High gain capsule antenna for wireless capsule endoscopy using applied dielectric resonator

Abstract

The application belongs to the technical field of wireless medical devices, and provides a high-gain capsule antenna with an application medium resonator for a wireless capsule endoscope, to solve the problem that the existing wireless capsule endoscope is difficult to maintain stable and high-quality communication between the wireless capsule endoscope in the human body and the external receiving device. The application comprises a capsule shell 1, an antenna body 2 and a medium resonator 3, the antenna body and the medium resonator are arranged inside the capsule shell, the capsule shell is composed of a cylindrical tubular shell and hemispherical shells connected at both ends of the cylindrical tubular shell, the antenna body is arranged in parallel along the circular end face of the cylindrical tubular shell, the medium resonator is arranged above the antenna body and in the same side hemispherical shell, the medium resonator and the antenna body maintain a preset interval, and the electromagnetic waves emitted by the medium resonator to the antenna body are converged. In summary, the medium resonator design can greatly improve the antenna gain, thereby improving the communication quality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wireless medical devices, and specifically designs a high-gain capsule antenna for an application medium resonator of a wireless capsule endoscope. BACKGROUND

[0002] A wireless capsule endoscope (WCE) is an endoscope made in the shape of a capsule, which is a wireless implant device and has been widely used in medical diagnosis and treatment. The wireless capsule endoscope system includes a capsule shell, a battery, an imaging system, a sensor, a signal transmission device, an antenna, etc., wherein the antenna is used to transmit the information such as human body related data and images collected by the capsule from the human body to the receiving device outside the human body, and its performance will greatly affect the quality of information transmission.

[0003] In modern medicine, the common examination method for the digestive tract is a wired endoscope system, but the wired endoscope system is complex to operate and involves medical problems such as cross infection, which causes pain to the patient and cannot achieve full examination of the digestive tract. The wireless capsule endoscope can enter the human body through oral administration, move in the body through gastrointestinal peristalsis and be discharged, has the ability to examine the full digestive tract of small intestine and other parts, and avoids causing pain to the patient and overcomes the defects of the traditional endoscope which is not suitable for the elderly and seriously ill. However, the environment of the human digestive tract is complex, and the electrical properties of various organs differ greatly. When the wireless capsule endoscope with a traditional low-gain capsule antenna moves in the digestive tract, the change of the surrounding environment will make the information transmission between the wireless capsule endoscope and the external receiving device unstable, affecting the normal work of the wireless endoscope system. In short, the current wireless capsule endoscope is difficult to maintain stable and high-quality communication between the wireless capsule endoscope in the human body and the external receiving device, and therefore the application provides a high-gain capsule antenna for an application medium resonator of a wireless capsule endoscope. SUMMARY

[0004] The purpose of the application is to provide a high-gain capsule antenna for an application medium resonator of a wireless capsule endoscope, which solves the problem that the current wireless capsule endoscope is difficult to maintain stable and high-quality communication between the wireless capsule endoscope in the human body and the external receiving device.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the application is as follows:

[0006] The application discloses a high-gain capsule antenna of an application medium resonator for a wireless capsule endoscope, which comprises a capsule shell 1, an antenna body 2 and a medium resonator 3; the antenna body and the medium resonator are arranged in the capsule shell; the capsule shell is composed of a cylindrical tubular shell and hemispherical shells connected at two ends of the cylindrical tubular shell; the antenna body is arranged in parallel along a circular end surface of the cylindrical tubular shell; the medium resonator is arranged above the antenna body and in the same side hemispherical shell; the medium resonator and the antenna body are kept at a preset interval; electromagnetic waves are emitted from the medium resonator to the antenna body to realize convergence.

[0007] Further, the medium resonator comprises a central medium cylinder and a plurality of medium cylinders; the central medium cylinder is arranged along a central axis of the capsule shell; and the plurality of medium cylinders are arranged in sequence and nested outside the central medium cylinder.

[0008] Further, in the medium resonator, the dielectric constant of the medium layer is increased or decreased in sequence from the central medium cylinder outward, and the height of the medium layer is decreased in sequence.

[0009] Further, the medium resonator is in a hemispherical or spherical shape.

[0010] Further, the antenna body comprises a medium substrate 2-1, a radiation metal layer 2-2 and a ground metal layer 2-3; the radiation metal layer is arranged on the front surface of the medium substrate and faces the medium resonator; the ground metal layer is arranged on the back surface of the medium substrate; and the medium substrate is arranged in parallel along the circular end surface of the cylindrical tubular shell.

[0011] Further, the radiation metal layer comprises a metal strip 2-2-1 and a feed microstrip line 2-2-2; the radiation metal layer is in a 180° rotational symmetry structure along the central point of the front surface of the medium substrate; the metal strip is in a plane Hilbert fractal structure; the plane Hilbert fractal structure is composed of four second-order Hilbert fractal units connected to each other, and two free ends of the metal strip are connected to the feed microstrip line respectively.

