A high front-to-back ratio symmetrical radiating magnetic electric dipole antenna covering the whole Ku band

Abstract

The application discloses a high front-to-back ratio symmetrical radiation magnetic electric dipole antenna covering full Ku band, and belongs to the technical field of antennas. The antenna comprises four layers of dielectric substrates and upper and lower metal ground plates; four rectangular radiation patches and four peripheral truncated rectangular parasitic patches are arranged on the upper surface of the first dielectric substrate, the rectangular radiation patches are short-circuited to the lower metal ground plate through metal through holes to form a central short-circuit radiation structure; the truncated rectangular parasitic patches are connected with the first metal disc on the third dielectric substrate through first metal blind holes to form an L-shaped parasitic structure; a feeding patch is arranged at the center of the first dielectric substrate and is connected with a bottom feeding connector through second and third metal blind holes and an extended microstrip line. The application eliminates parasitic coupling current through the truncated rectangular parasitic patch to ensure the symmetry of the directional diagram, optimizes the magnetic current distribution through the L-shaped parasitic structure to improve the front-to-back ratio, realizes wide impedance bandwidth, high gain flatness and compact structure in the 12-18 GHz frequency band, and is suitable for Ku band satellite communication and radar systems.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more particularly to a high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band. By introducing a truncated rectangular parasitic patch and an L-shaped parasitic structure, this antenna effectively suppresses parasitic coupling currents introduced by feed bias, achieving a symmetrical and stable radiation pattern and a high front-to-back ratio across the entire frequency band. It possesses advantages such as wide impedance bandwidth, high gain flatness, and compact structure, making it particularly suitable for Ku-band satellite communications, radar systems, and high-throughput wireless networks where high front-to-back ratio, stable radiation, and wide bandwidth are required. Background Technology

[0002] The Ku band (12-18 GHz) is a critical frequency band for satellite communications, radar systems, and high-throughput wireless networks, requiring antennas to possess both wide impedance bandwidth and stable radiation characteristics. A high front-to-back ratio (FBR) is crucial for suppressing interference from adjacent systems, improving isolation between co-located transceiver modules, and ensuring efficient power transmission within the target coverage area. Simultaneously, radiation pattern symmetry and gain stability are equally important for achieving consistent coverage and reliable system integration.

[0003] To improve the front-to-back ratio, researchers have explored various technical solutions. Reflective structures (such as cavity back reflectors and metamaterial-based ground planes) can effectively suppress back radiation, but they usually increase the antenna footprint and profile height. Higher-order mode excitation provides an alternative approach, but it is often limited by the operating bandwidth and complex mode control. The use of short-circuit pins and parasitic elements in traveling wave or end-fire structures has also been studied, but these methods often suffer from impedance mismatch or deterioration of the front-to-back ratio at the bandwidth edges.

[0004] Among various candidate solutions, magnetoelectric (ME) dipole antennas have proven particularly effective, utilizing constructive interference between orthogonal electric and magnetic dipoles to achieve unidirectional radiation and suppress back lobes. Several implementation schemes have been reported to further improve the front-to-back ratio, including dielectric resonator loading for compact complementary source radiation, short-circuit pins or artificial structures to harmonize competing resonances over a wide bandwidth, and the introduction of magnetoelectric dipole directors to simultaneously improve gain and front-to-back ratio.

[0005] However, despite the progress made, many magnetoelectric dipole antenna designs are still subject to three persistent limitations: limited effective bandwidth, asymmetric radiation pattern, and gain fluctuations within the operating frequency band—all of which impair radiation stability and limit practical deployment capabilities.

[0006] To mitigate pattern asymmetry, researchers have proposed various structural improvements, including dielectric loading, compensated slot configurations, and rotationally symmetric architectures. However, these methods often involve inherent trade-offs—such as increased design complexity, reduced gain, or limited bandwidth—and have not yet been effectively adapted to magnetoelectric dipole configurations covering the entire Ku-band.

