Planar monopole loop composite multi-frequency broadband antenna
By designing a planar monopole loop composite multi-frequency broadband antenna, and adopting a coplanar waveguide structure with an asymmetric T-shaped signal line and a multi-turn grounding loop, the problems of large size and insufficient bandwidth of wireless antennas in mobile electronic devices are solved, and broadband multi-frequency performance and stable radiation are achieved in a limited space.
Patent Information
- Application Number
- CN202423284509.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing mobile electronic devices typically have large wireless antennas, making it difficult to implement multi-frequency and wideband designs within a limited space, which affects circuit layout and makes it difficult to meet bandwidth requirements.
Design a planar monopole loop composite multi-frequency broadband antenna. It adopts an asymmetric T-shaped signal line and a multi-turn loop ground line to form a coplanar waveguide feed structure. Combined with a planar printed circuit board or a three-dimensional antenna cut by metal wire, it achieves broadband multi-frequency performance.
It achieves good antenna radiation performance in a limited space, with a wide frequency range from MHz to mmWave, conforms to Wi-Fi 6E or Wi-Fi 7 specifications, and has a good radiation pattern and low reflection loss.
Smart Images
Figure CN223797542U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a planar monopole loop composite multi-frequency broadband antenna, in particular to a miniaturized multi-frequency and broadband antenna, a composite antenna system with balanced antenna performance, which has an omnidirectional antenna radiation field pattern under the condition that the space where the antenna can be arranged is limited, and can overcome the influence of the radiation performance and frequency bandwidth of the antenna when the area of the receiving region changes. BACKGROUND
[0002] Wireless communication technology is an indispensable part of modern social life. With the comprehensive layout of wired and wireless local area networks, mobile electronic devices must be equipped with wireless antennas for signal reception and transmission. Mobile electronic devices can use the Internet and transmit data through wireless local area networks (WLAN).
[0003] The wireless antenna of the above-mentioned mobile electronic device usually belongs to a single entity or is integrated with other different function antennas. The volume is usually large and affects the circuit layout of the mobile electronic device. On the other hand, the operating frequency bandwidth of the wireless antenna requires design towards multi-frequency and broadband frequency bands. Under the premise of not occupying too much space inside the mobile electronic device, how to provide a more ideal multi-frequency and broadband antenna becomes the goal of those engaged in this industry. SUMMARY
[0004] Therefore, in view of the above problems and deficiencies, the purpose of the utility model is to provide a planar monopole loop composite multi-frequency broadband antenna.
[0005] The utility model provides a planar monopole loop composite multi-frequency broadband antenna, which comprises a carrier, a signal line in the form of an asymmetric T-shaped and formed on the carrier, the signal line comprising a high-frequency radiation part, and a first signal line extending in the high-frequency radiation part is coupled to a receiving area and forms a feed-in point for welding a predetermined cable at the coupling position; a loop grounding wire is formed on the carrier and forms a multi-turn low / middle-frequency radiation part around the signal line, the low / middle-frequency radiation part comprises an outer loop conduction path and an inner loop conduction path extending inwardly on one side of the outer loop conduction path, the second signal line and the third signal line at both ends of the outer loop conduction path are coupled to the receiving area, and the loop grounding wire surrounds the signal line to form a monopole antenna with coplanar waveguide feed-in and has the characteristics of a dipole antenna.
[0006] Through the above, a simple antenna architecture and good performance can be achieved. The antenna can be materialized using various methods such as planar printed circuit boards, plastic sheets, or three-dimensional antennas formed by wire cutting. Furthermore, the antenna has a single feed structure with a coplanar waveguide, and the ground wire is designed as a loop type, surrounding the monopole type signal line to achieve wideband and multi-frequency performance. In addition, by easily forming various antenna structures, it is possible to achieve good antenna radiation performance even when the space where the antenna can be set is limited. Moreover, the applicable frequency range is extremely wide, from the MHz level to the mmWave (millimeter wave) level.
[0007] Preferably, the top side of the high-frequency radiating portion of the signal line has a top loading portion that allows for adjustable impedance matching and bandwidth of the high-frequency resonant band, and the top loading portion has a rectangular structure.
[0008] Preferably, the first signal line of the signal line extends vertically with an open-circuit cutoff line that allows for adjustable impedance matching and bandwidth of the high-frequency resonant band.
[0009] Preferably, the inner circuit conduction path of the grounding wire of the circuit has an adjustment area for impedance matching and frequency band width that can be adjusted for the low-frequency resonant frequency band, and the adjustment area has a rectangular structure.
