Trans-Tech manufactures both from the same ceramic elements.
Yes. Our Card Coax software assists with coaxial inductor selection for VCO applications, and our applications engineering team provides design support for optimizing phase noise, tuning range, and circuit layout.