[0007] Therefore, developing a full Ku-band magnetoelectric dipole antenna that can seamlessly integrate wide impedance bandwidth, high front-to-back ratio, perfect pattern symmetry, and stable gain remains an urgent challenge. Summary of the Invention

[0008] To address the aforementioned issues, this invention proposes a high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band. This antenna effectively eliminates parasitic coupling currents introduced by the feed bias, ensuring pattern symmetry; and it shifts the magnetic current distribution upwards, bringing the magnetic phase center closer to the electrical phase center, thereby significantly improving the front-to-back ratio.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, and a fourth dielectric substrate arranged sequentially from top to bottom. An upper metal ground plane and a lower metal ground plane are respectively provided on the lower surface of the third dielectric substrate and the lower surface of the fourth dielectric substrate.

[0010] The upper surface of the first dielectric substrate is provided with four rectangular radiating patches. Each rectangular radiating patch is connected to the bottom metal ground plane through a metal through hole, forming a central short-circuit radiating structure for generating electric dipole radiation.

[0011] Four truncated rectangular parasitic patches are symmetrically arranged around the central short-circuit radiating structure on the outer periphery of the upper surface of the first dielectric substrate. The upper surface of the third dielectric substrate has a first metal disk, which corresponds one-to-one with each truncated rectangular parasitic patch, and the first metal disk is located directly below the corresponding truncated rectangular parasitic patch. Each truncated rectangular parasitic patch is connected to the corresponding first metal disk through a first metal blind via, together forming an L-shaped parasitic structure used to optimize the magnetic current distribution of the antenna.

[0012] A power feed patch is disposed at the center of the upper surface of the first dielectric substrate. A second metal blind via and a third metal blind via are respectively disposed at the bottom of both ends of the power feed patch. The upper surface of the second dielectric substrate has a second metal disk, wherein the second metal blind via is vertically disposed and connected to the second metal disk. The bottom end of the third metal blind via penetrates the upper metal ground plane and extends to the lower metal ground plane, and the third metal blind via has no electrical contact with either the upper or lower metal ground plane, forming a power feed port.

[0013] The lower metal ground plane has an elongated aperture for clearance, through which an extended microstrip line is disposed. The lower surface of the lower metal ground plane has a feed connector. The inner conductor of the feed connector is connected to a third metal blind via the extended microstrip line, and the outer conductor of the feed connector is connected to the lower metal ground plane, thereby enabling the feeding of radio frequency signals.

[0014] Furthermore, the main body of the truncated rectangular parasitic patch is a rectangular patch with a missing corner, where "missing corner" means that a small rectangle is cut off at one of the corners of the rectangular patch.

[0015] Furthermore, the four rectangular radiating patches are arranged in a 2×2 rectangular array; the four truncated rectangular parasitic patches correspond one-to-one with the four rectangular radiating patches, the truncated rectangular parasitic patches are located outside the corresponding rectangular radiating patches and are adjacent to the wide side of the rectangular radiating patches; the notches of adjacent truncated rectangular parasitic patches face each other and are close to the power feeding patch.

[0016] Furthermore, each metal via is located at an inner corner of the rectangular radiating patch, and the metal via penetrates the upper metal ground plane and contacts the upper metal ground plane to achieve a short-circuit connection.

[0017] Furthermore, the first dielectric substrate is made of F4BTMS265 material, with a dielectric constant εr=2.65 and a loss tangent tanδ=0.0014.

[0018] Furthermore, a prepreg adhesive layer is provided between the first dielectric substrate and the second dielectric substrate, between the second dielectric substrate and the third dielectric substrate, and between the third dielectric substrate and the fourth dielectric substrate. The prepreg adhesive layer is made of FR28 material with a dielectric constant εr=2.74, a loss tangent tanδ=0.0017, and a thickness of 0.1mm.

[0019] Furthermore, the long side of the truncated rectangular parasitic patch is perpendicular to the long side of the rectangular radial patch.

[0020] Compared with the prior art, the present invention has the following significant advantages: This invention employs a truncated rectangular parasitic patch, which effectively eliminates the parasitic coupling current introduced by the feed bias, enabling the antenna to achieve perfect pattern symmetry across the entire Ku band. The gain difference in the E-plane θ=±60° is reduced from 5.4dB to only 0.6dB.

[0021] This invention utilizes an L-shaped parasitic structure composed of a metal blind hole and a metal disk to shift the magnetic current distribution upwards, bringing the magnetic phase center closer to the electrical phase center and significantly improving the front-to-back ratio. The front-to-back ratio reaches 22.3~31.5dB, which is significantly better than similar designs.

