技术领域technical field
本发明属于微波天线技术领域，具体涉及波导缝隙天线技术领域中的一种有限带宽内大扫描角的串馈波导缝隙频率扫描天线，可用于雷达卫星等无线通信领域。The invention belongs to the technical field of microwave antennas, in particular to a series-fed waveguide slot frequency scanning antenna with a large scanning angle within a limited bandwidth in the technical field of waveguide slot antennas, which can be used in wireless communication fields such as radar satellites.
背景技术Background technique
对于雷达天线波瓣能作快速而灵活扫描的要求，仅靠天线的机械运动是无法实现的，于是人们就在雷达领域中引入电扫描天线技术。目前天线电扫描技术主要有以下几种:相位扫描、频率扫描、时延扫描和电子馈电开关扫描等。其中应用较多的是相位扫描和频率扫描。直接利用移相器控制天线阵中各个单元的馈电相位实现波束扫描，构成通常的相控阵天线。相控阵单元数比较多时，整体系统比较复杂，且制造成本昂贵。通过改变天线的工作频率来改变天线单元间的相位关系，也可实现波瓣指向的改变，即构成频率扫描天线。For the requirement that the radar antenna lobe can be scanned quickly and flexibly, it cannot be realized only by the mechanical movement of the antenna, so people introduce the electric scanning antenna technology in the radar field. At present, there are mainly the following kinds of antenna electrical scanning techniques: phase scanning, frequency scanning, delay scanning and electronic feed switch scanning. Among them, phase scanning and frequency scanning are more widely used. The phase shifter is directly used to control the feeding phase of each unit in the antenna array to realize beam scanning, which constitutes a common phased array antenna. When the number of phased array elements is relatively large, the overall system is relatively complicated and the manufacturing cost is expensive. By changing the operating frequency of the antenna to change the phase relationship between the antenna elements, it is also possible to change the direction of the lobe, that is, to form a frequency scanning antenna.
频率扫描天线通常为波导缝隙或微带贴片组成的直线阵或面阵结构。波导缝隙天线通过在波导上开缝使能量辐射出去，可分为行波型缝隙阵和驻波型缝隙阵。驻波型缝隙阵在工作频率改变时，性能急剧下降，不能用作频扫天线。行波型缝隙阵在工作频率改变时，各缝隙辐射波间存在相位差，天线阵列等相位面发生变化，因此通过改变频率就可以调节天线波束指向。但是，上述天线在窄频带内波束扫描角度较小，无法实现天线在窄频带内的宽角度波束扫描。并且在天线阵元数较多时，反射波在中心频点同相叠加，中心频点处损耗巨大导致天线不可用。The frequency scanning antenna is usually a linear array or an area array structure composed of waveguide slots or microstrip patches. The waveguide slot antenna radiates energy by opening slots in the waveguide, and can be divided into traveling wave slot arrays and standing wave slot arrays. The performance of the standing wave slot array decreases sharply when the operating frequency changes, so it cannot be used as a frequency-swept antenna. When the working frequency of the traveling wave slot array changes, there is a phase difference between the radiation waves of each slot, and the phase plane of the antenna array changes, so the antenna beam pointing can be adjusted by changing the frequency. However, the beam scanning angle of the above-mentioned antenna in the narrow frequency band is relatively small, and the wide-angle beam scanning of the antenna in the narrow frequency band cannot be realized. And when the number of antenna array elements is large, the reflected waves are superimposed in phase at the center frequency point, and the loss at the center frequency point is huge, making the antenna unusable.
例如，安徽耀峰雷达科技有限公司在其申请的名称为“有限带宽内基于混合馈电结构的低损耗频率扫描天线平面阵列”(申请号：CN201811256266.7，公开号：CN109193152A)的专利中提出了一种频率扫描天线，该频扫阵列由若干个平行子阵构成，包括双层微带贴片阵列、金属地板、E面弯波导、波导缝隙与微带线电磁耦合馈电结构、波导功分器、180°弯头。通过采用若干个平行子阵列，将窄边缝隙耦合的波导慢波线结构作为馈线，通过混合耦合馈电结构应用于阵列中。在所需工作带宽内扫描角度为-30.5°～29.5°。扫描范围小，而且馈电结构复杂。For example, Anhui Yaofeng Radar Technology Co., Ltd. proposed in the patent titled "Low-loss frequency scanning antenna planar array based on hybrid feed structure within limited bandwidth" (application number: CN201811256266.7, publication number: CN109193152A) A frequency scanning antenna is proposed. The frequency scanning array is composed of several parallel sub-arrays, including double-layer microstrip patch array, metal floor, E-plane curved waveguide, waveguide slot and microstrip line electromagnetic coupling feeding structure, waveguide work Splitter, 180° elbow. By adopting several parallel sub-arrays, the waveguide slow-wave line structure coupled with narrow-side slots is used as the feeder line, and the mixed-coupling feeder structure is applied to the array. The scanning angle is -30.5°～29.5° within the required working bandwidth. The scan range is small, and the feed structure is complex.
