Ultra-wideband antenna for breast tumor and regional lymph node positioning

Abstract

The invention provides an ultra-wideband antenna for breast tumor and regional lymph node positioning. The ultra-wideband antenna comprises a dielectric substrate, a transmitting antenna, a receiving antenna, a ceramic dielectric plate, a feed unit and a circuit board. The dielectric substrate comprises a first through hole and a second through hole which are oppositely arranged along a first direction, and a third through hole and a fourth through hole which are oppositely arranged along a second direction. The transmitting antenna and the receiving antenna are attached to the first side of the dielectric substrate, the transmitting antenna comprises a first transmitting arm and a second transmitting arm which are symmetrically arranged at intervals in the first direction, and the receiving antenna comprises a first receiving arm and a second receiving arm which are symmetrically arranged at intervals in the second direction. The ceramic dielectric plate covers the transmitting antenna and the receiving antenna from the sides, away from the dielectric substrate, of the transmitting antenna and the receiving antenna. The feed unit is located on the second side of the dielectric substrate and electrically connected with the first transmitting arm and the second transmitting arm through the first through hole and the second through hole respectively. The circuit board is arranged on the second side of the dielectric substrate and electrically connected with the first receiving arm and the second receiving arm through the third through hole and the fourth through hole respectively.

Description

Technical Field

[0001] This application relates to the technical field of antenna design, and particularly to an ultra-wideband antenna for breast tumor and regional lymph node localization. Background Art

[0002] At present, the common clinical breast cancer detection methods are as follows: X-ray imaging examination, ultrasonic imaging examination, magnetic resonance imaging examination, etc. All of the detection means introduced above have their own advantages and disadvantages. However, the equipment manufacturing costs of these detection technologies are high, and most of them are bulky, which greatly limits the detection location and the positioning difficulty during surgery. Therefore, researchers hope to develop a new detection technology that can reduce the manufacturing cost of related equipment and the volume of the detection equipment without reducing the detection accuracy, so as to make it suitable for portable use. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide an ultra-wideband antenna for breast tumor and regional lymph node localization, so as to realize the miniaturization of the ultra-wideband antenna, make it suitable for portable use, and be convenient to be arranged on the human skin. The specific technical solutions are as follows:

[0004] This application provides an ultra-wideband antenna for breast tumor and regional lymph node localization, including: a dielectric substrate including a first through hole and a second through hole oppositely arranged along a first direction and a third through hole and a fourth through hole oppositely arranged along a second direction, where the first direction and the second direction intersect; a transmitting antenna and a receiving antenna, which are attached to the first side of the dielectric substrate, the transmitting antenna includes a first transmitting arm and a second transmitting arm symmetrically arranged at intervals along the first direction, and the receiving antenna includes a first receiving arm and a second receiving arm symmetrically arranged at intervals along the second direction; a ceramic dielectric plate, which is attached to the side of the transmitting antenna and the receiving antenna away from the dielectric substrate, and the ceramic dielectric plate covers the transmitting antenna and the receiving antenna; a feeding unit, located on the second side of the dielectric substrate, and electrically connected to the first transmitting arm and the second transmitting arm through the first through hole and the second through hole respectively; a circuit board, arranged on the second side of the dielectric substrate, and electrically connected to the first receiving arm and the second receiving arm through the third through hole and the fourth through hole respectively.

[0005] In some embodiments, the first direction is perpendicular to the second direction; the circuit board is perpendicularly arranged with respect to the dielectric substrate and parallel to the second direction.

[0006] In some embodiments, the center of the interval between the first transmitting arm and the second transmitting arm is the center of the dielectric substrate, and the center of the interval between the first receiving arm and the second receiving arm is the center of the dielectric substrate.

[0007] In some embodiments, the first gap between the first transmitting arm and the second transmitting arm is 1 mm - 1.5 mm; the second gap between the first receiving arm and the second receiving arm is 1 mm - 1.5 mm.

[0008] In some embodiments, the cross-section of the first transmitting arm and the second transmitting arm along their thickness direction is an isosceles triangle or an isosceles trapezoid, the cross-section of the first receiving arm and the second receiving arm along the thickness direction is an isosceles triangle or an isosceles trapezoid, and the apex angle of the isosceles triangle or the upper base of the isosceles trapezoid is the end close to the center of the dielectric substrate.

[0009] In some embodiments, the widths of the first transmitting arm, the second transmitting arm, the first receiving arm, and the second receiving arm are 4 mm - 5 mm, and the lengths of the first transmitting arm, the second transmitting arm, the first receiving arm, and the second receiving arm are 7 mm - 9 mm.

[0010] In some embodiments, on the side of the first transmitting arm and the second transmitting arm close to the dielectric substrate, there are respectively a first wiring node opposite to the first through hole and a second wiring node opposite to the second through hole, and the first wiring node and the second wiring node are located at the ends of the first transmitting arm and the second transmitting arm close to the center of the dielectric substrate. On the second side of the dielectric substrate, there are a first connection line and a second connection line electrically connected to the feeding unit. The first connection line and the second connection line are respectively electrically connected to the first wiring node and the second wiring node through the first through hole and the second through hole; on the side of the first receiving arm and the second receiving arm close to the dielectric substrate, there are respectively a third wiring node opposite to the third through hole and a fourth wiring node opposite to the fourth through hole, and the third wiring node and the fourth wiring node are located at the ends of the first receiving arm and the second receiving arm close to the center of the dielectric substrate. The third wiring node and the fourth wiring node are respectively electrically connected to the circuit board through the third through hole and the fourth through hole.

