CN210430101U

CN210430101U - Dual-frequency broadband implanted antenna loaded with complementary open-ended resonant single ring

Info

Publication number: CN210430101U
Application number: CN201921388548.2U
Authority: CN
Inventors: 刘雄英; 徐超
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-04-28
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses a loading complementary open resonator monocycle dual-frenquency broadband implanted antenna, including upper dielectric substrate, lower floor's dielectric substrate, short circuit probe, metal radiating element, feed and floor, metal radiating element is located between upper dielectric substrate and the lower floor's dielectric substrate, and the floor is located the lower surface of lower floor's dielectric substrate, metal radiating element with the floor passes through short circuit probe connects, the feed is located between metal radiating element and the floor. The utility model has the advantages of small size, double-frequency impedance bandwidth broad and the like.

Description

Dual-frequency broadband implanted antenna loaded with complementary open-ended resonant single ring

Technical Field

The utility model relates to a biomedical telemetering measurement field, concretely relates to loading complementary opening resonance monocycle's dual-frenquency broadband implanted antenna.

Background

With the continuous improvement of social medical services and technical levels, wireless implantable medical equipment is widely applied in the aspects of body temperature and intracranial pressure measurement, heart rate and blood sugar level monitoring and the like. The doctor can break through the limit of time and space range through the implanted medical equipment and remotely provide diagnosis and treatment services for patients. The antenna is used as a key device for wireless data transmission between the implantable medical device and the external device, and the design and the actual performance of the antenna face a plurality of challenges due to the complex human tissue environment.

According to the related regulations of the Federal Communications Commission (FCC), 902-. At present, most implantable medical equipment is powered by a battery, and is mostly single-frequency, but the antenna with the single-frequency characteristic cannot well realize the switching between the sleep mode and the wake-up mode of the equipment, so that the equipment is always in a working mode with higher power consumption, and the service life of the battery is shortened. In the research of the current implantable antenna, the actual performance of the antenna is easy to generate frequency offset due to the complexity of the implanted human body environment, and the implantable antenna with a narrow bandwidth is easy to deviate from the required working frequency band in practical application.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of current biomedical telemetering measurement antenna technique, the utility model provides a loading complementary opening resonance monocycle's dual-frenquency broadband implanted antenna.

The purpose of the utility model is realized through one of following technical scheme at least.

A dual-frequency broadband implanted antenna loaded with a complementary open-loop resonant single ring comprises an upper dielectric substrate, a lower dielectric substrate, a short-circuit probe, a metal radiation unit, a feed source and a floor, wherein the metal radiation unit is located between the upper dielectric substrate and the lower dielectric substrate, the floor is located on the lower surface of the lower dielectric substrate, the metal radiation unit is connected with the floor through the short-circuit probe, and the feed source is located between the metal radiation unit and the floor.

Furthermore, the metal radiation unit is composed of a middle rectangular patch and three meandering metal branches led out from the lower part.

Furthermore, a slot is formed in the center of the middle rectangular patch to form an open resonant single ring, the open resonant single ring is of a rectangular ring structure, and a rectangular gap opening is formed in the center above the rectangular ring.

Further, the metal branch knot comprises a rectangular metal branch knot, a right L-shaped metal branch knot and a left L-shaped metal branch knot, the right L-shaped metal branch knot is located at the upper right of the middle rectangular patch, the left L-shaped metal branch knot is located at the lower left of the middle rectangular patch, and the rectangular metal branch knot is located below the middle rectangular patch.

Furthermore, the short circuit probe connects the metal branch section positioned below the middle rectangular patch in the three metal branch sections with the floor through the lower dielectric substrate.

Furthermore, the feed source is a coaxial feed, and the coaxial feed is positioned on the central line of the antenna.

Furthermore, the upper layer dielectric substrate and the lower layer dielectric substrate are in rectangular layered structures, and the floor is in a rectangular structure.

Furthermore, the upper dielectric substrate, the lower dielectric substrate and the floor are the same in size, and the upper dielectric substrate and the lower dielectric substrate are made of the same material.

The utility model has the advantages that:

the utility model can add resonance points under limited size by loading complementary open resonance single ring, and the three metal branches are divided into multiple current paths, and multiple resonance points can be generated, and the effect of bandwidth expansion can be achieved by adjusting the multiple resonance points to approach each other; the loading of the short-circuit probe greatly reduces the resonant frequency, the meandering structure of the three metal branches prolongs the current path, and the short-circuit probe has the effect of reducing the size of the antenna; the impedance bandwidth of the antenna covers two frequency bands, and a plurality of working modes can be realized, so that the power consumption of the implanted medical equipment is reduced; by adopting the complete floor structure, the electromagnetic interference of other elements of the equipment is reduced, and meanwhile, the radiation hazard of the antenna to the human body is reduced.

