# US 11,309,630 B2 · Antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,630 B2 - Document ID: US11309630B2 - Status: Granted - Kind: B2 - Application number: 16/500,016 - Filed: 2018-03-21 - Published: 2020-04-16 - Granted: 2022-04-19 - Earliest claimed: 2017-05-30 - Assignees: Licensys Australasia Pty Ltd - Applicants: Licensys Australasia Pty Ltd - Inventors: Albertus Jacobus Pretorius; Abraham Gert Willem Du Plooy; Ahmed Toaha Mobashsher; Konstanty Stanislaw Bialkowski - Web page: https://patentgrep.com/patent/US11309630B2 ## CPC - H01Q 1/3225: {Cooperation with the rails or the road} - H01Q 9/0414: {in a stacked or folded configuration} - H01Q 1/2216: {used in interrogator/reader equipment} - H01Q 1/3233: {particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems} - H01Q 1/42: Housings not intimately mechanically associated with radiating elements, e.g. radome - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)} - H01Q 9/18: Vertical disposition of the antenna - H01Q 13/18: the slot being backed by, or formed in boundary wall of, a resonant cavity (longitudinally slotted cylinder H01Q13/12 ){; Open cavity antennas} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna for a communication device is disclosed. The antenna has a structure including a ground plane and a lid component. The lid component is conductive, substantially planar and has a planform shape which is lesser in a first lid component dimension (L1) than it is in a second lid component dimension (L2) perpendicular to the first lid component dimension (L1). The ground plane is conductive and substantially planar, and the size of the ground plane is greater than the size of the lid component. The lid component is conductively connected to the ground plane but also spaced apart from the ground plane, such that there is a space between the lid component and the ground plane, and the antenna is center fed. ## Claims ### Claim 1 An antenna for a communication device, the antenna having a structure including a ground plane and a lid component, wherein: the lid component is conductive, substantially planar and has a planform shape which is lesser in a first lid component dimension (L1) than in a second lid component dimension (L2) perpendicular to the first lid component dimension (L1), the ground plane is conductive, substantially planar and has a planform shape which has a first ground plane dimension (G1) and a second ground plane dimension (G2), where the first and second ground plane dimensions (G1 and G2) are parallel to the first and second lid component dimensions (L1 and L2) respectively, the size of the ground plane in the first ground plane dimension (G1) is greater than the size of the lid component in the first lid component dimension (L1) and the size of the ground plane in the second ground plane dimension (G2) is greater than the size of lid component in the second lid component dimension (L2), and the lid component is conductively connected to the ground plane but also spaced apart from the ground plane such that there is a space between the lid component and the ground plane, and the antenna is center fed, wherein energy/radiation radiated/emitted by the antenna emanates from between the ground plane and edge(s) of the lid component that extend in the direction of the second lid component dimension (L2) and wherein no energy/radiation is radiated/emitted from between the ground plane and edge(s) of lid component that extend in the direction of the first lid component dimension (L1). ### Claim 2 An antenna for a communication device, the antenna having a structure including a ground plane and a lid component, wherein: the lid component is conductive, substantially planar and has a planform shape which is lesser in a first lid component dimension (L1) than in a second lid component dimension (L2) perpendicular to the first lid component dimension (L1), the ground plane is conductive and substantially planar, the size of the ground plane is greater than the size of the lid component; the lid component is conductively connected to the ground plane but also spaced apart from the ground plane, such that there is a space between the lid component and the ground plane, and the antenna is center fed, wherein energy/radiation radiated/emitted by the antenna emanates from between the ground plane and edge(s) of the lid component that extend in the direction of the second lid component dimension (L2) and wherein no energy/radiation is radiated/emitted from between the ground plane and edge(s) of lid component that extend in the direction of the first lid component dimension (L1). ### Claim 3 (depends on 1) The antenna as claimed in claim 1, wherein the lid component is spaced apart from but also parallel to the ground plane. ### Claim 4 (depends on 1) The antenna according to claim 1, wherein energy/radiation radiated/emitted by the antenna emanates from between