例如，南京理工大学在其申请的名称为“一种基于标准矩形波导的大角度混合馈电频率扫描天线”(申请号：CN201711328624.6，公开号：CN108155462A)的专利中提出了一种频率扫描天线，该频扫天线包括从上至下依次设置的标准矩形波导慢波线、下层微带、中间泡沫层和上层微带，标准矩形波导慢波线包括直线波导段和连接直线波导段的弯头，在直线波导段中心位置设置裂缝。该天线主波束扫描角范围为-46.3°～45.5°。该天线采用微带层、泡沫层、介质板来实现波导缝隙天线的大角度扫描，结构比较复杂。For example, Nanjing University of Science and Technology proposed a frequency scanning antenna in its patent application titled "A Large-angle Hybrid Feed Frequency Scanning Antenna Based on a Standard Rectangular Waveguide" (Application No.: CN201711328624.6, Publication No.: CN108155462A). The frequency-swept antenna includes a standard rectangular waveguide slow-wave line, a lower microstrip, a middle foam layer, and an upper microstrip arranged in sequence from top to bottom. The standard rectangular waveguide slow-wave line includes a straight waveguide section and a bend connecting the straight waveguide section. A crack is set at the center of the straight waveguide section. The main beam scanning angle range of this antenna is -46.3°～45.5°. The antenna uses a microstrip layer, a foam layer, and a dielectric plate to realize the large-angle scanning of the waveguide slot antenna, and the structure is relatively complicated.
发明内容Contents of the invention
本发明的目的在于克服上述现有技术的不足，提供一种有限带宽内大扫描角的串馈波导缝隙频率扫描天线，用于解决频扫天线扫描角度小和结构复杂的技术问题。The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a series-fed waveguide slot frequency scanning antenna with a large scanning angle within a limited bandwidth, which is used to solve the technical problems of small scanning angle and complex structure of the frequency scanning antenna.
为实现上述目的，一种有限带宽内大扫描角的串馈波导缝隙频率扫描天线，包括波导慢波结构、缝隙板和喇叭结构，所述的波导慢波结构由直线波导段和连接直线波导段的弯头组成，该弯头为180°弯头，弯头设有不同的倒角；所述的缝隙板覆盖于波导慢波结构的上方，且与直线波导段中心相对应的位置设置有N个缝隙，所述的喇叭结构由喇叭口和隔板组成，该喇叭口之间设置有与N个缝隙相对应的N+1个隔板，每个隔板分别位于缝隙板中相邻缝隙中心的上方，且与喇叭口构成一体；所述的喇叭结构关于Z轴对称分布。In order to achieve the above object, a series-fed waveguide slot frequency scanning antenna with a large scanning angle in a limited bandwidth includes a waveguide slow wave structure, a slot plate and a horn structure, and the waveguide slow wave structure is composed of a straight waveguide section and a connecting straight waveguide section The elbow is composed of a 180° elbow, and the elbow is provided with different chamfers; the slot plate is covered above the waveguide slow wave structure, and the position corresponding to the center of the linear waveguide section is provided with N slits, the horn structure is composed of bell mouths and baffles, N+1 baffles corresponding to the N slits are arranged between the bell mouths, and each baffle is located at the center of an adjacent slit in the slit plate above and integrally formed with the horn mouth; the horn structures are distributed symmetrically about the Z axis.
上述权利要求中，所述的隔板的高度表示为h1，厚度表示为hou，其中，h1为49.5mm～50.5mm，，hou为2.5mm～2.7mm。In the above claims, the height of the separator is expressed as h1, and the thickness is expressed as hou, wherein h1 is 49.5mm-50.5mm, and hou is 2.5mm-2.7mm.
