Compact ultra-wideband antenna

FIELD: radio engineering, communication.

SUBSTANCE: compact ultra-wideband antenna is designed to set up a radio link near the surface of a human body between devices that do not have an unobstructed line of sight, which consists of two symmetric radiating elements situated on one side of a dielectric layer, and a differential strip power supply line situated on both sides of said dielectric layer, the upper and lower sides of which tightly adjoin additional upper and lower dielectric layers, respectively, and two connecting plates with interlayer connections, capable of creating electrical contact between ends of said radiating elements, placed on outer surfaces of said upper and lower dielectric layers; wherein the symmetric radiating elements have recesses at the ends, as well as recesses inside such that the radiating elements are U-shaped, and the radiating elements have additional recesses on their inner and outer periphery.

EFFECT: creating wireless links with low signal attenuation.

6 cl, 3 dwg

 

The invention relates to the field of telecommunications and more specifically to the design of ultra-wideband (UWB) dipole antennas intended primarily for communication between sensors and other devices on the surface or near the surface of the body.

The rapid development of miniature devices with wireless capability, puts more stringent requirements on the size of electronic components. One of the biggest elements of this system is the antenna. At present appear and become popular new wireless standards such as IEEE 802.15.6. They can operate at sufficiently high frequencies (6-10 GHz) and, thus, reduce the physical size of the antenna. However, for a number of devices operating in close proximity to the body, limits on the size of the device are an essential requirement. In this case, you must take additional measures to reduce the size of the antennas used in such devices. In addition, these miniature devices are self-powered and severe restrictions on energy consumption. In this situation, the necessary step is to find ways to minimize energy consumption of each block device.

It is known that the tissues of the body have a compare is Ino high dielectric constant and low conductivity. In these conditions, any electromagnetic waves propagating near the surface of the human body subjected to a severe weakening. However, under certain conditions, electromagnetic waves can travel around the curved surfaces of objects. This phenomenon is called surface waves and is a kind of diffraction. This propagation of electromagnetic waves are minimal attenuation. The conditions for the emergence of such phenomena are: vertical polarization wave relative to the surface of the object, a large value of the dielectric constant of the material of the object, the large size of the object compared to the wavelength.

If the antenna satisfy these conditions, then they can pass the information on the surface of the body, being on different sides of the body and not having a direct pathway. This reduces the power consumption of the transceiver of the radio device.

In the prior art there are various approaches to solving these problems. In particular, U.S. patent No. 7973733 [1] known for the design of antennas designed to transmit and receive UWB signals in miniature devices. In this arrangement, the supply line is located along the main axis of the dipole, which makes the two halves of the dipole are not quite symmetrical. This t is the train leads to the impossibility of creating a curved 3D symmetric structures on both ends of the halves of the dipole. Additionally, this design does not provide additional opportunities to reduce the size of the antenna, such as, for example, a set of inner holes in the radiator and the dielectric coating of the upper and lower sides. These shortcomings do not allow to further reduce the antenna size and to use this antenna in very small devices.

The antenna described in European patent number EP 0301216 [2], was designed to transmit and receive UWB signals. However, this design, like others, is based on this approach, the design has not sufficiently small for placement inside a miniature devices, such as hearing AIDS. In [2] the size of the antenna for the frequency range 2-18 GHz is 54×44×3 mm;

the polarization vector of the signal radiated by the antenna is located along its size 54 mm, and therefore, this antenna can not be used on the surface of the body unnoticed;

- not proposed additional measures aimed at the reduction of dimensions, such as the use of zigzag shapes, additional dielectric layers, etc.

These shortcomings do not allow the use of antenna known from [2], the excitation of surface waves and applications in wireless networks near the surface of the body.

The antenna described in European patent number EP 0889543 [3], is designed to transmit and receive UWB signals and has a high gain and a function of the deflection pattern. The disadvantages known from [3] solutions and others that use a similar approach inventions are as follows:

antenna is not sufficiently small for placement inside a miniature devices, such as hearing AIDS;

- not proposed additional measures aimed at the reduction of dimensions, such as, for example, additional dielectric layers.

These shortcomings do not allow the use of the antenna described in [3], for use in wireless networks near the surface of the body of the person using the propagation of surface waves.

From U.S. patent No. 8264418 [4] known antenna designed to transmit and receive microwave signals. Antenna [4] has in its design managed special keys necessary to switch the operating frequency range. The disadvantages known from [4] solutions and others that use a similar approach inventions are as follows:

antenna is not sufficiently small for placement inside a miniature devices, such as hearing AIDS;

- not proposed additional measures aimed at the reduction of dimensions, such as, for example, additional dielectric layers.

These shortcomings do not allow the use of the antenna described in [4], for use in wireless CE is s near the surface of the body of the person using the propagation of surface waves.

