Tunable notch filter critical for ETSI/3GPP test specifications

December 05, 2019 //By Jean-Pierre Joosting
Tunable notch filter critical for ETSI/3GPP test specifications
Ranatec, a part of the Qamcom Technology AB, has added a new, state-of-the-art notch filter for RF test and measurement to its product portfolio that targets formal conformance testing by accredited test houses and internal verification processes executed by mobile device vendors.

With a continued focus on design and manufacturing of test and measurement equipment for the most demanding niche RF and microwave applications, the Ranatec RI  266 tunable notch filter covers all sub-6 mobile bands and channel bandwidths – first of its kind on the market. RI 266 provides comprehensive coverage of all sub-6 channel plans for design verification, product certification and product testing.

The notch filter is designed to aid test houses and mobile device vendors in meeting the extensive set of ETSI/3GPP conformance test specifications (TS 136 521-1 for LTE and TS 138 521-1 for 5G NR) stipulating levels of radio properties to be verified for enabling high quality wireless access of mobile devices. Two key objectives for the conformance test specification are to detail requirements applicable for any mobile device with respect to transmitter output spurious emissions and receiver blocking characteristics.

According to Ranatec, obtaining a dynamic range in testing of RF devices, products and systems is a common measurement challenge. The traditional approach is employing extensive filter-banks of increasing complexity to selectively suppress parts of the spectrum while detecting weak signals in the un-suppressed part. For each new generation of mobile devices and complexity introduced with an ever-increasing coverage in terms of frequency bands and channel bandwidths, measuring spurious emissions in all relevant operational modes becomes a significant challenge as the complexity of conventional filter banks becomes unmanageable.

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