上述权利要求中，所述的连接直线波导段的弯头的倒角半径随缝隙偏转角度的变化而改变，倒角半径表示为R，其中，R为7.3mm～7.85mm。In the above claims, the chamfering radius of the elbow connecting the linear waveguide sections changes with the variation of the deflection angle of the slot, and the chamfering radius is denoted as R, where R is 7.3 mm to 7.85 mm.
本发明与现有技术相比具有以下优点：Compared with the prior art, the present invention has the following advantages:
1、本发明采用的喇叭结构由喇叭口和隔板组成，该喇叭口之间设置有与N个缝隙相对应的N+1个隔板，每个隔板分别位于缝隙板中相邻缝隙中心的上方，且与喇叭口构成一体；仅利用喇叭结构弥补了慢波结构波导缝隙频扫天线的不足，克服了现有技术中波导缝隙频扫天线结构复杂的技术问题，采用串馈方式，馈电结构简单。1. The horn structure adopted in the present invention is composed of a bell mouth and a baffle, and N+1 baffles corresponding to N slits are arranged between the bell mouths, and each baffle is located at the center of the adjacent slit in the slit plate. It is integrated with the horn mouth; only the horn structure is used to make up for the deficiency of the slow-wave structure waveguide slot frequency-sweep antenna, and to overcome the technical problem of the complex structure of the waveguide slot frequency-sweep antenna in the prior art. The electrical structure is simple.
2、本发明采用的喇叭结构由喇叭口和隔板组成，该喇叭口之间设置有与N个缝隙相对应的N+1个隔板，隔板分别位于缝隙板中相邻缝隙中心的上方，且与喇叭口构成一体，减小了缝隙单元间互耦，使天线电参数在整个频段内保持平滑，实现了相对带宽有限条件下的宽角度扫描。2. The horn structure adopted in the present invention is composed of a bell mouth and a baffle, and N+1 baffles corresponding to the N slits are arranged between the bell mouths, and the baffles are respectively located above the centers of the adjacent slits in the slit plate , and it is integrated with the bell mouth, which reduces the mutual coupling between slot units, keeps the electrical parameters of the antenna smooth in the entire frequency band, and realizes wide-angle scanning under the condition of relatively limited bandwidth.
3、本发明通过对连接直线波导段弯头的倒角半径进行优化，针对不同的缝隙偏转角度使用不同倒角半径的弯头，减小了天线在中心频点处的回波损耗，降低了天线在中心频点处的驻波比。3. The present invention optimizes the chamfer radius of the elbow connecting the straight waveguide section, and uses elbows with different chamfer radii for different deflection angles of the slots, which reduces the return loss of the antenna at the center frequency point and reduces the The standing wave ratio of the antenna at the center frequency point.
附图说明Description of drawings
图1是本发明的整体结构示意图；Fig. 1 is the overall structural representation of the present invention;
图2是本发明的波导慢波结构示意图；Fig. 2 is a schematic diagram of the waveguide slow wave structure of the present invention;
图3是本发明的喇叭结构俯视图；Fig. 3 is a top view of the speaker structure of the present invention;
图4是本发明的喇叭结构主视图；Fig. 4 is the front view of horn structure of the present invention;
图5是本发明的回波损耗S11仿真结果图；Fig. 5 is the return loss S11 simulation result figure of the present invention;
图6是本发明的驻波比VSWR仿真结果图；Fig. 6 is the standing wave ratio VSWR simulation result figure of the present invention;
图7是本发明的辐射效率仿真结果图；Fig. 7 is the radiation efficiency simulation result figure of the present invention;
图8是本发明在15.7GHz、16.5GHz和17.2GHz频点的E面方向图；Fig. 8 is the E plane pattern of the present invention at 15.7GHz, 16.5GHz and 17.2GHz frequency points;
图9是本发明在16.5GHz频点的H面方向图；Fig. 9 is the H plane pattern at the 16.5GHz frequency point of the present invention;
具体实施方式Detailed ways
以下结合附图对本发明作进一步详细描述The present invention will be described in further detail below in conjunction with accompanying drawing
实施例1Example 1
参照图1、图2、图3和图4Refer to Figure 1, Figure 2, Figure 3 and Figure 4