[0010] Preferably, the low-frequency signal conduction path of the grounding wire of the circuit is completed in the following order: via the second signal line, the outer circuit conduction path which is approximately U-shaped, the inner circuit conduction path which is approximately inverted C-shaped, and the third signal line.
[0011] Preferably, the intermediate frequency signal transmission path of the grounding wire of the loop is completed in the order of the second signal line, the outer loop transmission path which is approximately "U" shaped, and the third signal line. Radiation transmission points are formed at the two junctions of the outer loop transmission path and the inner loop transmission path. The signal is transmitted through the two radiation transmission points using wireless signal hopping points to form electronic signal transmission in the outer loop transmission path that does not pass through the inner loop transmission path.
[0012] Preferably, the signal line is formed in the space formed between the lines on both sides of the outer loop conduction path and below the inner loop conduction path, and the first signal line, the second signal line and the third signal line are coupled with the grounding area to form a coplanar waveguide feed, wherein the first signal line forms a live wire and the second signal line and the third signal line form a ground wire. Attached Figure Description
[0013] Figure 1 This is a diagram illustrating an embodiment of the antenna of this utility model.
[0014] Figure 2This is a schematic diagram of the high-frequency signal transmission path of this utility model.
[0015] Figure 3 This is a schematic diagram of the medium / low frequency signal transmission path of this utility model.
[0016] Figure 4 This is the impedance matching diagram of the antenna of this utility model.
[0017] Figure 5 This is a diagram showing the antenna current distribution and radiation field pattern of this invention in the 2.45GHz frequency band.
[0018] Figure 6 This is a diagram showing the antenna current distribution and radiation field pattern of this invention in the 5.5GHz frequency band.
[0019] Figure 7 This is a diagram showing the antenna current distribution and radiation field pattern of this invention in the 6.5GHz frequency band.
[0020] Explanation of reference numerals in the attached drawings: 1-Carrier; 2-Signal line; 21-High-frequency radiating part; 211-Top loading part; 22-First signal line; 221-Open circuit cut-off line; 3-Grounding area; 31-Feed-in point; 4-Loop grounding wire; 41-Low / medium frequency radiating part; 411-Outer loop conduction path; 412-Inner loop conduction path; 4121-Adjustment area; 42-Second signal line; 43-Third signal line; 44-Radiation conduction point; A-High-frequency signal conduction path; B-Low-frequency signal conduction path; C-Medium-frequency signal conduction path. Detailed Implementation
[0021] To achieve the above objectives and effects, the technical means and structure adopted by this utility model are described in detail below with reference to the preferred embodiment of this utility model, so as to facilitate a complete understanding.
[0022] Please see Figures 1-3 The figures shown are, respectively, an embodiment diagram of the antenna of this utility model, a schematic diagram of the high-frequency signal transmission path, and a schematic diagram of the medium / low-frequency signal transmission path. As can be clearly seen from the figures, the fixing device of this utility model mainly includes a carrier 1, a signal line 2, a grounding area 3, and a return grounding wire 4. Its main components and features are detailed below:
[0023] The carrier 1 refers to a planar printed circuit board (PCB), a plastic board, or a three-dimensional metal antenna formed by wire cutting. The carrier 1 is attached to a wireless electronic device (e.g., a wireless network card with an external USB interface [Wi-Fi USB dongle]), but it is not limited to this. Any wireless electronic device that uses a Wi-Fi wireless interface is an embodiment of this utility model.
[0024] The signal line 2 is in an asymmetrical T-shape and is formed on the carrier 1. The signal line 2 includes a high-frequency radiating part 21 and a first signal line 22 extending from the high-frequency radiating part 21 is coupled to a junction area 3 and a feed point 31 is formed at the coupling point for soldering a preset cable (not shown in the figure).
[0025] The loop grounding wire 4 is formed on the carrier 1 and forms a low / intermediate frequency radiating part 41 with multiple bends around the signal line 2. The low / intermediate frequency radiating part 41 includes an outer loop conduction path 411 and an inner loop conduction path 412 that bends inward on one side of the outer loop conduction path 411. The second signal line 42 and the third signal line 43 at both ends of the outer loop conduction path 411 are coupled to the grounding area 3. The loop grounding wire 4 surrounds the signal line 2 to form a coplanar waveguide feeding-point monopole antenna with dipole antenna characteristics.
