Patent Application
20200403318
The subject matter herein generally relates to antennas.
A typical triangular planar inverted-F antenna commonly includes a metal radiating sheet. An embedded slot is defined in the radiating sheet to form two arms, forming resonant paths of different lengths. In addition, a width of a short-circuiting metal patch of the antenna can be changed to adjust an operating frequency of the antenna, exciting a first resonant mode (TM10) and a second resonant mode (TM20). However, the first resonant mode (TM10) and the second resonant mode (TM20) have similar broadside radiation patterns. Therefore, the application of the triangular planar inverted-F antenna is relatively simple.
There is room for improvement within the art.
Implementations of the present disclosure will now be described, by way of embodiment, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details and features of the present disclosure.
Several definitions that apply throughout this disclosure will now be presented.
The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.
The present disclosure is described in relation to an antenna structure and an intelligent household applianceusing the same.
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In this embodiment, the second patch 20 is substantially an isosceles trapezoidal patch having an embedded V-shaped slot. The second patch 20 includes a first bottom edge 21, a second bottom edge 22, a first side edge 23, and a second side edge 24. The first bottom edge 21 and the second bottom edge 22 are parallel to and spaced from each other. The first side edge 23 and the second side edge 24 are connected to the first bottom edge 21 and the second bottom edge 22. A first shorting wall A and a second shorting wall B are formed between the first patch 10 and the second patch 20. In this embodiment, the first shorting wall A and the second shorting wall B are metal patches.
A substantially V-shaped slot 25 is defined in the second patch 20. The slot 25 includes a first section 251 and a second section 252. The first section 251 intersects with a second section 252 to form an angle C therebetween. The first section 251 is parallel to and spaced from the first side edge 23. The second section 252 is parallel to and spaced from the second side edge 24. A length of the first section 251 is the same as that of the second section 252. The first section 251 and the second section 252 are symmetrically positioned relative to a central line (Y-axis) of the second patch 20.
In this embodiment, the second patch 20 is formed by placing the second shorting wall B into an equilateral triangular metal patch. The second connection end 42 is connected to a center of the equilateral triangle.
Referring to
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The patch surface current I1 mainly flows along the V-shaped slot 25. The patch surface current I2 mainly flows along the triangle. The current distributions of these modes at a truncated portion of the triangle (where the second shorting wall B is positioned) is zero. When the second shorting wall B is added to the antenna structure 100, the current at the truncated portion of the triangle will no longer be zero. In this way, the first resonance mode (TM10) and the second resonance mode (TM20) can be suppressed. A portion of the surface excitation current I3 flows along an inner side of the groove 25 toward the first short-circuit body A, and the other portion of the surface excitation current I3 flows along an outer side of the groove 25 toward the second short-circuit body B. The surface excitation current I4 mainly flows along edge of the triangle toward two bottom corners of the triangle and the second shorting wall B.
In a second embodiment of the present disclosure, the widths of the second shorting wall B can be gradually increased, for example, s=3 mm or 7 mm, and at this time, the resonant frequency and the matching impedance of the first resonant mode (TM11) are slightly changed, and the antenna structure 100 will operate in a third resonant mode (M3). The resonant frequency of the third resonant mode (M3) can be gradually shifted toward a high frequency direction (as shown in
Referring to
Referring to
The antenna structure 100 of the present disclosure achieves dual frequency operations by placing a second shorting wall B into the triangular PIFA antenna structure with the V-shaped slot. Thus, the antenna structure 100 can be excited in the first resonant mode (TM11) and the second resonant mode (TM21) having different radiation patterns. The antenna structure 100 can have multiple functions in practical applications, for example, indoor or short-range communication, or wireless mobile communication in surface system base station communications.
In addition, the first resonant mode (TM11) and third resonant mode (M3) can have similar radiation characteristics when the width s of the second shorting wall B is adjusted. Meanwhile, a position of the V-shaped slot can be adjusted to bring the resonant frequency of the third resonant mode (M3) close to the resonant frequency of the first resonant mode (TM11). Broadband operation with a bandwidth of up to 25% can thus be achieved.
Furthermore, the height of the antenna structure is less than 0.06λ0, and the operating bandwidth of the antenna structure can cover the frequency bands of 3G and WLAN (1920 MHz-2483 MHz). Therefore, the antenna structure can be applied in an intelligent household appliance.
The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of the antenna structure and the intelligent household appliance. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the details, especially in matters of shape, size, and arrangement of the parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.
