CN217405706U - Novel microstrip antenna and series-fed array antenna using same as array element - Google Patents
Novel microstrip antenna and series-fed array antenna using same as array element Download PDFInfo
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- CN217405706U CN217405706U CN202221620032.8U CN202221620032U CN217405706U CN 217405706 U CN217405706 U CN 217405706U CN 202221620032 U CN202221620032 U CN 202221620032U CN 217405706 U CN217405706 U CN 217405706U
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Abstract
The utility model relates to a novel microstrip antenna and use its series feed array antenna as array element, including the base plate, arrange the radiation paster and the plane of reflection of base plate both sides respectively in, two L shape grooves of symmetry are seted up on radiation paster surface, and the radiation paster is connected with the microstrip feeder through quarter wavelength converter. In addition, a plurality of rectangular patches which are connected through narrow microstrip line coplanar series feed printed on the upper layer of the substrate are arranged on the substrate, and each rectangular patch is connected between the radiation patch and the quarter-wavelength converter. The utility model discloses the structure is through sculpture L shape groove on the microstrip paster, has changed the current path around the microstrip antenna L shape groove, makes the L shape groove around the equivalent introduce extra resonant frequency, can effectually widen the microstrip antenna bandwidth, meanwhile, designs a section series on this basis and presents array antenna, adopts a plurality of frequency channels that arouse the antenna in the grooved design of last paster of antenna array element, and then has widened microstrip antenna's bandwidth.
Description
Technical Field
The utility model relates to a microstrip antenna especially relates to a novel microstrip antenna and use its array antenna that presents as the array element's cluster.
Background
The microstrip antenna has been widely applied in the past decades due to the advantages of small appearance, low profile, easy conformality and easy integration with the PCB process, and has wide application prospects in the fields of wireless communication, vehicle-mounted radar and aerospace. Microstrip antennas, however, have their own drawbacks, with the microstrip antennas having a relatively narrow bandwidth, typically only a few percent of the relative bandwidth. Therefore, the impedance bandwidth of the microstrip antenna is very important to be practically widened.
In recent years, with respect to the disadvantage of narrow bandwidth of a microstrip antenna, researchers in various countries have made a lot of research, and research shows that the bandwidth of the microstrip antenna is affected by the dielectric constant and the thickness of a dielectric substrate, so that the quality factor of an antenna equivalent resonant circuit can be reduced by increasing the thickness of the dielectric substrate and reducing the dielectric constant of the dielectric substrate.
The impedance bandwidth of the microstrip antenna can be effectively expanded by reducing the quality factor, and the quality factor of a circuit can be reduced by adopting a large-loss substrate or doping a lossy material such as ferrite. This approach is feasible but also leads to the additional problem that thicker substrates tend to excite additional radiation modes, which interfere with the radiation pattern of the antenna. In addition, in the antenna design, the thickness and dielectric constant of the dielectric plate affect surface waves among the antenna elements of the array to different degrees, which may cause the operating frequency of the antenna to shift, and even affect the communication and receiving effects of the whole system. In addition, the impedance bandwidth of the antenna actually depends on the impedance matching effect of each part between antenna systems, and when the microstrip line is used as the feed line and the impedance matching network of the microstrip antenna, the substrate of the thick substrate needs a wider microstrip line width under the same characteristic impedance, so that more electromagnetic waves leak out from two sides of the microstrip line, thereby affecting the gain of the antenna array. In addition, there are many methods such as using multi-layer dielectric substrate, aperture coupling feed to expand the bandwidth of microstrip antenna, and the above method places the antenna and feed network on different dielectric surfaces, so that a wider frequency bandwidth can be obtained, but the design difficulty and manufacturing cost of the antenna are correspondingly increased, and the application of the antenna on a low-cost single-layer board is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome exist among the prior art not enough, provide a novel microstrip antenna and use its array antenna of presenting as array element's cluster.
The utility model discloses a realize through following technical scheme:
the novel microstrip antenna comprises a substrate, radiation patches and reflecting surfaces, wherein the radiation patches and the reflecting surfaces are arranged on two sides of the substrate respectively, two symmetrical L-shaped grooves are formed in the surface of each radiation patch, and each radiation patch is connected with a microstrip feeder line through a quarter-wavelength converter. The radiation patch is characterized in that a rectangular groove is formed in one side edge of the radiation patch, the side edge of the radiation patch, which is provided with the rectangular groove, is a slotted side edge, and the two L-shaped grooves are symmetrically located on two sides of the rectangular groove.
According to the above technical solution, preferably, the radiation patch is connected with a microstrip feeder line at the rectangular slot through a quarter-wavelength transformer, and the two L-shaped slots are symmetrically arranged at two sides of the microstrip feeder line.
According to the above technical solution, preferably, the two L-shaped slots are formed on the side of the slot of the radiation patch.
According to the above technical solution, preferably, the radiation patch and the reflection surface are both made of copper foil, and the radiation patch and the reflection surface have the same thickness.