[0011] In some embodiments, the first through hole, the second through hole, the third through hole, and the fourth through hole are circumferentially and uniformly distributed around the center of the dielectric substrate. The first distance between the first through hole and the second through hole is 1 mm - 2 mm, and the second distance between the third through hole and the fourth through hole is 1 mm - 2 mm.

[0012] In some embodiments, the circuit board includes a third connection line and a fourth connection line, the third connection line and the fourth connection line are electrically connected to the first receiving arm and the second receiving arm respectively; the third connection line and the fourth connection line are in an "L" shape, the third connection line includes a first horizontal section and a first vertical section, the first horizontal section is perpendicular to the dielectric substrate and opposite to the third through hole, the first vertical section extends in a direction close to the central extension line of the dielectric substrate, the fourth connection line includes a second horizontal section and a second vertical section, the second horizontal section is perpendicular to the dielectric substrate and opposite to the fourth through hole, the second vertical section extends in a direction close to the central extension line of the dielectric substrate; the orthographic projections of the first connection line and the second connection line on the dielectric substrate are within the orthographic projection range of the transmitting antenna on the dielectric substrate, and the orthographic projections of the third connection line and the fourth connection line on the dielectric substrate are within the orthographic projection range of the receiving antenna on the dielectric substrate.

[0013] In some embodiments, the ceramic dielectric plate is in a cross shape, and the covering area of the ceramic dielectric plate is greater than or equal to the area of the surfaces of the transmitting antenna and the receiving antenna on the side away from the dielectric substrate; the feeding unit includes a coaxial cable, and the inner conductor and the outer conductor of the coaxial cable are electrically connected to one of the first transmitting arm and the second transmitting arm respectively; the side of the circuit board close to the dielectric substrate has an opening for the coaxial cable to pass through.

[0014] In some embodiments, the volume of the ultra-wideband antenna is (19 mm - 22 mm) × (19 mm - 22 mm) × (12 mm - 15 mm); the thickness of the ceramic dielectric plate is 2 mm - 4 mm, and the thickness of the dielectric substrate is 0.3 mm - 1 mm.

[0015] Advantageous effects of the embodiments of the present application:

[0016] The ultra-wideband antenna provided by the embodiment of the present application for breast tumor and regional lymph node localization includes both a transmitting antenna and a receiving antenna. The transmitting antenna and the receiving antenna are arranged crosswise. The two transmitting arms between the transmitting antennas are diagonally distributed, and the two receiving arms of the receiving antenna are diagonally distributed. By increasing the distance between each other, the transceiver isolation degree of the transmitting antenna and the receiving antenna can be maintained, so that signals can be transmitted and received simultaneously. The transmitting antenna includes two transmitting arms, and the receiving antenna also includes two receiving arms. Therefore, the transmitting antenna and the receiving antenna can transmit differential signals, and the amplitudes of these two signals are the same and the phases are opposite. The differential signal transmits the original signal and its reverse signal simultaneously, and the receiving end restores the original signal by comparing the differences between these two signals. This method can effectively eliminate common-mode noise, thereby improving the quality and stability of the signal. That is to say, the differential signal has strong anti-interference ability. Moreover, the differential signal transmission method greatly reduces electromagnetic radiation and energy loss, so it can save system power consumption and is more suitable for long-distance transmission. By loading a ceramic dielectric plate, on the one hand, the ceramic dielectric plate is used to improve the matching degree between the antenna and human tissues, so that microwave pulses can be transmitted into the human body; on the other hand, due to the relatively high dielectric constant of the ceramic dielectric plate, the wavelength of electromagnetic waves can be shortened. And the size of the antenna is usually proportional to the wavelength. Therefore, using the ceramic dielectric plate can reduce the physical size of the transmitting antenna and the receiving antenna while maintaining the same operating frequency. In addition, the ceramic dielectric plate also has the characteristic of low loss, which helps to reduce the energy loss during the propagation of electromagnetic waves, improve the radiation efficiency of the transmitting antenna and the receiving antenna, and has good performance in the entire ultra-wideband frequency band and is more suitable for human tissues, so that the antenna can be closely attached to the surface of the human skin when in use.

[0017] Of course, it is not necessary for any product or method implementing the present application to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other embodiments can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the ultra-wideband antenna structure provided by the embodiment of the present application;

[0020] Figure 2 For Figure 1 exploded view of the ultra-wideband antenna in one perspective;

[0021] Figure 3 For Figure 1 exploded view of the ultra-wideband antenna in another perspective;

[0022] Figure 4 Schematic diagrams of the transmitting antenna and the receiving antenna;

[0023] Figure 5 Side view of the ultra-wideband antenna structure provided by the embodiment of the present application;

[0024] Figure 6 S11 parameter diagram of the ultra-wideband antenna;

[0025] Figure 7 Input and received signal waveforms when the antenna is working.

