FLAT HELICAL ANTENNA Russian patent published in 2015 - IPC H01Q11/08 

FIELD: radio engineering, communication.

SUBSTANCE: in an antenna, having a resonator and a radiator, which is in the form of a flat two-turn helix, which is rigidly attached to the aperture plane of the resonator and is connected to a feeder, the outer winding of the flat two-turn helix is in the form of a delay line by endowing the outer turn with a zigzag shape with uniform arrangement of zigzag protrusions along the middle line of the outer winding and connecting capacitors between the zigzag protrusions, wherein the height H of the zigzag protrusions relative to their width h is limited by the relationship H<7h, and the capacitance of the capacitors is selected based on the condition $$C=\frac{h}{L_{\max }}{\left(L_{mid}{f}_{\min }\right)}^{-2},$$ where L_mid is the length of the outer winding at its middle line, f_min is the minimum operating frequency of the antenna, L_max is the inductance of the zigzag protrusion of the maximum height.

EFFECT: expanding the operating frequency band of the antenna towards low frequencies.

3 cl, 2 dwg