WIFI double-frequency microstrip antenna

Abstract

The utility model discloses a WIFI double-frequency microstrip antenna, which comprises a dielectric substrate with a first surface and a second surface which are opposite to each other, a feed branch knot and a grounding branch knot, the feed branch knot realizes the generation of 2.4 GHz resonance, the feed branch knot is coupled with the grounding branch knot, a first gap is arranged between the feed branch knot and the grounding branch knot, and a second gap is arranged between the feed branch knot and the grounding branch knot. The antenna comprises a dielectric substrate, a feed branch knot and a grounding branch knot, the feed branch knot and the grounding branch knot are arranged on a first surface of the dielectric substrate, the feed branch knot is provided with a first feed point so as to facilitate signal transmission, the grounding branch knot is provided with a first grounding point and a second grounding point, and the first grounding point is provided with a second feed point so as to facilitate signal transmission. Therefore, two orthogonal polarized waves are formed, and dual polarization is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a WIFI dual-band microstrip antenna. Background Art

[0002] With the increasing development of communication technology, wireless routers are more and more widely used in our lives and have become an essential network connection device in every household. A wireless router needs to work within a certain frequency range to communicate with other devices, and it uses a free public frequency band. Other electronic products such as air conditioners and Bluetooth headsets also use this frequency band, which will cause wireless signal interference between devices and lead to unstable network.

[0003] The dipole antenna in the prior art consists of a pair of symmetrically placed conductors. The two ends of the conductors close to each other are respectively connected to the feed line. When used as a transmitting antenna, the electrical signal is fed into the conductor from the center of the antenna. When used as a receiving antenna, the received signal is also obtained from the conductor at the center of the antenna. By optimizing the antenna structure and parameters, the dipole antenna can improve the signal transmission efficiency and coverage. These characteristics provide a longer communication distance and better performance than a monopole antenna. However, it is difficult for the dipole antenna to cover the dual band of WIFI, and it has a large size and poor anti-interference ability.

[0004] Therefore, how to achieve multi-band coverage of WIFI with a single antenna has become the focus of attention in this field and related personnel. Summary of the Utility Model

[0005] In view of this, the utility model provides a WIFI dual-band microstrip antenna to solve the problem that the dipole antenna in the prior art is difficult to cover the dual band of WIFI.

[0006] To achieve one or part or all of the above purposes or other purposes, the utility model provides a WIFI dual-band microstrip antenna, which includes a dielectric substrate having opposite first and second surfaces, a feeding branch and a grounding branch. The feeding branch is coupled with the grounding branch, and there is a first gap between the feeding branch and the grounding branch. The feeding branch and the grounding branch are both arranged on the first surface of the dielectric substrate. A first feeding point is arranged on the feeding branch, and a first grounding point and a second grounding point are arranged on the grounding branch.

[0007] Preferably, the WIFI dual-band microstrip antenna further includes a reverse antenna branch, which is arranged on the second surface of the dielectric substrate, and the reverse antenna branch is coupled with the feeding branch and the grounding branch.

[0008] Preferably, a second feeding point, a third grounding point and a fourth grounding point are arranged on the reverse antenna branch.

[0009] Preferably, the grounding stub includes a first stub and a second stub extending from the first stub. The second stub is coupled to the feeding stub, and the first slot is located between the second stub and the feeding stub.

[0010] Preferably, the feeding stub includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion is recessed to form a first gap. The second stub is located within the first gap. The second stub is coupled to the first connecting portion, and the first slot is located between the second stub and the first connecting portion.

[0011] Preferably, the WIFI dual-band microstrip antenna further includes a five-claw SMA connector and a coaxial cable. One end of the five-claw SMA connector is connected to the reverse antenna stub, passes through the reverse antenna stub, and is connected to the feeding stub and the grounding stub. The other end of the five-claw SMA connector is connected to the coaxial cable. The five-claw SMA connector is used to realize signal transmission between the feeding stub, the grounding stub, the reverse antenna stub, and the coaxial cable.

[0012] Preferably, the five-claw SMA connector includes a core, a first pin, a second pin, and a third pin. The first pin, the second pin, and the third pin are all disposed on the core. The first pin is welded to the first feeding point and the second feeding point. The second pin is welded to the third grounding point, passes through the third grounding point, and is welded to the first grounding point. The third pin is welded to the fourth grounding point, passes through the fourth grounding point, and is welded to the second grounding point.

[0013] Preferably, the five-claw SMA connector further includes a plurality of fourth pins. A plurality of vias are provided on the reverse antenna stub. Each fourth pin passes through a corresponding via and is connected to the dielectric substrate.

[0014] Preferably, the number of the fourth pins and the vias is both two.

[0015] Preferably, the feeding stub excites a 2.4 GHz resonance, a 5.8 GHz resonance is excited at the first slot, and the feeding stub and the reverse antenna stub excite a 5.8 GHz resonance.

