Taut-Wire Log Periodic Arrays
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Antenna Models by KY8D

Saw Tooth Arrays

Three points worth pondering:

A SETI Institute engineers chose saw tooth LPAs for an upgrade to each of the 42 dishes in their Allen Telescope Array;
B Engineers the world over (citing budget concerns) have decided upon trapezoidal LPAs for the 100-plus dish SKA project;
C Nowhere, it seems, do radio-telescope engineers choose a dipole LPA for the all-important sensor element of a radio-telescope.

Whatever the advantages up in the GHz range, ought those not to scale (down in f, up in size) similarly for use at HF? It's a question, anyhow, itching away in the back of my mind. Worth spending a little computer time on, at the very least.

Preliminary Miscellania

• LPA Questions Sawteeth perhaps unfairly tainted?
• Tooth Structure Slight deviation from the 1966 patent.
• Leading Half-Angle Alternative param for sigma?

Experimental Iterations

• Boom Tilt Why slope an LPA's boom toward ground?
• Boom Length Longer is better. But where do the returns diminish?
• Boom Spacing How much effect on Z_in, and thence SWR?
• Boom Vee Splaying the booms for more gain. Even a bi-directional LPA maybe?
• Element Count More are better. But when to stop adding?
• Element Droop Exchange some gain to mitigate fading?

Single Designs

• LPSA 2020-08-13 18-30MHz, 17 elements, 25 meters long