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Omni Directional Antennas
Directional Antennas

Cellular, PCS, Data, ISM, WLL, are all technologies migrating to completely wireless systems. Optimization of these new wireless systems requires a combination of high-performance antennas, for which site or base station antennas are the foundation.

Radiall/Larsen manufactures a variety of small base and mircocell antennas to meet many of today's demanding requirements. Our versatile moderate duty omnis, fiberglass radomes, Yagis, and panels offer the selection and performance to meet your system needs. And, in addition to our standard product offering, Radiall/Larsen's engineering staff can work with you to design antennas to your exact specifications.

Base station antennas provide the critical link between the user and the system provider. They also provide connectivity within the system without being directly accessed by the user. Base station antennas, as their name implies, are usually fixed in a specific location in the network and provide connectivity over a geographical area or from point-to-point.Base station antennas can be broken down into two general categories; omni-directional and directional.


Omni Directional Antennas
Omni-directional antennas have radiation patterns that cover the horizon uniformly. Gain greater than unity is achieved by forming a collinear vertical array, which reduces the elevation beamwidth but leaves the azimuth (horizon) pattern unaffected.


Moderate Duty Omni's
Radiall/Larsen's moderate-duty omni antenna radiating elements and ground plane radials are constructed using our trademarked Kulrod process at the heart of which is 17-7 heat treated stainless steel. All base station antennas are supplied with mounting hardware to attach to a pole up to 2" in diameter.

Radome Omni's
RO series antennas feature a ground plane independent design, DC grounded and enclosed in a fiberglass radome. The radome protects the radiating element from the weather and reduces the flexing of the whip in a low frequency vibration environment as would be encountered at the top of long mast.

Design features include:
  • Ground plane independent
  • All-weather construction
  • DC grounded (800/900 MHz models)
  • Power ratings up to 200W
  • Wind load rating 100 mph
 \Products\ro3806nf
Radome Omni's FREQUENCY RANGES
806-866 MHz
824-896 MHz
 890-960 MHz
BSA
BSA Series Omni's
BSA series omni antennas are engineered to provide lasting performance in the most demanding field conditions.

Design features include:
• Heavy, nickel-plated brass square nut radial collar (square nut allows easy removal for extra portability and convenience).
  • 150 and 220 models are DC grounded
  • Power rating 200W
  • Wind load rating 100 mph
 \Asb99\ASB99 Inside\Bsa450c
BSA Series Omni's FREQUENCY RANGES
45-50 MHz
118-121 MHz
131-135 MHz
144-174 MHz
 220-225 MHz
450-470 MHz
406-512 MHz
144-512 MHz
FB Series Omni's
FB series omni antennas are designed for optimum performance in extreme weather conditions.

Design features include:
Compact, easily transportable design
  • All-weather construction
  • Power rating 200W
  • Wind load rating 100 mph
FB Series Omni's FREQUENCY RANGES
136-230 MHz
406-420 MHz
440-460 MHz
450-470 MHz
470-490 MHz
490-512 MHz
 806-866 MHz
824-896 MHz
890-960 MHz
902-928 MHz
1850-1190 MHz
2400-2485 MHz

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Directional Antennas

Directional antennas are used in communication systems where you need gain higher than can be provided by a reasonable omni (> 7 dBi). Directional antennas are useful for remote locations where high gain is required and the direction to a desired transmitter/receiver is known. They are used in cell and microcell applications to divide a geographical region into sectors. This reduces interference in the network allowing a greater number of users to be serviced.

 

Antenna gain and directivity are increased by increasing the effective aperture of the antenna. In a Yagi, this means lengthening the boom and adding more elements, directors, to the antenna. For panel antennas, this means increasing the size of the panel by adding more elements or increasing the spacing between elements.

Yagis
A Yagi (Yagi-Uda) antenna is a parasitic linear array of parallel dipoles. Typical construction uses a single driven dipole with a reflector and director elements excited by near field coupling to the driven element. Yagis are popular due to their rugged construction and relatively high gain.

YA series Yagis are built to precise specifications to perform in extreme weather conditions. They are fully welded for high strength and low noise performance.

Design features include:

  • Fully welded
  • Solid aluminum elements
  • Aluminum tube boom
  • Power rating 300W
  • Wind load rating 100 mph
Yagi' FREQUENCY RANGES
220-225 MHz
406-440 MHz
440-470 MHz
 470-512 MHz
806-896 MHz
890-960 MHz
Panels
Radiall/Larsen's panel antennas use a variety of microstrip element designs. High gains are achieved by combining several elements together with corporate power dividers. Large arrays use an edge taper to reduce side lobes. Gains up to 17 dBi can be readily achieved.

PA series panel antennas are built for PCS, Cellular, Spread Spectrum data and SMR applications. They are microcell pole or building mount directional antennas.

Design features include:

  • Indoor and outdoor applications
  • Precision cut radiating element
  • Excellent front – back ratio
 \Asb99\ASB99 Inside\Pa311240
Yag
Panel's FREQUENCY RANGES
806-866 MHz
824-896 MHz
890-960 MHz
 1850-1990 MHz
2400-2485 MHz

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Availability and Price of antennas and accessories is subject to change without prior notice.
 

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This page was updated on 07/22/2002
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Walter Wenzel, KA2RGI