A waveguide filter is an electronic filter that is constructed in waveguide technology. Waveguides are hollow metal tubes inside which an electromagnetic wave may be transmitted. Filters are a basic component of electronic engineering designs and have numerous applications. Waveguide filters are most useful in the microwave band of frequencies, where they are a convenient size and have low loss. Examples are found in satellite communications, telephone networks, and television broadcasting. Waveguide filters were developed during World War II for radar and electronic countermeasures, but afterwards soon found civilian applications. Post-war development was concerned with reducing size, first with new analysis techniques that eliminated unnecessary components, then by innovations such as dual-mode cavities and ceramic resonators. Waveguides can support a variety of electromagnetic wave modes: both a disadvantage, spurious modes frequently cause problems, and an advantage; dual-mode designs can be much smaller. The chief advantages of waveguide filters are ability to handle high power and low loss. The chief disadvantages are bulk and cost compared to technologies like microstrip.
Read more: https://en.wikipedia.org/wiki/Waveguide_filter
_______________________________ Today's selected anniversaries:
9:
The Western Han Dynasty of China ended after the throne was usurped by Wang Mang (pictured), who founded the Xin Dynasty. https://en.wikipedia.org/wiki/Han_Dynasty
236:
Pope Fabian, who is said to have been chosen by the Holy Spirit by having a dove land on his head, began his papacy. https://en.wikipedia.org/wiki/Pope_Fabian
1863:
Service began on the Metropolitan Railway between Paddington and Farringdon Street, today the oldest segment of the London Underground. https://en.wikipedia.org/wiki/Metropolitan_Railway
1929:
The Adventures of Tintin, a series of popular comic books created by Belgian artist Hergé, first appeared in a children's supplement to the Belgian newspaper Le Vingtième Siècle. https://en.wikipedia.org/wiki/The_Adventures_of_Tintin
1954:
BOAC Flight 781 suffered an explosive decompression at altitude and crashed into the Mediterranean Sea, killing everyone on board. https://en.wikipedia.org/wiki/BOAC_Flight_781
_____________________________ Wiktionary's word of the day:
zeptomole: (chemistry, physics) A small amount of a substance, especially a countable number of atoms or molecules. https://en.wiktionary.org/wiki/zeptomole
___________________________ Wikiquote quote of the day:
I think, here is your emblem To hang in the future sky; Not the cross, not the hive, But this; bright power, dark peace; Fierce consciousness joined with final Disinterestedness; Life with calm death; the falcon’s Realist eyes and act Married to the massive Mysticism of stone, Which failure cannot cast down Nor success make proud. --Robinson Jeffers https://en.wikiquote.org/wiki/Robinson_Jeffers