Product/Service

Harmony Dual Band

Source: DAPA Communications, Inc.
As 900 MHz networks mature and reach capacity limits, carriers seek new avenues to handle throughput. One method is to utilize the 1800 MHz frequency band...
As 900 MHz networks mature and reach capacity limits, carriers seek new avenues to handle throughput. One method is to utilize the 1800 MHz frequency band, which is up to three times the width of the 900 MHz band. This band is ideal for dense network coverage areas.

In these high-density spots, a cost-effective strategy is to add 1800MHz equipment to the existing 900MHz infrastructure. Using the same site appears to be an ideal solution. None the less, it doubles the number of antennas. That could be a problem because:

  • Extra space is not always available on site.
  • Extra rent would have to be paid.
  • It increases the total weight and windload.
  • It detracts from the aesthetics.
  • It doubles the number of transmitting lines.

DAPA offers a solution to these problems by introducing its family of HARMONY(tm) DUAL-BAND ANTENNAS. This new family, engineered with upper side lobe suppression and null filling, is based on two simple ideas: sharing resources and maintaining distinct characteristics.

Combining shared resources

This Dual-band antenna is really two slant 45 antennas in one, sharing, the same radome, the same fixations, and most of the internal parts. If you opt for a model with an integrated low loss diplexer, the same transmitting lines can be used for the two frequency bands. Each antenna is based on a slant 45 design to reduce the effect of fading using polarization diversity rather than spatial diversity.

Maintaining distinct characteristics

Each antenna has its specific gain, electrical downtilt. An optional variable electrical tilt ACCUTILT(tm) allows to simply adjust the electrical tilt of each band. You can specify different tilt for each band to meet your coverage requirements. The isolation between the two bands ensures that the signals received or transmitted in one band will not interfere with the other band.

These dual-band antennas are also the solution of choice for new dual-band networks or expansion scenario.

DAPA Communications, Inc., One Dapa Complex, 182-A East Union Street, Allegany, NY 14706. Tel: 716-373-7228; Fax: 716-373-5758.