[0026] Reference numerals are as follows: transmitting antenna 1; first transmitting arm 11; first wiring node 111; second transmitting arm 12; second wiring node 121; receiving antenna 2; first receiving arm 21; third wiring node 211; second receiving arm 22; fourth wiring node 221; dielectric substrate 3; first through hole 31; second through hole 32; third through hole 33; fourth through hole 34; first connection line 35; second connection line 36; ceramic dielectric plate 4; circuit board 5; third connection line 51; first horizontal section 511; first vertical section 512; fourth connection line 52; second horizontal section 521; second vertical section 522; opening 53; opening size W; first interval A1; second interval A2; first distance B1; second distance B2; pitch C; width L1; length L2; side length L3; diameter D; thickness H1 of the ceramic dielectric plate; thickness H2 of the dielectric substrate; total thickness H3; height H4 of the ultra-wideband antenna; first direction X; second direction Y; thickness direction H. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0028] To solve the problems that the detection equipment is bulky, resulting in limited detection locations and great difficulty in positioning during surgery, the present application proposes an ultra-wideband antenna for breast tumor and regional lymph node localization. The ultra-wideband antenna can be used for breast tumor localization or for regional lymph node localization. Among them, regional lymph nodes are superficial lymph nodes such as sentinel lymph nodes and axillary lymph nodes.

[0029] Such as Figure 1 , Figure 2 and Figure 3As shown in the figure, the ultra-wideband antenna includes a dielectric substrate 3, a transmitting antenna 1, a receiving antenna 2, a ceramic dielectric plate 4, a feeding unit, and a circuit board 5. The dielectric substrate 3 includes a first through hole 31 and a second through hole 32 oppositely arranged along a first direction X, and a third through hole 33 and a fourth through hole 34 oppositely arranged along a second direction Y, and the first direction X and the second direction Y are cross-arranged. The transmitting antenna 1 and the receiving antenna 2 are attached to the first side of the dielectric substrate 3. The transmitting antenna 1 includes a first transmitting arm 11 and a second transmitting arm 12 symmetrically arranged at intervals along the first direction X. The receiving antenna 2 includes a first receiving arm 21 and a second receiving arm 22 symmetrically arranged at intervals along the second direction Y. The ceramic dielectric plate 4 is attached to the side of the transmitting antenna 1 and the receiving antenna 2 away from the dielectric substrate 3, and there is no air gap in the middle. For example, the ceramic dielectric plate 4 can be bonded to the side of the transmitting antenna 1 and the receiving antenna 2 away from the dielectric substrate 3, and the ceramic dielectric plate 4 covers the transmitting antenna 1 and the receiving antenna 2. The feeding unit is located on the second side of the dielectric substrate 3 and is electrically connected to the first transmitting arm 11 and the second transmitting arm 12 through the first through hole 31 and the second through hole 32 respectively. The circuit board 5 is arranged on the second side of the dielectric substrate 3 and is electrically connected to the first receiving arm 21 and the second receiving arm 22 through the third through hole 33 and the fourth through hole 34 respectively.

[0030] In this embodiment, the ultra-wideband antenna includes both a transmitting antenna 1 and a receiving antenna 2. The transmitting antenna 1 and the receiving antenna 2 are cross-arranged. The two transmitting arms between the transmitting antennas 1 are diagonally distributed, and the two receiving arms of the receiving antenna 2 are diagonally distributed. By increasing the distance between each other, the transceiver isolation degree of the transmitting antenna 1 and the receiving antenna 2 can be maintained, so that signals can be transmitted and received simultaneously. The transmitting antenna 1 includes two transmitting arms, and the receiving antenna 2 also includes two receiving arms. Therefore, the transmitting antenna 1 and the receiving antenna 2 can transmit differential signals, and the amplitudes of these two signals are the same and the phases are opposite. The differential signal transmits the original signal and its reverse signal simultaneously, and the receiving end restores the original signal by comparing the differences between these two signals. This method can effectively eliminate common-mode noise, thereby improving the quality and stability of the signal. That is to say, the differential signal has strong anti-interference ability. Moreover, the differential signal transmission method greatly reduces electromagnetic radiation and energy loss, so it can save system power consumption and is more suitable for long-distance transmission.

[0031] By loading the ceramic dielectric plate 4, on the one hand, the ceramic dielectric plate 4 is used to improve the matching degree between the antenna and human tissues, so that microwave pulses can be transmitted into the human body; on the other hand, due to the relatively high dielectric constant of the ceramic dielectric plate 4, the wavelength of electromagnetic waves can be shortened. And the size of the antenna is usually proportional to the wavelength. Therefore, using the ceramic dielectric plate 4 can reduce the physical sizes of the transmitting antenna 1 and the receiving antenna 2 while maintaining the same operating frequency. In addition, the ceramic dielectric plate 4 also has the characteristic of low loss, which helps to reduce the energy loss during the propagation of electromagnetic waves, improve the radiation efficiency of the transmitting antenna 1 and the receiving antenna 2, and has good performance in the entire ultra-wideband frequency band, and is more suitable for human tissues, so that the antenna can be closely attached to the human skin surface when in use.