According to the technical scheme, preferably, the substrate is made of Rogers 4835, the dielectric constant is 3.480, the tan δ is 0.0037, the thickness of the substrate is 0.1mm, and the operating frequency of the antenna is 77 GHz.
This patent still discloses an array antenna is presented to the cluster to above-mentioned novel microstrip antenna is the array element, still be equipped with on the base plate through printing a plurality of rectangle pasters that link to each other are presented to the coplane series of the narrow microstrip line on base plate upper strata, each rectangle paster is connected between radiation paster and quarter wavelength converter.
According to the above technical solution, preferably, the number of the rectangular patches is not less than 4.
The utility model has the advantages that:
the utility model discloses structural design scientific and reasonable, easily realize, based on multifrequency antenna principle, through sculpture L shape groove on the microstrip paster, the current path around the microstrip antenna L shape groove has been changed, make the L shape groove additional resonant frequency of equivalent introduction around, can effectually widen the microstrip antenna bandwidth, meanwhile, design a section of series on this basis and present array antenna, adopt and arouse a plurality of frequency channels of antenna in the slotted design of last paster of antenna array element, and then widened microstrip antenna's bandwidth.
Drawings
Fig. 1 is a schematic view of the structure of a radiation patch part of the present invention.
Fig. 2 is a schematic view of a current distribution and an equivalent circuit of a conventional microstrip antenna.
Fig. 3 is a schematic diagram of a current path and an equivalent circuit of a microstrip antenna provided with an L-shaped slot.
Fig. 4 is a schematic structural diagram of a series-fed array antenna of the present invention.
FIG. 5 shows the reflection coefficient S 11 With x 0 A curve of variation.
FIG. 6 is a plot of the reflection coefficients of MPA1 and MPA 2.
Fig. 7 is an E-plane pattern loaded with an L-slot series fed antenna.
In the figure: 1. a radiation patch; 2. an L-shaped slot; 3. a quarter-wave transformer; 4. a microstrip feed line; 5. a rectangular groove; 6. slotting side edges; 7. rectangular paster; 8. a narrow microstrip line.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the utility model.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
According to the above embodiment, preferably, the radiation patch 1 is connected with a microstrip feed line 4 at the rectangular slot 5 through a quarter-wave transformer 3, and the two L-shaped slots 2 are symmetrically arranged on two sides of the microstrip feed line 4. In this example, the microstrip feed line 4 is connected to one end of the quarter-wave transformer 3, and the other end of the quarter-wave transformer 3 is inserted into the rectangular slot 5 through the microstrip line, so that it is connected to the radiation patch 1. The principle of this setting is as follows: the microstrip antenna is fed by a microstrip feed line 4 with characteristic impedance of 50 ohms, the line width of the microstrip feed line 4 is 0.2mm, the impedance of different positions on the radiation patch 1 is greatly different, the center impedance is the lowest, the edge impedance is generally between 100 ohms and 200 ohms, and therefore the impedance between the input impedance and the microstrip feed line 4 needs to be matched through a section of quarter-wave converter 3 between the radiation patch 1 and the microstrip feed line 4.
According to the above embodiment, preferably, two L-shaped slots 2 are opened on the slotted side 6 of the radiation patch 1. The lengths x0 of the transverse edge (bottom edge) of the L-shaped slot 2 from the bottom (slot side 6) of the radiation patch 1 are set to be x 0-0 mm, x 0-0.05 mm, and x 0-0.1 mm, respectively, by using the HFSS, and the reflection coefficient S11 of the microstrip antenna changes with the change of the value of x0, as shown in fig. 5, the operating frequency of the antenna moves to the low frequency direction with the increase of the length value, wherein the bandwidth performance of x 0-0 is the best. Therefore, in this example, it is preferable to open the two L-shaped grooves 2 on the slotted side 6 of the radiation patch 1.
The utility model discloses technical principle as follows: the traditional microstrip antenna can be equivalent to a simple resonant circuit, the current distribution and the equivalent circuit of the antenna are shown in fig. 2, and the inductance and the capacitance in the circuit are determined by the length of a current path. The present invention changes the current path on the radiation patch due to the presence of the L-shaped slot, as shown in fig. 3. The current path is the same as that in the unloaded state at the middle position of the radiating patch loaded with the L-shaped groove, the middle part of the antenna induces a frequency close to the resonant frequency of the unloaded L-shaped groove when the antenna resonates, and the current flows around the edge of the L-shaped groove due to the existence of the L-shaped groove at the bottom parts of two sides of the radiating edge, so that the current flowing path is increased. From the perspective of equivalent LC resonance, an additional inductance L is equivalently connected in series 2 The part of the edge represents a slightly lower frequency, when the two frequencies are combined, the bandwidth of the microstrip antenna increases, and from the viewpoint of the equivalent slot field, the current paths on both sides increase, equivalently, the distance of the radiating edge increases. Due to the antennaThe size is inversely proportional to the resonant frequency, so loading both sides of the L-shaped slot is equivalent to introducing an additional resonant frequency, which is lower than the original operating frequency, and when the two frequencies are superimposed, the bandwidth of the microstrip antenna is increased.
