Two & Three
MMIC
Section Models
REFLECTIONLESS FILTERS
50Ω DC to 21 GHz
The Big Deal
XLF
XHF
•High Stopband rejection, up to 50 dB
•Patented design terminates stopband signals
•Pass band cut-off up to 11 GHz
•Stop band up to 26 GHz
X-Series
Available in Low Pass
& High Pass designs
•Excellent repeatability through IPD* process
Product Overview
Mini-Circuits’ X-Series of reflectionless filters now includes 2- and 3-section models, giving you ultra-high
rejection in the stopband – up to 50 dB! Reflectionless filters employ a patented filter topology which
absorbs and terminates stopband signals internally rather than reflecting them back to the source. This
new capability enables unique applications for filter circuits beyond those suited to traditional approaches.
Traditional filters are reflective in the stopband, sending signals back to the source at 100% power. These
reflections interact with neighboring components and often result in intermodulation and other interferences.
By eliminating stopband reflections, reflectionless filters can readily be paired with sensitive devices and
used in applications that otherwise require circuits such as isolation amplifiers or attenuators.
Key Features
Easy integration with sensitive reflective
components, e.g. mixers, multipliers
Advantages
Reflectionless filters absorb unwanted signals falling in filter stopband, preventing
reflections back to the source. This reduces generation of additional unwanted
signals without the need for extra components like attenuators, improving system
dynamic range and saving board space.
High stopband rejection, up to 50 dB
Ideal for applications where suppression of strong spurious signals and intermod-
ulation products is needed.
Enables stable integration of wideband
amplifiers
Because reflectionless filters maintain good impedance in the stopband; they
can be integrated with high gain, wideband amplifiers without the risk of creating
instabilities in these out of band regions.
Cascadable
Reflectionless filters can be cascaded in multiple sections to provide sharper and
higher attenuation, while also preventing any standing waves that could affect
passband signals. Low & highpass filters can be cascaded to realize bandpass
filters.
Excellent power handling in a tiny surface
mount device up to 7W in passband
High power handling extends the usability of these filters to the transmit path for
inter-stage filtering.
Small size,
3x3mm/ 4x4 mm/ 5x5mm QFN
Allows replacement of filter/attenuator pairs with a single reflectionless filter,
saving board space.
Excellent repeatability of RF performance
Excellent stability over temperature
Operating temperature up to 105˚C
Through semiconductor IPD process, X-series filters are inherently repeatable for
large volume production.
With 0.3 dB variation over temperature ideal for use in wide temperature range
applications without the need for additional temperature compensation.
Suitable for operation close to high power components.
*IPD – Integrated Passive Device, is a GaAs semiconductor process
®
Mini-Circuits
www.minicircuits.com P.O. Box 350166, Brooklyn, NY 11235-0003 (718) 934-4500 sales@minicircuits.com
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