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

Abstract

The present application provides an ultra-wideband antenna for breast tumor and regional lymph node localization, comprising a dielectric substrate, a transmitting antenna, a receiving antenna, a ceramic dielectric board, a feed unit, and a circuit board. The dielectric substrate includes first and second through-holes arranged opposite each other along a first direction, and third and fourth through-holes arranged opposite each other along a second direction. The transmitting antenna and the receiving antenna are attached to the first side of the dielectric substrate. The transmitting antenna includes a first transmitting arm and a second transmitting arm symmetrically spaced along the first direction, and the receiving antenna includes a first receiving arm and a second receiving arm symmetrically spaced along the second direction. The ceramic dielectric board covers the transmitting antenna and the receiving antenna from the side facing away from the dielectric substrate. The feed unit is located on the second side of the dielectric substrate and is electrically connected to the first transmitting arm and the second transmitting arm via the first and second through-holes, respectively. The circuit board is located on the second side of the dielectric substrate and is electrically connected to the first receiving arm and the second receiving arm via the third and fourth through-holes, respectively.

Description

Technical Field

[0001] The present application relates to the field of antenna design technology, and in particular to an ultra-wideband antenna for breast tumor and regional lymph node positioning. Background Art

[0002] Currently, common clinical breast cancer detection methods include X-ray imaging, ultrasound, and magnetic resonance imaging. Each of these methods has its own advantages and disadvantages, but the equipment used for these tests is expensive and bulky, significantly limiting the testing location and positioning during surgery. Therefore, researchers are looking to develop a new detection technology that would reduce the cost of the equipment without sacrificing accuracy, while also making the device smaller and more portable. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide an ultra-wideband antenna for breast tumor and regional lymph node localization, so as to achieve miniaturization of the ultra-wideband antenna, make it suitable for portable use, and facilitate placement on human skin. The specific technical solution is as follows:

[0004] The present application provides an ultra-wideband antenna for breast tumor and regional lymph node localization, comprising: a dielectric substrate comprising a first through hole and a second through hole arranged opposite to each other along a first direction, and a third through hole and a fourth through hole arranged opposite to each other along a second direction, the first and second directions being arranged intersectingly; a transmitting antenna and a receiving antenna, both disposed on a first side of the dielectric substrate, the transmitting antenna comprising a first transmitting arm and a second transmitting arm symmetrically spaced along the first direction, and the receiving antenna comprising a first receiving arm and a second receiving arm symmetrically spaced along the second direction; a ceramic dielectric plate, disposed on a side of the transmitting antenna and the receiving antenna away from the dielectric substrate, the ceramic dielectric plate covering the transmitting antenna and the receiving antenna; a feeding unit, located on a second side of the dielectric substrate and electrically connected to the first transmitting arm and the second transmitting arm via the first through hole and the second through hole, respectively; and a circuit board, disposed on the second side of the dielectric substrate and electrically connected to the first receiving arm and the second receiving arm via 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 arranged perpendicular 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, a first interval between the first transmitting arm and the second transmitting arm is 1 mm-1.5 mm; a second interval between the first receiving arm and the second receiving arm is 1 mm-1.5 mm.

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

[0009] In some embodiments, the width of the first transmitting arm, the second transmitting arm, the first receiving arm and the second receiving arm is 4 mm-5 mm, and the length of the first transmitting arm, the second transmitting arm, the first receiving arm and the second receiving arm is 7 mm-9 mm.

[0010] In some embodiments, a first wiring node disposed opposite to the first through hole and a second wiring node disposed opposite to the second through hole are respectively provided on a side of the first transmitting arm and the second transmitting arm close to the dielectric substrate, and the first wiring node and the second wiring node are provided at one end of the first transmitting arm and the second transmitting arm close to the center of the dielectric substrate; a first connecting line and a second connecting line electrically connected to the feeding unit are provided on the second side of the dielectric substrate, and the first connecting line and the second connecting 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; a third wiring node disposed opposite to the third through hole and a fourth wiring node disposed opposite to the fourth through hole are respectively provided on a side of the first receiving arm and the second receiving arm close to the dielectric substrate, and the third wiring node and the fourth wiring node are provided at one end of the first receiving arm and the second receiving arm close to the center of the dielectric substrate, and 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.