In the patent application of the Republic of Korea # KR 20100013586 [5], which by its characteristics most similar to the claimed invention, the proposed antenna for transmission and reception of microwave signals. This antenna has a high gain directional and designed for communication over long distances. The disadvantages known from [5] solutions and others that use a similar approach inventions are as follows:

- not proposed additional measures aimed at the reduction of dimensions, such as the use of zigzag shapes, additional dielectric layers.

These shortcomings do not allow the use of antenna known from [5] for use in wireless networks near the surface of the body of the person using the propagation of surface waves.

The problem to which the invention is directed, is to develop an improved design SUCH antenna is smaller compared to the prototype [5] sizes, which would create a wireless communication channels on the surface or near the body with low signal attenuation and would provide a significant reduction in the power required by the signal transmitter and receiver sensitivity.

The technical result is achieved due to an improved compact ultra-wide, the band antennas for radio channel near the surface of the body between the devices, no line-of-sight, consisting of two symmetrical radiating elements located on one side of the dielectric layer, the differential strip line power, placed on both sides of the specified dielectric layer, characterized in that:

to the specified dielectric layer with upper and lower sides are flush respectively additional upper and lower dielectric layers, and

two connecting plates with interlayer connections are made with the ability to create electrical contact between the ends of these radiating elements placed on the outer surfaces of these upper and lower dielectric layers; and

these symmetric radiating elements are cut at the ends, and cut inside so that these radiating elements are U-shaped, and

internal and external perimeter of these radiating elements are made additional cuts.

Declare UWB antenna is designed for the implementation of the radio near the surface of the body. It consists of two identical symmetrical radiating elements are U-shaped, and it is powered by differential strip line in the center. In addition, each of the radiating elements has a small plate e is tricesimo connections at the ends. These plates are placed on the outer layers of the antenna and connect with interlayer connections. Two radiating antenna element on one side of the middle dielectric layer and have an elliptical shape. In both the light emitting elements made of elliptical holes in the center so that the radiating elements are U-shaped. In addition, holes are made on the external perimeter of the radiating elements. Differential strip supply line on both sides of the middle of the dialectical layer and connected to the power supply point of the antenna. In addition, the average dielectric layer is placed between two tightly adjacent dielectric layers.

Differential strip line power to the power supply point of the antenna perpendicular to the main plane of symmetry of the antenna. The line width may vary or may have a variable width for better alignment of the antenna.

The inventive antenna is capable of transmitting data using UWB signals of various types, such as ultrashort pulses, signals with linear frequency modulation, various types of noise signals. In addition, it can work as on the body surface and in free space. This allows you to use a single antenna for transmission over the body jot body at the same time.

The inventive antenna refers to the type of UWB-dipoles. In the process of practical implementation of the invention were made some additional improvements aimed at reducing the antenna size. First of all, the antenna has two symmetrical radiating element, made in the shape of the letter U. in Addition, several polugruppovykh cut was made on the inner and outer perimeters of these U-shaped radiating elements, to increase the path of the currents and reduce the size. Also for electrical connection of the ends of each radiating element of the antenna were applied special connecting plate. These plates were placed at some distance from the radiating antenna elements, so as to further increase the path of the currents. In addition to the average dielectric layer placed on it radiating elements, the antenna was covered with an additional dielectric layers from the top and bottom sides. Thanks to these improvements, the antenna size has been greatly reduced. Usually the large antenna size - the diagonal is about λ/3 ... λ/4, where λ is the wavelength. The dimensions of the proposed antenna can be further reduced by choosing a large value of dielectric permittivity additional dielectric layers. Such a compact antenna can be PR is changed in the wireless communication between the miniature devices. For example, at the lowest operating frequency of the antenna to 6.8 GHz, the size can be reduced to 7.1×10,1×1,1 mm

Since the antenna is a dipole design, they do not require additional metal elements for normal operation, such as, for example, a metal grounding from other boards, etc. This is one of the main advantages of the proposed antenna in comparison with antennas monopole.

For a better understanding of the claimed invention, the following is a detailed description with the appropriate drawings.

Figure 1 shows the design of the proposed antenna 100. Figure 1 tagged with: 101 - two radiating antenna element, 102 upper connection plate 103 is lower connection plate, 105 - differential microstrip line power 106 - internal holes in the radiating elements of the antenna 107 to the outer holes in the radiating elements of the antenna 109 - bottom dielectric layer, 108-middle layer dielectric 110 - upper dielectric layer, 104 - intermediate connectors between the connecting plates and radiating antenna elements.

Figure 2 shows a side projection of the claimed antenna 100.

In Fig. 2, type 2.1, shows a section in the plane ZX; figure 2, a view 2.2, in the XY plane, in figure 2, a view of 2.3, in the YZ plane. In figure 2, type 3, marked the point 111 of the feed antenna 100.