[0022] This invention achieves a wide impedance bandwidth, with S11 < -10dB across the entire Ku band from 12 to 18 GHz, an impedance bandwidth of 40%, and a radiation efficiency of over 85%.

[0023] The present invention has good gain stability, with a gain of 5.92~6.58dBi and a fluctuation of only 0.66dB within the operating frequency band.

[0024] The present invention has a compact structure, with an overall antenna size of only 0.38λ0 × 0.38λ0 × 0.11λ0 (λ0 is the free space wavelength), which makes it easy to integrate into various Ku-band wireless communication devices. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded structure according to an embodiment of the present invention; Figure 3 This is a top-view perspective structural diagram of an embodiment of the present invention; Figure 4 This is a side view structural diagram of an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the metal grounding plate according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the metal grounding plate in an embodiment of the present invention.

[0027] Figure 7 This is a diagram of return loss parameters according to an embodiment of the present invention; Figure 8 This is a diagram showing the antenna gain parameters of an embodiment of the present invention; Figure 9 This is the normalized radiation pattern at 12 GHz according to an embodiment of the present invention; Figure 10 This is the normalized radiation pattern at 18 GHz according to an embodiment of the present invention.

[0028] The meanings of the markings in the diagram are as follows: 1—Multilayer dielectric substrate, 2—Rectangular radiating patch, 3—First metal blind via, 4—Metal through-hole, 5—Truncation rectangular parasitic patch, 6—Feed via, 7—Feed patch, 8—Third metal blind via, 9—Second metal blind via, 10—First dielectric substrate, 11—First prepreg adhesive layer, 12—Second dielectric substrate, 13—Second prepreg adhesive layer, 14—Third dielectric substrate, 15—Third prepreg adhesive layer, 16—Fourth dielectric substrate, 17—Feed connector, 18—Extended microstrip line, 19—Avoidance elongated via, 20—Lower metal ground plane, 21—Upper metal ground plane. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-10 The specific embodiments of the present invention will be described in further detail below. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] I. Overall Antenna Structure and Stacking Relationship As attached Figure 1 , Figure 2 and Figure 4 As shown, the present invention provides a high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band (12–18 GHz), employing a multilayer dielectric substrate stacked structure, comprising a first dielectric substrate 10, a second dielectric substrate 12, a third dielectric substrate 14, and a fourth dielectric substrate 16 arranged sequentially from top to bottom. Each dielectric substrate is tightly bonded together by a first prepreg adhesive layer 11, a second prepreg adhesive layer 13, and a third prepreg adhesive layer 15, respectively, forming an integrated multilayer dielectric substrate 1.

[0031] In this embodiment, the first dielectric substrate 10, the second dielectric substrate 12, the third dielectric substrate 14, and the fourth dielectric substrate 16 are all made of F4BTMS265 material, with a dielectric constant εr = 2.65 and a loss tangent tanδ = 0.0014. Each prepreg adhesive layer is made of FR28 material, with a dielectric constant εr = 2.74, a loss tangent tanδ = 0.0017, and a single-layer thickness of 0.1 mm. This material combination exhibits excellent dielectric properties and low loss characteristics, effectively supporting stable transmission of Ku-band high-frequency signals and is suitable for mass production.

[0032] As attached Figure 4 and attached Figure 6 As shown, the lower surface of the third dielectric substrate 14 is provided with an upper metal ground plane 21, and the lower surface of the fourth dielectric substrate 16 is provided with a lower metal ground plane 20. The two metal ground planes together constitute the ground plane system of the antenna, providing a stable reference ground for the radiating structure and the feed network.

[0033] II. Composition and Function of Central Short-Circuit Radiation Structure As attached Figure 2 and attached Figure 3 As shown, four rectangular radiating patches 2 are disposed on the upper surface of the first dielectric substrate 10. The four rectangular radiating patches 2 are evenly arranged in a 2×2 rectangular array, forming the core part of the central short-circuit radiating structure.

[0034] Each rectangular radiating patch 2 is connected to the lower metal ground plane 20 at the bottom through a metal through hole 4. Specifically, each metal through hole 4 is located at the inner corner of the corresponding rectangular radiating patch 2, and the metal through hole 4 penetrates through the upper metal ground plane 21 and makes electrical contact with the upper metal ground plane 21, thereby achieving a short-circuit connection. This central short-circuit radiating structure is used to generate stable electric dipole radiation, which is the basis for the antenna to achieve wideband operation.

