Miniaturized high gain gps dipole antenna

Abstract

The utility model discloses a miniaturization high gain GPS dipole antenna, including flexible circuit board, and flexible circuit board has the two antenna traces of mirror image symmetry setting, the antenna trace includes the first branch, second branch, third branch, fourth branch and fifth branch that vertical connection in proper order, the one end of fifth branch far away fourth branch stretches into the interstice between first branch and third branch, the one end of first branch far away second branch in one antenna trace is the feed point, and the one end of first branch far away second branch in another antenna trace is the feed point. This GPS dipole antenna gives consideration to four big needs of size miniaturization, gain not drop, cost not increase, environmental adaptability enhancement.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a miniaturized high-gain GPS dipole antenna. Background Technology

[0002] The Global Positioning System (GPS) is widely used in various fields of modern society, from consumer electronics such as smartphones and car navigation systems to professional fields such as aviation, navigation, and surveying, all of which rely on GPS to obtain accurate location, speed, and time information. With the continuous expansion of related application scenarios, the demand for GPS antennas is increasing, and higher requirements are being placed on their performance and size.

[0003] In the development of GPS technology, miniaturization has become a significant trend. Many electronic devices are pursuing lightness and portability, and the internal space is becoming more and more compact, leaving very limited space for antennas. This urgently requires the development of GPS antennas that are small in size but can maintain good performance in order to meet the design requirements of device miniaturization. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a miniaturized high-gain GPS dipole antenna.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a miniaturized high-gain GPS dipole antenna, including a flexible circuit board, the flexible circuit board having two antenna traces arranged in a mirror symmetrical manner, the antenna traces including a first stub, a second stub, a third stub, a fourth stub and a fifth stub connected vertically in sequence, the end of the fifth stub away from the fourth stub extending into the gap between the first stub and the third stub; one of the antenna traces, the end of the first stub away from the second stub is the feed point, and the other of the antenna traces, the end of the first stub away from the second stub is the feed point.

[0006] In one embodiment, the connection between the second branch and the third branch is offset from the end of the third branch.

[0007] In one embodiment, the connection between the fifth branch and the fourth branch is offset from the end of the fourth branch.

[0008] In one embodiment, the flexible circuit board includes a rectangular flexible substrate, the antenna trace is disposed on the flexible substrate, and the third and fourth branches are respectively disposed along the edges of the flexible substrate.

[0009] In one embodiment, the power supply point and the power supply location are positioned close to each other.

[0010] In one embodiment, the first branch, the second branch, the third branch, the fourth branch, and the fifth branch are each in a straight line.

[0011] In one embodiment, the length of the third branch is greater than the length of the fifth branch, the length of the fifth branch is greater than the length of the first branch, the length of the first branch is greater than the length of the second branch, and the length of the second branch is greater than the length of the fourth branch.

[0012] In one embodiment, the first branch, the second branch, the third branch, and the fourth branch have the same width, and the fifth branch has a width greater than the first branch.

[0013] The advantages of this invention are as follows: Compared to traditional GPS antennas that require a physical length of λ / 2 to excite L1 resonance, resulting in a large overall thickness and inability to adapt to narrow slots or curved surfaces, this antenna, while retaining the high-gain mechanism of dipole "current standing wave, bidirectional radiation," achieves three-dimensional bending solely through mirror-symmetric dual traces on a flexible circuit board: the first to fifth branches are connected vertically in sequence, and the fifth branch folds back into the gap between the first and third branches, causing the originally linear current path to be continuously folded into a three-dimensional loop; the equivalent electrical length is compressed to a physical length significantly smaller than half the traditional wavelength, yet it still achieves GPS... A complete half-wave resonance is formed in the L1 band, which significantly reduces the antenna area and thickness to the thickness of the flexible circuit board itself. It can be directly conformally attached to narrow curved surfaces or internal supports without the need for additional supports or cables. The flexible substrate also gives the antenna the ability to be rolled up, bent, and withstand high and low temperatures and vibration, meeting the stringent requirements of wearable, vehicle-mounted, and drone conformal applications. The mirror-symmetric power-to-ground structure maintains a balanced port, suppresses common-mode current in the coaxial feed line, and ensures low-elevation satellite signal reception, truly meeting the four major requirements of miniaturization, no gain reduction, no increase in cost, and enhanced environmental adaptability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a top view of the miniaturized high-gain GPS dipole antenna of Embodiment 1;

[0016] Figure 2 The return loss curve of the miniaturized high-gain GPS dipole antenna in Example 1 is shown.