[0032] Specifically, the ceramic dielectric plate 4 can be alumina ceramic or zirconia ceramic, and the dielectric constant ε is between 10 and 30 . The dielectric substrate 3 can be an epoxy glass cloth laminate (FR-4).

[0033] In some embodiments of the present application, as Figure 4 shown, the first direction X is perpendicular to the second direction Y. That is, the transmitting arms of the transmitting antenna 1 and the receiving arms of the receiving antenna 2 are perpendicular to each other in pairs, which can improve the transceiver isolation between the transmitting antenna 1 and the receiving antenna 2 to 80 dB, so that signals can be transmitted and received simultaneously.

[0034] In some embodiments of the present application, in combination with Figure 1 , Figure 2 , Figure 3 shown, the circuit board 5 is perpendicularly arranged to the dielectric substrate 3 and is parallel to the second direction Y.

[0035] In this embodiment, by perpendicularly designing the dielectric substrate 3 and the circuit board 5, and the circuit board 5 is parallel to the second direction Y, that is, the circuit board 5 is parallel to the receiving antenna 2 and perpendicular to the transmitting antenna 1, this can reduce the mutual interference between the transmitted signal and the received signal and further improve the transceiver isolation.

[0036] In some embodiments of the present application, in combination with Figure 1 , Figure 2 , Figure 3 shown, the center of the interval between the first transmitting arm 11 and the second transmitting arm 12 is the center of the dielectric substrate 3, and the center of the interval between the first receiving arm 21 and the second receiving arm 22 is the center of the dielectric substrate 3. Symmetrically arranging the transmitting antenna 1 and the receiving antenna 2 with the center of the dielectric substrate 3 as the interval center can be evenly distributed on the dielectric substrate 3, rationally utilize the layout space of the dielectric substrate 3, and is beneficial to reducing the size of the ultra-wideband antenna.

[0037] Optionally, as Figure 4As shown, the first interval A1 between the first transmitting arm 11 and the second transmitting arm 12 is 1 mm - 1.5 mm. For example, it can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.; the second interval A2 between the first receiving arm 21 and the second receiving arm 22 is 1 mm - 1.5 mm. For example, it can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0038] The first interval A1 between the first transmitting arm 11 and the second transmitting arm 12 is greater than or equal to 1 mm and less than or equal to 1.5 mm, enabling the first transmitting arm 11 and the second transmitting arm 12 to maintain independent transmitted signals, and facilitating reducing the occupied space of the transmitting antenna 1 and the volume of the ultra-wideband antenna.

[0039] The second interval A2 between the first receiving arm 21 and the second receiving arm 22 is greater than or equal to 1 mm and less than or equal to 1.5 mm, enabling the first receiving arm 21 and the second receiving arm 22 to maintain independent transmitted signals, and facilitating reducing the occupied space of the receiving antenna 2 and the volume of the ultra-wideband antenna.

[0040] The first transmitting arm 11 and the second transmitting arm 12 are diagonally distributed, and the first receiving arm 21 and the second receiving arm 22 are diagonally distributed, and they are perpendicular to each other pairwise. Therefore, the dielectric substrate 3 can be set as a circular substrate. The diameter D of the circular substrate is the maximum size of the ultra-wideband antenna when not considering the dimension in the thickness direction H, which can further reduce the volume of the ultra-wideband antenna.

[0041] Of course, the shape of the dielectric substrate 3 is not limited to circular, and it can also be other shapes such as rectangular, square, polygonal, etc. It should be noted that the dielectric substrate 3 has a certain thickness, and here circular, rectangular, etc. refer to the shape of the cross-section perpendicular to the thickness direction H.

[0042] As Figure 4 shown, the cross-section of the first transmitting arm 11 and the second transmitting arm 12 along their thickness direction H is an isosceles triangle or an isosceles trapezoid, and the cross-section of the first receiving arm 21 and the second receiving arm 22 along the thickness direction H is an isosceles triangle or an isosceles trapezoid. The apex angle of the isosceles triangle or the upper base of the isosceles trapezoid is the end close to the center of the dielectric substrate 3.

[0043] Designing the transmitting arm or the receiving arm as an isosceles triangle or an isosceles trapezoid structure is beneficial for multi-band design. By adjusting the ratio of the base (including the lower base) to the height, the resonant frequencies of different bands can be corresponded.

[0044] Preferably, the cross-sections of the first transmitting arm 11 and the second transmitting arm 12 along their thickness direction H are isosceles triangles, and the cross-sections of the first receiving arm 21 and the second receiving arm 22 along the thickness direction H are isosceles triangles. This is because the isosceles triangle antenna has stronger directivity, can reduce the radiation of signals to non-target directions, thereby reducing the interference caused by the multipath effect, and the structure of the isosceles triangle is relatively compact, which is beneficial to reducing the volume of the ultra-wideband antenna.

