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Epec's Blog | Electronics Manufacturing Solutions


Interpreting RF PCB Laminate Material Data Sheets

Written by Mark Stanley
Posted on February 16, 2018 at 11:25 AM

A printed circuit board (PCB) is an inexpensive and compact way to create many of the necessary interconnects between RF components in a subsystem. The interconnects are most often created with stripline and microstrip transmission lines, as well as vertical coaxial transmission lines created with plated through hole patterns.

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Creating Low Pass High Pass Band Stop Filter Designs

Written by Mark Stanley
Posted on February 8, 2018 at 4:24 PM

A pure notch or band stop filter (also called band reject filter) works by creating a Voltage Standing Wave Ratio (VSWR) resonance over a narrow bandwidth. This creates near total reflection over that bandwidth, while having very little reflection in the surrounding pass bands. By the nature of their creation, these notch filters are typically narrow band. Bandwidth comes linearly with added resonators, increasing size and loss.

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Achieve Very Broad Bandwidth With High Pass/Low Pass Series Elements

Written by Mark Stanley
Posted on January 24, 2018 at 4:36 PM

For many narrow to wide bandwidth band pass applications, pure band pass filters (also bandpass filters or BPF) are a good fit, - forming rejection bands below and above the passband in a single filter. Coupled line, combline, and interdigital are three pure band pass filter types. Pure filters can be the most efficient solutions for loss and physical footprint where the specs mandate their usage. For ultra-wideband applications, pure solutions may require too many poles making physical size too large and insertion loss too high for many systems.

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Impacts of Manufacturing Tolerance on Filter Performance and Yields

Written by Mark Stanley
Posted on January 11, 2018 at 2:58 PM
Understanding the difference between modeled performance and test data is often the most challenging part of an RF filter or microwave filter build. This difference can be broken down into two parts – modeling inaccuracies and manufacturing tolerances. The possible sources of modeling inaccuracies are vast and won’t be addressed here. The various impacts of manufacturing tolerance, how to predict them, and tune around them, are issues we can work to correct.

 

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Manufacturing Issues with RF Circuit Boards

Written by Al Wright
Posted on January 5, 2018 at 2:02 PM

If you’re a designer of RF or microwave printed circuit boards you’ve probably already selected a laminate material that is appropriate to your project, having based your choice primarily on the electrical requirements of the RF circuit, such as signal speed, loss rate etc. Be careful however not to overlook the fact that the specialty materials used in such designs also possess unusual mechanical characteristics; processing is different from that of normal FR4 boards.

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Suspended Substrate Stripline vs Lumped Element RF Filters

Written by Mark Stanley
Posted on October 23, 2017 at 11:00 AM

Based on the application, electrical, mechanical requirements, and knowing what type of filter topology to use can help exceed the performance of the product. Both of these designs use specific topologies based on frequency and power handling requirements.

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How to Create an RF Diplexer Design

Written by Mark Stanley
Posted on October 13, 2017 at 1:52 PM

The typical use of a diplexer (three port device) enables source transmitters operating on two separate frequencies to use the same antenna. In other applications, the diplexer allows a single antenna to transmit and receive on discreet frequencies. Additionally, a diplexer will provide the ability for an antenna to transmit and receive simultaneously.

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Microwave Filter Design For High-Reliability Applications

Written by Mark Stanley
Posted on September 19, 2017 at 11:06 AM

When designing and manufacturing passive broadband high frequency cascaded LC filters (inductor and capacitor), a lot of undesirable component interactions can occur if not properly managed. The goal is to minimize the difference between an RF microwave filter design constructed with ideal components and one using commercial off-the-shelf (COTS) and custom manufactured components.

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