[0017] Figure 3 The antenna gain curve of the miniaturized high-gain GPS dipole antenna in Example 1 is shown.

[0018] Figure 4 The image shows the antenna efficiency curve of the miniaturized high-gain GPS dipole antenna in Example 1.

[0019] Figure 5 The image shows the 2D radiation pattern of the miniaturized high-gain GPS dipole antenna in the XY plane according to Embodiment 1.

[0020] Figure 6 The image shows the 2D radiation pattern of the miniaturized high-gain GPS dipole antenna in the XZ plane according to Example 1.

[0021] Figure 7 The image shows the 2D radiation pattern of the miniaturized high-gain GPS dipole antenna in the YZ plane according to Example 1.

[0022] Figure 8 This is the 3D radiation pattern of the miniaturized high-gain GPS dipole antenna in Example 1.

[0023] Explanation of icon numbers:

[0024] 1. Flexible circuit board;

[0025] 2. Antenna routing; 21. First stub; 22. Second stub; 23. Third stub; 24. Fourth stub; 25. Fifth stub;

[0026] 3. Power supply point;

[0027] 4. Feedback location;

[0028] 5. Flexible substrate. Detailed Implementation

[0029] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0033] Furthermore, if the word "and / or" appears throughout the text, it means that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Example 1

[0036] Please refer to Figures 1 to 8 Embodiment 1 of this utility model is as follows: Figure 1 As shown, a miniaturized high-gain GPS dipole antenna includes a flexible circuit board 1. The flexible circuit board 1 has two antenna traces 2 arranged in a mirror-symmetrical manner. The two antenna traces 2 jointly generate GPS L1 resonance. The antenna traces 2 include a first stub 21, a second stub 22, a third stub 23, a fourth stub 24, and a fifth stub 25 connected vertically in sequence. The end of the fifth stub 25 away from the fourth stub 24 extends into the gap between the first stub 21 and the third stub 23. The end of the first stub 21 away from the second stub 22 in one antenna trace 2 is a feed point 3, and the end of the first stub 21 away from the second stub 22 in the other antenna trace 2 is a feed point 4. The feed point 3 and the feed point 4 are arranged close to each other. The core wire of the external radio frequency line is soldered to the feed point 3 for conduction, and the mesh wire of the external radio frequency line is soldered to the feed point 4 for conduction.

[0037] The connection point between the second branch 22 and the third branch 23 is offset from the end of the third branch 23, and the connection point between the second branch 22 and the third branch 23 is offset from the midpoint of the third branch 23.

[0038] The connection point between the fifth branch 25 and the fourth branch 24 is offset from the end of the fourth branch 24. In this embodiment, the connection point between the fifth branch 25 and the fourth branch 24 is located near the midpoint of the fourth branch 24.

[0039] In the specific product, the flexible circuit board 1 includes a rectangular flexible substrate 5, the antenna trace 2 is disposed on the flexible substrate 5, and the third branch 23 and the fourth branch 24 are respectively disposed along the edge of the flexible substrate 5. In this embodiment, the flexible substrate 5 has a length and width of 18mm and a thickness of 0.2mm.

[0040] In one or more embodiments, the first branch 21, the second branch 22, the third branch 23, the fourth branch 24, and the fifth branch 25 are each in a straight line.

[0041] In this embodiment, the length of the third branch 23 is greater than the length of the fifth branch 25, the length of the fifth branch 25 is greater than the length of the first branch 21, the length of the first branch 21 is greater than the length of the second branch 22, and the length of the second branch 22 is greater than the length of the fourth branch 24; the widths of the first branch 21, the second branch 22, the third branch 23, and the fourth branch 24 are equal, and the width of the fifth branch 25 is greater than the width of the first branch 21.

[0042] Figure 2 The return loss curve of the miniaturized high-gain GPS dipole antenna of this embodiment is shown. Figure 2 As can be seen, the miniaturized high-gain GPS dipole antenna of this embodiment has an S11 better than -19dB in the 1.559–1.606GHz navigation band, with the lowest point close to -26dB, indicating good port matching and high energy radiation efficiency.

