CN105552536A - Monopole dual-band WLAN/WiMAX antenna - Google Patents

Abstract

The invention discloses a monopole dual-band WLAN/WiMAX antenna, which comprises a dielectric substrate, a microstrip structure and a metal floor, wherein the microstrip structure is located on the upper surface of the dielectric substrate; the metal floor is located on the lower surface of the dielectric substrate; the microstrip structure comprises a microstrip feeder, a first radiation section and a second radiation section; the first radiation section is connected with the microstrip feeder; and the second radiation section is connected with the first radiation section. The monopole dual-band WLAN/WiMAX antenna is compact in structure, can be designed into a small size and has good radiation characteristic. The antenna is resonated at different frequencies through different resonant elements, so that miniaturization and dual-band of the WLAN/WIMAX antenna are achieved; and the monopole dual-band WLAN/WiMAX antenna is suitable for WLAN2.45GHz and WIMAX3.5GHz.

Description

A Monopole Dual-Band WLAN/WiMAX Antenna

technical field

The invention relates to the field of small microstrip antennas, in particular to a monopole dual-band WLAN/WiMAX antenna.

Background technique

At present, with the rapid development of modern wireless communication technology, Wireless Local Area Networks (Wireless Local Area Networks, WLAN) and Worldwide Interoperability Microwave Access (WiMAX) are widely used. WLAN uses wireless communication technology to transmit data in the air, so that users can exchange information at any time. WiMAX is an emerging broadband wireless access technology, which can provide high-speed Internet-oriented connections, and the data transmission distance can reach up to 50km, which can meet the needs of high-speed mobile users. As an important part of the wireless communication system, the performance of the antenna will have a significant impact on the communication. At present, the main working frequency of WLAN is 2.4GHz (2.4-2.484GHz), 5.2GHz (5.15-5.35GHz), 5.8GHz (5.725-5.825GHz). As for WIMAX, there is currently no unified frequency division standard in various countries, and the current frequency division is mainly concentrated in 2.5GHz (2.5-2.69GHz), 3.5GHz (3.4-3.7GHz), 5.5GHz (5.25-5.85GHz) and other frequency bands. With the widespread application of WLAN and WiMAX technologies in the field of wireless communication, miniaturized multi-band microstrip antennas for WLAN/WiMAX have become one of the research hotspots in the field of antennas.

With the rapid development of integrated circuits, system equipment continues to develop in the direction of multi-functional integration, miniaturization, modularization, and intelligence. As a terminal component of a wireless communication system, modern electronic products put forward higher performance requirements for antennas: broadband, multi-band, small, easy to manufacture, etc. This requirement also promotes the development of antennas in the direction of miniaturization and multi-band. Due to the wide application of wireless communication, spectrum resources are becoming more and more scarce, so it is of great significance to design miniaturized, low-cost, dual-band or multi-band WLAN/WiMAX antennas. When designing multi-band antennas, microstrip antennas are widely used because of their simple structure, easy fabrication, low cost, and easy integration with microwave circuits. At present, the work of realizing multi-frequency and miniaturization of microstrip antenna mainly includes the following methods: (1) Using multi-layer overlapping patch technology, using two patch stacking methods to form two resonators corresponding to different resonance frequencies for dual-frequency Radiation, but the structure is more complicated; (2) Slots are made on the antenna radiation patch, but it will change the original current path and affect the radiation characteristics of the antenna; (3) Combine two narrowband resonant units into a dual-frequency antenna unit, However, this increases the size of the antenna.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a monopole dual-band WLAN/WiMAX antenna, which aims to solve the existing problems of complex structure, large size, and affected performance.

Technical scheme of the present invention is as follows:

A monopole dual-band WLAN/WiMAX antenna, which includes a dielectric substrate, a microstrip structure located on the upper surface of the dielectric substrate, and a metal floor located on the lower surface of the dielectric substrate; the microstrip structure includes a microstrip feeder, and the The first radiating section connected to the microstrip feeder, and the second radiating section connected to the first radiating section.

In the monopole dual-band WLAN/WiMAX antenna, the first radiating section has a rectangular ring structure.

In the monopole dual-band WLAN/WiMAX antenna, the second radiating section is an L-shaped structure.

In the monopole dual-band WLAN/WiMAX antenna, the microstrip feeder is also connected to a bent first radiating metal strip.

In the monopole dual-band WLAN/WiMAX antenna, a second radiating metal strip connected to the microstrip feeder is further arranged between the microstrip feeder and the first radiating metal strip.

In the monopole dual-band WLAN/WiMAX antenna, the second radiating metal strip is a bent structure.