一种有限带宽内大扫描角的串馈波导缝隙频率扫描天线，包括波导慢波结构1、缝隙板2和喇叭结构3，所述的波导慢波结构1由直线波导段1.1和连接直线波导段的弯头1.2组成，该弯头1.2为180°弯头，弯头设有不同的倒角；所述的缝隙板2覆盖于矩形慢波结构1的上方，且与直线波导段1.1中心相对应的位置设置有N个缝隙2.1，所述的喇叭结构3由喇叭口3.1和隔板3.2组成，该喇叭口3.1之间设置有N+1个隔板3.2，每个隔板3.2分别位于缝隙板2中相邻缝隙2.1中心的上方，所述的喇叭口3.1与隔板3.2构成一体；所述的喇叭结构3关于Z轴对称分布。A series-fed waveguide slot frequency scanning antenna with a large scanning angle within a limited bandwidth, comprising a waveguide slow wave structure 1, a slot plate 2 and a horn structure 3, the waveguide slow wave structure 1 is composed of a straight waveguide section 1.1 and a connecting straight waveguide section The elbow 1.2 is composed of an elbow 1.2, which is a 180° elbow, and the elbow is provided with different chamfers; the slotted plate 2 covers the top of the rectangular slow wave structure 1, and corresponds to the center of the linear waveguide section 1.1 N slots 2.1 are arranged at the position, and the horn structure 3 is composed of a bell mouth 3.1 and a partition 3.2, N+1 partitions 3.2 are arranged between the bell mouths 3.1, and each partition 3.2 is respectively located in the slot plate Above the center of the adjacent gap 2.1 in 2, the bell mouth 3.1 is integrated with the partition 3.2; the horn structure 3 is distributed symmetrically about the Z axis.
在波导缝隙频率扫描天线中，一般使用慢波结构来实现大角度扫描，但是在慢波结构频率扫描天线设计中，带宽、扫描角和损耗三者是一个互相制约的关系。带宽越窄，要实现宽角度的扫描，则所使用的慢波线就要长，相应的损耗就会增加。In the waveguide slot frequency scanning antenna, the slow wave structure is generally used to realize large-angle scanning, but in the design of the slow wave structure frequency scanning antenna, the bandwidth, scanning angle and loss are mutually restrictive. The narrower the bandwidth, the longer the slow wave line used to achieve wide-angle scanning, the corresponding loss will increase.
本发明天线采用泰勒加权。利用缝隙偏转角度不同会导致辐射效率不同，通过调节各缝隙偏转角度使各缝隙辐射效率服从泰勒分布。缝隙偏转角度不同，通过相同倒角半径的180°弯头的回波损耗也不同。由于波导缝隙频扫天线的反射波在中心频点处同相叠加，中心频点处的回波损耗很大，效率很低，天线无法使用，因此，针对不同缝隙偏转角度调整180°弯头的倒角半径，可以减小天线在中心频点处的回波损耗。The antenna of the present invention adopts Taylor weighting. Different slit deflection angles lead to different radiation efficiencies, and the radiation efficiency of each slit obeys the Taylor distribution by adjusting the deflection angles of each slit. The return loss through the 180° elbow with the same chamfer radius is also different for different slot deflection angles. Since the reflected waves of the waveguide slot frequency-swept antenna are superimposed in the same phase at the center frequency point, the return loss at the center frequency point is large, the efficiency is very low, and the antenna cannot be used. Therefore, the inverted angle of the 180° elbow is adjusted for different slot deflection angles The corner radius can reduce the return loss of the antenna at the center frequency point.
天线辐射场由各缝隙单元辐射场合成形成，相邻缝隙单元互相耦合，会导致天线性能下降，改变频率时，甚至会导致天线不可用。通过在喇叭中添加隔板，可以减小各缝隙单元间的互耦，降低频率改变对天线驻波比带来的影响，使天线驻波比在整个频段内更加平滑，在全频段可用。The antenna radiation field is formed by the synthesis of the radiation fields of each slot unit. Adjacent slot units are coupled to each other, which will cause the performance of the antenna to degrade, and even cause the antenna to be unusable when the frequency is changed. By adding partitions in the horn, the mutual coupling between each slot unit can be reduced, and the impact of frequency changes on the antenna standing wave ratio can be reduced, making the antenna standing wave ratio smoother and available in the entire frequency band.
所述的隔板3.2的高度表示为h1，厚度表示为hou，其中，h1为49.5mm～50.5mm，，hou为2.5mm～2.7mm。本发明中h1优选为49.7mm，hou优选为2.6mm。The height of the partition 3.2 is expressed as h1, and the thickness is expressed as hou, wherein h1 is 49.5mm-50.5mm, and hou is 2.5mm-2.7mm. In the present invention, h1 is preferably 49.7 mm, and hou is preferably 2.6 mm.