In the application, the E-shaped antenna loaded with the L-shaped groove of the single patch effectively improves the impedance bandwidth, but the gain of the single patch is lower, and on the basis, a series feed array antenna is designed, and the last antenna unit of the traditional series feed array is replaced by a micro-strip antenna etched with the L-shaped groove. For the sake of more clear illustration of the function of the L-shaped slot, a conventional 1x10 series-fed antenna is compared and named as MAP1, and a novel series-fed antenna is named as MPA 2.
The HFSS is used for carrying out simulation analysis on the series-fed antenna MPA1 which is not loaded with the L-shaped structure and the MPA2 which is loaded with the L-shaped structure, and the simulation result shows that the working frequency of the two series-fed antenna arrays falls to 77GHz, and the frequency is mainly used for vehicle-mounted radars. In order to better discuss the characteristics of a series fed antenna loaded with an L-shaped slot, we performed a parametric study. As shown in the S parameter diagram of the series-fed antenna in fig. 6, the-10 dB impedance bandwidth range of the conventional non-slotted series-fed antenna MPA1 is 75.08GHz to 78.68GHz, the relative bandwidth is 4.7%, the-10 dB impedance bandwidth range of the MPA2 having the L-shaped slot at the extreme end of the series-feed is 76.48GHz to 82.96GHz, the relative bandwidth is 7.1%, and the microstrip antenna bandwidth is effectively widened. The maximum gain value of the series-fed antenna is 15.8dBi as shown in an E-plane directional diagram 7 of the series-fed antenna, and simulation results show that the bandwidth of the series-fed antenna can be widened by loading an L-shaped groove similar to a single microstrip antenna unit.
The utility model discloses structural design scientific and reasonable, easily realize, based on multifrequency antenna principle, through sculpture L shape groove on the microstrip paster, the current path around the microstrip antenna L shape groove has been changed, make the L shape groove additional resonant frequency of equivalent introduction around, can effectually widen the microstrip antenna bandwidth, meanwhile, design a section of series on this basis and present array antenna, adopt and arouse a plurality of frequency channels of antenna in the slotted design of last paster of antenna array element, and then widened microstrip antenna's bandwidth.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The novel microstrip antenna is characterized by comprising a substrate, a radiation patch and a reflecting surface, wherein the radiation patch and the reflecting surface are respectively arranged on two sides of the substrate, two symmetrical L-shaped grooves are formed in the surface of the radiation patch, and the radiation patch is connected with a microstrip feeder line through a quarter-wavelength converter.
2. The microstrip antenna according to claim 1, wherein the radiating patch has a rectangular slot on one side, and the rectangular slot is a slotted side.
3. The microstrip antenna of claim 2 wherein the two L-shaped slots are symmetrically located on both sides of the rectangular slot.
4. A novel microstrip antenna according to claim 2 or 3 wherein said radiating patch is connected to a microstrip feed line at the rectangular slot by a quarter-wave transformer, and said two L-shaped slots are symmetrically disposed on both sides of the microstrip feed line.
5. The microstrip antenna of claim 2 wherein two of the L-shaped slots are formed on the slot sides of the radiating patch.
6. The microstrip antenna according to claim 1, wherein the radiating patch and the reflecting surface are both made of copper foil, and the thickness of the radiating patch and the thickness of the reflecting surface are the same.
7. A novel microstrip antenna according to claim 1 or 6 wherein the substrate is made of Rogers 4835, has a dielectric constant of 3.480, has a tan δ of 0.0037, has a thickness of 0.1mm, and has an operating frequency of 77 GHz.
8. A series-fed array antenna, which uses the novel microstrip antenna of any one of claims 1 to 7 as an array element, and is characterized in that a plurality of rectangular patches which are connected through narrow microstrip line coplanar series-feeding printed on the upper layer of the substrate are further arranged on the substrate, and each rectangular patch is connected between a radiation patch and a quarter-wavelength converter.
9. The series fed array antenna of claim 8, wherein the rectangular patches are not less than 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221620032.8U CN217405706U (en) | 2022-06-27 | 2022-06-27 | Novel microstrip antenna and series-fed array antenna using same as array element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221620032.8U CN217405706U (en) | 2022-06-27 | 2022-06-27 | Novel microstrip antenna and series-fed array antenna using same as array element |
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| Publication Number | Publication Date |
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| CN217405706U true CN217405706U (en) | 2022-09-09 |
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| CN202221620032.8U Active CN217405706U (en) | 2022-06-27 | 2022-06-27 | Novel microstrip antenna and series-fed array antenna using same as array element |
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| CN (1) | CN217405706U (en) |
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