CN114024130B - A low profile broadband solar cell antenna - Google Patents

Abstract

A low profile broadband solar cell antenna comprising: an upper dielectric plate (1) and a lower dielectric plate (4) which are parallel to each other, a radiation structure, a feed structure, a director structure and a filtering structure; the radiation structure is positioned on the upper surface of the upper medium plate (1) and is connected with the filtering structure through a converging belt (3) and a direct current feeder (9), and the radiation structure comprises a plurality of solar cell strings (2) which are sequentially connected in parallel and are mutually parallel; the feed structure comprises a slotted floor (7) positioned on the upper surface of the lower dielectric plate (4) and a microstrip line (6) positioned on the lower surface of the lower dielectric plate, the director structure comprises two directors (8) vertically positioned between the upper dielectric plate (1) and the lower dielectric plate (4), the filter structure comprises a filter (5), and the filter (5) is positioned on the lower surface of the lower dielectric plate (4). The application ensures that the antenna has stable radiation performance.

Description

A low profile broadband solar cell antenna

Technical field

The invention belongs to the technical field of solar cell antennas, and specifically relates to a low-profile broadband solar cell antenna.

Background technique

At present, the continuous innovation of science and technology has promoted the development of modern wireless communication technology. The demand for antennas in communication systems is steadily increasing, and the energy consumed by the system is also increasing. Existing wireless communication systems mainly rely on fossil fuels for power supply. The gases emitted by the burning of fossil fuels will cause the greenhouse effect, and burning residual substances will lead to frequent haze weather. Solar energy, as the most promising renewable energy, is the best way to realize green communications. One of the effective methods.

Although there are currently antenna designs with integrated solar cells, there are problems such as high antenna profile height, narrow bandwidth, and small front-to-back ratio of the antenna. It cannot simultaneously achieve green communications with low profile, wideband, and high front-to-back ratio performance. .

Contents of the invention

In order to solve the above problems, the present invention provides a low-profile broadband solar cell antenna, including: an upper dielectric plate and a lower dielectric plate parallel to each other, a radiation structure, a feed structure, a director structure and a filter structure; wherein, the The radiation structure is located on the upper surface of the upper dielectric plate and is connected to the filter structure through a bus strip and a DC feeder. The radiation structure includes multiple strings of solar cells connected in parallel and parallel to each other; the feed structure includes a The grooved floor on the upper surface of the lower dielectric board and the microstrip line on the lower surface of the lower dielectric board. The director structure includes two vertically located between the upper dielectric board and the lower dielectric board. Director, the filtering structure includes a filter, and the filter is located on the lower surface of the lower dielectric plate.

Preferably, the thickness of the upper dielectric plate is 0.762 mm.

Preferably, the thickness of the lower dielectric plate is 0.7874 mm.

Preferably, the air gap between the upper dielectric plate and the lower dielectric plate is 8.1 mm.

Preferably, multiple strings of solar cell strings are arranged at equal intervals, and the lateral spacing between any two adjacent strings of solar cell strings is 3.5 mm.

Preferably, the number of solar cell strings is three.

Preferably, the size of the solar cell string is 79.75 mm×40.8 mm.

Preferably, the front and rear ends of multiple strings of solar cells are connected in parallel by transversely distributed bus strips.

Preferably, the grooved floor includes two grooves with a size of 7.5 mm x 33.7 mm.

Preferably, the guide is composed of two inverted L-shaped copper structures, and the two guides respectively correspond to the center positions of the two grooves perpendicular to the grooved floor.

