Patent Application
20240014560
This application claims the benefit of priority to Taiwan Patent Application No. 111125410, filed on Jul. 6, 2022. The entire content of the above identified application is incorporated herein by reference.
The present disclosure relates to an antenna structure, and more particularly, to a small antenna structure.
The development of existing electronic devices like notebook computers, tablets, and mobile phones is in a trend of thin and light with more performance in limited space, and so the research and development of antenna components used in laptop computers is also focused on size reduction and performance enhancement. However, with the manufacturing cost in mind, reducing the size of electronic component may come with degraded performance.
From this, it can be seen that currently the market lacks an antenna structure that is small in size, with enhanced antenna bandwidth, and can be made without raising the manufacturing cost.
It is an object of the present disclosure to provide an antenna structure that includes a substrate, a ground layer, a feeding unit, an antenna unit, and an inductive element. The ground layer is disposed on the substrate. The feeding unit is disposed on the substrate. The antenna unit is disposed on the substrate and connected to the ground layer. The antenna unit and the feeding unit are indirectly connected. One end of the inductive element is electrically connected to the feeding unit, and another end of the inductive element is electrically connected to the antenna unit.
The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:
The present disclosure is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Like numbers in the drawings indicate like components throughout the views. As used in the description herein and throughout the claims that follow, unless the context clearly dictates otherwise, the meaning of “a”, “an”, and “the” includes plural reference, and the meaning of “in” includes “in” and “on”. Titles or subtitles can be used herein for the convenience of a reader, which shall have no influence on the scope of the present disclosure.
The terms used herein generally have their ordinary meanings in the art. In the case of conflict, the present document, including any definitions given herein, will prevail. The same thing can be expressed in more than one way. Alternative language and synonyms can be used for any term(s) discussed herein, and no special significance is to be placed upon whether a term is elaborated or discussed herein. A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms is illustrative only, and in no way limits the scope and meaning of the present disclosure or of any exemplified term. Likewise, the present disclosure is not limited to various embodiments given herein. Numbering terms such as “first”, “second” or “third” can be used to describe various components, signals or the like, which are for distinguishing one component/signal from another one only, and are not intended to, nor should be construed to impose any substantive limitations on the components, signals or the like.
Referring to
More specifically, the substrate 110 has a first surface 111, a second surface 112, and two via holes 113a, 113b, and the first surface 111 and the second surface 112 are on opposite sides of the substrate 110. In this embodiment, the feeding unit 130, the antenna unit 140, and the ground layer 120 are disposed on the first surface 111, and the inductive element 150 is disposed on the second surface 112. The two via holes 113a, 113b penetrate through the substrate 110 along a direction x perpendicular to the first surface 111 and the second surface 112. One via hole 113a electrically connects one end of the inductive element 150 and the feeding unit 130, and the other via hole 113b electrically connects the another end of the inductive element 150 and the antenna unit 140. Thus, by arranging the ground layer 120, the feeding unit 130, the antenna unit 140, and the inductive element 150 on the first surface 111 and the second surface 112 of the substrate 110, where the feeding unit 130 and the antenna unit 140 are on the first surface 111 and the inductive element 150 is on the second surface 112, and with the via holes 113a, 113b acting as means for electrical connections, the antenna structure 100 of the present disclosure utilizes space efficiently so as to reduce the volume/size of the antenna structure 100.
In specific, the inductive element 150 is a coil, and the pattern of the coil can be as illustrated by the inductive element 150 in
Referring to
More particularly, the first band antenna 141 includes a first segment 1411, a second segment 1412, a third segment 1413, a fourth segment 1414, and a fifth segment 1415. The first segment 1411 is disposed along a first direction z, and one end of the first segment 1411 is electrically connected to the inductive element 150. The second segment 1412 is connected to the another end of the first segment 1411 and disposed along a second direction y perpendicular to the first segment 1411. The third segment 1413 is connected to the second segment 1412 and is parallel to the first segment 1411. The fourth segment 1414 is connected to the third segment 1413 and is parallel to the second segment 1412. The fourth segment 1414 is connected to the ground layer 120 through the fifth segment 1415.
The second band antenna 142 includes a first segment 1421, a second segment 1422, and a coupling segment 1423. The first segment 1421 is disposed along the first direction z. The second segment 1422 is connected to the first segment 1421 and disposed along the second direction y perpendicular to the first direction z. The coupling segment 1423 is connected to the first segment 1421 and the ground layer 120, and is parallel to the second segment 1422.
