Webinar: Addressing Filtering Challenges in Digital Broadband Receivers for Electronic Warfare Applications

Posted by Tim Brauner on Jun 30, 2021 9:00:00 AM

Today, electronic warfare applications need to detect a wide variety of signals ranging from UHF communications to GPS and other data signals in the L band to high-frequency radar signals that can fall in the X, S, or K bands. Therefore, these receivers need to operate across an extremely wide range of bandwidths to pick up and understand signals anywhere from 300MHz to 20GHz and beyond. However, a basic general wideband antenna isn’t sufficient for these applications because selectivity is needed to determine what you are actually listening to. Additionally, as if the task of designing an ultra-wideband receiver with selectivity wasn’t challenging enough, RF designers are simultaneously facing pressure to reduce the size, weight, and power (SWaP) of these applications as well.

Electronic Warfare Webinar - Featured Image

In this webinar, we breakdown how you can address these conflicting demands by diving into the building blocks of the receivers used in electronic warfare applications with a focus on filtering needs and technologies. We cover how to build a simplified switch filter bank like the example in Figure 1 to perform pre-selection for “listening in” on the appropriate band of interest.

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Figure 1. A diagram of a simplified switch filter bank that is designed to listen into signals from the UHF to the K band.

This discussion also looks at technologies to consider, including new offerings from Knowles Precision Devices, for optimizing filter size with respect to SWAP and required functionality including how high K dielectrics are allowing filter designers to focus on miniaturization.

We also discuss the approach outlined in Figure 2 that we commonly recommend for building a wideband digital receiver. In this example, the input received by the filter bank can range anywhere between 300MHz to 20GHz while the output needs to be a set intermediate frequency (IF) that can be processed by an ADC with sufficient instantaneous bandwidth to handle the entire channel of interest.

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Figure 2. This approach to designing a wideband digital receiver can handle the complex frequency planning involved in converting a wideband input signal.

This webinar was originally presented live in collaboration with Microwave Journal and RFMW and you can view the on-demand version here.

 

Watch the Webinar

Topics: RF and Microwave, Military and Aerospace, Filtering

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