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Common Antenna Styles
There are literally hundreds of antenna styles and variations that can be
employed with Linx RF modules. Following is a brief discussion of the styles
most commonly utilized. Additional antenna information can be found in
Linx Application Notes AN-00100, AN-00140, AN-00500 and AN-00501.
Whip Style
A whip-style antenna provides outstanding overall
performance and stability. A low-cost whip is can
be easily fabricated from a wire or rod, but most
designers opt for the consistent performance and
cosmetic appeal of a professionally-made model.
To meet this need, Linx offers a wide variety of
straight and reduced-height whip-style antennas in
permanent and connectorized mounting styles.
Figure 28: Whip Style Antennas
L=
The wavelength of the operational frequency determines
an antenna’s overall length. Since a full wavelength is
often quite long, a partial half or quarter-wave antenna is
normally employed. Its size and natural radiation
resistance make it well matched to Linx modules.
The proper length for a straight quarter-wave can be
easily determined using the adjacent formula. It is also
234
F MHz
Figure 29:
L = length in feet of
quarter-wave length
F = operating frequency
in megahertz
possible to reduce the overall height of the antenna by using a helical
winding. This reduces the antenna’s bandwidth, but is a great way to
minimize the antenna’s physical size for compact applications. This also
means that the physical appearance is not always an indicator of the
antenna’s frequency.
Specialty Styles
Linx offers a wide variety of specialized antenna
styles. Many of these styles utilize helical
elements to reduce the overall antenna size while
maintaining reasonable performance. A helical
antenna’s bandwidth is often quite narrow and
the antenna can detune in proximity to other
objects, so care must be exercised in layout and
placement.
– 26 –
Figure 30: Specialty Style Antennas
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