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WHAT ARE MICROWAVE PHASE SHIFTERS?

Microwave phase shifters are devices that alter the phase of the electromagnetic oscillations at the output of a microwave transmission line, with respect to the phase of the oscillations at the input of the line. The phase of a transmission line can be shifted by increasing the length/time of the transmission line or by altering the wavelength.

In microwave solutions, phase shifters are passive microwave devices that change the phase angle of an RF signal. RF waves can combine to strengthen or weaken a signal, depending on if the waves are identical or different. Identical frequencies will strengthen a signal, whereas opposing ones will weaken it. Phase shifters change the angle of an RF signal so that it doesn’t interfere with the wrong signals. This technology maintains strong performance by providing low insertion loss.

We can understand this concept better by considering noise-cancelling headphones, which use some phase shifting principles. In an audio application, instead of adjusting RF and microwave energy, the shift involves the phase of an audio wave in relationship to another wave. Noise-canceling headphones reduce noise by inserting a sound wave that is 180 degrees out of phase with the surrounding noise. The new sound wave has been shifted to cancel out the first wave, thus reducing the noise you hear.

This noise-cancelling example illustrates an extreme result that we do not typically see in microwave applications. Generally, microwave phase shifters only need to change minor increments of a wavelength to achieve the desired performance results.

Phase shifters are used in a variety of applications, including phase modulators, frequency up-converters, testing instruments and phased array antennas. Radiall designs and manufactures analog phase shifters for microwave components and coaxial phase shifters for space qualified components.

Altum RF is a ACETEC.com principal. Visit Altum RF to find out more about their capabilities.

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Design of a mmWave MIMO Radar

This article written by Tero Kiuru and Henrik Forstén, VTT Technical Research Centre of Finland Ltd., Espoo, Finland. Full article is here: Design of a mmWave MIMO Radar | 2021-01-10 | Microwave Journal

Radar uses reflected radio waves to determine the range, angle or velocity of objects. These detection systems, which were once the exclusive domain of the aerospace and defense industry, are now gaining popularity in the consumer industry, most notably for automotive radar applications used in adaptive cruise control and autonomous driving assistance systems.

The complete article in the January, 2021 issue of Microwave Journal

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Akoustis Technology Optimized for 5G & WiFi 6E

Next generation connectivity architectures are demanding solutions that support high-frequency, ultra-wideband, and high-power coexistence RF filter. Years of R&D have uniquely positioned us to handle the industry’s challenges and push the boundaries of what’s possible bringing you the highest quality filter solutions in the market.

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