[0016] Implementing the embodiments of the present invention will have the following beneficial effects:

[0017] After adopting the above WIFI dual-band microstrip antenna, a first feed point is provided on the feed point stub to facilitate signal transmission. A first ground point and a second ground point are provided on the ground stub to form two orthogonal polarization waves, thereby achieving dual polarization. The feed stub generates resonance at 2.4 GHz. The ground stub is coupled with the feed stub and has a first slot. The resonance of WIFI 5.8 GHz is excited at the first slot, thereby achieving support for wireless signals in two different frequency bands. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Wherein:

[0020] Figure 1 It is a schematic diagram of the overall structure of the WIFI dual-band microstrip antenna in an embodiment;

[0021] Figure 2 It is an exploded view of the WIFI dual-band microstrip antenna in an embodiment;

[0022] Figure 3 It is a schematic diagram of a partial structure of the WIFI dual-band microstrip antenna in an embodiment;

[0023] Figure 4 It is a front view of the WIFI dual-band microstrip antenna in an embodiment;

[0024] Figure 5 It is a back view of the WIFI dual-band microstrip antenna in an embodiment;

[0025] Figure 6 It is a graph of the antenna efficiency of the WIFI dual-band microstrip antenna in an embodiment;

[0026] Figure 7 It is a graph of the return loss of the WIFI dual-band microstrip antenna in an embodiment.

[0027] Description of reference numerals: 1, dielectric substrate; 2, feeding stub; 21, first feeding point; 22, first connecting portion; 23, second connecting portion; 24, first gap; 3, grounding stub; 31, first grounding point; 32, second grounding point; 33, first stub; 34, second stub; 4, reverse antenna stub; 41, second feeding point; 42, third grounding point; 43, fourth grounding point; 44, via hole; 5, first slot; 6, five-claw SMA connector; 61, inner core; 62, first pin; 63, second pin; 64, third pin; 65, fourth pin; 7, coaxial cable. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Refer to Figures 1 to 5 , an embodiment of the present invention provides a WIFI dual-band microstrip antenna, including a dielectric substrate 1, a feeding stub 2, a grounding stub 3, a reverse antenna stub 4, a five-claw SMA connector 6 and a coaxial cable 7. The dielectric substrate 1 has a relative first surface and a second surface. The feeding stub 2 and the grounding stub 3 are both disposed on the first surface of the dielectric substrate 1. The feeding stub 2 is coupled with the grounding stub 3. The reverse antenna stub 4 is disposed on the second surface of the dielectric substrate 1. The reverse antenna stub 4 is coupled with the feeding stub 2 and the grounding stub 3 to excite a 5.8 GHz resonance. One end of the five-claw SMA connector 6 is welded to the reverse antenna stub 4 and passes through the reverse antenna stub 4 to be welded to the feeding stub 2 and the grounding stub 3. The other end of the five-claw SMA connector 6 is connected to the coaxial cable 7. The coaxial cable 7 is used to transmit high-frequency signals and provides signal protection and anti-interference capabilities.

[0030] Refer to Figure 2 and Figure 3 , the grounding stub 3 includes a first stub 33 and a second stub 34 extending from the first stub 33. The feeding stub 2 includes a first connecting portion 22 and a second connecting portion 23 connected to each other. The first connecting portion 22 is recessed to form a first gap 24. The second stub 34 is located in the first gap 24. The second stub 34 is coupled with the first connecting portion 22, and there is a first slot 5 between the second stub 34 and the first connecting portion 22. The resonance of WIFI 5.8 GHz is excited at the first slot 5.

[0031] Refer to Figure 3, the five - claw SMA connector 6 includes a core 61, a first pin 62, a second pin 63, and a third pin 64. The first pin 62, the second pin 63, and the third pin 64 are all connected to the core 61. There is a first feed point 21 on the feed stub 2, and a second feed point 41 on the reverse antenna stub 4. The first pin 62 is welded to the first feed point 21 and the second feed point 41. There is a first ground point 31 and a second ground point 32 on the ground stub 3, and a third ground point 42 and a fourth ground point 43 on the reverse antenna stub 4. The second pin 63 is welded to the third ground point 42 and passes through the third ground point 42 to be welded to the first ground point 31. The third pin 64 is welded to the fourth ground point 43 and passes through the fourth ground point 43 to be welded to the second ground point 32, thereby realizing the signal transmission between the feed stub 2, the ground stub 3, the reverse antenna stub 4 and the coaxial cable 7. By respectively setting the first ground point 31 and the second ground point 32 on the ground stub 3, and the third ground point 42 and the fourth ground point 43 on the reverse antenna stub 4, two orthogonal polarization waves are formed, thereby realizing dual - polarization.

[0032] Refer to Figure 3 , the five - claw SMA connector 6 further includes a plurality of fourth pins 65. There are a plurality of vias 44 on the reverse antenna stub 4. One end of each of the plurality of fourth pins 65 is connected to the core 61, and the other end of each fourth pin 65 passes through the corresponding via 44 to be connected to the dielectric substrate 1, thereby strengthening the connection between the coaxial cable 7 and the dielectric substrate 1. Among them, the number of the fourth pins 65 and the vias 44 is two.

