is a lobe the degree between its axis and main lobe radiance is approximately 180 degree.
Despite owning many advantages, the LWA still faces a major problem which is the trade-off between the back lobe
and the length of the LWA.
However, a little back lobe
radiation has been noticed at 4.0 GHz.
From the E plane graph, directional radiation patterns with small back lobe
can be observed (Figure 21(a)).
6 shows the measured radiation pattern, it is found that there is a discrepancy between the simulated and measured one in the back lobe
Compared with Ref 2, the beam is narrower, but the back lobe
The antenna elements can be arrayed in any desired configuration for specific pattern shaping, including tilting side lobe and back lobe
limits and reconfigurable coverage.
The back lobe
is in the opposite direction from the main beam, and the side lobes are at other angles.
In antenna patterns, the radiation is often characterized by three kinds of lobes, i.e., main lobe, side lobe and back lobe
. See Fig.
As clearly shown in Figure 13, they are similar in shape with one main lobe and one back lobe
. The results indicate the back lobes
of all antennas can be considered very small.
Without taking these errors into account, a good correlation still exists between the patterns, even in the back lobe
More importantly, however, it has a small magnitude in a wide region surrounding [[theta].sub.backlobe] = -90[degrees] by virtue of the matching of the back lobe
widths discussed above.