[0011] In some embodiments, the first through hole, the second through hole, the third through hole, and the fourth through hole are evenly distributed circumferentially with the center of the dielectric substrate as the center, a first distance between the first through hole and the second through hole is 1 mm-2 mm, and a 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 connecting circuit and a fourth connecting circuit, and the third connecting circuit and the fourth connecting circuit are electrically connected to the first receiving arm and the second receiving arm respectively; the third connecting circuit and the fourth connecting circuit are "L"-shaped, and the third connecting circuit 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, and the first vertical section extends in a direction close to the extension line of the center of the dielectric substrate; the fourth connecting circuit 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, and the second vertical section extends in a direction close to the extension line of the center of the dielectric substrate; the orthographic projections of the first connecting circuit and the second connecting circuit on the dielectric substrate are located within the orthographic projection range of the transmitting antenna on the dielectric substrate, and the orthographic projections of the third connecting circuit and the fourth connecting circuit on the dielectric substrate are located within the orthographic projection range of the receiving antenna on the dielectric substrate.

[0013] In some embodiments, the ceramic dielectric plate is cross-shaped, and the coverage area of ​​the ceramic dielectric plate is greater than or equal to the area of ​​the surface of the transmitting antenna and the receiving antenna on a side away from the dielectric substrate; the feeding unit includes a coaxial cable, and the inner conductor and outer conductor of the coaxial cable are respectively electrically connected to one of the first transmitting arm and the second transmitting arm; the circuit board has an opening on a side close to the dielectric substrate, and the opening is used to allow 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] Beneficial effects of the embodiments of the present application:

[0016] The ultra-wideband antenna for breast tumor and regional lymph node localization provided in the embodiment of the present application includes both a transmitting antenna and a receiving antenna. The transmitting antenna and the receiving antenna are arranged crosswise, and 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 transmission and reception isolation 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 two signals have the same amplitude and opposite phases. The differential signal is restored by sending the original signal and its reverse signal at the same time, and the receiving end recovers the original signal by comparing the difference between the two signals. This method can effectively eliminate common-mode noise, thereby improving the quality and stability of the signal, that is, the differential signal has a strong anti-interference ability. In addition, the differential signal transmission method greatly reduces electromagnetic radiation and energy loss, thereby saving system power consumption and being more suitable for long-distance transmission. By adding a ceramic dielectric plate, the antenna improves the compatibility between the antenna and human tissue, ensuring that microwave pulses are transmitted into the body. Furthermore, due to its high dielectric constant, the plate shortens the wavelength of electromagnetic waves. Since antenna size is generally proportional to wavelength, using a ceramic dielectric plate can reduce the physical size of both the transmitting and receiving antennas while maintaining the same operating frequency. Furthermore, the ceramic dielectric plate offers low loss, which helps minimize energy loss during electromagnetic wave propagation and improves the radiation efficiency of both transmitting and receiving antennas. It also performs well across the entire ultra-wideband frequency band and is particularly well-suited to human tissue, allowing the antenna to remain close to the skin during use.

[0017] Of course, it is not necessary to achieve all the advantages described above at the same time when implementing any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 A schematic diagram of the ultra-wideband antenna structure provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 An exploded view of the UWB antenna from one perspective;

[0021] Figure 3 for Figure 1 An exploded view of the UWB antenna from another perspective;

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

[0023] Figure 5 A side view of the ultra-wideband antenna structure provided in an embodiment of the present application;

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

[0025] Figure 7 These are the input and receiving signal waveforms of the antenna when it is working.