The low-profile broadband solar cell antenna provided by the invention has the following beneficial effects:

The low-profile broadband solar cell antenna provided by the present invention adds a director to the solar cell antenna, so that the antenna can effectively improve the front-to-back ratio of the solar cell antenna while having green communications, so that it has stable radiation performance; using Multiple strings of solar cells can increase the distribution rate, have low profile, and have excellent broadband performance, which will help realize a low-carbon economy and build an energy-saving and environmentally friendly society, which has great practical significance.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic top view of a low-profile broadband solar cell antenna provided by the present invention;

Figure 2 is a schematic three-dimensional structural diagram of a low-profile broadband solar cell antenna provided by the present invention;

Figure 3 is a relative bandwidth matching diagram obtained through simulation and actual testing using a low-profile broadband solar cell antenna provided by the present invention;

Figure 4 is a radiation pattern obtained through simulation and actual testing using a low-profile broadband solar cell antenna provided by the present invention;

Among them: 1. Upper dielectric board; 2. Solar cell string; 3. Bus strip; 4. Lower dielectric board; 5. Filter; 6. Microstrip line; 7. Slotted floor; 8. Director; 9. DC feeder.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily confusing the concepts of the present invention.

As shown in Figure 1-2, in the embodiment of the present application, the present invention provides a low-profile broadband solar cell antenna, including: an upper dielectric plate 1 and a lower dielectric plate 4 parallel to each other, a radiation structure, a feed structure, a guide filter structure and filter structure; wherein, the radiation structure is located on the upper surface of the upper dielectric plate 1 and is connected to the filter structure through the bus strip 3 and the DC feeder 9. The radiation structure includes parallel and mutually parallel Multiple strings of solar cells 2; the feed structure includes a slotted floor 7 located on the upper surface of the lower dielectric plate 4 and a microstrip line 6 located on the lower surface of the lower dielectric plate. The director structure includes a vertical Two directors 8 are located between the upper dielectric plate 1 and the lower dielectric plate 4 . The filtering structure includes a filter 5 , and the filter 5 is located on the lower surface of the lower dielectric plate 4 .

The invention provides a low-profile broadband solar cell antenna that adopts slot coupling feed form to achieve impedance matching design. Three solar cell strings 2 are parallel to each other, and two adjacent solar cell strings are spaced 3.5 mm apart, forming a 1×2 gap. array. The multiple strings of solar cells 2 are used to convert light energy into electrical energy using solar energy. Both ends of the solar cell string 2 are connected to the bus strip 3 and can transmit the generated electric energy to the bus strip 3 . The bus strip 3 is used to collect and integrate the DC power generated by the solar cell string 2 and transmit the DC power to the signal input end of the filter 5 . One end of the microstrip line 6 can be connected to an external excitation to excite the slotted floor 7 to radiate energy outwards. Since the DC power transmitted from the bus strip 3 may contain a small amount of AC signals, the filter 5 can block this part of the AC signals.

In the embodiment of this application, the thickness of the upper dielectric plate 1 is 0.762 mm.

In the embodiment of this application, the thickness of the lower dielectric plate 4 is 0.7874 mm.

In the embodiment of this application, the air gap between the upper dielectric plate 1 and the lower dielectric plate 4 is 8.1 mm.

In the embodiment of the present application, multiple strings of solar cell strings 2 are arranged at equal intervals, and the lateral distance between any two adjacent strings of solar cell strings 2 is 3.5 mm.

In this embodiment of the present application, the number of solar cell strings 2 is three.

In the embodiment of this application, the size of the solar cell string 2 is 79.75 mm × 40.8 mm.

In this embodiment of the present application, the front and rear ends of multiple strings of solar cell strings 2 are connected in parallel by transversely distributed bus strips 3 .

In the embodiment of the present application, the grooved floor 7 includes two grooves with a size of 7.5 mm×33.7 mm.

In the embodiment of the present application, the guide 8 is composed of two inverted L-shaped copper structures, and the two guides 8 respectively correspond to the center positions of the two slots perpendicular to the grooved floor 7 .

Figures 3 and 4 show various radiation performances of the solar cell antenna using the design method and dimensions described in the present invention. The impedance matching bandwidth of the solar cell antenna using the design method of the present invention is between 1.7GHz and 2.7GHz, with a relative bandwidth of 45%, and a relatively stable gain is maintained in this frequency band. The test gain peak value is 10.5dBi and the average gain is 9dBi. , the radiation pattern conforms to the characteristics of a directional antenna, and the front-to-back ratio of the main polarization is greater than 10dB, which can achieve good directional radiation. For the antenna of the present invention, the measured cross-polarization level is below -15dB. The radiation energy of the E-plane and H-plane of the antenna is mainly concentrated in the normal direction, and has good stability. The radiation pattern maintains good directivity. Can achieve better radiation performance.