[0035] Its working principle is as follows: the rectangular radiation patch 2 is short-circuited to the ground plane through the metal through hole 4 to form an equivalent electric dipole radiation source, which, in conjunction with the subsequent magnetic dipole radiation, realizes complementary radiation of magnetoelectric dipoles, thereby obtaining unidirectional radiation characteristics and a stable axial beam.

[0036] III. Composition, Coordination, and Function of the Truncate Rectangular Parasitic Patch and the L-Shaped Parasitic Structure As attached Figure 2 and attached Figure 3 As shown, four truncated rectangular parasitic patches 5 are also disposed on the outer periphery of the upper surface of the first dielectric substrate 10. The four truncated rectangular parasitic patches 5 correspond one-to-one with the four rectangular radiating patches 2, located outside the corresponding rectangular radiating patches 2, and adjacent to the wide side of the rectangular radiating patches 2. At the same time, the long side of the truncated rectangular parasitic patches 5 is perpendicular to the long side of the rectangular radiating patches 2, forming an orthogonal arrangement.

[0037] The main body of the truncated rectangular parasitic patch 5 is a rectangular patch with a missing corner, where "missing corner" refers to cutting off a small rectangle at one corner of the rectangular patch. The missing corners of adjacent truncated rectangular parasitic patches 5 are positioned opposite each other and are close to the feed patch 7 at the center. This unique asymmetrical truncation design effectively eliminates parasitic coupling current induced on the parasitic patch due to feed bias, thereby ensuring that the antenna's radiation pattern remains highly symmetrical throughout the Ku-band.

[0038] As attached Figure 2 and attached Figure 4 As shown, a first metal disk is disposed on the upper surface of the third dielectric substrate 14, and the first metal disk is connected to the upper end of the first metal blind via 3. Each first metal disk corresponds to a truncated rectangular parasitic patch 5, and the first metal disk is located directly below the corresponding truncated rectangular parasitic patch 5. Each truncated rectangular parasitic patch 5 is connected to the corresponding first metal disk through a vertically arranged first metal blind via 3, together forming an L-shaped parasitic structure.

[0039] Its working mechanism is as follows: The L-shaped parasitic structure forms a conductive path in the vertical direction, consisting of a truncated rectangular parasitic patch 5, a first metal blind hole 3, and a first metal disk, which is equivalent to introducing additional parasitic resonant modes around the radiating structure. This structure shifts the antenna's magnetic current distribution upward, making the magnetic phase center and the electrical phase center more spatially closer, thereby significantly enhancing the front-to-back radiation ratio. Results show that this design achieves a front-to-back radiation ratio of 22.3~31.5dB, significantly better than similar conventional designs.

[0040] IV. Structure, Coordination, and Signal Transmission Principles of Power Supply Networks As attached Figure 2 , Figure 3 and Figure 4 As shown, a power feed patch 7 is disposed at the center of the upper surface of the first dielectric substrate 10. The power feed patch 7 spans the central region of the central short-circuit radiating structure and is used to couple external radio frequency signals to the four rectangular radiating patches 2.

[0041] The bottom of each end of the power supply patch 7 is provided with a second metal blind hole 9 and a third metal blind hole 8, respectively. Wherein: The upper surface of the second dielectric substrate 12 has a second metal disk, and a second metal blind hole 9 is vertically arranged and connected to the second metal disk to form an open circuit support structure for providing mechanical support and appropriate impedance matching.

[0042] The bottom end of the third metal blind hole 8 passes through the upper metal ground plane 21 and extends to the lower metal ground plane 20, but the third metal blind hole 8 has no electrical contact with the upper metal ground plane 21 and the lower metal ground plane 20. That is, it passes through the clearance hole on the ground plane, thus forming a signal feed port.

[0043] As attached Figure 5 As shown, the lower metal ground plane 20 has an elongated clearance hole 19, in which an extended microstrip line 18 is disposed. The lower surface of the lower metal ground plane 20 is provided with a power supply connector 17, which is preferably an SSMP type ultra-miniature RF coaxial connector, suitable for reliable transmission of high-frequency signals.