[0026] The accompanying drawings are numbered 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 connecting line 35; second connecting line 36; ceramic dielectric board 4; circuit board 5; third connecting line 51; first horizontal section 511; first vertical section 512; fourth connecting line 52; second horizontal section 521; second vertical section 522; opening 53; opening size W; first interval A2; second interval A1; first distance B1; second distance B2; spacing C; width L1; length L2; side length L3; diameter D; thickness H1 of the ceramic dielectric board; 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 DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0028] To address the issues of bulky detection equipment, which limits detection locations and makes positioning difficult during surgery, this application proposes an ultra-wideband antenna for breast tumor and regional lymph node localization. This ultra-wideband antenna can be used to locate breast tumors or regional lymph nodes, such as superficial lymph nodes such as sentinel lymph nodes and axillary lymph nodes.

[0029] like Figure 1 、 Figure 2 and Figure 3As shown, the ultra-wideband antenna includes a dielectric substrate 3, a transmitting antenna 1 and a receiving antenna 2, a ceramic dielectric board 4, a feed unit, and a circuit board 5. The dielectric substrate 3 includes a first through-hole 31 and a second through-hole 32 arranged oppositely along a first direction X, and a third through-hole 33 and a fourth through-hole 34 arranged oppositely along a second direction Y, with the first direction X and the second direction Y intersecting. The transmitting antenna 1 and the receiving antenna 2 are attached to a first side of the dielectric substrate 3. The transmitting antenna 1 includes a first transmitting arm 11 and a second transmitting arm 12 symmetrically spaced along the first direction X, and the receiving antenna 2 includes a first receiving arm 21 and a second receiving arm 22 symmetrically spaced along the second direction Y. The ceramic dielectric board 4 is attached to the side of the transmitting antenna 1 and the receiving antenna 2 away from the dielectric substrate 3, with no air gap between them. For example, the ceramic dielectric board 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 board 4 covers the transmitting antenna 1 and the receiving antenna 2. The feed 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 via a first through-hole 31 and a second through-hole 32, respectively. The circuit board 5 is also located 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 via a third through-hole 33 and a 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 two antennas are arranged in a cross-stack configuration, with the two transmitting arms of the transmitting antenna 1 and the two receiving arms of the receiving antenna 2 positioned diagonally opposite each other. By increasing the distance between them, the transmit and receive isolation between the transmitting antenna 1 and the receiving antenna 2 is maintained, enabling simultaneous transmission and reception of signals. 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, which have equal amplitudes and opposite phases. Differential signaling involves simultaneously transmitting an original signal and its inverse signal. The receiving end then compares the difference between the two signals to recover the original signal. This method effectively eliminates common-mode noise, thereby improving signal quality and stability. This means that differential signaling has strong anti-interference capabilities. Furthermore, differential signaling significantly reduces electromagnetic radiation and energy loss, thereby saving system power and making it more suitable for long-distance transmission.

[0031] The ceramic dielectric plate 4 is loaded onto the antenna. It not only improves the compatibility between the antenna and human tissue, ensuring that microwave pulses are transmitted into the body, but also shortens the wavelength of electromagnetic waves due to its high dielectric constant. Since antenna size is generally proportional to wavelength, using the ceramic dielectric plate 4 can reduce the physical size of both the transmitting antenna 1 and the receiving antenna 2 while maintaining the same operating frequency. Furthermore, the ceramic dielectric plate 4 exhibits low loss, helping to reduce energy loss during electromagnetic wave propagation and improving the radiation efficiency of the transmitting antenna 1 and the receiving antenna 2. It also offers excellent performance across the entire ultra-wideband frequency band and is particularly well-suited to human tissue, allowing the antenna to remain close to the skin during use.

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

[0033] In some embodiments of the present application, Figure 4 As 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, which can improve the transmit-receive isolation between the transmitting antenna 1 and the receiving antenna 2 to 80 dB, thereby enabling simultaneous transmission and reception of signals.

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

[0035] In this embodiment, the dielectric substrate 3 is designed to be perpendicular to 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 transmit-receive isolation.

