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It is desired to achieve a right hand circularly polarized wave at 475 MHz having a half power beam width of 39° One of the easiest ways to do this is with a helix antenna It is to be built with a

It is desired to achieve a right-hand circularly polarized wave at 475 MHz having a half power beam width of 39°. One of the easiest ways to do this is with a helix antenna. It is to be built with a pitch angle of 12.5° , and the circumference of one turn is to be one wavelength at the center frequency of operation.

 

(a) Calculate the number of turns needed.

(b) What is the directivity in decibels?

(c) What is the axial ratio of the on-axis fields?

(d) Over what range of frequencies will these parameters remain relatively constant?

(e) Find the input impedance at the design frequency and at the ends of the band.

(f) Evaluate HP at the band ends.

Jun 22 2020 View more View Less

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