[0044] The inner conductor of the feed connector 17 is electrically connected to the third metal blind aperture 8 via the extended microstrip line 18, while the outer conductor of the feed connector 17 is connected to the lower metal ground plane 20. After the radio frequency signal enters through the feed connector 17, it is transmitted to the third metal blind aperture 8 via the extended microstrip line 18, and then the four rectangular radiating patches 2 are excited by electromagnetic coupling through the feed patch 7, thereby achieving balanced feeding of the antenna.

[0045] The feed network adopts a transition structure that combines vertical blind vias and microstrip lines, which effectively avoids the asymmetric radiation problem introduced by traditional coplanar feed lines, while reducing feed losses and ensuring impedance matching across the entire frequency band.

[0046] V. Analysis of the Overall Working Principle of the Antenna The antenna described in this invention constitutes a magnetoelectric dipole radiation system as a whole, and its working principle can be summarized as follows: Electric dipole radiation: Four rectangular radiating patches 2 are short-circuited to the ground plane through metal through holes 4 to form an equivalent electric dipole, which mainly produces horizontally polarized electric field radiation.

[0047] Magnetic dipole radiation: The ring-shaped equivalent magnetic current is generated by the gap electric field between the central short-circuit radiation structure and the surrounding ground plane, forming a vertically polarized magnetic field radiation.

[0048] Complementary interference: Electric dipoles and magnetic dipoles produce constructive interference in the far-field region, achieving unidirectional axial radiation while effectively suppressing back radiation.

[0049] Pattern symmetry assurance: Cutting off the rectangular parasitic patch 5 eliminates parasitic coupling current and ensures the symmetry of the E-plane and H-plane.

[0050] Improved front-to-back ratio: The L-shaped parasitic structure (first metal blind hole 3 + first metal disk) optimizes the magnetic current distribution, reduces the center distance of the magnetoelectric phase, and further improves the front-to-back ratio.

[0051] VI. Actual Antenna Dimensions In this embodiment, the preferred dimensions (in millimeters) of the key antenna structures are: a=2.6, b=1.3; c=4.5, d=0.45, e=3.6; f=0.8, g=1.8; h=1, i=1.4, j=0.7; k=0.1, l=1.27, m=1, n=0.254; o=9.5.

[0052] VII. Antenna Performance and Effect Verification As attached Figure 7 As shown, the antenna of this invention exhibits a return loss S11 significantly less than -10dB across the entire Ku band from 12GHz to 18GHz, an impedance bandwidth of 40% (based on a center frequency of 15GHz), and a radiation efficiency consistently maintained above 85%, fully demonstrating its wideband matching capability.

[0053] As attached Figure 8 As shown, within the operating frequency band, the antenna gain is 5.92~6.58dBi, with a gain fluctuation of only 0.66dB, exhibiting an extremely flat gain response, which is beneficial for the system to maintain stable coverage capability throughout the entire frequency band.

[0054] As attached Figure 9As shown, at the 12GHz low-frequency point, the normalized radiation patterns of the antenna's E-plane and H-plane both exhibit standard axial radiation characteristics, with good pattern symmetry and no obvious beam tilt or distortion.

[0055] As attached Figure 10 As shown, at the 18GHz high frequency point, the antenna still maintains excellent axial radiation and pattern symmetry, with a front-to-back ratio of 22.3~31.5dB, which verifies the effective guarantee of pattern symmetry and high front-to-back ratio of the truncated rectangular parasitic patch and L-shaped parasitic structure at the high frequency end.

