Said dipoles are preferably arranged in front of a reflector (33) and form a dipole square when viewed from above, whereby each dipole (111-114) is supplied with current via a symmetrical line (115-118).

The symmetrical two-wire line (42) is at least partially encapsulated within a central portion of a closed pipe (40) comprising a wall (44) that insulates the symmetrical two-wire line from the outer medium.

The invention relates to a dual-polarized dipole antenna which consists of several separate dipoles.

The first shielding wire is a conductive wire parallel to the differential lines, and is located on a symmetric line of the two differential lines.

The trick is to space the dipole centers apart and use short pieces of symmetric transmission line to interconnect them.

Confidence ellipses can be added on the symmetric plots, as shown on the symmetric row plot.

The video signal of the Niko Access Control installation is a symmetrical line signal (1 VPP 100 Ω), while a non-symmetrical coax signal (1 VPP 75 Ω) is the most common standard video signal.

A series of large solar panels forms a symmetrical line at a power plant in the San Luis Valley of central Colorado.

Also, second cutout sections (12a, 12b), line symmetrical about the major axis of the first cutout section (11), are formed at positions away from the first cutout section (11).