In the monopole dual-band WLAN/WiMAX antenna, the second radiating section is within the first radiating section.

In the monopole dual-band WLAN/WiMAX antenna, the dielectric substrate is an FR4 substrate.

Beneficial effects: the monopole dual-band WLAN/WiMAX antenna of the present invention has a compact structure, can be designed into a small size, and has good radiation characteristics. The antenna resonates at different frequencies through different resonant units, which realizes the miniaturization and dual-band of the WLAN/WIMAX antenna, and is suitable for WLAN2.45GHz and WIMAX3.5GHz.

Description of drawings

FIG. 1 is a schematic structural diagram of a monopole dual-band WLAN/WiMAX antenna according to the present invention at a first viewing angle.

FIG. 2 is a schematic structural diagram of a monopole dual-band WLAN/WiMAX antenna according to the present invention at a second viewing angle.

FIG. 3 is a return loss curve diagram of a monopole dual-band WLAN/WiMAX antenna according to the present invention.

FIG. 4 is a directivity diagram of a monopole dual-band WLAN/WiMAX antenna of the present invention at 2.45 GHz on plane E and plane H. FIG.

FIG. 5 is a directivity diagram of E plane and H plane at 3.5 GHz of a monopole dual-band WLAN/WiMAX antenna according to the present invention.

detailed description

The present invention provides a monopole dual-band WLAN/WiMAX antenna. In order to make the purpose, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1 and FIG. 1 and FIG. 2 are structural schematic diagrams of different viewing angles of a preferred embodiment of a monopole dual-band WLAN/WiMAX antenna according to the present invention. As shown in the figure, it includes a dielectric substrate 1, a 1 a microstrip structure on the upper surface, a metal floor (ground part) located on the lower surface of the dielectric substrate 1; the microstrip structure includes a microstrip feeder 2, a first radiation section 3 connected to the microstrip feeder 2, and The first radiating section 3 is connected to the second radiating section 4 . The monopole dual-band WLAN/WiMAX antenna of the present invention has a compact structure, can be designed into a small size, and has good radiation characteristics. The antenna resonates at different frequencies through different resonant units, namely WLAN2.45GHz and WIMAX3.5GHz. The resonant frequency of the antenna can be changed by changing the size of the resonant unit. It realizes the miniaturization and dual-band of WLAN/WIMAX antenna, and is suitable for WLAN2.45GHz and WIMAX3.5GHz.

Specifically as shown in FIG. 1 , the first radiating section 3 is a rectangular ring structure. Radiation at 2.45 GHz is achieved through the rectangular ring structure.

The second radiating section 4 is an L-shaped structure. The second radiating section 4 of the L-shaped structure can reduce the size of the antenna and increase the resonant path. The first radiating section 3 and the second radiating section are connected by a third radiating metal strip 5, one end of which is connected to the middle of the long side of the L-shaped structure, and the other end is connected to the top of the rectangular ring structure. middle part.

The microstrip feeder 2 is also connected to a bent first radiating metal strip 6 . The first radiating metal strip 6 forms an undercut structure, and each section is a straight line structure.

A second radiating metal strip 7 connected to the microstrip feeder 2 is further arranged between the microstrip feeder 2 and the first radiating metal strip 6 . The introduction of the first radiating metal strip 6 and the second radiating metal strip 7 makes impedance matching at 3.5 GHz and increases the bandwidth. Impedance matching at 3.5 GHz can be achieved by changing the size of the first radiating metal strip 6 and the second radiating metal strip 7 . Specifically, the high-frequency simulation software HFSS can be used to simulate and optimize the design of the antenna to obtain the best size and tuning relationship.

The second radiating metal strip 7 is preferably also a bent structure. Radiation at 3.5 GHz is achieved through the second radiating section 4 of the L-shaped structure and the bent metal belt.

The second radiating section 4 is preferably located in the first radiating section 3, that is, the second radiating section 4 is located in the rectangular ring structure of the first radiating section 3. This structure increases the resonant path of the antenna, thereby reducing The size of the antenna is reduced, and the effective bandwidth of the antenna is increased at the same time.

The dielectric substrate 1 is an FR4 substrate (that is, an epoxy board). The relative permittivity of FR4 is 4.4, and the dielectric loss is 0.02.

