Statement (I): Slot antenna is essentially a wave-guide with a slot length of one half lengths with a radiation pattern similar to that of a dipole with plane reflection.
Statement (II): Slot antenna has a gain much higher than that of a horn antenna.

Question

Question

This question was previously asked in

ESE Electronics 2013 Paper 2: Official Paper

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Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
Statement (I) is true but Statement (II) is false
Statement (I) is false but Statement (II) is true

Answer 1

Slot antenna:

The slot antenna is a very efficient radiator.

A λ/2 slot is cut in a flat metal sheet in such a way that the width of the slot is small i.e. w < λ. (Statement I is correct)

Therefore the currents are not confined to the edges of the slot but spread out over the sheet.

F1 Tapesh 04-12-20 Savita D1

The gain of the slot antenna is in the range of 10 – 15 dBi and Horn is in the range of 25 dBi. (Statement II is Incorrect)

Hence, Statement (I) is true but Statement (II) is false.