Dual-band circularly polarized satellite antenna and terminal electronics

Abstract

This invention provides a dual-frequency circularly polarized satellite antenna and a terminal electronic device. The first radiating component and the second radiating component are each composed of two or more radiators. A first feeding structure component and a second feeding structure component are correspondingly connected to the first and second radiating components, feeding the first and second radiating components in a sequentially rotated phase manner based on a feeding network to achieve dual-frequency circularly polarized radiation. The first radiating component is configured to resonate in a high-frequency band, and the second radiating component is configured to resonate in a low-frequency band. A first short-circuit structure component and a second short-circuit structure component are correspondingly connected to the first and second radiating components, used to short-circuit the first and second radiating components to a metallic ground. An isolation structure, including a spatial isolation structure and a port isolation structure, is configured to improve the isolation between the first and second radiating components.

Description

Technical Field

[0001] This invention belongs to the field of wireless communication technology, and particularly relates to a dual-frequency circularly polarized satellite antenna and terminal electronic equipment. Background Technology

[0002] The VHF (Very High Frequency) band, due to its stable propagation characteristics and strong diffraction capability, has become one of the core operating frequency bands for satellite communication and is widely used in various mobile and portable communication terminals and fixed station equipment. Circularly polarized antennas can effectively solve problems such as polarization mismatch, multipath interference, and complex application environments in satellite communication transmission, and are a core development direction for satellite antennas. In the current antenna development process, satellite communication antennas are increasingly trending towards integrated transceiver designs, and are becoming more miniaturized, integrated, and lightweight.

[0003] However, existing VHF band satellite antennas, such as helical and stacked radiating element structures, are inherently bulky due to the longer wavelength of the VHF band. While stacked antennas can reduce size by using high-dielectric-constant dielectric substrates, this also results in excessive antenna weight, making it difficult to meet the requirements of portable satellite communication terminals. Moreover, the large-scale ceramic sintering process significantly impacts the dielectric constant, leading to noticeable antenna frequency deviation and higher costs. Furthermore, the dual-frequency transceiver unit design, confined to a limited space, suffers from severe inter-frequency coupling interference and poor isolation between the dual-frequency ports, easily causing a decrease in antenna gain and affecting satellite communication. Summary of the Invention

[0004] This invention provides a dual-frequency circularly polarized satellite antenna and terminal electronic device to solve the technical problems in the prior art where conventional dual-frequency circularly polarized satellite antennas are difficult to simultaneously achieve miniaturization, lightweight, low cost, integrated transmission and reception, high isolation, and wide beam high gain radiation within a limited space, especially in the VHF band where there are technical problems such as large antenna size, large weight, high cost, significant frequency deviation, and poor dual-frequency port isolation.

[0005] To solve the above problems, the technical solution of the present invention is: a dual-frequency circularly polarized satellite antenna, comprising: The first radiation assembly and the second radiation assembly each consist of two or more sets of radiators; The first and second feeding structure components are connected to the first and second radiating components respectively. The first and second radiating components are fed in a sequentially rotating phase manner based on the feeding network to achieve dual-frequency circular polarization radiation. The first radiating component is configured to resonate in the high-frequency band, and the second radiating component is configured to resonate in the low-frequency band. The first short-circuit structure component and the second short-circuit structure component are respectively connected to the first radiating component and the second radiating component, and are used to short-circuit the first radiating component and the second radiating component to the metal ground; An isolation structure, including a spatial isolation structure and a port isolation structure, is configured to improve the isolation between the first radiating component and the second radiating component.

[0006] In one or more embodiments, when the first radiating component and / or the second radiating component consists of two sets of radiators, the two sets of radiators are arranged at an angle of 85° to 95° and circular polarization is achieved by a feeding method with a phase difference of ±90°.

[0007] In one or more embodiments, when the first radiating component and / or the second radiating component consists of four sets of radiators, adjacent sets of radiators are arranged at an angle of 85° to 95°, and the four sets of radiators are fed by sequentially increasing or decreasing the phase by 90° clockwise to achieve right-hand circular polarization or left-hand circular polarization.

