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Statement (I): Helical antenna has the largest bandwidth, high directivity and circular polarization.

Statement (II): Log-periodic antenna has a broad bandwidth.

Codes:


1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

1 Answer

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Correct Answer - Option 2 : Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Here both the statements are correct about the Helical antenna and log-periodic antenna but they are not related to each other in any context.

Extra Information:

Helical antenna:

  • It is the antenna in which the conducting wire is wound in a helical shape and connected to the ground plate with a feeder line.
  • It is the simplest antenna which provides circularly polarized waves
  • It operates in two modes: Normal mode and Axial mode
  • Simple design
  • Highest directivity
  • Wider bandwidth

 

Log Periodic Antenna:

A log-periodic antenna in that whose impedance is a logarithmically periodic function of frequency

  • Frequency range: 30 MHz to 3 GHz
  • The dipole length and reparations are related by the formula:

          \(\frac{{{R_1}}}{{{R_2}}} = \frac{{{R_2}}}{{{R_3}}} = \frac{{{R_3}}}{{{R_4}}} = \ldots = T = \frac{{{\ell _1}}}{{{\ell _2}}} = \frac{{{\ell _2}}}{{{\ell _3}}} = \frac{{{\ell _3}}}{{{\ell _4}}} = \ldots \) 

   Where, T is the design ratio and T < 1

   R is the distance between the feed and the dipole

   ℓ is the length of the dipole

  • The antenna design is compact.
  • Gain & radiation patterns are varied according to the requirements.

 

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