Patent Grant
11769947
The present disclosure generally relates to antenna assemblies configured for reception of television signals, such as high definition television (HDTV) signals.
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Many people enjoy watching television. Recently, the television-watching experience has been greatly improved due to high definition television (HDTV). A great number of people pay for HDTV through their existing cable or satellite TV service provider. In fact, many people are unaware that HDTV signals are commonly broadcast over the free public airwaves. This means that HDTV signals may be received for free with the appropriate antenna.
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
Corresponding reference numerals indicate corresponding (although not necessarily identical) parts throughout the several views of the drawings.
The following description is merely exemplary in nature and is in no way intended to limit the present disclosure, application, or uses.
Exemplary embodiments are disclosed of antenna assemblies configured for reception of television signals, such as high definition television (HDTV) signals. In exemplary embodiments, an antenna assembly generally includes a VHF antenna element and a UHF antenna element. The VHF antenna element and the UHF antenna element may be parasitically coupled without a direct ohmic connection between the VHF antenna element and the UHF antenna element. The antenna assembly may be configured to be operable for receiving VHF and UHF high definition television signals without using a diplexer and a VHF balun.
In exemplary embodiments, the VHF antenna element may be a shorted VHF dipole that has been configured (e.g., bent into a shape similar to a U or W, etc.) with extensions along or extending from a top of a middle portion (e.g., a top of the U or W, etc.). The VHF antenna element may be configured (e.g., shaped, sized, located, etc.) so as to achieve desired coupling to the UHF antenna element (e.g., one or more tapered loop antenna elements, etc.), which may be fed by a 75:300 Ohm balun.
The coupling between the VHF and UHF antenna elements may be adjusted by changing the distance between the planes containing each antenna element as well as the distance over which the paths of the VHF and UHF antenna elements overlap each other. The lower cut off frequency of the VHF band may be adjusted by adding or removing material from the part of the VHF antenna element that protrudes outwardly relative to and/or beyond either side of the UHF antenna element. The lower cut off frequency and bandwidth may also be affected and adjusted by changing the separation distance between the VHF and UHF antenna elements.
In exemplary embodiments, the VHF antenna element(s) may comprise one or more rods or tubes. Alternatively, the VHF antenna element(s) may comprise one or more planar elements. In exemplary embodiments that include planar VHF antenna elements, bandwidth may be improved by flaring extensions along or at a top of U-shaped, W-shaped, bent, or curved middle portion of the planar VHF antenna element into a fan or curved fan configuration.
In exemplary embodiments, the VHF antenna element may be placed in front the UHF antenna element. In alternative exemplary embodiments, the VHF antenna element may be placed behind the UHF antenna element. The offset distance between the UHF and VHF antenna elements may range from about 15 millimeters (mm) to about 45 mm depending on desired performance, element shape, and material properties. In exemplary embodiments, the VHF antenna element was placed behind UHF antenna element to allow adjustment to the shape of the VHF antenna element to accommodate housing and mounting hardware with relatively little change in performance.
In exemplary embodiments, the UHF antenna element(s) may include a single tapered loop antenna element, a double tapered loop antenna element (e.g., in a figure eight configuration having a closed shape, etc.), an arrays of single or double tapered loop antenna elements, etc. In exemplary embodiments, the VHF antenna element may include a single antenna element, a double antenna element, etc.
In exemplary embodiments, the antenna assembly may be operable without using or requiring a reflector behind the UHF and VHF antenna elements. In alternative exemplary embodiments, the antenna assembly may include one or more reflectors (e.g., grill or mesh surface, etc.) behind the UHF and VHF antenna elements.
With reference now to the figures,
The VHF antenna element 104 may be configured to be operable for receiving VHF high definition television signals, e.g., from about 174 megahertz to about 216 megahertz, etc. The UHF antenna element 108 may be configured for receiving UHF high definition television signals, e.g., from about 470 megahertz to about 698 megahertz, etc.
The VHF antenna element 104 is parasitically coupled to the UHF antenna element 108 without benefit of direct ohmic contact. The VHF antenna element 104 and UHF antenna element 108 are electromagnetically coupled without a direct ohmic connection between the VHF antenna element 104 and the UHF antenna element 108.
The antenna assembly 100 includes a single feed point on the UHF antenna element 108, e.g., along one of the two generally side-by-side tapered loop antenna elements 112, 116 in a generally figure eight configuration as shown in
As shown in
The VHF antenna element 104 may be formed by configuring (e.g., bending, curving, forming, etc.) a rod or tube 120 so that a curved portion 128 of the VHF antenna element 104 matches or corresponds with a curvature of the curved lower portion of the upper tapered loop antenna element 112 of the UHF antenna element 108. The rod 120 may be wrapped around a housing portion 124 near a feed region of the antenna assembly 100.