所述的连接直线波导段的弯头1.2的倒角半径随缝隙偏转角度的变化而改变，半径表示为R，其中，R为7.3mm～7.85mm。本发明中R优选为7.7mm。The chamfer radius of the elbow 1.2 connecting the linear waveguide section changes with the variation of the deflection angle of the slot, and the radius is denoted as R, where R is 7.3 mm to 7.85 mm. In the present invention, R is preferably 7.7 mm.
实施例2Example 2
所述的隔板3.2的高度表示为h1，厚度表示为hou，其中，h1为49.5mm～50.5mm，，hou为2.5mm～2.7mm。本发明中h1为49.5mm，hou优选为2.5mm。The height of the partition 3.2 is expressed as h1, and the thickness is expressed as hou, wherein h1 is 49.5mm-50.5mm, and hou is 2.5mm-2.7mm. In the present invention, h1 is 49.5 mm, and hou is preferably 2.5 mm.
所述的连接直线波导段的弯头1.2的倒角半径随缝隙偏转角度的变化而改变，半径表示为R，其中，R为7.3mm～7.85mm。本发明中R为7.3mm。The chamfer radius of the elbow 1.2 connecting the linear waveguide section changes with the variation of the deflection angle of the slot, and the radius is denoted as R, where R is 7.3 mm to 7.85 mm. In the present invention, R is 7.3 mm.
实施例3Example 3
所述的隔板3.2的高度表示为h1，厚度表示为hou，其中，h1为49.5mm～50mm，，hou为2.5mm～2.7mm。本发明中h1为50mm，hou优选为2.7mm。The height of the partition 3.2 is expressed as h1, and the thickness is expressed as hou, wherein h1 is 49.5mm-50mm, and hou is 2.5mm-2.7mm. In the present invention, h1 is 50 mm, and hou is preferably 2.7 mm.
所述的连接直线波导段的弯头1.2的倒角半径随缝隙偏转角度的变化而改变，半径表示为R，其中，R为7.3mm～7.85mm。本发明中R为7.85mm。The chamfer radius of the elbow 1.2 connecting the linear waveguide section changes with the variation of the deflection angle of the slot, and the radius is denoted as R, where R is 7.3 mm to 7.85 mm. In the present invention, R is 7.85 mm.
以下结合仿真实验对本发明作进一步详细描述Below in conjunction with simulation experiment the present invention is described in further detail
参照图5、图6、图7、图8和图9Referring to Figure 5, Figure 6, Figure 7, Figure 8 and Figure 9
仿真内容及分析：Simulation content and analysis:
利用商业电磁仿真软件CST MICROWAVE STUDIO 2019对上述实施例在15.7GHz～17.2GHz范围内仿真计算。The commercial electromagnetic simulation software CST MICROWAVE STUDIO 2019 was used to simulate and calculate the above embodiments in the range of 15.7GHz to 17.2GHz.
图5为本发明的回波损耗S11仿真结果图。如图所示，横坐标为频率，单位为GHz，纵坐标为回波损耗，单位为dB；在全频段内回波损耗S11<-10dB，性能良好，中心频点处回波损耗S11最大，为-10dB。FIG. 5 is a graph of the simulation result of the return loss S11 of the present invention. As shown in the figure, the abscissa is the frequency, the unit is GHz, and the ordinate is the return loss, the unit is dB; the return loss S11<-10dB in the whole frequency band has good performance, and the return loss S11 is the largest at the center frequency point. -10dB.
图6为本发明的驻波比VSWR仿真结果图。如图所示，横坐标为频率，单位为GHz，纵坐标为驻波比；在全频段内驻波比VSWR<2。除中心频点处驻波比达到1.9外，其余各频点处驻波比均小于1.5，性能良好。Fig. 6 is a graph of the VSWR simulation result of the present invention. As shown in the figure, the abscissa is the frequency, the unit is GHz, and the ordinate is the standing wave ratio; the standing wave ratio VSWR<2 in the whole frequency band. Except the standing wave ratio at the center frequency point reaches 1.9, the standing wave ratio at other frequency points is less than 1.5, and the performance is good.