[0045] Furthermore, the apex angle of the isosceles triangle is 20° - 40°, for example, it can be 20°, 25°, 30°, 35°, 40°. The apex angle can affect the current distribution and radiation directivity. A larger apex angle, such as 40°, can change the radiation resistance of the antenna and can further improve the operating bandwidth of the antenna.

[0046] Optionally, as Figure 4 shown, the width L1 of the first transmitting arm 11, the second transmitting arm 12, the first receiving arm 21 and the second receiving arm 22 is 4 mm - 5 mm, for example, it can be 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, etc., and the length L2 of the first transmitting arm 11, the second transmitting arm 12, the first receiving arm 21 and the second receiving arm 22 is 7 mm - 9 mm, for example, it can be 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, etc.

[0047] The width L1 of the first transmitting arm 11, the second transmitting arm 12, the first receiving arm 21 and the second receiving arm 22 is also the width L1 of the base of the isosceles triangle or the lower base of the isosceles trapezoid, and the length L2 of the first transmitting arm 11, the second transmitting arm 12, the first receiving arm 21 and the second receiving arm 22 is also the height of the isosceles triangle or the isosceles trapezoid.

[0048] Optionally, as Figure 5 shown, the volume of the ultra-wideband antenna is (19 mm - 22 mm) × (19 mm - 22 mm) × (12 mm - 15 mm). That is, the length and width of the ultra-wideband antenna are 19 mm - 22 mm respectively, for example, it can be 19 mm, 20 mm, 21 mm, 22 mm, etc., and the length and width of the ultra-wideband antenna are also the diameter D of the dielectric substrate 3. The height H4 of the ultra-wideband antenna is the dimension along the thickness direction H, and the height H4 of the ultra-wideband antenna can be 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, etc.

[0049] It can be understood that the circuit board 5 is generally a thin plate or sheet-like structure. The cross-section perpendicular to the thickness direction H can be rectangular or square. The side length L3 of the circuit board 5 along the second direction Y is greater than or equal to 9 mm and less than or equal to the diameter D of the dielectric substrate 3. For example, it can be 10 mm, 11 mm, etc.

[0050] Optionally, as Figure 5 shown, the thickness H1 of the ceramic dielectric plate is 2 mm - 4 mm. For example, it can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc. The thickness H2 of the dielectric substrate is 0.3 mm - 1 mm. For example, it can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0051] The thickness H1 of the ceramic dielectric plate is greater than or equal to 2 mm and less than or equal to 4 mm, which has a small attenuation effect on the electromagnetic wave signal and can improve the purity of the electromagnetic wave signal. The thickness H2 of the dielectric substrate being greater than or equal to 0.3 mm and less than or equal to 1 mm can improve the support strength of the dielectric substrate 3 and will not have too much impact on the volume of the ultra-wideband antenna.

[0052] The total thickness H3 of the ceramic dielectric plate 4, the transmitting antenna 1, the receiving antenna 2, and the dielectric substrate 3 is 2.3 mm - 4.5 mm. For example, it can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.2 mm, etc.

[0053] As a specific embodiment, the volume of the ultra-wideband antenna is 20 mm × 13.57 mm × 20 mm. As Figure 4 、 Figure 5 shown, where L1 = 4.29 mm, L2 = 8 mm, H1 = 3 mm, H2 = 0.5 mm, H3 = 3.54 mm, L3 = 10 mm, H4 = 13.57 mm, D = 20 mm, and W = 1 mm, where W is the opening size W of the circuit board 5 and is equal to the first interval A1 and the second interval A2.

[0054] Regarding the actual working performance of the ultra-wideband antenna, reference can be made to Figure 6 and Figure 7 . Figure 6 is the S11 parameter diagram of the ultra-wideband antenna. The abscissa is the frequency, with the unit GHz, and the ordinate is the return loss, with the unit dB (decibel). S11 is the input reflection coefficient, also known as the input return loss. In the range of 1.1 GHz - 7.4 GHz, the overall return loss of the ultra-wideband antenna is below -10 dB, having a good matching effect, a high energy transmission efficiency, and meeting the working requirements.

[0055] Figure 7 is the input and received signal waveforms when the antenna is working. The input signal (Figure 7 After being reflected by the internal implant reflector in the human body, the received waveform ( Figure 7 below) The pulse width and shape are basically unchanged, and the amplitude is attenuated. This part of the attenuation can be restored by signal amplification processing or extracted by algorithm processing, meeting the actual detection needs.

[0056] Furthermore, as Figure 4 shown, the first transmitting arm 11 and the second transmitting arm 12 have the same shape and size as the first receiving arm 21 and the second receiving arm 22. This can not only reduce the volume of the ultra-wideband antenna, but also simplify the manufacturing of the transmitting arm and the receiving arm, enabling them to share a set of processes.

