Mag Mount Antenna's Whip Replaced By V-Stub Wire Collinear

[abcd567]

The coiled antenna in this simulation is similar (but not same) as Flightaware antenna. However the off-frequency behaviour should be similar.

@abcd567

Off Designed-Frequency Behavior of 2 Types of Antennas

Frequency Sweep (From 100 MHz to 2500 MHz) of Wire Collinear Antenna and 1/4 Wavelength Ground Plane Antenna.

The frequency sweep results of a high gain wire collinear antenna show that it not only performs best at its designed frequency, but also performs fairly good at or near sub-multiples and multiple frequencies.

This characteristic of collinears is good for multi-band reception such as single antenna used by Armature Radio Hobbyists for 2 meter band and 6 meter bands. However it has disadvantage for single frequency reception that the RF signals picked from all these multiple & sub-multiple bands necessitates a tuner circuit or a filter at front end (i.e. between antenna and receiver).

The frequency sweep results of a 1/4 wavelength ground plane antenna show that it gives good performance at and near its designed frequency only, and at other far away frequencies its performance is poor. Hence the 1/4 wavelength ground plane antenna picks very little harmonic and sub-harmonic frequency signals.

WIRE COLLINEAR ANTENNA WITH DECOUPLING SLEEVE
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1/4 WAVELENGTH GROUND PLANE ANTENNA (Cantenna)
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