Contributed to Wikipedia.

Transposed Excitation
of dipole array
resulted from practical modifications of
Self-complementary antenna.
The antenna shown below is one of the so-called gLog-Periodic Dipole Arrayh or LPDA. However, this is not in the Log-Periodic shape, but it is actually
Modified Self-Complementary Dipole Array (MSCDA) with transposed excitation.
Transposed excitation
for Equally Spaced Modified Self-Complementary Dipole Array, or MSCDA, to obtain unidirectional radiation.


Main radiation

Typical SCA shapes and folding. Modification process of SCA.
(1).Modified Self-Complementary Dipole Array (MSCDA) is
derived from Self-Complementary Antenna (SCA) after some
steps of practical modifications
, and it becomes with
transposed excitation as an .

See: Y. Mushiake, Self-Complementary Antennas,
Springer-Verlag London,
1996, pp. 75-80
.

(2). MSCDA does not have broadband property
unless it has transposed excitation.
This fact is distinct evidence that the Log-Periodic shape
does not provide Dipole Array with broadband property.
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