Drawings

Fig. 1 and fig. 2 are a top view and a side view of a dual-band broadband implantable antenna loaded with a complementary split-resonance single loop according to the present invention;

FIG. 3 is a three-layer human tissue model simulation environment diagram of the dual-band broadband implantable antenna with a complementary split resonant single ring loaded;

FIG. 4 shows the reflection coefficient S of the dual-band broadband implantable antenna loaded with a complementary split resonant single ring₁₁A graph;

fig. 5 is a radiation pattern of the XOZ and YOZ planes of the dual-band broadband implanted antenna loaded with a complementary split resonant single ring of the present invention at the frequency point of 915 MHz;

fig. 6 is the gain pattern of the XOZ and YOZ planes at the 2.45 GHz frequency point for a dual-band broadband implanted antenna loaded with a complementary split resonant single loop of the present invention;

the figures show that: 1A-an upper layer dielectric substrate, 1B-a lower layer dielectric substrate, 2-a short-circuit probe, 3-a feed source, 4-a metal radiation unit, 5-a floor, 6A-a rectangular patch, 6B-an open resonant single ring, 7-a rectangular metal branch, 8-a right L-shaped metal branch and 9-a left L-shaped metal branch.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Examples

As shown in fig. 1 and 2, a dual-frequency broadband implantable antenna loaded with a complementary open-ended resonant single loop comprises upper and lower

dielectric substrates

1A and 1B, a short-circuit probe 2, a metal radiating unit 4, a feed source 3 and a floor 5, wherein the metal radiating unit 4 is arranged between the upper and lower

dielectric substrates

1A and 1B, the floor 5 is arranged on the lower surface of the lower dielectric substrate 1B, the metal radiating unit 4 is connected with the floor 5 through the short-circuit probe 2, the metal radiating unit 4 is composed of a rectangular patch with a groove in the middle and three meandering metal branches, and the antenna is implanted in a three-layer human tissue model for simulation.

The metal radiation unit 4 is formed by connecting a rectangular patch 6A after being grooved with three metal branches 7, 8 and 9, and the maximum length and width of the outer side of the metal radiation unit 4 are respectively Lb =7.9mm and La1=7.7 mm. The rectangular patch 6A has a length and a width of L1=6.8 mm and L2=5.7 mm, respectively, the slot is formed in the center of the rectangular patch to form an open resonant single loop 6B, the open resonant single loop 6B is a rectangular loop structure with an open gap above, the outer rectangular length and width of the rectangular loop structure are L3= 5mm and L4=3.65 mm, respectively, the loop width of the rectangular loop structure is d1=0.8 mm, the width d2=0.15 mm of the central opening above the open resonant single loop 6B is symmetrical about the center line of the metal radiating element 4. The distance d5=0.35mm above the outer edge of the open resonant single loop 6B from the upper edge of the rectangular patch 6A.

The three metal branches 7, 8, 9 are wound around the rectangular patch 6A, the width of the joint with the rectangular patch 6A is d3=0.35mm, the length of the rectangular metal branch 7 is L5=5.6mm, the width is w2=0.5mm, the rectangular metal branch is connected to the floor 5 through the short-circuit probe 2, the diameter of the short-circuit probe is 0.4mm, and the distance from the center of the circle to the end of the rectangular metal branch 7 is a =0.65 mm. The right L-shaped metal branch 8 is in an L-shaped strip shape, the bending point is located at the upper right corner of the metal radiation unit 4, the lengths of the horizontal part and the vertical part are La1=7.7mm and La2=7mm, the widths of the horizontal part and the vertical part are w1=0.55mm and w4=0.2mm respectively, and the distance between the lower part of the horizontal part of the right L-shaped metal branch 8 and the upper part of the rectangular patch 6A is d4=0.5 mm. The left L-shaped metal branch 9 is also a L-shaped serpentine strip, located at the lower left of the rectangular patch 6A, and has vertical and horizontal portions of length L6=3.8mm and L7=3.675mm, and width w3=0.2 mm.

The utility model discloses the sculpture has opening resonance monocycle on the radiating element, can produce a plurality of resonance points, improves impedance matching. And the effective current path on the surface of the metal radiating unit can be prolonged by connecting the three winding metal branches, so that a plurality of resonance points are increased while the small size is kept, and the impedance bandwidth of the antenna is widened.

The upper dielectric substrate 1A and the lower dielectric substrate 1B are rectangular laminated structures; the floor panel 5 has a rectangular configuration with a length and width of Lb =7.9mm and La1=7.7mm, respectively.

The utility model discloses except the round hole of feed position, do not have fluting and gap on the floor 5, be favorable to reducing the electromagnetic interference that antenna performance received other components and parts, reduce the radiation harm of antenna to the human body simultaneously.

The feed source 3 is coaxial feed, the coaxial feed is arranged between the metal radiation unit 4 and the floor 5 and on the central line of the antenna, the distance between the circle center of the joint of the coaxial feed source and the metal radiation unit 4 and the edge below the metal radiation unit 4 is b =2.8mm, and the diameter of the coaxial inner core is 0.7 mm.