[0036] In some embodiments of the present application, Figure 1 、 Figure 2 、 Figure 3 As shown, the center of the interval between first transmitting arm 11 and second transmitting arm 12 is the center of dielectric substrate 3, and the center of the interval between first receiving arm 21 and second receiving arm 22 is the center of dielectric substrate 3. Symmetrically arranging transmitting antenna 1 and receiving antenna 2 with the center of dielectric substrate 3 as the center of the interval allows for even distribution on dielectric substrate 3, effectively utilizing the layout space of dielectric substrate 3 and facilitating a reduction in the size of the ultra-wideband antenna.

[0037] Alternatively, as Figure 4As shown, the first interval A2 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 A1 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 A2 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, so that the first transmitting arm 11 and the second transmitting arm 12 can maintain independent transmission signals from each other, which is beneficial to reducing the occupied space of the transmitting antenna 1 and reducing the volume of the ultra-wideband antenna.

[0039] The second interval A1 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, so that the first receiving arm 21 and the second receiving arm 22 can maintain independent transmission signals from each other, which is beneficial to reducing the occupied space of the receiving antenna 2 and reducing the volume of the ultra-wideband antenna.

[0040] The first transmitting arm 11 and the second transmitting arm 12 are diagonally arranged, and the first receiving arm 21 and the second receiving arm 22 are diagonally arranged, and are perpendicular to each other. 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 the size in the thickness direction H is not considered, 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 may also be other shapes such as rectangular, square, polygonal, etc. It should be noted that the dielectric substrate 3 has a certain thickness, and the circular, rectangular, etc. here refer to the shape of the cross section perpendicular to the thickness direction H.

[0042] like Figure 4 As shown, the cross-sections of the first transmitting arm 11 and the second transmitting arm 12 along the thickness direction H thereof are isosceles triangles or isosceles trapezoids, and the cross-sections of the first receiving arm 21 and the second receiving arm 22 along the thickness direction H are isosceles triangles or isosceles trapezoids, wherein the vertex 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 receiving arm into an isosceles triangle or isosceles trapezoidal structure is conducive to multi-band design. By adjusting the ratio of the base (including the lower base) and the height, the resonant frequencies of different frequency bands can be matched.

[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 their thickness direction H are isosceles triangles. This is because isosceles triangle antennas have stronger directivity, reducing signal radiation in non-target directions, thereby reducing interference caused by multipath effects. In addition, the isosceles triangle structure is relatively compact, which helps reduce the size of the ultra-wideband antenna.

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

[0046] Alternatively, as Figure 4 As 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 to 5 mm, for example, 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 to 9 mm, for example, 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 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 the height of the isosceles triangle or the isosceles trapezoid.

[0048] Alternatively, as Figure 5 As shown, the volume of the UWB antenna is (19 mm - 22 mm) × (19 mm - 22 mm) × (12 mm - 15 mm). That is, the length and width of the UWB antenna are 19 mm - 22 mm, respectively, and can be, for example, 19 mm, 20 mm, 21 mm, 22 mm, etc. The length and width of the UWB antenna are the diameter D of the dielectric substrate 3. The height H4 of the UWB antenna is the dimension along the thickness direction H, and 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 structure, and 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] Alternatively, as Figure 5 As shown, the thickness H1 of the ceramic dielectric plate is 2 mm to 4 mm, for example, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc., and the thickness H2 of the dielectric substrate is 0.3 mm to 1 mm, for example, 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 minimizes the attenuation of electromagnetic wave signals and improves the purity of electromagnetic wave signals. The thickness H2 of the dielectric substrate is greater than or equal to 0.3 mm and less than or equal to 1 mm, which improves the supporting strength of the dielectric substrate 3 without significantly affecting 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 to 4.5 mm, for example, 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. Figure 4 、 Figure 5 As shown, L1=4.29mm, L2=8mm, H1=3mm, H2=0.5mm, H3=3.54mm, L3=10mm, H4=13.57mm, D=20mm and W=1mm, where W is the opening size W of the circuit board 5, which is equal to the first interval A2 and the second interval A1.