[0057] In some embodiments of the present application, referring to Figure 2 、 Figure 3 , on the side of the first transmitting arm 11 and the second transmitting arm 12 close to the dielectric substrate 3, there are respectively a first wiring node 111 opposite to the first through hole 31 and a second wiring node 121 opposite to the second through hole 32. The first wiring node 111 and the second wiring node 121 are provided at one end of the first transmitting arm 11 and the second transmitting arm 12 close to the center of the dielectric substrate 3. On the second side of the dielectric substrate 3, there are a first connection line 35 and a second connection line 36 electrically connected to the feeding unit. The first connection line 35 and the second connection line 36 are respectively electrically connected to the first wiring node 111 and the second wiring node 121 through the first through hole 31 and the second through hole 32.

[0058] On the side of the first receiving arm 21 and the second receiving arm 22 close to the dielectric substrate 3, there are respectively a third wiring node 211 opposite to the third through hole 33 and a fourth wiring node 221 opposite to the fourth through hole 34. The third wiring node 211 and the fourth wiring node 221 are provided at one end of the first receiving arm 21 and the second receiving arm 22 close to the center of the dielectric substrate 3. The third wiring node 211 and the fourth wiring node 221 are respectively electrically connected to the circuit board 5 through the third through hole 33 and the fourth through hole 34.

[0059] In this embodiment, the wiring nodes corresponding to the first transmitting arm 11 and the second transmitting arm 12 are both located at one end close to the center of the dielectric substrate 3, that is, the feeding point is located at the end with a smaller area of the transmitting arm. When the transmitting arm is an isosceles triangle, the feeding point is located at the apex end, which can excite the current distribution along the base, making the radiation energy concentrated in the apex direction and the input impedance lower.

[0060] By providing the first connection node 111 and the second connection node 121, it is convenient for the first transmitting arm 11 to be electrically connected to the first connection circuit and the second transmitting arm 12 to be electrically connected to the second connection circuit. Herein, the first connection circuit and the second connection circuit can be pads, facilitating the electrical connection between the connection nodes and the feeding unit by soldering. By providing the third connection node 211 and the fourth connection node 221, it is convenient for the third receiving arm and the fourth receiving arm to be electrically connected to the circuit board 5.

[0061] The connection nodes corresponding to the first transmitting arm 11, the second transmitting arm 12, the first receiving arm 21, and the second receiving arm 22 are all located at one end thereof close to the center of the dielectric substrate 3. The feeding point is closer to the first transmitting arm 11 and the second transmitting arm 12, and the center of the interval between the first receiving arm 21 and the second receiving arm 22, which can further reduce the signal interference between them.

[0062] Optionally, referring to Figure 2 , Figure 3 , the first through hole 31, the second through hole 32, the third through hole 33, and the fourth through hole 34 are circumferentially and uniformly distributed around the center of the dielectric substrate 3. The first distance B1 between the first through hole 31 and the second through hole 32 is 1 mm - 2 mm, for example, it can be 1 mm, 1.5 mm, 2 mm, etc. The second distance B2 between the third through hole 33 and the fourth through hole 34 is 1 mm - 2 mm, for example, it can be 1 mm, 1.5 mm, 2 mm, etc.

[0063] The first distance B1 between the first through hole 31 and the second through hole 32 is greater than or equal to 1 mm and less than or equal to 2 mm, so that there is enough operating space when the first connection circuit, the second connection circuit are electrically connected to the feeding unit. The second distance B2 between the third through hole 33 and the fourth through hole 34 is greater than or equal to 1 mm and less than or equal to 2 mm, so that there is enough operating space when the third connection node 211 and the fourth connection node 221 are electrically connected to the circuit board 5.

[0064] In some embodiments of the present application, as shown in Figure 3 , the first connection line 35 covers at least part of the first through hole 31 and extends in a direction towards the center of the dielectric substrate 3. The second connection line 36 covers at least part of the second through hole 32 and extends in a direction towards the center of the dielectric substrate 3.

[0065] The first connection line 35 covers at least part of the first through hole 31, facilitating the electrical connection between the first connection node 111 and the first connection line 35. The first connection line 35 extends in a direction towards the center of the dielectric substrate 3, such that the first connection line 35 is away from the first transmitting arm 11 and located in the interval area between the first transmitting arm 11 and the second transmitting arm 12, which can reduce the signal interference at the signal intersection of the transmitting antenna 1 and the receiving antenna 2 and further improve the transceiver isolation.

[0066] The second connection line 36 covers at least part of the second through hole 32, facilitating the electrical connection between the second wiring node 121 and the second connection line 36. The second connection line 36 extends in a direction closer to the center of the dielectric substrate 3, such that the second connection line 36 is away from the second transmitting arm 12 and located in the interval area between the first transmitting arm 11 and the second transmitting arm 12, which can reduce the signal interference at the signal intersection of the transmitting antenna 1 and the receiving antenna 2, and further improve the transceiver isolation.

