Broadband helical antenna with cutoff pattern
AssigneeTopcon Positioning Systems, Inc.
InventorsAnton Pavlovich Stepanenko, Andrey Vitalievich Astakhov, Dmitry Vitalievich Tatarnikov, Ivan Miroslavovich Chernetskiy
Life of this patent
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Abstract
A broadband quadruple helical circularly-polarized antenna for receiving GNSS signals comprises an excitation circuit and a set of quadruple spiral elements. Each quadruple spiral element consists of four conductors. Each conductor is a one spiral turn of the quadruple spiral element. Said conductors have equal winding angle. The winding angle of all conductors does not change in the same quadruple spiral element. Conductors of neighboring (longitudinally) quadruple spiral elements have different winding angles. The antenna provides a sharp drop in AP at angles near the horizon and a small AP level in the lower hemisphere.
Claims11
An antenna for receiving circularly polarized signals, the antenna comprising:
- a hollow dielectric cylinder oriented along a vertical axis;
- four spiral conducting elements wrapped around the cylinder;
- the four spiral conducting elements divided into at least three longitudinal sections,
- wherein the conducting elements in each section have a constant winding angle around the cylinder,
- wherein the winding angle of all of the conducting elements in the same longitudinal section is the same, and
- wherein neighboring longitudinal sections have different winding angles relative to each other;
- and
- an excitation circuit connected to the conducting elements,
- wherein the antenna provides a down/up ratio
- DU
-
- (
- θ
- )
- =
- F
-
- (
- -
- 10
-
- °
- )
- F
-
- (
- 10
-
- °
- )
- of at least −15 dB in a frequency range from 1164-1610 MHz, where F(−10°) is a gain of the antenna at −10° elevation, and F(10°) is a gain of the antenna at +10° elevation.
An antenna comprising:
- a dielectric cylinder having a longitudinal axis;
- four spiral conductors wrapped around the cylinder;
- the four spiral conductors divided into at least three longitudinal sections,
- wherein the conductors in each section have a constant winding angle around the cylinder,
- wherein the winding angle of all of the conductors in the same longitudinal section is the same, and
- wherein neighboring longitudinal sections have different winding angles relative to each other;
- and
- an excitation circuit connected to the conductors,
- wherein the antenna provides a down/up ratio
- DU
-
- (
- θ
- )
- =
- F
-
- (
- -
- 10
-
- °
- )
- F
-
- (
- 10
-
- °
- )
- at least −15 dB, where F(−10°) is a gain of the antenna at −10° elevation, and F(10°) is a gain of the antenna at +10° elevation.
An antenna comprising:
- a dielectric cylinder having a longitudinal axis;
- at least three spiral conductors wrapped around the cylinder;
- the at least three spiral conductors divided into top and bottom longitudinal sections,
- wherein the spiral conductors in each section have a constant winding angle around the cylinder,
- wherein a winding angle of all of the conductors in the same longitudinal section is the same, and
- wherein a winding angle of the top longitudinal section is different from a winding angle of the bottom longitudinal section;
- a central conducting portion connecting the top and bottom longitudinal sections,
- wherein conductors in the central conducting portion are arranged circularly around the dielectric cylinder;
- and
- an excitation circuit connected to the conductors,
- wherein the antenna provides a down/up ratio
- DU
-
- (
- θ
- )
- =
- F
-
- (
- -
- 10
-
- °
- )
- F
-
- (
- 10
-
- °
- )
- of at least −15 dB, where F(−10°) is a gain of the antenna at −10° elevation, and F(10°) is a gain of the antenna at +10° elevation.
Dependencies are inferred from the claim text.