In this way, the dual-band WLAN/WIMAX antenna of the present invention is a monopole antenna based on a microstrip patch, and realizes the radiation of 2.45 GHz through a microstrip feeder 2 and the first radiation section 3 of a rectangular ring structure, The radiation of 3.5GHz is realized by the second radiating section 4 of the L-shaped structure connected with the first radiating section 3 and the first radiating metal strip 6 connected with the microstrip feeder 2, and the present invention is applicable to WLAN2.45GHz and WiMAX3. 5GHz, simple structure, easy to manufacture, and low cost.

As an example, as shown in Figure 1 and Figure 2, the size of each parameter of the antenna in the embodiment is:

The length and width of the dielectric substrate 1 are L=16cm, W=28mm, and the thickness is 1.6mm; the size of the metal floor 8 on the lower surface of the dielectric substrate 1 is p1=1mm, L=16mm; the length of the microstrip feeder 2 is K= 14mm, width w1=1.5mm; the parameters of the first radiating section 3 are length L1=14mm, width L2=14mm, lower gap width w2=1mm, side gap width w3=1mm; the size of the second radiating section 4 Respectively, the width n2=5mm, the long-side gap width w5=1mm; the size of the third radiating metal strip 5 connected to the first radiating section 3 and the second radiating section 4 is length n1=1mm, width w4=0.5mm; and The size of the second radiating metal strip 7 connected to the microstrip feeder 2 is length m4=4mm, width w7=0.5mm; the size of the first radiating metal strip 6 connected to the microstrip feeder 2 is the length of the long side m1=5mm , width m2=5mm, short side length m3=4mm, middle gap width w6=1mm.

In the present invention, various performance indexes of the dual-frequency monopole antenna WLAN/WiMAX are tested by using HFSS software, and the obtained return loss curve is shown in FIG. 3 . It can be seen from the figure that the working frequency band below -10dB is 2.35GHz~2.49GHz and 3.36GHz~3.66GHz, so the bandwidth meets the working requirements and achieves a good impedance matching effect. Figure 4 is the E-plane and H-plane pattern of the monopole dual-band WLAN/WiMAX antenna at 2.45GHz. It can be seen from the figure that the gain is 1.66dBi at the frequency of 2.45GHz. The E-plane and H-plane pattern of the WiMAX antenna at 3.5GHz can be seen from the figure, when the frequency is 3.5GHz, the gain is 1.55dBi, so the present invention has good omnidirectionality. The return loss of the antenna of the present invention satisfies the requirement of the bandwidth, the E surface of the antenna is like an "8" pattern, the H surface is an omnidirectional pattern, and the gain meets the requirements of the antenna. The feeding mode is microstrip line feeding.

Compared with prior art, technical characteristic and effect of the present invention are as follows:

The present invention realizes the radiation of 2.45 GHz and 3.5 GHz by introducing an L-shaped second radiating segment into the first radiating segment of a rectangular ring structure and arranging bent metal strips on the microstrip feeder line. This structure increases The resonant path of the antenna is improved, thereby reducing the size of the antenna and increasing the effective bandwidth of the antenna.

The antenna in the present invention has a compact structure (28mm*16mm*1.6mm), and can be easily integrated into WLAN and WiMAX equipment.

The bent metal strip increases the bandwidth of the antenna, realizes the multi-frequency design, has good matching characteristics, and the antenna pattern is relatively stable in all working frequency bands.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (8)

1. a monopole double frequency-band WLAN/WiMAX antenna, is characterized in that, the metal floor comprising medium substrate, be positioned at the microstrip structure of medium substrate upper surface, be positioned at medium substrate lower surface; Described microstrip structure comprises a microstrip feed line, the first radiant section be connected with described microstrip feed line, the second radiant section of being connected with described first radiant section.

2. monopole double frequency-band WLAN/WiMAX antenna according to claim 1, it is characterized in that, described first radiant section is straight-flanked ring structure.

3. monopole double frequency-band WLAN/WiMAX antenna according to claim 1, it is characterized in that, described second radiant section is L-type structure.

4. monopole double frequency-band WLAN/WiMAX antenna according to claim 1, is characterized in that, the first radiation metal band that described microstrip feed line also bends with is connected.

5. monopole double frequency-band WLAN/WiMAX antenna according to claim 4, is characterized in that, is also provided with the second radiation metal band being connected to microstrip feed line between described microstrip feed line and the first radiation metal band.

6. monopole double frequency-band WLAN/WiMAX antenna according to claim 5, is characterized in that, described second radiation metal band is bending structure.

7. monopole double frequency-band WLAN/WiMAX antenna according to claim 2, it is characterized in that, described second radiant section is in the first radiant section.

8. monopole double frequency-band WLAN/WiMAX antenna according to claim 1, it is characterized in that, described medium substrate is FR4 substrate.