Although the VHF antenna element 104 is shown in
In this exemplary embodiment, the VHF antenna element 104 comprises a shorted VHF dipole including a U-shaped, bent, or curved middle portion 128 and first and second straight sections, portions, or extensions 132, 136 extending outwardly from each of the respective first and second sides or ends of the U-shaped middle portion 128. The first and second straight portions 132, 136 extend outwardly beyond the UHF antenna element 108.
In exemplary embodiment, the VHF antenna element 104 may be broken down into two or more pieces for more compact packaging within a box. In which case, a user may relatively easily assemble the VHF antenna element pieces or parts by fastening the pieces/parts together (e.g., with screws, other mechanical fasteners, etc.) and then snapping the assembled VHF pieces/parts into place (e.g., interference or friction fit, etc.) within holders 140 (
The antenna assembly 100 is configured to be operable as a dual band high VHF/UHF antenna. The antenna assembly 100 may be tuned by adjusting the separation distance between the VHF and UHF antenna elements 104, 108, by adjusting the curvature of the VHF antenna element 104 to control the coupling region, and by adjusting the lengths of the straight sections 132, 136 of the VHF antenna element 104 that extend from either side of the U-shaped portion 128 of the VHF antenna element 104.
The parasitic coupling may be adjusted by changing the distance between the planes containing the VHF and UHF antenna elements 104, 108 as well as the distance over which the paths of the VHF and UHF antenna elements 104, 108 overlap each other. The lower cut off frequency of the VHF band may be adjusted by adding or removing material from the part of the VHF antenna element 104 that protrudes outwardly relative to and/or beyond either side of the UHF antenna element 108. The lower cut off frequency and bandwidth may also be affected and adjusted by changing the separation distance between the VHF and UHF antenna elements 104, 108.
A main benefit that may be realized by the antenna assembly 100 is the elimination of a diplexer and VHF balun along with associated cabling and connectors. This also allows for a size reduction of the mounting assembly as well.
The antenna assembly 100 may be used for receiving digital television signals (of which high definition television (HDTV) signals are a subset) and communicating the received signals to an external device, such as a television. A coaxial cable may be used for transmitting signals received by the antenna assembly 100 to the television. The antenna assembly 100 may also be supported by a dielectric stand (e.g., plastic stand 260 shown in
As shown in
In exemplary embodiments, each tapered loop antenna element 112, 116 may have an outer diameter of about two hundred twenty millimeters and an inner diameter of about eighty millimeters. The inner diameter may be offset from the outer diameter such that the center of the circle defined generally by the inner perimeter portion (the inner diameter's midpoint) is about twenty millimeters below the center of the circle defined generally by the outer perimeter portion (the outer diameter's midpoint). Stated differently, the inner diameter may be offset from the outer diameter such that the inner diameter's midpoint is about twenty millimeters below the outer diameter's midpoint. The offsetting of the diameters thus provides a taper to the tapered loop antenna element such that the tapered loop antenna element has at least one portion wider than another portion.
Each tapered loop antenna element 112, 116 includes first and second halves or curved portions that are generally symmetric such that the first half or curved portion is a mirror-image of the second half or curved portion. Each curved portion extends generally between a corresponding end portion and then tapers or gradually increases in width until the middle portion of the tapered loop antenna element 112, 116.
The tapered loop antenna elements 112, 116 may be substantially planar with a generally constant or uniform thickness. In an exemplary embodiment, the tapered loop antenna elements have a thickness of about 3 millimeters. Other embodiments may include a thicker or thinner antenna element.
The UHF antenna element 108 may be housed or enclosed within a housing 124 formed from various materials. In exemplary embodiments, the housing 124 is formed from plastic. In exemplary embodiments in which the antenna assembly 100 is intended for use as an outdoor antenna (e.g.,
As shown in
By way of example, an antenna assembly disclosed herein may be configured to be operable for receiving VHF high definition television signals from about 174 megahertz to about 216 megahertz (e.g., with a voltage standing wave ratio of less than about 3 referenced to a 300 ohm line, etc.) and for receiving UHF high definition television signals from about 470 megahertz to about 698 megahertz (e.g., with a voltage standing wave ratio of less than about 2 referenced to a 300 ohm line, etc.). An antenna assembly disclosed herein may be configured to operate with consistent gain throughout the entire UHF DTV channel spectrum. An antenna assembly disclosed herein may provide great performance regardless of whether it is indoors, outdoors, in an attic, etc. An antenna assembly disclosed herein may have an efficient, compact design that offers excellent gain and impedance matching across the entire post 2009 UHF DTV spectrum and with good directivity at all UHF DTV frequencies.
