Antenna

Details Antenna Antenna

2005-07-19

2005-07-19

Dinh, Trinh Vo (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S860000, C343S853000

Reexamination Certificate

active

06919859

ABSTRACT:
An antenna including a feed network; four or more helical radiating elements, and four or more impedance matching stubs each coupling a respective radiating element to ground in parallel with the feed network. The shunt stubs provide a reactance in parallel with the radiating elements to rotate the desired frequency locus about a constant admittance curve. Specifically, the shunt stubs rotate the desired frequency locus from a low resistance, capacitive impedance to 50 ohms purely resistive. The length of the stubs can be adjusted to control the inductance.

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