[0026] like Figure 2 As shown, the high-frequency radiating portion 21 of the signal line 2 has a top-loading portion 211 on its top side, which allows for adjustable impedance matching and bandwidth of the high-frequency resonant band, and the top-loading portion 211 has a narrow rectangular structure; while the first signal line 22 of the signal line 2 extends vertically with an open-circuit cut-off line 221, which allows for adjustable impedance matching and bandwidth of the high-frequency resonant band. The high-frequency signal transmission path A is via the first signal line 22 to the high-frequency radiating portion 21.
[0027] The inner circuit conduction path 412 of the aforementioned grounding wire 4 has an adjustment area 4121 that can adjust the impedance matching and bandwidth of the low-frequency resonant band, and the adjustment area 4121 has a rectangular structure.
[0028] Please see Figure 1 , Figure 3 As shown, the low-frequency signal conduction path B of the loop grounding wire 4 completes low-frequency signal conduction in the following order: the second signal line 42, the outer loop conduction path 411 (approximately U-shaped), the inner loop conduction path 412 (approximately inverted C-shaped), and the third signal line 43. The intermediate-frequency signal conduction path C of the loop grounding wire 4 completes intermediate-frequency signal conduction in the following order: the second signal line 42, the outer loop conduction path 411 (approximately U-shaped), and the third signal line 43. Radiation conduction points 44 are formed at both intersections of the outer loop conduction path 411 and the inner loop conduction path 412. Wireless signal hopping is achieved through these two radiation conduction points 44, allowing the outer loop conduction path 411 to transmit electronic signals without passing through the inner loop conduction path 412.
[0029] The aforementioned signal line 2 is formed in the space surrounded by the lines on both sides of the outer loop conduction path 411 and below the inner loop conduction path 412. The coupling points of the first signal line 22, the second signal line 42, and the third signal line 43 with the grounding area 3 form a coplanar waveguide feed, wherein the first signal line 22 forms a live wire, and the second signal line 42 and the third signal line 43 form a non-live ground wire. The aforementioned antenna signal feed structure employs a symmetrical (or asymmetrical) coplanar waveguide feed method. At the signal input end of the antenna, the loop grounding wire 4 surrounds the signal line 2, thereby increasing the antenna's operating bandwidth.
[0030] The length of the aforementioned signal line 2 is one-quarter wavelength (λ / 4) of the center frequency of the high-frequency band; while the length of the circuit grounding line 4 is one-quarter wavelength (λ / 4) of the center frequency of the low-frequency band.
[0031] The low-frequency operating band of the aforementioned planar monopole loop composite multi-frequency broadband antenna is 2.4–2.5 GHz; the medium-frequency operating band is 5.15–5.85 GHz; and the high-frequency operating band is 5.925–7.125 GHz.
[0032] Please see Figure 4 The diagram shows the impedance matching of the antenna of this invention. In the Wi-Fi signal frequency bands (2.4GHz~2.5GHz, 5.15~7.12GHz), the return loss is below -10dB, which meets the antenna impedance matching characteristics. This proves that it can be applied to Wi-Fi 6E or Wi-Fi 7 wireless electronic devices without causing the problem of return loss (signal being reflected back to the signal source).
[0033] Please refer to Table 1, which shows the 3D radiation efficiency of the antenna of this utility model.
[0034] Table 1
[0035]
[0036] Table 1 above shows the measured values of the antenna of this utility model. It can be seen that within the usable frequency bands of Wi-Fi signals (2.4GHz~2.5GHz, 5.15~7.12GHz), its peak gain ranges from 2.79 to 6.07 dBi, and its efficiency ranges from 48% to 88%, proving... Figure 1 The provided antenna design fully complies with Wi-Fi 6E or Wi-Fi 7 specifications and has good performance.
[0037] Please see again Figures 5-7The figures shown are the antenna current distribution and radiation field patterns of this invention in the 2.45GHz, 5.5GHz, and 6.5GHz frequency bands, respectively. Figure 5 This is a representative diagram of the low-frequency operating band; Figure 6 This is a representative diagram of the intermediate frequency operating band; Figure 7 This is a representative diagram for the intermediate frequency (IF) operating band. The loop ground wire 4 of this invention surrounds the signal line 2 to form a coplanar waveguide feeding-point (CPW) monopole antenna, thus exhibiting dipole antenna characteristics. The upper diagram representing the dipole antenna characteristics shows the power intensity (dB) of electromagnetic wave radiation in the XY-axis plane at an angle of 0° to 360°; the middle diagram shows the power intensity (dB) of electromagnetic wave radiation in the YZ-axis plane at an angle of 0° to 360°; and the lower diagram shows the power intensity (dB) of electromagnetic wave radiation in the ZX-axis plane at an angle of 0° to 360°. The power intensities in the XY-axis, YZ-axis, and ZX-axis planes can all be converted into 3D stereographic figures (not shown in the diagram), and these 3D stereographic figures closely resemble a sphere, indicating that the electromagnetic wave signal of this invention's antenna is extremely stable and without any missing corners (missing corners represent areas where electromagnetic waves cannot radiate, i.e., areas with poor electromagnetic wave signal). Figures 5-7 Overall, the test results show that this invention has good antenna radiation patterns in all operating frequency bands: 2.4–2.5 GHz (low frequency band), 5.15–5.85 GHz (mid frequency band), and 5.925–7.125 GHz (high frequency band).
