CN205159512U - A coplanar waveguide fed polarization reconfigurable four-leaf clover antenna - Google Patents

Abstract

The utility model discloses a four leaves of coplane waveguide feed polarization restructural grass antenna, including positive radiating element, reverse side radiating element, medium base plate, first wire, second wire, privates, privates, joint and power supply module, positive radiating element is including radiating subassembly, feed line and ground structure, and the ground structure is the frame type, the radiation subassembly is located the ground structure, including first paster, second paster and first PIN diode, ground structure and first paster and second paster all at the coplanar, connect the probe that links to each other, connects with the ground structure and link to each other with the feed line, reverse side radiating element is crossing with radiation subassembly antarafacial, including third paster, fourth paster and second PIN diode. Adopt two diodes just can realize two kinds of polarization mode of left -hand circular polarization and right hand circular polarization as the switch, can restrain multipath effect's influence, adopt coplane waveguide feed, the radiation subassembly can integrate at coplanar, easy and other radio frequency devices with the ground structure.

Description

A coplanar waveguide fed polarization reconfigurable four-leaf clover antenna

technical field

The utility model relates to an antenna technology, in particular to a coplanar waveguide fed polarization reconfigurable four-leaf clover antenna, which belongs to the field of wireless communication.

Background technique

Antenna is one of the most important components in the field of wireless communication, and its main function is to receive and transmit electromagnetic waves. With the development of society and the advancement of science and technology, reconfigurable antennas have also been continuously expanded, thereby promoting the generation of polarization reconfigurable antennas. In the polarization diversity communication system, the polarization reconfigurable antenna is an indispensable member, so the research on this kind of antenna becomes very meaningful.

Microstrip antennas are widely used in the design of reconfigurable antennas due to their excellent characteristics such as easy integration with components, small size, and low profile.

Utility model content

The main purpose of the utility model is to overcome the deficiencies in the prior art and provide a novel structure coplanar waveguide fed polarization reconfigurable four-leaf clover antenna, which is especially suitable for communications such as WLAN wireless local area networks that require polarization diversity. System application, the technical problem to be solved by the utility model is the problem of reconfiguration of the antenna polarization mode.

In order to achieve the above object, the technical solution adopted in the utility model is:

A coplanar waveguide fed polarization reconfigurable four-leaf clover antenna, comprising a front radiating unit, a back radiating unit, a dielectric substrate, a first wire, a second wire, a third wire, a fourth wire, a connector and a power supply assembly, the The front radiating unit is etched on the front of the dielectric substrate, the front radiating unit includes a radiating component, a feeder line and a ground structure, and the ground structure is frame-shaped; the radiating component is located in the ground structure and includes a first patch, a second The patch and the first PIN diode; the first patch and the second patch are connected through the first PIN diode, the anode of the first PIN diode is connected to the first patch, and the ground structure is connected to the first patch Both are on the same plane as the second patch, the connector is connected to the ground structure, and the probe of the connector is connected to the feeder.

Wherein, the radiation unit on the back side is etched on the back side of the dielectric substrate and intersects with the radiation component on different planes, the radiation unit on the back side includes a third patch, a fourth patch and a second PIN diode, and the third patch and the fourth patch The patch is connected through a second PIN diode, and the anode of the second PIN diode is connected to the third patch; one end of the first wire is connected to the anode of the first PIN diode, and one end of the second wire is connected to the first The cathode of the PIN diode is connected, one end of the third wire is connected to the cathode of the second PIN diode, one end of the fourth wire is connected to the anode of the second PIN diode, the other end of the first wire is connected to the third wire The other end of the second wire is connected to form a first connection point, the other end of the second wire is connected to the other end of the fourth wire to form a second connection point, and the first connection point and the second connection point are connected through a power supply assembly.

