Coupled Lines Directional Coupler

Directional couplers are four-port circuits consists of through, isolation, coupling ports. An ideal directional coupler is lossless and has all ports are matched. One of the most common couplers is formed by a pair of coupled transmission lines. When two unshielded transmission lines are in close proximity, power can be coupled from one line to …

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Generalized Chebyshev Filter

In this week article, lets discuss the Generalized Chebyshev class filter. Firstly, here's a video on a Generalized Chebyshev class filter constructed using our EDS HF software. https://www.youtube.com/watch?v=cYPvdXOXlW4 The Design The Generalized Chebyshev filters have equiripple passband characteristics and flexibility in placing transmission zeros arbitrarily. The synthesis of this type of filter is based on …

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Designing Interdigital Filter

There are many distributed line topology that can be used to design a filter. One of these is the Interdigital topology. The interdigital utilizes multiple cascading coupled lines arranged in such a way that the termination of each stub (or called resonator) is alternate between short and open circuit. As one of the planar transmission …

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How to Design Impedance Matching

When designing schematics, impedance matching is an importance process to ensure minimum loss of the design. When a schematic is mismatched, it will result in high reflection of the input signal, this would translate into transfer loss. A schematic that is matched will ensure the lowest possible loss theoretically, that is maximum power transfer. When …

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Transmission Line Filter Using Richard’s Transformation

Transmission Line (TL) In our previous article, we talked about the parasitic capacitance and inductance of circuits designed in lumped element. With majority of device and applications operating in high frequencies, especially with the introduction of 5G at millimeter wave, it is unfeasible to design filters using lumped elements. This is where transmission line type …

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Asymmetric Impedance Scaling and Frequency Transformation

https://youtu.be/acqtEmFCEjs Asymmetric filters are filters whose response are asymmetric in shape. They are useful for many applications that may require a different requirements between the upper and lower stopband. For example difference in upper/lower cut-off frequency, selectivity and insertion loss. This week video, see an example of an asymmetric filter design that applies impedance scaling …

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Designing Lowpass Lumped Element Filter

What are filters? Water filters? Usually that's the confusion by laymen when talking about filters. Electronic filters are components in an electronic system that is used for isolating a bandwidth of frequency either to be used as a channel for data throughput or noise removal. Ever wonder why a radio can have so many stations? …

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