The short circuit probe 2 connects the rectangular metal branch 7 with the floor 5, so that the resonant frequency of the antenna can be greatly reduced, and the size of the antenna is reduced. The short circuit probe 2 is positioned in the lower dielectric substrate 1B. The diameter of the short circuit probe 2 is 0.4mm, and the distance between the circle center and the tail end of the rectangular metal branch 7 is a =0.65 mm.

The upper dielectric substrate 1A covers the metal radiation unit 4, the substrate material is RogersRo3210, the relative dielectric constant is 10.2, the loss tangent is 0.003, and the high-dielectric-constant material is favorable for reducing the size of the antenna. The upper dielectric substrate 1A has the same length and width as the floor 5, and has Lb =7.9mm, La1=7.7mm, and a thickness of 0.635mm, respectively. The lower dielectric substrate 1B is located between the metal radiation unit 4 and the floor 5, and has the same material properties and size as the upper dielectric substrate 1A.

The antenna is implanted into the three-layer human tissue model for simulation, the three-layer human tissue model is of a cuboid structure, as shown in figure 3, the three-layer human tissue model sequentially comprises a skin layer, a fat layer and a muscle layer from top to bottom, and the electromagnetic parameters such as the relative dielectric constant and the conductivity of the three-layer human tissue model are different due to the change of the frequency.

As shown in fig. 3, the thicknesses of the skin, fat and muscle layers are respectively 4mm, 4mm and 60mm, the antenna is implanted at dp =4mm below the muscle layer, and the distance between the antenna and the periphery of the model is 60 mm. When the frequency is 915 MHz, the relative dielectric constants of the skin, fat and muscle layers are 41.3, 5.46 and 55 respectively, and the electric conductivities are 0.87S/m, 0.051S/m and 0.948S/m respectively; when the frequency is 2.45 GHz, the relative dielectric constants of skin, fat and muscle layers are respectively 38, 5.28 and 52.72, and the electric conductivities are respectively 1.464S/m, 0.104S/m and 1.739S/m.

As shown in FIG. 4, the antenna is placed in a three-layer human tissue model for simulation, and the reflection coefficient S₁₁The frequency ranges less than-10 dB are 670-1050MHz (380 MHz) and 2.10-2.94 GHz (840 MHz), which covers the 902-928MHz and 2.40-2.48 GHz frequency bands in ISM, and the relative bandwidths reach 44.2% and 33.3%, respectively.

As shown in fig. 5 and 6, the radiation patterns of the XOZ and YOZ planes at two frequency points of 915 MHz and 2.45 GHz are for the antenna to be implanted in a three-layer human tissue model. The peak gains of the antenna at 915 MHz and 2.45 GHz are-36 dBi and-30 dBi respectively.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. The utility model provides a load complementary opening resonance monocycle's dual-frenquency broadband implanted antenna, its characterized in that includes upper dielectric substrate (1A), lower floor dielectric substrate (1B), short circuit probe (2), metal radiating element (4), feed (3) and floor (5), metal radiating element (4) are located between upper dielectric substrate (1A) and lower floor dielectric substrate (1B), and floor (5) are located the lower surface of lower floor dielectric substrate (1B), metal radiating element (4) with floor (5) pass through short circuit probe (2) are connected, feed (3) are located between metal radiating element (4) and floor (5).

2. The dual-frequency broadband implantable antenna according to claim 1, wherein the metallic radiating element (4) is composed of a central rectangular patch (6A) and three meandering metallic branches led below.

3. The dual-frequency broadband implantable antenna according to claim 2, wherein the middle rectangular patch (6A) is slotted at the center to form an open-ended resonant single loop (6B), the open-ended resonant single loop (6B) is a rectangular ring structure, and a rectangular slot opening is formed at the center above the open-ended resonant single loop (6B).

4. The dual-frequency broadband implantable antenna according to claim 2, wherein the metal branches comprise a rectangular metal branch (7), a right L-shaped metal branch (8) and a left L-shaped metal branch (9), the right L-shaped metal branch (8) is located at the upper right of the middle rectangular patch (6A), the left L-shaped metal branch (9) is located at the lower left of the middle rectangular patch (6A), and the rectangular metal branch (7) is located below the middle rectangular patch (6A).

5. The dual-frequency broadband implantable antenna according to claim 4, wherein the rectangular metal stub (7) is connected with the floor (5) through a short-circuit probe (2), and the short-circuit probe (2) is located in the lower dielectric substrate (1B).

6. The dual-frequency broadband implantable antenna according to claim 1, wherein the feed (3) is a coaxial feed and is coaxially located on the center line of the antenna.

7. The dual-frequency broadband implantable antenna according to claim 1, wherein the upper dielectric substrate (1A) and the lower dielectric substrate (1B) are rectangular laminated structures, and the floor (5) is a rectangular structure.

8. The dual-frequency broadband implantable antenna according to claim 1, wherein the upper dielectric substrate (1A), the lower dielectric substrate (1B) and the floor (5) are the same in size, and the upper dielectric substrate (1A) and the lower dielectric substrate (1B) are made of the same material.