The utility model is further configured as follows: the radiation assembly and the back radiation unit are both axisymmetric structures, the radiation assembly has a front symmetry axis, the front symmetry axis passes through the center of the radiation assembly, the first patch, The first PIN diode and the second patch are located on the front symmetry axis; the back radiating unit has a back symmetry axis, the back symmetry axis passes through the center of the back radiating unit, the third patch, the second PIN diode and the fourth patch are located on the reverse axis of symmetry; the reverse radiation unit is arranged orthogonally to the radiation component.

The utility model is further configured as follows: the inner corner of the ground structure is provided with adjusting support bars symmetrically distributed with the feeder as the central axis, and both ends of each adjusting support bar are connected to the ground structure.

The utility model is further configured as follows: the adjustment support bar is two semicircular arc-shaped support bars distributed in the same direction and opening towards the inner corner of the ground structure.

The utility model is further set as: the power supply component is a dry battery.

The utility model is further set as: the medium substrate is FR4 epoxy resin glass fiber board.

The utility model is further configured as follows: the first patch, the second patch, the third patch and the fourth patch are all four-leaf clover-shaped structures.

The utility model is further set as: the thickness of the dielectric substrate is 0.8mm.

The utility model is further configured as follows: both the front radiation unit and the back radiation unit are made of copper.

Compared with the prior art, the utility model has the beneficial effects of:

Using two diodes as switches can realize the working status of left-hand circular polarization and right-hand circular polarization. The diversity of polarization methods can suppress the influence of multipath effects when applied in WLAN, and has good performance. Engineering application background; with coplanar waveguide feeding, the radiation component can be on the same plane as the ground structure, which is easy to integrate with other radio frequency devices.

The above content is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly, the utility model will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the front structural representation of the utility model embodiment;

Fig. 2 is an enlarged view of part A in Fig. 1;

Fig. 3 is the reverse structure schematic diagram of the utility model embodiment;

Fig. 4 is an enlarged view of part B in Fig. 3;

Fig. 5 is the side structure schematic diagram of the utility model embodiment;

Fig. 6 is the schematic circuit diagram of the utility model embodiment;

Fig. 7 is the measured S parameter of the utility model embodiment;

Fig. 8 is the measured axial ratio of the utility model embodiment;

Fig. 9 is the measured gain of the utility model embodiment;

Fig. 10 is the coplanar polarization and cross polarization direction diagrams of the embodiment of the present invention in the working state of left-handed circular polarization;

Fig. 11 is the coplanar polarization and cross polarization direction diagrams of the embodiment of the present invention in the working state of right-handed circular polarization.

detailed description

Below in conjunction with accompanying drawing of description, the utility model is described further.

As shown in Figures 1 to 6, a coplanar waveguide fed polarization reconfigurable four-leaf clover antenna includes a front radiating unit 1, a back radiating unit 2, a dielectric substrate 3, a first wire 4, a second wire 5, The third wire 6, the fourth wire 7, the joint 8 and the power supply assembly 9, the power supply assembly 9 is a dry battery, the dielectric substrate 3 is a FR4 epoxy resin glass fiber board with a thickness of 0.8mm, the first patch 13, The second patch 14 , the third patch 16 and the fourth patch 17 are all four-leaf clover-shaped structures, and the front radiation unit 1 and the back radiation unit 2 are all made of copper.

The front radiation unit 1 is etched on the front of the dielectric substrate 3, the front radiation unit 1 includes a radiation component 10, a feeder 11 and a ground structure 12, the ground structure 12 is a frame type; the radiation component 10 is located on the ground structure 12 Inside, including the first patch 13, the second patch 14 and the first PIN diode 15; the first patch 13 and the second patch 14 are connected through the first PIN diode 15, and the first PIN diode 15 The positive pole is connected to the first patch 13, the ground structure 12 is on the same plane as the first patch 13 and the second patch 14, the joint 8 is connected to the ground structure 12, the probe of the joint 8 is connected to the feeder line 11 connected.

