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National Bird Day: Why Birds Matter to Us

National Bird Day is celebrated every year on 5 January . This day is observed to spread awareness about birds, their importance in nature, and the need to protect them. Birds are beautiful living beings and play a very important role in keeping our environment healthy. Origin of National Bird Day National Bird Day was first celebrated in the year 2002 . It was started by bird lovers and environmental groups to protect birds from dangers like deforestation, pollution, and illegal hunting. The main aim of this day is to teach people, especially students, why birds are important and how we can help save them. Why Is National Bird Day Celebrated Every Year? National Bird Day is celebrated every year because many bird species are disappearing due to human activities. Cutting trees, using plastic, pollution, and climate change are harming birds and their homes. This day reminds us that: Birds need protection Nature should be respected Everyone has a responsibil...
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Rectangular Cavity Resonator | Microwave electronics

Rectangular cavity resonator

  • A rectangular cavity resonator is a piece of rectangular waveguide of dimension a, b, and c.
  • In figure a rectangular cavity resonator of sides a, b, c is shown.

TE waves in a rectangular cavity resonator

  • Here we will consider about two transverse electric waves, out of two one moves in +z direction and another in -z direction.
  • Let the transverse component of electric field for TE waves propagating along +z direction be
  • This equation give the resonant frequencies for different sets of m, n, p for different cavity modes.
  • If two or more independent cavity modes have the same resonant frequencies then it is known as degenerate frequency.
  • It is found that the modes TE000, TE001, TE010 and TE100 do not exist in the cavity.
  • The lowest modes (dominant mode), which are possible in TE mode are TE101, TE011 etc.
  • The allowed frequencies corresponding to dominant modes is fundamental frequency.
To know more about this lecture please visit on https://youtu.be/GKVhBNvPH8U


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