The feeding unit 130 includes a plumb segment 131, a horizontal segment 132, and a third segment 133. The plumb segment 131 is not connected to the ground layer 120. The horizontal segment 132 is connected to the plumb segment 131. A resonance frequency of the feeding unit 130 is 5 GHz. In particular, a feeding point F is used to receive a feeding signal.
When the frequency is high, the inductive element 150 is considered to be in an open circuit mode, where the feeding unit 130 is configured to generate resonance in the 5 GHz frequency band whilst the coupling segment 1423 acts as impedance matching in the 5 GHz frequency band, and the second band antenna 142 is configured to generate resonance in the 2.4 GHz frequency band. When the frequency is low, the inductive element 150 is considered to be in a short circuit mode, where the inductive element 150 and the first band antenna 141 are electrically connected to form a loop structure that generates resonance in the 1.7 GHz frequency band.
Moreover, the antenna unit 140 can further include a patch structure 143. The patch structure 143 is electrically connected to the inductive element 150 and overlaps the inductive element 150 along the direction x. The inductive element 150 overlaps the end of the antenna unit 140 that is away from the ground layer 120. In specific, the end of the first band antenna 141 that is away from the ground layer 120 is overlapped by the inductive element 150. The overlap region of the patch structure 143 and the inductive element 150 and the overlap region of the third segment 133 of the feeding unit 130 and the inductive element 150 act respectively as impedance matching in the 2.1 GHz frequency band and the 4 GHz frequency band. Therefore, by adjusting the location of the inductive element 150 and the size of the patch structure 143, the impedance matching in the 2.1 GHz and 4 GHz frequency bands can be adjusted.
More specifically, a length X1 of the first band antenna 141 along the second direction y is greater than or equal to a length X2 of the second band antenna 142 along the second direction y. There is a gap G1 between the second segment 1412 and the fourth segment 1414 along the first direction z, and the gap G1 is greater than or equal to 2.5 mm and less than or equal to 4.5 mm. The fourth segment 1414 is connected to the ground layer 120 through the fifth segment 1415, and a gap G2 between the fourth segment 1414 and the ground layer 120 along the first direction z is greater than or equal to 0.5 mm and less than or equal to 2 mm. The total length of the first band antenna 141 is greater than or equal to three quarters of the wavelength of the resonance frequency of the first band antenna 141 and less than or equal to the wavelength of the resonance frequency of the first band antenna 141. The fourth segment 1414 does not overlap the inductive element 150 along the direction x perpendicular to the first direction z and the second direction y. In particular, the total length of the first band antenna 141 is the sum of the lengths of all segments in the first band antenna 141, which is approximately two times the sum of the length X1 of the second segment 1412 and the length Y1 of the third segment 1413.
As for the second band antenna 142, the length X2 of the second segment 1422 is greater than a length Y3 of the first segment 1421. The sum of the length Y3 of the first segment 1421 and the length X2 of the second segment 1422 is approximately equal to one quarter of the wavelength of the resonance frequency of the second band antenna 142. There is a gap G3 between the coupling segment 1423 and the feeding unit 130 along the first direction z, and the gap G3 is greater than or equal to 0.5 mm and less than or equal to 2 mm. There is a gap G4 (shown in
As shown in
Referring to
In view of the above, the present disclosure has the following advantages. First, the size of the antenna structure of the present disclosure is reduced by disposing the ground layer, the feeding unit, the antenna unit, and the inductive element on the first surface and the second surface of the substrate, respectively, and using the via holes as electrical connections to efficiently save on the space. Second, the size of the antenna structure is minimized and the circuit components are simplified by replacing the thicker and more complex physical inductor with coil as the inductive element that connects the antenna unit and the feeding unit. Third, the antenna structure of the present disclosure maintains good efficiency performance in the resonance frequency covering from 1.7 GHz to 6 GHz. Fourth, the resonance frequency band range of the antenna structure of the present disclosure is increased without having to expand the size of the antenna structure.
The foregoing description of the exemplary embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching.
The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope.
| Number | Date | Country | Kind |
|---|---|---|---|
| 111125410 | Jul 2022 | TW | national |