The radiation unit 2 on the back side is etched on the back side of the dielectric substrate 3 and intersects with the radiation component 10 on a different plane. The radiation unit 2 on the back side includes a third patch 20, a fourth patch 21 and a second PIN diode 22. The third patch The patch 20 and the fourth patch 21 are connected through the second PIN diode 22 , and the anode of the second PIN diode 22 is connected with the third patch 20 .

As shown in Figures 1 to 4, both the radiation assembly 10 and the back radiation unit 2 are axisymmetric structures, the radiation assembly 10 has a front symmetry axis, and the front symmetry axis passes through the center of the radiation assembly 10, so The first patch 13, the first PIN diode 15 and the second patch 14 are located on the front symmetry axis; the back radiation unit 2 has a back symmetry axis, and the back symmetry axis passes through the center of the back radiation unit 2, The third patch 20 , the second PIN diode 22 and the fourth patch 21 are located on the reverse axis of symmetry; the reverse radiation unit 2 is arranged orthogonally to the radiation component 10 .

As shown in Figure 6, one end of the first lead 4 is connected to the anode of the first PIN diode 15, one end of the second lead 5 is connected to the cathode of the first PIN diode 15, and one end of the third lead 6 is It is connected with the cathode of the second PIN diode 22, one end of the fourth wire 7 is connected with the anode of the second PIN diode 22, and the other end of the first wire 4 is connected with the other end of the third wire 6 to form the first connection. Point 40 , the other end of the second wire 5 and the other end of the fourth wire 7 are connected to form a second connection point 50 , and the first connection point 40 and the second connection point 50 are connected through the power supply assembly 9 .

As shown in Figure 1, the inner corner of the ground structure 12 is provided with the adjustment support bars 16 symmetrically distributed with the feeder line 11 as the central axis, and the two ends of each adjustment support bar 16 are connected to the ground structure; The adjusting support bar 16 is two semicircular arc-shaped support bars distributed in the same direction and opening towards the inner corner of the ground structure 12 .

The specific dimensions of the coplanar waveguide fed polarization reconfigurable four-leaf clover antenna of the present invention are shown in Table 1 in combination with the dimensions in Figure 1, and the unit of dimension is mm.

W 65 Rs. 11.7 L 45 d 1 h 0.8 R1 4 g 0.3 R2 9 w 3 ls 32

Table 1

As shown in Figure 1 and Figure 3, a and b are connected to the same level, and c and d are connected to the same level. When a and b are connected to positive voltage, and c and d are connected to negative voltage, the first PIN diode 15 is turned on, while the second PIN diode 22 is turned off, and the antenna realizes left-handed circular polarization; similarly, when a and b are connected to negative voltage, When c and d are connected to a positive voltage, the first PIN diode 15 is turned off, while the second PIN diode 22 is turned on, and the antenna realizes right-handed circular polarization.

As shown in FIG. 7 , the measured S11 parameter of the antenna of this embodiment is the return loss parameter of the antenna. It can be seen from the figure that the impedance bandwidth below -10dB of the two polarization states of the antenna is 2.28GHz-2.58GHz; within this bandwidth, the antenna has good impedance matching and radiation characteristics.

Figure 8 shows the measured axial ratio of the antenna in this embodiment. The axial ratio is a key index to measure the circular polarization performance of the antenna. In general engineering, it is considered that the axial ratio of the antenna is less than 3dB for circular polarization radiation. It can be seen from the figure that the 3dB axial ratio bandwidth of the antenna is 2.10-2.55GHz in two polarization states.

As shown in FIG. 9, the measured gain of the antenna of this embodiment is shown. In the two working states, the gain varies from 2.34 to 3.89dBi within the impedance bandwidth, and the maximum gain occurs at 2.37GHz.

Fig. 10 and Fig. 11 show the coplanar polarization and cross polarization pattern of the antenna of this embodiment. Fig. 10 is the coplanar polarization and cross-polarization pattern of the antenna in the left-handed circular polarization working state, and Fig. 11 is the co-planar polarization and cross-polarization pattern of the antenna in the right-handed circular polarization working state. It can be seen that the directivity patterns of the two polarization states are symmetrically distributed, and the circularly polarized radiation performance is good.