[0067] In some embodiments of the present application, referring to Figure 2 、 Figure 3 , the circuit board 5 includes a third connection line 51 and a fourth connection line 52, and the third connection line 51 and the fourth connection line 52 are electrically connected to the first receiving arm 21 and the second receiving arm 22 respectively; the third connection line 51 and the fourth connection line 52 are in an "L" shape. The third connection line 51 includes a first horizontal section 511 and a first vertical section 512. The first horizontal section 511 is perpendicular to the dielectric substrate 3 and opposite to the third through hole 33, and the first vertical section 512 extends in a direction closer to the extension line of the center of the dielectric substrate 3. The fourth connection line 52 includes a second horizontal section 521 and a second vertical section 522. The second horizontal section 521 is perpendicular to the dielectric substrate 3 and opposite to the fourth through hole 34, and the second vertical section 522 extends in a direction closer to the extension line of the center of the dielectric substrate 3.

[0068] In this embodiment, the third connection line 51 and the fourth connection line 52 are in an "L" shape, such that the third connection line 51 is away from the first receiving arm 21, the fourth connection line 52 is away from the second receiving arm 22, and the connection point is located in the interval area between the first receiving arm 21 and the second receiving arm 22, which can reduce the signal interference at the signal intersection of the transmitting antenna 1 and the receiving antenna 2, and further improve the transceiver isolation.

[0069] Among them, referring to Figure 5 , the distance C between the first vertical section 512 and the second vertical section 522 is greater than or equal to the second interval A2 and less than or equal to the second distance B2.

[0070] As Figure 3 shown, the orthographic projections of the first connection line 35 and the second connection line 36 on the dielectric substrate 3 are within the orthographic projection range of the transmitting antenna 1 on the dielectric substrate 3, and the orthographic projections of the third connection line 51 and the fourth connection line 52 on the dielectric substrate 3 are within the orthographic projection range of the receiving antenna 2 on the dielectric substrate 3. This can further reduce the signal interference between the transmitting antenna 1 and the receiving antenna 2, thereby improving the transceiver isolation.

[0071] As Figure 3As shown, the ceramic dielectric plate 4 is in a cross shape, and the covering area of the ceramic dielectric plate 4 is greater than or equal to the area of the surfaces of the transmitting antenna 1 and the receiving antenna 2 on the side away from the dielectric substrate 3. The ceramic dielectric plate 4 being in a cross shape can be as similar in shape as possible to the transmitting antenna 1 and the receiving antenna 2, which is beneficial to reducing the volume of the ceramic dielectric plate 4, saving materials, and thus reducing costs.

[0072] The covering area of the ceramic dielectric plate 4 is greater than or equal to the area of the surfaces of the transmitting antenna 1 and the receiving antenna 2 on the side away from the dielectric substrate 3, and can fully cover the surfaces of the transmitting antenna 1 and the receiving antenna 2 on the side away from the dielectric substrate 3.

[0073] It can be understood that the shape of the ceramic dielectric plate 4 is not limited to a cross-shaped plate, and can also be a circular plate, a square plate, etc.

[0074] In some embodiments of the present application, the feeding unit includes a coaxial cable, and the inner conductor and the outer conductor of the coaxial cable are respectively electrically connected to one of the first transmitting arm 11 and the second transmitting arm 12.

[0075] There is a certain electromagnetic shielding between the inner conductor and the outer conductor of the coaxial cable, which can effectively reduce signal interference, so the transmission speed is relatively fast. The electromagnetic shielding of the coaxial cable can reduce the interference of the external electromagnetic field and make the signal transmission more stable. There is an insulating layer between the inner conductor and the outer conductor of the coaxial cable, which can well isolate the internal signal and the external electromagnetic field and ensure the transmission quality of the signal. The coaxial cable has less loss and strong anti-interference ability during transmission, so it performs excellently in the transmission of TV signals.

[0076] In some embodiments of the present application, as Figure 3 shown, the circuit board 5 has an opening 53 on the side close to the dielectric substrate 3, and the opening 53 is used for the coaxial cable to pass through.

[0077] By providing the opening 53 on the side of the circuit board 5 close to the dielectric substrate 3, the inner conductor and the outer conductor of the coaxial cable can be respectively located on both sides of the thickness direction H of the circuit board 5, so as to facilitate the electrical connection with the first connection line 35 and the second connection line 36.

[0078] Among them, the first connection line 35 and the second connection line 36 are located on both sides of the opening 53 along the thickness direction H of the circuit board 5, and the third connection line 51 and the fourth connection line 52 are located on both sides of the opening 53 along the second direction Y.

[0079] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0080] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and the differences between each embodiment and other embodiments are emphasized.

[0081] The above description is only the preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are all included in the protection scope of the present application.

Claims

1. An ultra-wideband antenna for breast tumor and regional lymph node localization, characterized in that, Comprising: A dielectric substrate including a first through-hole and a second through-hole oppositely arranged along a first direction, and a third through-hole and a fourth through-hole oppositely arranged along a second direction, wherein the first direction and the second direction intersect; A transmitting antenna and a receiving antenna, which are attached to the first side of the dielectric substrate. The transmitting antenna includes a first transmitting arm and a second transmitting arm symmetrically arranged at intervals along the first direction, and the receiving antenna includes a first receiving arm and a second receiving arm symmetrically arranged at intervals along the second direction; A ceramic dielectric plate, which is attached to the side of the transmitting antenna and the receiving antenna away from the dielectric substrate, and the ceramic dielectric plate covers the transmitting antenna and the receiving antenna; A feeding unit, located on the second side of the dielectric substrate, and electrically connected to the first transmitting arm and the second transmitting arm through the first through-hole and the second through-hole respectively; A circuit board, arranged on the second side of the dielectric substrate, and electrically connected to the first receiving arm and the second receiving arm through the third through-hole and the fourth through-hole respectively.