Compared with the existing technology, the low-profile broadband solar cell antenna provided by the present invention has the following beneficial effects:

(1) The present invention tiles multiple solar cells to form a battery string with a larger area, thereby improving the distribution rate of the cells and the output voltage of the antenna;

(2) In the present invention, multiple solar cell strings are arranged at equal intervals to form a 1×2 slot array, which can perform directional radiation;

(3) The present invention increases the output current of the solar cell antenna at the DC port by connecting solar cells in series and parallel to meet the requirements of some application environments that cannot provide larger currents;

(4) The antenna of the present invention uses the DC power generated by the photoelectric effect of the solar cell to power the system, which improves the utilization rate of solar energy and helps to realize a low-carbon economy and build an energy-saving and environmentally friendly society;

(5) The present invention realizes the integrated design of solar cell antenna, covering the 1.7GHz to 2.7GHz frequency band, with simple structure and low system complexity, and has practical application and promotion value.

The low-profile broadband solar cell antenna provided by the present invention adds a director to the solar cell antenna, so that the antenna can effectively improve the front-to-back ratio of the solar cell antenna while having green communications, so that it has stable radiation performance; using Multiple strings of solar cells can increase the distribution rate, have low profile, and have excellent broadband performance, which will help realize a low-carbon economy and build an energy-saving and environmentally friendly society, which has great practical significance.

It should be understood that the above-described specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Furthermore, it is intended that the appended claims of the present invention cover all changes and modifications that fall within the scope and boundaries of the appended claims, or equivalents of such scopes and boundaries.

Claims (9)

1. A low-profile broadband solar cell antenna, characterized by comprising: an upper dielectric plate (1) and a lower dielectric plate (4) parallel to each other, a radiation structure, a feed structure, a director structure and a filter structure; wherein , the radiation structure is located on the upper surface of the upper dielectric plate (1), and is connected to the filter structure through bus strips (3) and DC feeders (9). String of solar cells (2); the feed structure includes a slotted floor (7) located on the upper surface of the lower dielectric plate (4) and a microstrip line (6) located on the lower surface of the lower dielectric plate, so The director structure includes two directors (8) vertically located between the upper dielectric plate (1) and the lower dielectric plate (4), and the filtering structure includes a filter (5). The filter (5) is located on the lower surface of the lower dielectric plate (4); wherein, The guide (8) is composed of two inverted L-shaped copper structures, and the two guides (8) respectively correspond to the center positions of the two slots perpendicular to the slotted floor (7). 2. The low-profile broadband solar cell antenna according to claim 1, characterized in that the thickness of the upper dielectric plate (1) is 0.762 mm. 3. The low-profile broadband solar cell antenna according to claim 1, characterized in that the thickness of the lower dielectric plate (4) is 0.7874 mm. 4. The low-profile broadband solar cell antenna according to claim 1, characterized in that the air gap between the upper dielectric plate (1) and the lower dielectric plate (4) is 8.1 mm. 5. The low-profile broadband solar cell antenna according to claim 1, characterized in that multiple strings of the solar cell strings (2) are arranged at equal intervals, and any two adjacent strings of the solar cell strings (2) are The lateral spacing between them is 3.5 mm. 6. The low-profile broadband solar cell antenna according to claim 1, characterized in that the number of the solar cell strings (2) is three. 7. The low-profile broadband solar cell antenna according to claim 1, characterized in that the size of the solar cell string (2) is 79.75 mm×40.8 mm. 8. The low-profile broadband solar cell antenna according to claim 1, characterized in that the front and rear ends of multiple solar cell strings (2) are connected in parallel by transversely distributed bus strips (3). 9. The low-profile broadband solar cell antenna according to claim 1, characterized in that the slotted floor (7) includes two slots with a size of 7.5 mm×33.7 mm.