[0056] VIII. Structural Compactness and Application Prospects After optimization, the overall structural dimensions of this invention result in an antenna footprint of only 0.38λ0 × 0.38λ0 and a profile height of only 0.11λ0 (λ0 being the free-space wavelength), exhibiting excellent structural compactness. This facilitates integration into various Ku-band satellite communication terminals, airborne radar arrays, phased array systems, and high-throughput wireless network equipment, making it particularly suitable for applications with stringent requirements for front-to-back ratio and radiation symmetry. By introducing a truncated rectangular parasitic patch and an L-shaped parasitic structure, this antenna effectively suppresses parasitic coupling currents introduced by feed bias, achieving a symmetrical and stable radiation pattern and high front-to-back ratio across the entire frequency band. It also boasts advantages such as wide impedance bandwidth, high gain flatness, and compact structure, making it especially suitable for Ku-band satellite communication, radar systems, and high-throughput wireless networks where high front-to-back ratio, stable radiation, and wide bandwidth are required.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku band, comprising a first dielectric substrate (10), a second dielectric substrate (12), a third dielectric substrate (14), and a fourth dielectric substrate (16) arranged sequentially from top to bottom; characterized in that: The lower surface of the third dielectric substrate (14) and the lower surface of the fourth dielectric substrate (16) are respectively provided with an upper metal ground plane (21) and a lower metal ground plane (20). The upper surface of the first dielectric substrate (10) is provided with four rectangular radiating patches (2), each rectangular radiating patch (2) is connected to the bottom lower metal ground plane (20) through a metal through hole (4) to form a central short-circuit radiating structure. The upper surface of the first dielectric substrate (10) is also provided with four truncated rectangular parasitic patches (5), which are symmetrically arranged around the central short-circuit radiation structure; the upper surface of the third dielectric substrate (14) has a first metal disk, which corresponds one-to-one with the truncated rectangular parasitic patches (5). The first metal disk is located directly below the corresponding truncated rectangular parasitic patch (5), and the truncated rectangular parasitic patches (5) are all connected to the corresponding metal disk through the first metal blind hole (3). A power feeding patch (7) is provided at the center of the upper surface of the first dielectric substrate (10); a second metal blind hole (9) and a third metal blind hole (8) are respectively provided at the bottom of the two ends of the power feeding patch (7); a second metal disk is provided on the upper surface of the second dielectric substrate (12); the second metal blind hole (9) is vertically arranged and connected to the second metal disk; the bottom end of the third metal blind hole (8) extends through the upper metal ground plane (21) to the lower metal ground plane (20); the third metal blind hole (8) has no contact with the upper metal ground plane (21) and the lower metal ground plane (20); The lower metal ground plane (20) has an obstruction elongated hole (19), in which an extended microstrip line (18) is provided; the lower surface of the lower metal ground plane (20) has a power supply connector (17), the inner conductor of the power supply connector (17) is connected to the third metal blind hole (8) through the extended microstrip line (18), and the outer conductor of the power supply connector (17) is connected to the lower metal ground plane (20).

2. The high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band according to claim 1, characterized in that, The main body of the truncated rectangular parasitic patch (5) is a rectangular patch with a missing corner, where the missing corner means that a rectangle is cut off at one corner of the rectangular patch.

3. The high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku band according to claim 2, characterized in that, The four rectangular radiating patches (2) are arranged in a 2×2 rectangular array; the four truncated rectangular parasitic patches (5) correspond one-to-one with the four rectangular radiating patches (2), the truncated rectangular parasitic patches (5) are located outside the corresponding rectangular radiating patches (2) and are close to the wide side of the rectangular radiating patches (2); the missing corners of adjacent truncated rectangular parasitic patches (5) are facing each other and are close to the power feeding patch (7).

4. The high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku band according to claim 1, characterized in that, Each metal through hole (4) is located at the inner corner of the rectangular radiating patch (2), and the metal through hole (4) penetrates the upper metal ground plane (21) and contacts the upper metal ground plane (21).

5. A high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku band according to claim 1, characterized in that, The first dielectric substrate (10) is made of F4BTMS265 material with dielectric constant εr=2.65 and loss tangent tanδ=0.0014.

6. A high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band according to claim 1, characterized in that, A first prepreg adhesive layer (11), a second prepreg adhesive layer (13), and a third prepreg adhesive layer (15) are respectively provided between the first dielectric substrate (10) and the second dielectric substrate (12), between the second dielectric substrate (12) and the third dielectric substrate (14), and between the third dielectric substrate (14) and the fourth dielectric substrate (16). The prepreg adhesive layer is made of FR28 material with a dielectric constant εr=2.74, a loss tangent tanδ=0.0017, and a thickness of 0.1mm.

7. A high front-to-back ratio symmetrical radiating magnetoelectric dipole antenna covering the entire Ku-band according to claim 3, characterized in that, The long side of the truncated rectangular parasitic patch (5) is perpendicular to the long side of the rectangular radiating patch (2).

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