[0033] Refer to Figure 4 and Figure 5 , the feed stub 2 realizes the generation of 2.4GHz resonance. The ground stub 3 is coupled with the feed stub 2, and excites the resonance of WIFI 5.8GHz at the first slot 5. The reverse antenna stub 4 is coupled with the ground stub 3 and the feed stub 2, and excites the resonance of 5.8GHz, which not only broadens the bandwidth of WIFI 5.8GHz, but also enhances the anti - interference ability of the WIFI signal, playing a role in strengthening the structure.

[0034] Refer to Figure 6 , Figure 6 is the antenna efficiency curve graph of the WIFI dual - band microstrip antenna provided by the embodiment of the present application. It can be seen that within the frequency bands of 2.4GHz - 2.5GHz and 5.15GHz - 5.85GHz, the antenna structure has an average efficiency of more than 80%.

[0035] Refer to Figure 7 , Figure 7It is the echo loss curve diagram of the WIFI dual-band microstrip antenna provided by the embodiment of the present application. It can be seen that within the frequency band of 2.4 GHz to 2.5 GHz, the average echo loss of the antenna structure is -0.81 dB, and within the frequency band of 5.15 GHz to 5.85 GHz, the average echo loss of the antenna structure is -0.79 dB, meeting the design requirements of the WIFI antenna frequency band.

[0036] The above-disclosed are only the preferred embodiments of the present invention, and of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A WIFI dual-band microstrip antenna, characterized in that: The invention comprises a dielectric substrate (1) having a first surface and a second surface opposite to each other, a feeding branch (2) and a grounding branch (3); the feeding branch (2) is coupled to the grounding branch (3); a first gap (5) is provided between the feeding branch (2) and the grounding branch (3); the feeding branch (2) and the grounding branch (3) are both arranged on the first surface of the dielectric substrate (1); a first feeding point (21) is provided on the feeding branch (2); and a first grounding point (31) and a second grounding point (32) are provided on the grounding branch (3).

2. A WIFI dual-band microstrip antenna as claimed in claim 1, characterized in that: The WIFI dual-band microstrip antenna also includes a reverse antenna branch (4), wherein the reverse antenna branch (4) is arranged on the second surface of the dielectric substrate (1), and the reverse antenna branch (4) is coupled with the feed branch (2) and the ground branch (3).

3. A WIFI dual-band microstrip antenna as claimed in claim 2, characterized in that: The reverse antenna branch (4) is provided with a second feeding point (41), a third grounding point (42) and a fourth grounding point (43).

4. A WIFI dual-band microstrip antenna as claimed in claim 3, characterized in that: The grounding branch (3) comprises a first branch (33) and a second branch (34) extending from the first branch (33), the second branch (34) is coupled with the feeding branch (2), and the first gap (5) is located between the second branch (34) and the feeding branch (2).

5. A WIFI dual-band microstrip antenna as claimed in claim 4, characterized in that: The feeding branch (2) comprises a first connecting portion (22) and a second connecting portion (23) which are connected to each other, the first connecting portion (22) is recessed to form a first gap (24), the second branch (34) is located in the first gap (24), the second branch (34) is coupled to the first connecting portion (22), and the first gap (5) is located between the second branch (34) and the first connecting portion (22).

6. A WIFI dual-band microstrip antenna as claimed in claim 5, characterized in that: The WIFI dual-band microstrip antenna further comprises a five-prong SMA connector (6) and a coaxial cable (7); one end of the five-prong SMA connector (6) is connected to the back antenna branch (4), and passes through the back antenna branch (4) to be connected to the feeding branch (2) and the grounding branch (3); the other end of the five-prong SMA connector (6) is connected to the coaxial cable (7); the five-prong SMA connector (6) is used to realize signal transmission between the feeding branch (2), the grounding branch (3), the back antenna branch (4) and the coaxial cable (7).

7. A WIFI dual-band microstrip antenna as claimed in claim 6, characterized in that: The five-prong SMA connector (6) comprises an inner core (61), a first pin (62), a second pin (63) and a third pin (64); the first pin (62), the second pin (63) and the third pin (64) are all arranged on the inner core (61); the first pin (62) is welded to the first feeding point (21) and the second feeding point (41); the second pin (63) is welded to the third grounding point (42) and passes through the third grounding point (42) to be welded to the first grounding point (31); the third pin (64) is welded to the fourth grounding point (43) and passes through the fourth grounding point (43) to be welded to the second grounding point (32).

8. A WIFI dual-band microstrip antenna as claimed in claim 6, characterized in that: The five-prong SMA connector (6) further comprises a plurality of fourth pins (65), a plurality of via holes (44) are provided on the reverse antenna branch (4), and each of the fourth pins (65) passes through a corresponding via hole (44) to be connected to the dielectric substrate (1).

9. A WIFI dual-band microstrip antenna as claimed in claim 8, characterized in that: The number of the fourth pin (65) and the number of the via hole (44) are both two.

10. A WIFI dual-band microstrip antenna as claimed in claim 2, characterized in that: The feeding branch (2) excites a 2.4 GHz resonance, the first slot (5) excites a 5.8 GHz resonance, and the feeding branch (2) and the reverse antenna branch (4) excite a 5.8 GHz resonance.

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