[0012] Further, the metal strip is arranged in a double-layer mode.

[0013] Based on the above technical scheme, the application has the following beneficial effects:

[0014] The application discloses a high-gain capsule antenna of an application medium resonator for a wireless capsule endoscope, which comprises a capsule shell 1, an antenna body 2 and a medium resonator 3; the antenna body and the medium resonator are arranged in the capsule shell; the capsule shell is composed of a cylindrical tubular shell and hemispherical shells connected at two ends of the cylindrical tubular shell; the antenna body is arranged in parallel along a circular end surface of the cylindrical tubular shell; the medium resonator is arranged above the antenna body and in the same side hemispherical shell; the medium resonator and the antenna body are kept at a preset interval; electromagnetic waves are emitted from the medium resonator to the antenna body to realize convergence. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1This is a schematic diagram of the high-gain capsule antenna for use in wireless capsule endoscopes provided by the present invention, wherein 1 is the capsule shell, 2 is the antenna body, and 3 is the dielectric resonator.

[0016] Figure 2 for Figure 1 The diagram shows the structure of the antenna body in the high-gain capsule antenna using a dielectric resonator, where 2-1 is the dielectric substrate 2-1, 2-2 is the radiating metal layer, and 2-3 is the grounding metal layer 2-3.

[0017] Figure 3 for Figure 2 The diagram shows the structure of the radiating metal layer in the antenna body, where 2-2-1 is a metal strip and 2-2-2 is a feed microstrip line.

[0018] Figure 4 for Figure 1 The diagram shows the structure of the dielectric resonator in the high-gain capsule antenna using a dielectric resonator, where 3-1 is the central dielectric cylinder, 3-2 is the first dielectric cylinder, and 3-3 is the second dielectric cylinder.

[0019] Figure 5 This is a schematic diagram of the spherical dielectric resonator in an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the capsule antenna structure in the comparative example provided by the present invention.

[0021] Figure 7 The figure shows the S-parameter simulation results of the high-gain capsule antenna using a dielectric resonator in an embodiment of the present invention.

[0022] Figure 8 The figure shows the gain simulation results of the high-gain capsule antenna using a dielectric resonator in an embodiment of the present invention.

[0023] Figure 9 The figure shows the simulation results of the capsule antenna in the comparative example. Detailed Implementation

[0024] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] This embodiment provides a high-gain capsule antenna with an application dielectric resonator for wireless capsule endoscopy, the structure of which is as follows: Figure 1 As shown, it includes: capsule shell 1, antenna body 2 and dielectric resonator 3;

[0026] The capsule shell 1 is composed of a cylindrical tubular shell and hemispherical shells connected at both ends of the cylindrical tubular shell, and the axis of the central axis of the cylindrical tubular shell is defined as the central axis of the capsule shell.

[0027] The antenna body 2 and the dielectric resonator 3 are arranged inside the capsule shell, the antenna body 2 is arranged in parallel along the circular end face of the cylindrical tubular shell, and the dielectric resonator 3 is arranged above the antenna body 2 and in the same side hemispherical shell, the dielectric resonator 3 and the antenna body 2 maintain a predetermined distance, and the electromagnetic wave emitted by the dielectric resonator to the antenna body realizes convergence.

[0028] The antenna body, as shown in Figure 2 The antenna body, as shown in Figure 2 The antenna body, as shown in

[0029] The antenna body, as shown in Figure 3 The antenna body, as shown in Figure 3 The antenna body, as shown in

[0030] The antenna body, as shown in Figure 4 The antenna body, as shown in Figure 4 The antenna body, as shown in

[0031] Based on the above high-gain capsule antenna, in addition, it should be noted that:

[0032] Firstly, the wireless capsule endoscope also comprises a light source, an imaging element, a sensor, a battery, a transceiver module and other elements inside the capsule shell, as prior art known in the art, the present application will not be described in detail, Figure 1 and Figure 5 not shown in the present application; and the present application arranges the antenna body 2 and the dielectric resonator 3 conformally in the hemispherical shell on one side of the capsule shell, which significantly reduces the space occupied by the antenna inside the capsule, so that the capsule has a larger internal space for placing other elements.

[0033] Secondly, the present application designs the structure of the dielectric resonator 3 so that the outer contour of the dielectric resonator 3 is spherical, thereby realizing conformal design with the capsule shell; according to the actual use environment and assembly space design, the dielectric resonator 3 in the present embodiment is in the shape of a hemispherical body, as shown in Figure 4 , and under other use environment and assembly space design, the dielectric resonator 3 can also be in the shape of a spherical body, as shown in Figure 5 ;

[0034] Thirdly, according to the task index requirements under the actual application scenario, the total length of the metal strip 2-2-1 of the radiating metal layer 2-2 of the antenna body 2 is determined by the working wavelength, and the layout of the metal strip can be adaptively designed; and the length of the feed microstrip line at both ends can be matched and adjusted, one end is fed through the microstrip line, and the other end is connected to a matching load to reduce the reflection of electromagnetic waves; at the same time, according to the task index requirements under the actual application scenario, the distance between the dielectric resonator and the antenna body can be simulated and optimized to obtain a suitable gain; based on this, the working frequency band of the antenna is determined by the total length of the metal strip 2-2-1, and the electromagnetic wave emitted by the antenna body is converged by the dielectric resonator to obtain higher gain, thereby realizing the purpose of higher communication quality.

