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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 design-
ers 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 36: 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 37:
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 maintain-
ing 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.
– 30 –
Figure 38: Specialty Style Antennas
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