Mark your calendars for Thursday, May 13 at 11 AM EDT to join Knowles Precision Devices, Microwave Journal, and RFMW for a live webinar where we will discuss the filtering challenges for digital broadband receivers in electronic warfare applications.
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.
In this webinar, we will 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 will start the conversation by covering 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. This discussion will include a look at technologies to consider for optimizing filter size with respect to SWAP and required functionality including how high K dielectrics are allowing filter designers to focus on miniaturization.
Figure 1. A diagram of a simplified switch filter bank designed to listen into signals from the UHF to the K band.
We will also discuss the following approach we commonly recommend for building a wideband digital receiver as shown in Figure 2. 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. We will walk through the steps in this double conversion approach as well as how to select the right filtering technology for each job in this type of receiver.
Figure 2. This approach to designing a wideband digital receiver can handle the complex frequency planning involved in converting a wideband input signal.
To learn more about this approach to designing digital broadband receivers for electronic warfare applications and how to address the associated filtering challenges with some of today’s latest technologies, register today for our live webinar.