[0054] For the actual working performance of ultra-wideband antenna, please refer to Figure 6 and Figure 7 . Figure 6 This is a plot of the S11 parameter for the ultra-wideband antenna. The horizontal axis represents frequency in GHz, and the vertical axis represents return loss in dB (decibels). S11 is the input reflection coefficient, also known as input return loss. Within the 1.1 GHz to 7.4 GHz range, the overall return loss of the ultra-wideband antenna is below -10 dB, demonstrating excellent matching and high energy transmission efficiency, meeting operational requirements.

[0055] Figure 7 The input and receiving signal waveforms of the antenna when it is working. Input signal ( Figure 7 After being reflected by the reflector implanted in the human body, the received waveform ( Figure 7 (bottom) The pulse width and shape remain basically unchanged, but the amplitude is attenuated. This attenuation can be restored through signal amplification or extracted through algorithm processing, which meets the actual detection needs.

[0056] Furthermore, if Figure 4 As shown, the first transmitting arm 11 and the second transmitting arm 12, as well as the first receiving arm 21 and the second receiving arm 22, have the same shape and size. This not only reduces the size of the ultra-wideband antenna, but also simplifies the manufacturing of the transmitting arm and the receiving arm, allowing them to share a common process.

[0057] In some embodiments of the present application, reference is made to Figure 2 、 Figure 3 A first connection node 111 and a second connection node 121 are respectively provided on the side of the first radiating arm 11 and the second radiating arm 12 near the dielectric substrate 3, and are arranged opposite the first through-hole 31 and the second through-hole 32. The first connection node 111 and the second connection node 121 are located at one end of the first radiating arm 11 and the second radiating arm 12 near the center of the dielectric substrate 3. A first connection line 35 and a second connection line 36 are provided on the second side of the dielectric substrate 3, which are electrically connected to the feed unit. The first connection line 35 and the second connection line 36 are electrically connected to the first connection node 111 and the second connection node 121 through the first through-hole 31 and the second through-hole 32, respectively.

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

[0059] In this embodiment, the connection nodes corresponding to the first radiating arm 11 and the second radiating arm 12 are both located at the end thereof close to the center of the dielectric substrate 3. That is, the feeding point is located at the end of the radiating arm with a smaller area. When the radiating arm is an isosceles triangle, the feeding point is located at the vertex end, which can stimulate a current distribution along the bottom edge, so that the radiation energy is concentrated in the direction of the vertex, and the input impedance is low.

[0060] The provision of first and second wiring nodes 111, 121 facilitates electrical connection between the first transmitting arm 11 and the first wiring circuit, and between the second transmitting arm 12 and the second wiring circuit. The first and second wiring circuits may be solder pads, facilitating electrical connection between the wiring nodes and the feed unit via soldering. The provision of third and fourth wiring nodes 211, 221 facilitates electrical connection between the third and fourth receiving arms and 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 center of the interval between the first transmitting arm 11 and the second transmitting arm 12 and the first receiving arm 21 and the second receiving arm 22, which can further reduce signal interference between them.

[0062] Optionally, refer 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 evenly distributed circumferentially around the center of the dielectric substrate 3. A first distance B1 between the first through hole 31 and the second through hole 32 is 1 mm to 2 mm, for example, 1 mm, 1.5 mm, 2 mm, etc., and a second distance B2 between the third through hole 33 and the fourth through hole 34 is 1 mm to 2 mm, for example, 1 mm, 1.5 mm, 2 mm, etc.

[0063] A 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 sufficient operating space when the first wiring circuit, the second wiring circuit and the feeding unit are electrically connected. A 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 sufficient operating space when the third wiring node 211 and the fourth wiring node 221 are electrically connected to the circuit board 5.

[0064] In some embodiments of the present application, reference is made to Figure 3 As shown, the first connection line 35 covers at least a portion of the first through hole 31 and extends from the first through hole 31 toward the center of the dielectric substrate 3 . The second connection line 36 covers at least a portion of the second through hole 32 and extends from the second through hole 32 toward the center of the dielectric substrate 3 .

