The Basic lessons · Feedlines and antenna systems · B-006-013

Loop Antennas: Quads and Delta Loops

This lesson explains how quad and delta loop antennas use full-wavelength wire loops to create directional signals. You will learn how to calculate their size, determine their polarization, and understand their trade-offs compared to other antennas.

This lesson is part of SignalPrep Pro. The subsection's 11 exam questions are free to practise: practise B-006-013.

What this subsection asks

• What is a quad antenna?
• What is a delta loop antenna with parasitic elements?
• What is the approximate length of the driven element of a quad antenna designed for 21.4 MHz?
• What is the approximate length of the driven element of a quad antenna designed for 14.3 MHz?
• What is the approximate length of a delta loop antenna designed for 28.7 MHz?
• What is a major disadvantage of a quad antenna, as compared to a Yagi antenna with the same number of elements and boom length?
• You are constructing an HF delta loop antenna. It is oriented with the bottom element parallel to the ground. Where should you locate the feed point for horizontal polarization?
• Moving the feed point of a quad antenna from a side parallel to the ground to a side perpendicular to the ground will have what effect?
• What is the approximate length of the wire for a horizontal loop tuned at 7.15 MHz?
• The quad antenna consists of two or more square loops of wire. The driven element has an approximate overall length of:
• What is the approximate overall length of a delta loop antenna?