[0035] The beneficial effects of the present application will be described in detail in combination with simulation tests, in order to more intuitively illustrate the core creativity of the present application, the present application also provides a comparative example, the structure of which is as follows Figure 6The only difference between the capsule antenna in the comparative example and the present embodiment is that the medium resonator is not included; specifically, the high-gain capsule antenna based on the medium resonant cavity in the present embodiment works in the industrial, scientific and medical (ISM) band (2.4 GHz), wherein the medium substrate adopts Rogers 5880 with a relative dielectric constant of 2.2, a long side size of 8.05 mm and a short side size of 6.65 mm; the height of the center medium cylinder of the medium resonator is 5.12 mm, the radius is 2 mm, and the relative dielectric constant is 5; the height of the first medium cylinder in the medium resonant cavity is 3.77 mm, the outer radius is 4 mm, the inner radius is 2 mm, and the relative dielectric constant is 25; the height of the second medium cylinder in the medium resonant cavity is 2.29 mm, the outer radius is 5 mm, the inner radius is 4 mm, and the relative dielectric constant is 50; the interval between the medium resonator and the antenna body is 0.473 mm; the simulation test is performed on the capsule antenna in the comparative example and the present embodiment, and the results are as follows:

[0036] As shown in Figure 7 the S-parameter diagram of the high-gain capsule antenna based on the medium resonator in the present embodiment, it can be seen from the diagram that S11 reaches -44.75 dB at 2.4 GHz; as shown in Figure 8 the gain diagram (φ = 90°) of the high-gain capsule antenna based on the medium resonator in the present embodiment, as shown in Figure 9 the gain diagram (φ = 90°) of the capsule antenna in the comparative example, it can be seen from the diagram that the maximum gain of the high-gain capsule antenna based on the medium resonator in the present embodiment increases from -21.98 dB to -14.7 dB, and it can be seen that the medium resonator can greatly improve the antenna gain.

[0037] The above is only a specific embodiment of the present application, and any feature disclosed in the specification can be replaced by other equivalent or similar purpose alternative features unless specifically described; all features disclosed, or steps in all methods or processes, except mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A high-gain capsule antenna for use with a dielectric resonator in a wireless capsule endoscope, comprising: The capsule shell (1), antenna body (2), and dielectric resonator (3) are characterized in that the antenna body and the dielectric resonator are both disposed inside the capsule shell, the capsule shell is composed of a cylindrical tubular shell and a hemispherical shell connected at both ends, the antenna body is arranged parallel to the circular end face of the cylindrical tubular shell, the dielectric resonator is disposed above the antenna body and located in the hemispherical shell on the same side, the dielectric resonator and the antenna body maintain a preset distance, and the dielectric resonator emits electromagnetic waves to the antenna body to achieve convergence; the dielectric resonator includes: a central dielectric cylinder and several dielectric cylinders, the central dielectric cylinder is arranged along the central axis of the capsule shell, and several dielectric cylinders are nested in sequence outside the central dielectric cylinder; in the dielectric resonator, from the central dielectric cylinder outward, the dielectric constant of the dielectric layer increases or decreases in sequence, and the height of the dielectric layer decreases in sequence.

2. The high-gain capsule antenna for a wireless capsule endoscope using an application dielectric resonator according to claim 1, characterized in that, The dielectric resonator is hemispherical or spherical in shape.

3. The high-gain capsule antenna for a wireless capsule endoscope using an application dielectric resonator according to claim 1, characterized in that, The antenna body includes: a dielectric substrate (2-1), a radiating metal layer (2-2), and a grounding metal layer (2-3); the radiating metal layer is disposed on the front side of the dielectric substrate and faces the dielectric resonator, the grounding metal layer is disposed on the back side of the dielectric substrate, and the dielectric substrate is disposed parallel to the circular end face of the cylindrical tubular shell.

4. The high-gain capsule antenna for a wireless capsule endoscope using an application dielectric resonator according to claim 3, characterized in that, The radiating metal layer includes a metal strip (2-2-1) and a feed microstrip line (2-2-2). The radiating metal layer has a 180° rotationally symmetrical structure along the center point of the front side of the dielectric substrate. The metal strip has a planar Hilbert fractal structure. The planar Hilbert fractal structure is composed of four second-order Hilbert fractal units connected together, and the two free ends are respectively connected to the feed microstrip line.

5. The high-gain capsule antenna for a wireless capsule endoscope using an application dielectric resonator according to claim 4, characterized in that, The metal strips are arranged in a double layer.

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