8). MMANA file for the antennas (Figure 7- cca_open_corner, Figure 8- cca_bended) may be loaded
by link below. You may recalculate the dimensions (using function
“Scale” at MMANA) for any frequency you need.
Compact Cage Antenna is a symmetric antenna, so, it
is required to feed the antenna using a BalUn. Otherwise coaxial
cable feeder would affect antenna input impedance and radiation
patterns. As a BalUn we use 5-10 ferrite cores on the coax near
the feeding point. You may wind 3-6 turns of the coax on a larger
ferrite ring as well (near the feeding point).
Here are some building notes: for example, sides of
the CCA for the 10-meters are near 1 meter in length. So, the
antenna can be made from a copper or aluminum tube 5-10-millimeters
in diameter. For lower bands you may use a copper wire 1-3 mm,
stretched by some dielectric frame. For UHF-VHF bands the antenna
may be made of any bimetallic conductor.
Some advantages of the CCA:
similar to usual full sized loop.
is close to dipole’s gain.
4. All-directional radiation pattern in