图7为本发明的辐射效率仿真结果图。如图所示，横坐标为频率，单位为GHz，纵坐标为辐射效率，单位为dB；由于中心频点处损耗较高导致辐射效率低于其他频点，但相差不超过1dB；除中心频点外其他频点辐射效率相差不超过0.4dB，曲线较为平稳，保证了天线在全频段可正常使用。Fig. 7 is a graph showing the simulation results of radiation efficiency of the present invention. As shown in the figure, the abscissa is the frequency, the unit is GHz, and the ordinate is the radiation efficiency, the unit is dB; due to the high loss at the center frequency point, the radiation efficiency is lower than other frequency points, but the difference does not exceed 1dB; except for the center frequency The difference in radiation efficiency of other frequency points outside the point does not exceed 0.4dB, and the curve is relatively stable, which ensures that the antenna can be used normally in the entire frequency band.
图8为本发明在15.7GHz、16.5GHz和17.2GHz频点的E面方向仿真图。横坐标为角度，单位为度，纵坐标为增益，单位为dBi；Fig. 8 is a simulation diagram of the E-plane direction of the present invention at frequency points of 15.7GHz, 16.5GHz and 17.2GHz. The abscissa is the angle, the unit is degree, the ordinate is the gain, the unit is dBi;
如图8(a)所示，在15.7GHz，天线波束指向-63.3°，3dB波束宽度为4.5°，副瓣电平为-23.5dB，增益为26.4dBi；As shown in Figure 8(a), at 15.7GHz, the antenna beam points to -63.3°, the 3dB beamwidth is 4.5°, the sidelobe level is -23.5dB, and the gain is 26.4dBi;
如图8(b)所示，在16.5GHz，天线波束指向0.8°，3dB波束宽度为2.4°，副瓣电平为-22.1dB，增益为30dBi；As shown in Figure 8(b), at 16.5GHz, the antenna beam points to 0.8°, the 3dB beamwidth is 2.4°, the sidelobe level is -22.1dB, and the gain is 30dBi;
如图8(c)所示，在17.2GHz，天线波束指向46.3°，3dB波束宽度为4°，副瓣电平为-28.2dB，增益为29dBi。As shown in Figure 8(c), at 17.2GHz, the antenna beam points to 46.3°, the 3dB beamwidth is 4°, the sidelobe level is -28.2dB, and the gain is 29dBi.
图9为本发明在16.5GHz频点的H面方向仿真图。如图所示，横坐标为角度，单位为度，纵坐标为增益，单位为dBi；3dB波束宽度为11.6°，副瓣电平为-21.7dB，增益为30dBi。俯仰维的波束宽度约为10°左右。FIG. 9 is a simulation diagram of the H plane direction at the frequency point of 16.5 GHz according to the present invention. As shown in the figure, the abscissa is the angle in degrees, and the ordinate is the gain in dBi; the 3dB beam width is 11.6°, the sidelobe level is -21.7dB, and the gain is 30dBi. The beamwidth in the pitch dimension is about 10°.
可知，本发明设计天线，工作频段为15.7～17.2GHz，水平扫描角可达110°，3dB波束宽度在频带中心为2.5°，在频带两端为4.5°，副瓣电平＜-20dB，增益＞25dBi，在相对带宽有限的情况下增大了天线的扫描角，性能良好。It can be seen that the antenna designed by the present invention has a working frequency band of 15.7-17.2 GHz, a horizontal scanning angle of up to 110°, a 3dB beam width of 2.5° at the center of the frequency band, and 4.5° at both ends of the frequency band, side lobe level <-20dB, and gain >25dBi, the scanning angle of the antenna is increased under the condition of relatively limited bandwidth, and the performance is good.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673117.9ACN110504547B (en) | 2019-07-24 | 2019-07-24 | A Cross-Fed Waveguide Slot Frequency Scanning Antenna with Large Scanning Angle in Limited Bandwidth |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673117.9ACN110504547B (en) | 2019-07-24 | 2019-07-24 | A Cross-Fed Waveguide Slot Frequency Scanning Antenna with Large Scanning Angle in Limited Bandwidth |
| Publication Number | Publication Date |
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| CN110504547Atrue CN110504547A (en) | 2019-11-26 |
| CN110504547B CN110504547B (en) | 2021-02-02 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910673117.9AActiveCN110504547B (en) | 2019-07-24 | 2019-07-24 | A Cross-Fed Waveguide Slot Frequency Scanning Antenna with Large Scanning Angle in Limited Bandwidth |
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