[0038] The planar monopole loop composite multi-frequency broadband antenna of this invention has the following advantages:
[0039] (1) It can achieve a simple antenna architecture and good performance. The antenna can be materialized using various methods such as planar printed circuit boards, plastic boards or three-dimensional antennas formed by metal wire cutting.
[0040] (2) The antenna has a single feed structure with a coplanar waveguide and the ground wire is designed as a loop to surround the signal line of the single pole type in order to achieve wideband and multi-frequency performance.
[0041] (3) By easily forming a variety of antenna structures, it is possible to achieve good antenna radiation performance even when the space where the antenna can be set is limited.
[0042] (4) It has an extremely wide range of applicable frequencies, from MHz to mmWave.
[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Therefore, any simple modifications and equivalent structural changes made based on the description and drawings of the present utility model should also be included within the protection scope of the present utility model and are hereby stated.
[0044] In summary, the planar monopole loop composite multi-frequency broadband antenna described above is a highly practical invention that can effectively achieve its function and purpose in use.
Claims
1. A planar monopole loop composite multi-frequency broadband antenna, characterized in that, include: One carrier; A signal line, which is asymmetrically T-shaped and formed on the carrier, includes a high-frequency radiating part and a first signal line extending from the high-frequency radiating part is coupled to a junction area and a feed point for pre-set cable soldering is formed at the coupling point. as well as A grounding wire is formed on the carrier and forms a low / intermediate frequency radiating section with multiple bends around the signal line. The low / intermediate frequency radiating section includes an outer loop conduction path and an inner loop conduction path that bends inward on one side of the outer loop conduction path. The second and third signal lines at both ends of the outer loop conduction path are coupled to the grounding area. The grounding wire surrounds the signal line to form a monopole antenna fed by a coplanar waveguide and has the characteristics of a dipole antenna.
2. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The carrier refers to a flat printed circuit board, a plastic board, or a three-dimensional metal antenna.
3. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The high-frequency radiating part of the signal line has a top loading part on its top side that can adjust the impedance matching and bandwidth of the high-frequency resonant band, and the top loading part has a narrow rectangular structure.
4. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The first signal line of the signal line extends vertically and has an open-circuit cutoff line that can adjust the impedance matching and bandwidth of the high-frequency resonant band.
5. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The inner circuit conduction path of the grounding wire has an adjustment area that can adjust the impedance matching and bandwidth of the low-frequency resonant band, and the adjustment area has a rectangular structure.
6. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The low-frequency signal conduction path of the grounding wire of the circuit is completed in the following order: via the second signal line, the outer circuit conduction path in the shape of a "U", the inner circuit conduction path in the shape of an inverted "C", and the third signal line.
7. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The intermediate frequency signal transmission path of the grounding wire of the loop is completed in the order of the second signal line, the outer loop transmission path in the shape of "U" and the third signal line. Radiation transmission points are formed at the two junctions of the outer loop transmission path and the inner loop transmission path. The electronic signal transmission is formed by wireless signal hopping through the two radiation transmission points so that the outer loop transmission path does not pass through the inner loop transmission path.
8. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The signal line is formed in the space formed between the lines on both sides of the outer loop conduction path and below the inner loop conduction path, and the first signal line, the second signal line and the third signal line are coupled with the grounding area to form a coplanar waveguide feed, wherein the first signal line forms a live wire and the second signal line and the third signal line form a ground wire.
9. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The length of the signal line is one-quarter of the wavelength of the center frequency of the high-frequency band; while the length of the grounding wire of the loop is one-quarter of the wavelength of the center frequency of the low-frequency band.
10. The planar monopole loop composite multi-frequency broadband antenna as described in claim 1, characterized in that, The planar monopole loop composite multi-frequency broadband antenna operates in the low-frequency band of 2.4–2.5 GHz, the intermediate-frequency band of 5.15–5.85 GHz, and the high-frequency band of 5.925–7.125 GHz.