[0065] The first connecting line 35 covers at least a portion of the first through-hole 31, facilitating electrical connection between the first connection node 111 and the first connecting line 35. The first connecting line 35 extends toward the center of the dielectric substrate 3, away from the first radiating arm 11. This position allows the first connecting line 35 to be located in the gap between the first radiating arm 11 and the second radiating arm 12, thereby reducing signal interference between the transmitting antenna 1 and the receiving antenna 2 at the signal intersection and further improving transmit / receive isolation.

[0066] Second connecting line 36 covers at least a portion of second through hole 32, facilitating electrical connection between second connection node 121 and second connecting line 36. Second connecting line 36 extends toward the center of dielectric substrate 3, away from second radiating arm 12. Positioned in the space between first radiating arm 11 and second radiating arm 12, this reduces signal interference between transmitting antenna 1 and receiving antenna 2 at the signal intersection, further improving transmit / receive isolation.

[0067] In some embodiments of the present application, reference is made to Figure 2 、 Figure 3 The circuit board 5 includes a third connecting line 51 and a fourth connecting line 52. The third connecting line 51 and the fourth connecting line 52 are electrically connected to the first receiving arm 21 and the second receiving arm 22, respectively. The third connecting line 51 and the fourth connecting line 52 are L-shaped. The third connecting 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 the third through hole 33. The first vertical section 512 extends toward the center extension line of the dielectric substrate 3. The fourth connecting 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 the fourth through hole 34. The second vertical section 522 extends toward the center extension line of the dielectric substrate 3.

[0068] In this embodiment, the third connecting line 51 and the fourth connecting line 52 are "L"-shaped, so that the third connecting line 51 is away from the first receiving arm 21, the fourth connecting 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 signal interference to the transmitting antenna 1 and the receiving antenna 2 at the signal intersection, and further improve the transmission and reception isolation.

[0069] Among them, reference Figure 5 The spacing C between the first vertical segment 512 and the second vertical segment 522 is greater than or equal to the second interval A1 and less than or equal to the second distance B2.

[0070] like Figure 3 As shown, the orthographic projections of the first connecting line 35 and the second connecting 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 connecting line 51 and the fourth connecting 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 signal interference between the transmitting antenna 1 and the receiving antenna 2, thereby improving the transmission and reception isolation.

[0071] like Figure 3As shown, ceramic dielectric plate 4 is cross-shaped, and its coverage area is equal to or greater than the surface area of ​​transmitting antenna 1 and receiving antenna 2 on the side away from dielectric substrate 3. The cross-shape of ceramic dielectric plate 4 allows it to closely conform to transmitting antenna 1 and receiving antenna 2, thus reducing the size of ceramic dielectric plate 4, saving material, and thus reducing costs.

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

[0073] It is understandable that the shape of the ceramic dielectric plate 4 is not limited to a cross-shaped plate, and may 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 an inner conductor and an outer conductor of the coaxial cable are electrically connected to one of the first radiating arm 11 and the second radiating arm 12 respectively.

[0075] Coaxial cable has a certain degree of electromagnetic shielding between the inner and outer conductors, which can effectively reduce signal interference, resulting in relatively fast transmission speeds. The electromagnetic shielding of coaxial cable can reduce interference from external electromagnetic fields, making signal transmission more stable. A layer of insulation between the inner and outer conductors of coaxial cable effectively isolates the internal signal from external electromagnetic fields, ensuring signal transmission quality. Coaxial cable has low transmission loss and strong anti-interference performance, making it an excellent choice for television signal transmission.

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

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

[0078] 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 document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are 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 explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0080] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0081] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. An ultra-wideband antenna for breast tumor and regional lymph node localization, characterized in that: include: The dielectric substrate comprises a first through hole and a second through hole arranged opposite to each other along a first direction, and a third through hole and a fourth through hole arranged opposite to each other along a second direction, wherein the first direction and the second direction are arranged to intersect each other; A transmitting antenna and a receiving antenna are arranged on the first side of the dielectric substrate, the transmitting antenna includes a first transmitting arm and a second transmitting arm symmetrically arranged along the first direction, and the receiving antenna includes a first receiving arm and a second receiving arm symmetrically arranged along the second direction; a ceramic dielectric plate, disposed on a side of the transmitting antenna and the receiving antenna away from the dielectric substrate, the ceramic dielectric plate covering 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 radiating arm and the second radiating arm through the first through hole and the second through hole respectively; The circuit board is disposed on the second side of the dielectric substrate and is 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 arranged perpendicular to the dielectric substrate and parallel to the second direction.

