Zebra Dual Band Panel Antenna ML-2452-PNA5-01R 用户手册
产品代码
ML-2452-PNA5-01R
Antenna selection
While several antennas may work in a given
environment, some will provide better coverage
than others. Using the right antenna in the right
location will maximize both the performance and
coverage of your network. Understanding the key
characteristics that describe how an antenna sends
and receives radio frequency signals is critical to
finding the ideal antenna.
environment, some will provide better coverage
than others. Using the right antenna in the right
location will maximize both the performance and
coverage of your network. Understanding the key
characteristics that describe how an antenna sends
and receives radio frequency signals is critical to
finding the ideal antenna.
Motorola Enterprise Wireless LAN products operate
in the 2.4 GHz and 5 GHz ISM bands allocated for
unlicensed use. Access point and access port products
available today support either the 802.11b/g or the
802.11a standard, or both. Wireless devices conforming
to the 802.11b/g standard operate in the 2.4 GHz
ISM band, while 802.11a devices operate in the
5 GHz band. The antennas in this guide are grouped
according to the frequency band they support. Note
that some antennas are designed to operate on either
band. These antennas, described as “Dual-band”
may be connected to radios operating in either the
2.4 or 5 GHz bands, although a single antenna may
not be connected to two radios at the same time.
in the 2.4 GHz and 5 GHz ISM bands allocated for
unlicensed use. Access point and access port products
available today support either the 802.11b/g or the
802.11a standard, or both. Wireless devices conforming
to the 802.11b/g standard operate in the 2.4 GHz
ISM band, while 802.11a devices operate in the
5 GHz band. The antennas in this guide are grouped
according to the frequency band they support. Note
that some antennas are designed to operate on either
band. These antennas, described as “Dual-band”
may be connected to radios operating in either the
2.4 or 5 GHz bands, although a single antenna may
not be connected to two radios at the same time.
Key antenna specifications
In addition to frequency of operation, there are other
key specifications to consider when choosing an
antenna. These characteristics are included for each
Motorola antenna in the tables on page 6, and are
defined below for your reference:
key specifications to consider when choosing an
antenna. These characteristics are included for each
Motorola antenna in the tables on page 6, and are
defined below for your reference:
Pattern
Omni-Directional: Signal radiates from the antenna
in all directions on the horizontal plane.
in all directions on the horizontal plane.
Directional: Signal radiates in a specific direction,
typically described as a beam of given width,
expressed in degrees in the horizontal and
vertical plane. (See Azimuth and Elevation
Beamwidth below)
typically described as a beam of given width,
expressed in degrees in the horizontal and
vertical plane. (See Azimuth and Elevation
Beamwidth below)
Type
Panel: A flat antenna that is mounted to a wall
or other vertical surface and radiates RF energy
(radio waves) directionally away from the wall.
or other vertical surface and radiates RF energy
(radio waves) directionally away from the wall.
They usually have gain greater than 5 dBi and are
not suitable for omni-directional situations. Ideally
suited for long hallways.
not suitable for omni-directional situations. Ideally
suited for long hallways.
Patch: A flat antenna that is mounted on the ceiling
but whose pattern is omni-directional. Most of the
energy goes out horizontally to the sides of the
antenna and equal in all directions.
but whose pattern is omni-directional. Most of the
energy goes out horizontally to the sides of the
antenna and equal in all directions.
Dipole: A tubular antenna that can be either a pipe
shape, a straight flexible rod or a paddle. This antenna
has an omni-directional pattern when placed in a
vertical position. It usually has 2 dBi of gain.
shape, a straight flexible rod or a paddle. This antenna
has an omni-directional pattern when placed in a
vertical position. It usually has 2 dBi of gain.
Dipole Array: Essentially a dipole, a dipole array
is two or more dipoles that are placed one on top
of the other, requiring a longer tube to hold them.
The advantage of a dipole array is that it has
higher gain.
is two or more dipoles that are placed one on top
of the other, requiring a longer tube to hold them.
The advantage of a dipole array is that it has
higher gain.
Parabolic Grid: (PGA) A very directional, dish-like
antenna. Its parabolic reflector focuses the RF energy
like a flashlight. Most of the time the radiating
element is a dipole, but when combined with the
dish, it becomes very directional with gain up to 24
dBi. Usually used in long point-to-point systems.
antenna. Its parabolic reflector focuses the RF energy
like a flashlight. Most of the time the radiating
element is a dipole, but when combined with the
dish, it becomes very directional with gain up to 24
dBi. Usually used in long point-to-point systems.
Yagi: An antenna that has an internal structure
resembling that of typical antennas used for TV
reception (a series of rods perpendicular to a main
rod, making a triangular shape). This is a directional
antenna with less gain than the PGA, typically
around 13 dBi. It may be used in either point-to-point
situations, or to cover a very long, narrow area in
point-to-multi-point situations.
resembling that of typical antennas used for TV
reception (a series of rods perpendicular to a main
rod, making a triangular shape). This is a directional
antenna with less gain than the PGA, typically
around 13 dBi. It may be used in either point-to-point
situations, or to cover a very long, narrow area in
point-to-multi-point situations.
Additional terms
Frequency: the frequency band within which the
antenna performs at the stated specifications.
antenna performs at the stated specifications.
Gain (dBi): The relative amplification of the antenna
with respect to an equivalent isotropic antenna,
expressed on the decibel logarithmic scale.
with respect to an equivalent isotropic antenna,
expressed on the decibel logarithmic scale.
Cable loss (dB): The signal strength loss introduced
by the cable connected to the antenna expressed on
the decibel logarithmic scale.
by the cable connected to the antenna expressed on
the decibel logarithmic scale.
Net gain (dBi): The resulting amplification of the
antenna paired with its cable.
antenna paired with its cable.