The innovation of this utility model lies in that the coplanar waveguide fed polarized reconfigurable four-leaf clover antenna adopts a double-sided four-leaf clover structure, and only two PIN diodes are used to control its on-off through a dry battery, so that the upper and lower sides of the antenna can Turning on or off the blades of the antenna can control the change of the polarization mode of the antenna, thereby realizing reconfigurable polarization.

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solutions of the present utility model, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solutions of the present utility model The content of the scheme, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (9)

1. A coplanar waveguide fed polarization reconfigurable four-leaf clover antenna is characterized in that: it comprises a front radiation unit, a back radiation unit, a dielectric substrate, a first lead, a second lead, a third lead, a fourth lead, Connectors and power supply components, the front radiation unit is etched on the front of the dielectric substrate, the front radiation unit includes radiation components, feeders and ground structures, the ground structure is frame-shaped; the radiation components are located in the ground structure, including the first A patch, a second patch and a first PIN diode; the first patch and the second patch are connected through the first PIN diode, the anode of the first PIN diode is connected to the first patch, and the ground The structure is on the same plane as the first patch and the second patch, the joint is connected to the ground structure, and the probe of the joint is connected to the feeder; The radiation unit on the back side is etched on the back side of the dielectric substrate and intersects with the radiation component on different planes. The radiation unit on the back side includes a third patch, a fourth patch and a second PIN diode, and the third patch and the fourth patch connected through a second PIN diode, and the anode of the second PIN diode is connected to the third patch; One end of the first wire is connected to the anode of the first PIN diode, one end of the second wire is connected to the cathode of the first PIN diode, and one end of the third wire is connected to the cathode of the second PIN diode. One end of the fourth wire is connected to the anode of the second PIN diode, the other end of the first wire is connected to the other end of the third wire to form a first connection point, the other end of the second wire and the other end of the fourth wire One end is connected to form the second connection point, and the first connection point and the second connection point are connected through the power supply assembly. 2. A coplanar waveguide-fed polarization reconfigurable four-leaf clover antenna according to claim 1, characterized in that: the radiation component and the back radiation unit are axisymmetric structures, and the radiation component has a frontal symmetry axis, the front symmetry axis passes through the center of the radiation assembly, and the first patch, the first PIN diode and the second patch are located on the front symmetry axis; The back radiating unit has a back symmetry axis, the back symmetry axis passes through the center of the back radiating unit, the third patch, the second PIN diode and the fourth patch are located on the back symmetry axis; The radiation unit on the back surface is arranged orthogonally to the radiation component. 3. A coplanar waveguide-fed polarization reconfigurable four-leaf clover antenna according to claim 1, characterized in that: the inner corner of the ground structure is provided with a symmetrical distribution of the feeding line as the central axis. The two ends of each adjusting branch are connected with the ground structure. 4. A coplanar waveguide-fed polarization reconfigurable four-leaf clover antenna according to claim 3, characterized in that: the adjustment struts are two semicircular arcs distributed in the same direction and opening towards the inner corner of the ground structure shaped branch. 5. A coplanar waveguide-fed polarization reconfigurable four-leaf clover antenna according to claim 1, characterized in that: the power supply component is a dry battery. 6 . The coplanar waveguide fed polarization reconfigurable four-leaf clover antenna according to claim 1 , wherein the dielectric substrate is FR4 epoxy resin glass fiber board. 7. A coplanar waveguide fed polarization reconfigurable four-leaf clover antenna according to claim 1, characterized in that: the first patch, the second patch, the third patch and the fourth patch All are four-leaf clover-shaped structures. 8 . The coplanar waveguide fed polarization reconfigurable four-leaf clover antenna according to claim 1 , wherein the thickness of the dielectric substrate is 0.8 mm. 9. A coplanar waveguide-fed polarization reconfigurable four-leaf clover antenna according to claim 1, characterized in that: both the front radiation unit and the rear radiation unit are made of copper.