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While results will vary from antenna model to antenna model and from frequency to frequency, the plots below are representative of the RF performance improvements typically achieved. The blue plots represent the far field, co-polarized radiation patterns and the red plots represent the far field, cross-polarized radiation patterns. Here, the front-to-back ratio, measured within the 30° cone behind the antenna improved from 16 dB to 28 dB with the back lobe suppressor installed.
As is typical with most ±45° polarized antennas, cross-pol radiation in the lower frequency bands is often higher than the level indicated in the planning tool patterns. This is not due to antenna manufactures trying to hide information. Rather, it is due to the accepted industry standard that planning tool patterns are derived from co-polarized radiation patterns rather than total energy radiation patterns. While co-pol patterns may be perfectly adequate for predicting performance at typical macro sectors, they may not adequately predict performance at tightly spaced stadium sectors. ConcealFab’s back lobe suppressors provide an effective way to clean-up unwanted back lobe radiation when predicted performance does not match actual performance.