Figure 3 shows the frequency head of the dependence of the reflection coefficient S11 of the antenna when installed near the surface of the body. The data are given in the frequency range of 5-10 GHz. Coordination of the antenna, measured by the level of S11<-6 dB is in the range of 6.8-10 GHz and higher frequencies.

Declare UWB antenna 100 (Fig 1) can be used in the composition of miniature devices for transmitting and receiving UWB - radio signals in communication networks operating in close proximity to the surface of the body. To improve performance in such networks, the polarization of the radiated signal must be orthogonal to the body surface. For this reason, the best antenna is vertical, with the Z-axis, located orthogonal to the surface of the body. The inventive antenna 100 may be made of any material for multilayer printed circuit boards, such as FR-4 and other

Since the UWB antenna 100 is made in the form of a flat dipole, for proper operation of this antenna requires no additional layer of metallization from other boards, etc. Antenna 100 has two identical radiating element 101 located mirrored to each other. Both emitting element 101 are external and internal perimeters of the elliptical shape. The shape of the perimeter of the radiating element 101 may also have other simple geometric shape such as a polygon or circle. In addition, the ends of the emitting elements 101 are cut so that they make U-shape./p>

The ends of each radiating element 101 are electrically connected with the external connecting plates 102 and 103 by means of interlayer plated holes 104. These connecting plates 102 and 103 can be in the form of a rectangle. In addition, they may have other simple geometric shape such as a polygon or an ellipse.

The antenna 100 is fed through a differential strip line 105 that runs from the border of the antenna 100 to the signal to it. Line 105 power perpendicular to the main plane of symmetry YZ antenna 100 and runs along the X-axis to the geometric center of the antenna 100. The line width 105 power supply can be changed to match the antenna input resistance of 50 Ohm.

Internal and external perimeters emitting elements 101 are made semicircular cutouts 106 and 107, respectively. These cutouts 106 and 107 are parts of the circle, but they can also have other simple geometric shape such as a polygon or an ellipse. The number of cutouts 106 is chosen arbitrarily, provided that it is ≥2. The number of cutouts 107 is not less than two (≥2).

Emitting elements 101 are placed on one side of the middle dielectric layer 108. In addition, on either side of this average dielectric layer 108 is line 105 power. Each side of the middle dielectric sloa tight to additional dielectric layers 109 and 110. On the outer sides of these additional layers 109 and 110 are connecting plate 103 and 102. The thickness of the dielectric layers 108, 109, 110 can be selected for various adjustments of the antenna 100. The antenna 100 can be placed in the free space inside the device, or it can be outside the body.

Figure 2 (view 2.3) shows the power supply point 111 of the antenna 100. Figure 3 illustrates the operating range of frequencies of the proposed antenna on the example of the frequency dependence of the reflection coefficient. It operating frequency band can be estimated in the field, where the parameter S11<-6 dB. In this case, the frequency band figure 3 is 6,8-10 GHz. In the presented according to the best coordination at a frequency of ~7,7 GHz.

The proposed antenna can be used for wireless communication between devices located next to the body, as well as between devices located on the body and outside the body. The presence of a direct path signal propagation along the body is not required, because the vertical polarization of the radio signal radiated by the antenna, it may spread along the curved surface of the body with little attenuation compared to the distribution within the body. Due to the small size of the antenna can be used in the frequency range required by the IEEE 802.15.6 wireless networks, operating the x near the surface of the body. The device containing the proposed antenna can be small in size, for example, hearing aid, phone, MP3 player etc.

1. Compact ultra-wideband antenna for the organization of the channel near the surface of the body between devices that do not have line-of-sight, consisting of two symmetrical radiating elements located on one side of the dielectric layer, and a differential strip line power, placed on both sides of the specified dielectric layer, characterized in that:
- to the specified dielectric layer with upper and lower sides are flush respectively additional upper and lower dielectric layers, and
two connecting plates with interlayer connections are made with the ability to create electrical contact between the ends of these radiating elements placed on the outer surfaces of these upper and lower dielectric layers; and
- these symmetric radiating elements are cut at the ends, and cut inside so that these radiating elements are U-shaped, and
- internal and external perimeter of these radiating elements are made additional cuts.

2. The antenna according to claim 1, characterized in that the said radiating elements have inner and outer perimeters in the form of simple geometric shapes.

3. The antenna according to claim 1, characterized in that the notches are in the form of simple geometric shapes.

4. The antenna according to claim 1, characterized in that the strip line is perpendicular to the main plane of symmetry of the antenna.

5. The antenna according to claim 1, characterized in that the number of these notches ≥2 both internal and external perimeter of these radiating elements.

6. The antenna according to claim 1, characterized in that the said connecting plates have the form of simple geometric shapes.



 

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