2. The ultra-wideband antenna according to claim 1, wherein The first direction is perpendicular to the second direction; The circuit board is vertically arranged with respect to the dielectric substrate and parallel to the second direction.

3. The ultra-wideband antenna according to claim 1, characterized in that, The center of the interval between the first transmitting arm and the second transmitting arm is the center of the dielectric substrate, and the center of the interval between the first receiving arm and the second receiving arm is the center of the dielectric substrate.

4. The ultra-wideband antenna according to claim 3, characterized in that, The first interval between the first transmitting arm and the second transmitting arm is 1 mm - 1.5 mm; the second interval between the first receiving arm and the second receiving arm is 1 mm - 1.5 mm.

5. The ultra-wideband antenna according to claim 1, characterized in that, The cross-section of the first transmitting arm and the second transmitting arm along their thickness direction is an isosceles triangle or an isosceles trapezoid, and the cross-section of the first receiving arm and the second receiving arm along the thickness direction is an isosceles triangle or an isosceles trapezoid. The apex angle of the isosceles triangle or the upper base of the isosceles trapezoid is the end close to the center of the dielectric substrate.

6. The ultra-wideband antenna according to claim 5, wherein The widths of the first transmitting arm, the second transmitting arm, the first receiving arm and the second receiving arm are 4 mm - 5 mm, and the lengths of the first transmitting arm, the second transmitting arm, the first receiving arm and the second receiving arm are 7 mm - 9 mm.

7. The ultra-wideband antenna according to any one of claims 1-6, characterized in that, On the side of the first transmitting arm and the second transmitting arm close to the dielectric substrate, there are respectively a first wiring node oppositely arranged with respect to the first through-hole and a second wiring node oppositely arranged with respect to the second through-hole, and the first wiring node and the second wiring node are arranged at the ends of the first transmitting arm and the second transmitting arm close to the center of the dielectric substrate. On the second side of the dielectric substrate, there are a first connection line and a second connection line electrically connected to the feeding unit. The first connection line and the second connection line are electrically connected to the first wiring node and the second wiring node through the first through-hole and the second through-hole respectively; On one side of the first receiving arm and the second receiving arm close to the dielectric substrate, a third wiring node opposite to the third through hole and a fourth wiring node opposite to the fourth through hole are respectively provided. The third wiring node and the fourth wiring node are arranged at one end of the first receiving arm and the second receiving arm close to the center of the dielectric substrate. The third wiring node and the fourth wiring node are electrically connected to the circuit board through the third through hole and the fourth through hole respectively.

8. The ultra-wideband antenna according to claim 7, wherein The first through hole, the second through hole, the third through hole and the fourth through hole are circumferentially and uniformly distributed around the center of the dielectric substrate. The first distance between the first through hole and the second through hole is 1 mm - 2 mm, and the second distance between the third through hole and the fourth through hole is 1 mm - 2 mm.

9. The ultra-wideband antenna according to claim 7, wherein, The circuit board includes a third connection line and a fourth connection line. The third connection line and the fourth connection line are electrically connected to the first receiving arm and the second receiving arm respectively; The third connection line and the fourth connection line are in an "L" shape. The third connection line includes a first horizontal section and a first vertical section. The first horizontal section is perpendicular to the dielectric substrate and opposite to the third through hole. The first vertical section extends in the direction of the extension line of the center of the dielectric substrate. The fourth connection line includes a second horizontal section and a second vertical section. The second horizontal section is perpendicular to the dielectric substrate and opposite to the fourth through hole. The second vertical section extends in the direction of the extension line of the center of the dielectric substrate; The orthographic projections of the first connection line and the second connection line on the dielectric substrate are within the orthographic projection range of the transmitting antenna on the dielectric substrate. The orthographic projections of the third connection line and the fourth connection line on the dielectric substrate are within the orthographic projection range of the receiving antenna on the dielectric substrate.

10. The ultra-wideband antenna according to any one of claims 1-6, characterized in that, The ceramic dielectric plate is in a cross shape, and the coverage area of the ceramic dielectric plate is greater than or equal to the area of the surfaces of the transmitting antenna and the receiving antenna on the side away from the dielectric substrate; The feeding unit includes a coaxial cable. The inner conductor and the outer conductor of the coaxial cable are electrically connected to one of the first transmitting arm and the second transmitting arm respectively; One side of the circuit board close to the dielectric substrate has an opening for the coaxial cable to pass through.

11. The ultra-wideband antenna according to any one of claims 1-6, characterized in that, The volume of the ultra-wideband antenna is (19 mm - 22 mm) × (19 mm - 22 mm) × (12 mm - 15 mm); The thickness of the ceramic dielectric plate is 2 mm - 4 mm, and the thickness of the dielectric substrate is 0.3 mm - 1 mm.

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