Microwave Filter in Satellite Communication

In the previous article, we learnt how microwave filters are used in military around the world in the form of electronic warfare. Today, lets look at how microwave filters are used in satellites. The emergence of satellite technologies in the 1970s has further driven the needs for microwave filters after the increase in importance during …

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Microwave Filter in Electronic Warfare

It has been shown in the past article "The 5G Liver" that microwave filter plays an extremely and equally important role as the human liver which remove interference in any wireless communications. But besides than removing interference, microwave filter is also a key component in creating interference. When is that needed? you would say. It …

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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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Why are Cell Towers Placed on Hilltops?

I'm sure we all notice it, on top of a hill, one would often see a lone solitary telecommunication tower stand amidst the surrounding vegetation and trees. Although not a must, a telecommunication tower is often built on higher elevations. This is due to the mode in which microwave propagate, which is called Line-of-Sight (LOS) …

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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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