3. The ultra-wideband antenna according to claim 1, wherein: 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, wherein: A first interval between the first transmitting arm and the second transmitting arm is 1 mm-1.5 mm; a 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, wherein: The cross-sections of the first transmitting arm and the second transmitting arm along their thickness directions are isosceles triangles or isosceles trapezoids. The cross-sections of the first receiving arm and the second receiving arm along their thickness directions are isosceles triangles or isosceles trapezoids. The vertex 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, characterized in that: The widths of the first transmitting arm, the second transmitting arm, the first receiving arm, and the second receiving arm are 4 mm to 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 to 9 mm.

7. The ultra-wideband antenna according to any one of claims 1 to 6, characterized in that: A first connection node disposed opposite the first through-hole and a second connection node disposed opposite the second through-hole are respectively provided on a side of the first radiating arm and the second radiating arm close to the dielectric substrate, and the first connection node and the second connection node are disposed at one end of the first radiating arm and the second radiating arm close to the center of the dielectric substrate. A first connection line and a second connection line electrically connected to the feed unit are provided on a second side of the dielectric substrate, and the first connection line and the second connection line are electrically connected to the first connection node and the second connection node through the first through-hole and the second through-hole, respectively. A third connection node disposed opposite the third through hole and a fourth connection node disposed opposite the fourth through hole are respectively provided on a side of the first receiving arm and the second receiving arm close to the dielectric substrate. The third connection node and the fourth connection node are provided at ends of the first receiving arm and the second receiving arm close to the center of the dielectric substrate. The third connection node and the fourth connection 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 evenly distributed circumferentially with the center of the dielectric substrate as the center. A first distance between the first through hole and the second through hole is 1 mm to 2 mm, and a second distance between the third through hole and the fourth through hole is 1 mm to 2 mm.

9. The ultra-wideband antenna according to claim 7, wherein: The circuit board includes a third connecting circuit and a fourth connecting circuit, wherein the third connecting circuit and the fourth connecting circuit are electrically connected to the first receiving arm and the second receiving arm respectively; The third connecting line and the fourth connecting line are L-shaped. The third connecting line includes a first horizontal section and a first vertical section. The first horizontal section is perpendicular to the dielectric substrate and opposite the third through hole. The first vertical section extends in a direction close to the extension line of the dielectric substrate center. The fourth connecting line includes a second horizontal section and a second vertical section. The second horizontal section is perpendicular to the dielectric substrate and opposite the fourth through hole. The second vertical section extends in a direction close to the extension line of the dielectric substrate center. The orthographic projections of the first connecting line and the second connecting line on the dielectric substrate are located within the orthographic projection range of the transmitting antenna on the dielectric substrate, and the orthographic projections of the third connecting line and the fourth connecting line on the dielectric substrate are located 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 to 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 surface of the transmitting antenna and the receiving antenna away from the dielectric substrate; The feeding unit includes a coaxial cable, wherein an inner conductor and an outer conductor of the coaxial cable are electrically connected to one of the first radiating arm and the second radiating arm respectively; The circuit board has an opening on one side close to the dielectric substrate, and the opening is used for the coaxial cable to pass through.

11. The ultra-wideband antenna according to any one of claims 1 to 6, characterized in that: The length of the ultra-wideband antenna is 19 mm-22 mm, the width of the ultra-wideband antenna is 19 mm-22 mm, the height of the ultra-wideband antenna is 12 mm-15 mm, and 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 to 4 mm, and the thickness of the dielectric substrate is 0.3 mm to 1 mm.

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