# US 2010/0164831 A1 · Hooked Turnstile Antenna for Navigation and Communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0164831 A1 - Document ID: US20100164831A1 - Status: Published application - Kind: A1 - Application number: 12/392,037 - Filed: 2009-02-24 - Published: 2010-07-01 - Earliest claimed: 2008-12-31 - Assignees: Navcom Technology, Inc. - Inventors: Mark L. Rentz; Liza C. Ma - Web page: https://patentgrep.com/patent/US20100164831A1 ## CPC - H01Q 9/26: with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength (resonant loop antennas H01Q7/00) - H01Q 5/335: at the feed, e.g. for impedance matching - H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength - H01Q 21/24: Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)} - H01Q 21/26: Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna includes a first antenna element and a second antenna element, wherein the first antenna element and the second antenna element are both configured in a hook shape. The antenna also includes a first impedance matching circuit coupled to the first antenna element, wherein the first impedance matching circuit includes a first plurality of filters and a second impedance matching circuit coupled to the second antenna element, wherein the second impedance matching circuit includes a second plurality of filters. ## Claims ### Claim 1 An antenna, comprising: a first antenna element and a second antenna element, wherein the first antenna element and the second antenna element are both configured in a hook shape; a first impedance matching circuit coupled to the first antenna element, wherein the first impedance matching circuit includes a first plurality of filters; and a second impedance matching circuit coupled to the second antenna element, wherein the second impedance matching circuit includes a second plurality of filters. ### Claim 2 (depends on 1) The antenna of claim 1, including: a ground plane; wherein a respective antenna element includes: a first segment substantially perpendicular to the ground plane; a second segment coupled to the first segment and substantially parallel to the ground plane; a third segment coupled to the second segment and substantially perpendicular to the ground plane; and a fourth segment coupled to the third segment and substantially parallel to the ground plane. ### Claim 3 (depends on 1) The antenna of claim 1, wherein a respective impedance matching circuit includes: a low pass filter; and a high pass filter. ### Claim 4 (depends on 3) The antenna of claim 3, wherein the low pass filter and the high pass filter are coupled in series. ### Claim 5 (depends on 3) The antenna of claim 3, wherein the respective impedance matching circuit provides an impedance of substantially 50 Ohms at a center frequency of both a first frequency band and a second, higher frequency band. ### Claim 6 (depends on 1) The antenna of claim 1, including a ground plane; wherein the first antenna element and second antenna element each have a radiating element having a predefined extent parallel to the ground plane; and wherein the hook shape increases the gain of signals received at elevations substantially at the horizon relative to an antenna having inverted-L shaped antenna elements with radiating elements that have the same predefined extent parallel to a ground plane. ### Claim 7 (depends on 1) The antenna of claim 1, including a feed network circuit coupled to the first impedance matching circuit and the second impedance matching circuit, wherein the feed network circuit has a combined output corresponding to the signals received by the first antenna element and the second antenna element. ### Claim 8 (depends on 1) The antenna of claim 1, wherein a respective antenna element includes: an insulating substrate having a specified thickness and a specified dielectric constant; and conducting material on both sides of the insulating substrate. ### Claim 9 (depends on 1) The antenna of claim 1, wherein the first antenna element and the second antenna element are arranged substantially along a first axis of the antenna. ### Claim 10 (depends on 1) The antenna of claim 1, including a third antenna element and a fourth antenna element, wherein the third antenna element and the fourth antenna element are both configured in the hook shape; a third impedance matching circuit coupled to the third antenna element, wherein the third impedance matching circuit includes a third plurality of filters; and a fourth impedance matching circuit coupled to the fourth antenna element, wherein the fourth impedance matching circuit includes a fourth plurality of filters. ### Claim 11 (depends on 10) The antenna of claim 10, wherein the first antenna element and the second antenna element are arranged substantially along a first axis of the antenna; and wherein the third antenna element and the fourth antenna element are arranged substantially along a second axis of the antenna. ### Claim 12 (depends on 11) The antenna of claim 11, wherein the first axis and the second axis are substantially perpendicular to each other. ### Claim 13 (depends on 10) The antenna of claim 10, including a feed network circuit coupled to the first impedance matching circuit, the second impedance matching circuit, the third impedance matching circuit, and the fourth impedance matching circuit, wherein the feed network circuit has a combined output corresponding to the signals received by the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element. ### Claim 14 (depends on 13) The antenna of claim 13, wherein the feed network circuit is configured to phase shift received signals from a respective antenna element relative to received signals from neighboring antenna elements in the antenna by substantially 90 degrees. ### Claim 15 (depends on 10) The antenna of claim 10, wherein the first antenna element, the second antenna element, the third antenna element, and the fourth antenna element are configured to receive radiation that is circularly polarized. ### Claim 16 (depends on 15) The antenna of claim 15, wherein the radiation is right hand circularly polarized radiation. ### Claim 17 A system, comprising: an antenna including a plurality of antenna elements each configured in a hook shape; an impedance matching circuit coupled to the antenna, wherein the impedance matching circuit comprises a plurality of filters; a feed network circuit coupled to the impedance matching circuit; a low-noise amplifier coupled to the feed network circuit; and a sampling circuit coupled to the low-noise amplifier.