Alternative embodiments may include one or more UHF antenna elements that are configured differently than the tapered loop antenna elements shown in the figures. For example, other embodiments may include a non-tapered loop UHF antenna element having a centered (not offset) opening. Other embodiments may include a UHF antenna element having an outer periphery/perimeter portion, inner periphery/perimeter portion, and/or opening sized or shaped differently, such as with a non-circular shape (e.g., ovular, triangular, rectangular, etc.). The antenna elements (or any portion thereof) may also be provided in various configurations (e.g., shapes, sizes, etc.) depending at least in part on the intended end-use and signals to be received by the antenna assembly.
The antenna elements disclosed herein may be made from a wide range of materials, which are preferably good conductors (e.g., metals, silver, gold, aluminum, copper, etc.). By way of example only, the tapered loop antenna elements may be formed from a metallic electrical conductor, such as aluminum (e.g., anodized aluminum, etc.), copper, stainless steel, other metals, other alloys, etc.
Exemplary embodiments of antenna assemblies have been disclosed herein as being used for reception of digital television signals, such as HDTV signals. Alternative embodiments, however, may include one or more antenna elements tuned for receiving non-television signals and/or signals having frequencies not associated with HDTV. Thus, embodiments of the present disclosure should not be limited to receiving only television signals having a frequency or within a frequency range associated with digital television or HDTV.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. In addition, advantages and improvements that may be achieved with one or more exemplary embodiments of the present disclosure are provided for purpose of illustration only and do not limit the scope of the present disclosure, as exemplary embodiments disclosed herein may provide all or none of the above mentioned advantages and improvements and still fall within the scope of the present disclosure.
Specific dimensions, specific materials, and/or specific shapes disclosed herein are example in nature and do not limit the scope of the present disclosure. The disclosure herein of particular values and particular ranges of values for given parameters are not exclusive of other values and ranges of values that may be useful in one or more of the examples disclosed herein. Moreover, it is envisioned that any two particular values for a specific parameter stated herein may define the endpoints of a range of values that may be suitable for the given parameter (i.e., the disclosure of a first value and a second value for a given parameter can be interpreted as disclosing that any value between the first and second values could also be employed for the given parameter). For example, if Parameter X is exemplified herein to have value A and also exemplified to have value Z, it is envisioned that parameter X may have a range of values from about A to about Z. Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges. For example, if parameter X is exemplified herein to have values in the range of 1-10, or 3-9, or 3-8, it is also envisioned that Parameter X may have other ranges of values including 1-9, 1-8, 1-3, 1-3, 3-10, 3-8, 3-3, 3-10, and 3-9.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. For example, when permissive phrases, such as “may comprise”, “may include”, and the like, are used herein, at least one antenna assembly comprises or includes the feature(s) in at least one exemplary embodiment. As used herein, the singular forms “a”, “an” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, antenna elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, antenna elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an antenna element or layer is referred to as being “on”, “engaged to”, “connected to” or “coupled to” another antenna element or layer, it may be directly on, engaged, connected or coupled to the other antenna element or layer, or intervening antenna elements or layers may be present. In contrast, when an antenna element is referred to as being “directly on,” “directly engaged to”, “directly connected to” or “directly coupled to” another antenna element or layer, there may be no intervening antenna elements or layers present. Other words used to describe the relationship between antenna elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
The term “about” when applied to values indicates that the calculation or the measurement allows some slight imprecision in the value (with some approach to exactness in the value; approximately or reasonably close to the value; nearly). If, for some reason, the imprecision provided by “about” is not otherwise understood in the art with this ordinary meaning, then “about” as used herein indicates at least variations that may arise from ordinary methods of measuring or using such parameters. For example, the terms “generally”, “about”, and “substantially” may be used herein to mean within manufacturing tolerances.
Although the terms first, second, third, etc. may be used herein to describe various antenna elements, components, regions, layers and/or sections, these antenna elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one antenna element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first antenna element, component, region, layer or section could be termed a second antenna element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one antenna element or feature's relationship to another antenna element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, antenna elements described as “below” or “beneath” other antenna elements or features would then be oriented “above” the other antenna elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual antenna elements, intended or stated uses, or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
This application is a continuation of U.S. patent application Ser. No. 17/202,624 filed Mar. 16, 2021, which published as US2021/0203073 on Jul. 1, 2021. U.S. patent application Ser. No. 17/202,624 is a continuation of U.S. patent application Ser. No. 16/405,835 filed May 7, 2019, which published as US2020/0185832 on Jun. 11, 2020 and issued as U.S. Pat. No. 10,957,979 on Mar. 23, 2021. U.S. patent application Ser. No. 16/405,835 claimed the benefit of and priority to U.S. Provisional Application No. 62/776,344 filed Dec. 6, 2018 and U.S. Provisional Application No. 62/782,273 filed Dec. 19, 2018. The entire disclosures of the above applications are incorporated herein by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20220166143 A1 | May 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62782273 | Dec 2018 | US | |
| 62776344 | Dec 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17202624 | Mar 2021 | US |
| Child | 17667185 | US | |
| Parent | 16405835 | May 2019 | US |
| Child | 17202624 | US |
