Back to news

NEW INVAR TUNING ELEMENTS WITH SELF-LOCKING SYSTEM

Exxelia announces the release of new world-unique invar tuning elements featuring a self-locking system. The product has been designed to respond to increasing demand for high frequency tuning elements for space applications.

Working frequencies in Space applications are shifting to Ka, Ku or even Q band, while cavity filters are undergoing the general trend towards miniaturization: this context calls for a much more precise and stable tuning element now offered by Exxelia Temex, daughter company of Exxelia, through their last innovative and unrivalled solution to incorporate a self-locking system into their Invar Tuning Elements.
Invar-36 is a unique Iron-Nickel alloy (64 % Fe / 36 % Ni) sought-after for its very low coefficient of thermal expansion. With 1.1 ppm. K–1 between 0°C and 100°C, Invar-36 is about 17 times more stable than Brass which is the most traditional and common alloy Tuning Elements are made of. The working temperature range in Space is so wide that this property becomes essential for a reliable and stable cavity filter tuning. Self-locking system is a technology commonly used on Tuning Element made of Brass or other soft “easy-to-machine” alloys but is innovative and pretty advanced when applied to hard and tough Invar 36. The design consists of two threaded segments separated by two parallel slots. After cutting both parallel slots, the rotor is compressed in its length in order to create a plastic deformation. Thus, an offset is induced between the two threaded segments which generates a constant tensile stress in the rotor from the moment threaded segments are screwed.

Published on 07 Nov 2016 by Marion Van de Graaf

Exxelia Ohmcraft Custom Resistors Enable Metabolic Analyses of Live Cell Cultures in Pharmaceutical Research

To do so, they must rely on life science research and diagnostic instruments with complex high gain amplifier circuits. Leading manufacturers of this type of equipment have partnered with Exxelia Ohmcraft to design custom, high-resistance surface mount resistors that are essential to the function of these circuits. Specifically, oxygen consumption rate (OCR) and extracellular acidification rate (ECAR) are two key indicators of mitochondrial respiration and glycolysis that provide a systems-level view of cellular metabolic function in cultured cells. The analyzer equipment conducts these measurements automatically. “The accuracy and reliability of these tools are crucial to the researchers’ ability to make progress in their studies, which have the potential to change—and save—lives,” said Eric Van Wormer, Vice President of Exxelia Ohmcraft. “To meet the design needs of this particular application, we developed a custom resistor solution with a unique form factor and used special terminations to facilitate the manufacturability of the end product.” Exxelia Ohmcraft’s technology utilizes the proprietary Micropen electronic printing system to “print” precise, narrow, serpentine lines with resistive ink on a ceramic substrate, producing higher performance resistors over a wider range of values on a smaller surface area than is possible with conventional film resistor technology.

Exxelia Ohmcraft : High Voltage Resistors for the World’s Most Advanced Medical Applications

Our resistors are designed for a variety of products to be used in medical diagnosis, treatment, and prevention. From small, implantable, and non-invasive devices, to large diagnostic imaging equipment, Exxelia Ohmcraft resistors are chosen by medical manufacturers because the operating environments are high voltage and magnetic fields where accuracy and stability are paramount. Exxelia Ohmcraft’s proprietary Micropen® precision printing technology produces superior resistor products ideally suited for medical applications, printing resistors with electrical characteristics that outperform our competitors. Our technology allows us to write a very exact serpentine pattern with more precise line width and length than conventional screen printing. Our Exxelia Ohmcraft serpentine patterned resistors produce superior electrical characteristics, including:     High Voltage (1 - 5 kV up to 50kV) Low Noise / High Ohmic Values Superior TCR and VCR (25 < TCR < 200 ppm/°C)  Resistor Value (> 1 MΩ up to 10 TΩ) Pulse Handling Capability Tolerances to 0.1%       Medical Instruments and Equipment Exxelia Ohmcraft is committed to enabling medical instrument and equipment manufacturers to continue miniaturizing their products without comprising on performance. Physicians and their patients rely on our resistors to maximize the functionality and reliability of designed for each device. Our unique Micropen® precision printing technology produces the pulse-handling capabilities needed for critical medical circuits. Exxelia Ohmcraft’s resistors are found in most defibrillators and across the spectrum of diagnostic imaging equipment.   Products: HVC, SM, HVR, HVD, and Custom   Applications: External defibrillators Internal defibrillators Electrocardiogram (ECG) systems   Medical Instrumentation Improvements to patient monitoring, diagnostic, analytic and medication delivery systems have resulted in an increased quality of patient care. These patient-interface instruments require highly stable components to ensure the accuracy of critical data needed by physicians, nurses, and diagnosticians. Micropen® precision printing technology enables us to manufacture high ohmic-value resistors with ultra-tight TCR and VCRs capable of producing the critical measurements and data required to diagnose, treat and prevent further medical action.   Products: HVC, SM, HVR, HVD, and Custom   Applications: Patient monitoring systems Medical power supplies Respiratory systems Drug pumps Drug delivery systems Prosthetics Medical cables Blood analyzers Laboratory analyzers DNA analyzers   Diagnostic Imaging Advances in diagnostic imaging have led to more accurate and precise diagnoses. As a result, more treatment and preventative options become available to patients. Exxelia Ohmcraft’s resistors are used for many diagnostic imaging applications based on proven reliability and functionality. Imaging equipment manufacturers rely on our leaded and surface-mount resistors to provide the precision and performance required by advanced imaging methods. Tightly controlled TCR and VCR, low noise, and enhanced ESD tolerance make Exxelia Ohmcraft’s high-voltage and high-value resistors a premium component to any medical imaging application.   Products: HVC, SM, HVR, HVD, and Custom   Applications: CT units X-ray systems Ultrasound devices Mammography devices Nuclear imaging systems PET scanners Radiography devices MRI devices Exxelia Ohmcraft is the leader in high performance resistor design and manufacturing. Our proprietary Micropen precision printing technology enables superior precision thick-film resistors. Exxelia Ohmcraft can meet the most challenging space instrument specifications for high voltage and high value resistors.   Exxelia Ohmcraft’s sister division, Exxelia Micropen Medical is at the forefront of medical device product development, providing design engineers with unique insights on conceiving and implementing new designs and features. 
Back to news