[0043] Figure 3 The antenna gain curve of the miniaturized high-gain GPS dipole antenna of this embodiment is shown. Figure 3 As can be seen, the miniaturized high-gain GPS dipole antenna of this embodiment maintains a gain stable between 1.1 and 1.7 dBi within the operating frequency band, with a fluctuation of only about 0.6 dB, indicating that its radiation efficiency and directional stability are consistent. Figure 1 Good compatibility;

[0044] Figure 4 The diagram shows the antenna efficiency curve of the miniaturized high-gain GPS dipole antenna of this embodiment. Figure 4As can be seen, the miniaturized high-gain GPS dipole antenna of this embodiment maintains a radiation efficiency of over 50% throughout the entire target frequency band, with a peak value close to 58%. The curve is flat and without obvious dips, indicating that both ohmic loss and surface wave loss are well controlled. The antenna efficiency curve and gain curve show the same trend, further verifying its suitability for portable GNSS terminal applications with dual constraints on power consumption and receiver sensitivity.

[0045] Figure 5 The 2D radiation pattern of the miniaturized high-gain GPS dipole antenna of this embodiment in the XY plane is shown. Figure 6 The 2D radiation pattern of the miniaturized high-gain GPS dipole antenna of this embodiment in the XZ plane is shown. Figure 7 The 2D radiation pattern of the miniaturized high-gain GPS dipole antenna of this embodiment in the YZ plane is shown. Figure 8 The 3D radiation pattern of the miniaturized high-gain GPS dipole antenna of this embodiment is shown. From the 2D diagrams of the XY, ZX, and ZY sections, it can be seen that the antenna exhibits a quasi-omnidirectional radiation pattern on the plate (XY), with fluctuations of only ±2dB, indicating no severe eccentricity in the zenith direction (+Z). The ZX and ZY sections show a +Z axis peak value of 1.3–1.4dBi, a 3dB beamwidth >120°, and a gain drop of less than 3dB within a low elevation angle of 30°, ensuring stable reception of GNSS satellites from the horizon to overhead. The back lobe equalization voltage is below -9dBi, and the front-to-back ratio is better than 10dB, indicating effective floor size and edge current suppression, and good multipath suppression capability. The 3D diagram further confirms that the radiator is a regular "apple" shape, without lobes or deep nulls, exhibiting excellent rotational symmetry, high polarization purity, and high phase center stability, making it suitable for scenarios with random attitude changes, such as handheld, wearable, or vehicle-mounted applications, and beneficial for positioning accuracy in urban canyon environments.

[0046] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the contents of this utility model specification and drawings under the utility model concept, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A miniaturized high-gain GPS dipole antenna, characterized in that: The device includes a flexible circuit board with two antenna traces arranged in a mirror-symmetrical configuration. The antenna traces include a first stub, a second stub, a third stub, a fourth stub, and a fifth stub that are connected vertically in sequence. The end of the fifth stub furthest from the fourth stub extends into the gap between the first and third stubs. In one antenna trace, the end of the first stub furthest from the second stub is a feed point, and in the other antenna trace, the end of the first stub furthest from the second stub is a feed point.

2. The miniaturized high-gain GPS dipole antenna according to claim 1, characterized in that: The connection between the second and third branches is offset from the end of the third branch.

3. The miniaturized high-gain GPS dipole antenna according to claim 1, characterized in that: The connection point between the fifth branch and the fourth branch is offset from the end of the fourth branch.

4. A miniaturized high-gain GPS dipole antenna according to claim 1, characterized in that: The flexible circuit board includes a rectangular flexible substrate, the antenna trace is disposed on the flexible substrate, and the third and fourth branches are respectively disposed along the edge of the flexible substrate.

5. A miniaturized high-gain GPS dipole antenna according to claim 1, characterized in that: The power supply point and the power supply location are set close to each other.

6. A miniaturized high-gain GPS dipole antenna according to claim 1, characterized in that: The first, second, third, fourth, and fifth branches are all in a straight line.

7. A miniaturized high-gain GPS dipole antenna according to claim 6, characterized in that: The length of the third branch is greater than the length of the fifth branch, the length of the fifth branch is greater than the length of the first branch, the length of the first branch is greater than the length of the second branch, and the length of the second branch is greater than the length of the fourth branch.

8. A miniaturized high-gain GPS dipole antenna according to claim 6, characterized in that: The first, second, third, and fourth branches have the same width, while the fifth branch has a wider width than the first branch.

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