Filtering Without Reflections: Flattening Multiplier Chain Conversion Efficiency & More

A new class of filter, which presents broadband matched impedance at it's ports, has recently been invented and made available. This new device, the reflectionless filter, has demonstrated a variety of benefits when used to replace conventional filters in a signal chain. This white paper briefly introduces the reflectionless filter and compares conventional filter and reflectionless filter behavior. Use cases are presented examining how reflectionless filters can improve system performance when used with mixers, ADCs, and receiver signal chains. Lastly, an experiment is described and test results presented to compare the conversion loss ripple in multiplier chains when reflectionless and reflective filters are used to filter spurious signals.

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MMIC Surface Mount Power Splitter/Combiner: EPQ-133+

Mini-Circuits’ EPQ-133+ is a wideband 7 to 12.5 GHz, 90° hybrid. It splits an input signal into two output signals with quadrature phase shift between them. It provides low loss, wideband in a small layout size and handles high power with good VSWR. Features include low insertion loss, 0.7 dB typ. at 9 to 10 GHz; good isolation, 19 dB typ. at 9 to 10 GHz; miniature size, 4 x 4 mm and high power.

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Surface-Mount Bi-Directional Coupler: BDCH-35-272

Mini-Circuits has expanded the company’s offering of surface-mount couplers with a series of stripline-based models providing extremely high power handling in a miniature, low-profile printed laminate form factor. Model BDCH-35-272 is a bi-directional coupler which achieves 150 W RF power handling for applications from 700 to 2700 MHz including DAS, transmission signal monitoring, antenna reflection monitoring and more.

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