Cuming Microwave Corp.

Cuming Microwave has a broad range of experience designing and manufacturing microwave lenses. With careful control of shape and dielectric constant, one can create lenses to refract microwave energy to a focal point. Our application engineers can help with selecting the proper material, both for microwave design as well as mechanical characteristics. One unique application for these lenses is a metal backed dielectric lens which can focus and reflect the incoming signal over a very wide incident solid angle. This device can act as a passive radar beacon, reflecting a signal almost as large as the incident energy, over a 60-70 degree solid angle.

Often, when radio frequency sources are located inside a shielded cavity, the RF energy can resonate within the cavity, and interfere with the signal or create crosstalk with other adjacent devices. Microwave absorber (lossy materials) can be strategically placed within the cavity or housing to attenuate resonances and eliminate crosstalk. Many times magnetic microwave absorbers such as our C-RAM FLX, RGDS, GDX or GDSS are used. C-RAM FLX is a tuned narrowband resonant absorber which can be ordered with it’s resonance specified anywhere between 0.8 to 40 GHz. C-RAM RGDS, GDX and GDSS are broadband magnetically loaded microwave absorbers and are very effective for cavity resonance suppression. Cuming Microwave manufactures lossy magnetic rubber sheet materials which can be used for RF suppression. These sheet materials have high RF loss and can attenuate RF fields on a surface or inside a cavity. These materials are lossy and will attenuate over a wide frequency range; they will work better at shorter wavelengths as their relative electrical thickness increases. Magnetic absorbers are not electrically conductive, and can be placed directly over circuits without creating shorts. Cuming Microwave supplies magnetic microwave absorbers in sheet form, and can custom die-cut or water jet-cut parts to a drawing. Microwave absorber materials are often supplied with a pressure-sensitive adhesive backing (peel-and-stick), which works in most applications. However, in extreme conditions—elevated temperature, vibrations, etc, we recommend more durable adhesives to attach these materials.

Cuming Microwave manufactures a full range of epoxy and silicone based sheet and rod stock, loaded with high magnetic loss carbonyl iron and ferrite fillers. The proper filler and loading level can produce a very lossy material in UHF, microwave or millimeter wave frequencies. Unlike carbon based absorbing materials, these products utilize magnetic hysteresis loss and operate on the magnetic field. They are not electrically conductive, and can be placed directly in contact with circuitry. These products can be precision machined like aluminum or a hard plastic to complex final shapes. In addition, we can custom mold materials to shape, and can supply 2-component liquid resins for casting in place. These materials have been used to produce waveguide loads and absorptive housings, and they can be cast directly into RF device packages to attenuate unwanted noise and resonances.

Cuming Microwave offers a line of adhesives for bonding applications. The product line includes urethanes, epoxies and silicone-based systems. Cuming Microwave offers electrically conductive adhesives, sealants and coatings for EMIRFI isolation and electrical path continuity. The product line includes one and two part systems.

Cuming Microwave produces honeycomb microwave absorbers in both flat and pyramidal materials. Click on our products and technical bulletins below or call us with any questions you may have. We would be happy to assist you with choosing the best materials for your project no matter what the size.

Cuming Microwave Corporation’s subsidiary Cuming-Lehman Chambers, Inc. is the world’s leading supply and builder of radar absorbing materials and dielectric materials for the electronic, telecommunications and defense aerospace industries. Since 1985, Cuming Microwave Cuming-Lehman Chambers has been designing and building anechoic chambers for the commercial and defense industries with a focus on quality work and materials that far surpass the competition. Through this synergy of knowledge and experience our combined company teams can develop a state-of-the-art anechoic testing environment custom built to your specifications. Leverage our experience and consider us for your next project. Both our companies are available to answer your questions when you’re ready to discuss a world-class anechoic chamber design and build.