the lid component and the ground plane. ### Claim 5 (depends on 1) The antenna according to claim 1, wherein the communication device is an RFID reader operable to be used in an application involving road vehicle detection and/or identification, and wherein, of the parts and components of the RFID reader, at least the antenna's ground plane is operable to be installed on the surface of the road. ### Claim 6 (depends on 1) The antenna according to claim 1, wherein the lid component is substantially rectangular with dimensions L1×L2, energy/radiation radiated/emitted by the antenna emanates from between the ground plane and the long edges of the substantially rectangular lid component that extend in the direction of the second lid component dimension (L2), and no energy/radiation is radiated/emitted from between the ground plane and the short edges of the substantially rectangular lid component that extend in the direction of the first lid component dimension (L1). ### Claim 7 (depends on 1) The antenna according to claim 1, wherein the planform shape of the lid component is lesser in the first lid component dimension (L1) than in the second lid component dimension (L2) by a factor f, where 0.3≤f≤0.75. ### Claim 8 (depends on 1) The antenna according to claim 1, wherein the second lid component dimension (L2) is approximately half the antenna's operating signal wavelength (A) plus or minus a matching factor (x) of up to 20%, the antenna's operating signal is about 800 MHz to 1 GHz in frequency and in the direction of the second lid component dimension (L2) the lid component extends for between approximately 90 mm and approximately 260 mm. ### Claim 9 (depends on 1) The antenna according to claim 1, wherein the lid component is supported at a location spaced apart from the ground plane by one or more conductive support members, the distance that the lid component is spaced apart from the ground plane is defined by the length of the support members, the distance with which the support member(s) support the lid component apart from the ground plane is approximately the antenna's operating signal wavelength (λ) divided by a factor h, where 10≤h≤35. ### Claim 10 (depends on 1) The antenna according to claim 1, wherein the ground plane includes a base plate, and the lid component is spaced apart from but also parallel to the base plate, such that the space between the lid component and the ground plane is the space between the lid component and the base plate, both of the lid component and the base plate are formed from a substantially rigid and conductive material, wherein the base plate is substantially planar and with a plan form shape that is larger than that of the lid component but smaller than that of the ground plane. ### Claim 11 (depends on 1) The antenna according to claim 1, wherein a filler or supporting material is provided in the space between the ground plane and the lid component. ### Claim 12 (depends on 1) The antenna according to claim 1 further including a protective cover. ### Claim 13 (depends on 12) The antenna as claimed in claim 12, wherein the protective cover is in contact with the ground plane and extends over the lid component in order to protect the lid component. ### Claim 14 (depends on 13) The antenna as claimed in claim 13, wherein the protective cover is in contact with the ground plane all the way around the lid component, and the lid component and the space between the ground plane and the lid component are enclosed within the ground plane and the protective cover. ### Claim 15 (depends on 12) The antenna according to claim 12, wherein the protective cover functions as a radome. ### Claim 16 (depends on 12) The antenna according to claim 12, wherein the protective cover is operable to assist the ground plane to lower a radiation pattern of the antenna. ### Claim 17 (depends on 12) The antenna according to claim 12, wherein the protective cover has one or more edges, which extend from the ground plane to the level of the lid component, and the one or more edges thereof have at least a portion which is sloping to assist in reducing impact or shock to a vehicle tire or the like that contacts or rolls over the protective cover or a portion of the protective cover. ### Claim 18 (depends on 17) The antenna as claimed in claim 17, wherein the one or more edges of the protective cover are straight along their length. ### Claim 19 (depends on 1) An RFID reader incorporating or operable to be used with an antenna as claimed in claim 1. ### Claim 20 (depends on 1) The antenna according to claim 1, wherein the lid component is spaced apart from the ground plane thereby forming a cavity between the lid component and the ground plane. ### Claim 21 (depends on 2) The antenna according to claim 2, wherein the lid component is spaced apart from the ground plane thereby forming a cavity between the lid component and the ground plane.