[0008] In one or more embodiments, the radiator is any one of the following: a rectangular regular-shaped planar structure, a bent-shaped planar structure composed of multiple sequentially connected radiator segments with adjacent radiator segments having different extension directions, or a sawtooth-shaped planar structure in which at least a portion of the edges are composed of multiple sequentially connected polygonal radiator segments.

[0009] In one or more embodiments, a dielectric support structure is included for carrying radiating components and / or a power supply network; When there are multiple medium support structures that carry radiation components, their positional relationship can be nested or orthogonally perpendicular.

[0010] In one or more embodiments, the power supply network includes one or more of a coupler, a Wilkinson power divider, and a delay line; The power supply network is configured to split one input signal into two signals of equal amplitude and a phase difference of 90°, or into four signals of equal amplitude and a phase difference of 90° between adjacent signals, so as to sequentially power the corresponding radiator.

[0011] In one or more embodiments, the first feeding structure component and the second feeding structure component are each composed of a number of feeding units corresponding to the radiators of the first radiation component and the second radiation component, and each feeding unit is used to excite a group of radiators. The power supply unit adopts a direct power supply method with metal conductors, or an electromagnetic coupling non-contact power supply method.

[0012] In one or more embodiments, the first short-circuit structure component and the second short-circuit structure component are each composed of a number of short-circuit units corresponding to the radiators of the first radiation component and the second radiation component, and each short-circuit unit is connected to a group of radiators and short-circuited to the metal ground. The short-circuit unit is connected by direct metal conductors.

[0013] In one or more embodiments, the spatial isolation structure is configured to be implemented in at least one of the following ways: Increase the lateral distance between the high-frequency radiation components and the low-frequency radiation components; The high-frequency radiation components and the low-frequency radiation components are arranged in a staggered manner along the longitudinal height direction. A metal baffle or frequency-selective surface is installed between the high-frequency radiation component and the low-frequency radiation component.

[0014] In one or more embodiments, the port isolation structure is disposed in the first radiating component, the second radiating component, and / or the power supply network, and the port isolation structure includes any one or any combination of open-circuit stubs, short-circuit stubs, LC notch structures, slot structures, or EBG structures.

[0015] In one or more embodiments, the opening stub of the port isolation structure includes: Low-frequency open-circuit stubs are installed at high-frequency radiating components and / or high-frequency feed networks to filter out low-frequency signals; And / or, high-frequency open-circuit stubs located at low-frequency radiating components and / or low-frequency feed networks for filtering high-frequency signals.

[0016] In one or more embodiments, several of the dual-frequency circularly polarized satellite antennas can be combined and configured into a multi-element array antenna structure.

[0017] In one or more embodiments, the dual-frequency circularly polarized satellite antenna may be integrally injection molded and / or integrally integrated with the antenna housing.

[0018] Based on the same concept, the present invention also provides a terminal electronic device, including at least one set of dual-frequency circularly polarized satellite antennas as described in any one of the above-mentioned embodiments.

[0019] Because of the above technical solutions, this invention has the following advantages and positive effects compared with the prior art: This invention provides a dual-frequency circularly polarized satellite antenna and terminal electronic equipment, including a radiating component resonating in a high-frequency band and a low-frequency band, a feeding structure component and a feeding network for exciting the radiating component to achieve dual-frequency circularly polarized radiation, a short-circuit structure component for short-circuiting the radiating component, and an isolation structure for reducing signal interference between different radiating components. First, this invention, based on a radiating component, a feeding structure component, and a feeding network, enables the sharing of a single antenna for both transmission and reception bands, meeting the requirements of integrated transceiver applications. Compared to existing discrete or bulky traditional satellite antenna structures, it effectively reduces the overall space occupied and improves terminal integration. Second, the radiators of the radiating component can extend the current path through a tortuous extension structure, achieving target frequency band resonance within a smaller physical size, which is beneficial for antenna miniaturization while maintaining antenna gain performance. Third, this invention uses a sequential rotating phase feeding method to feed multiple radiators to achieve circular polarization radiation, resulting in good antenna circular polarization performance and a more stable communication link, meeting the needs of satellite communication. Fourth, based on port isolation and spatial isolation structures, this invention effectively solves the problem of severe inter-frequency coupling between high-frequency and low-frequency units within a limited space, improving the isolation effect between high and low frequency signals. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of the dual-frequency circularly polarized satellite antenna provided by this invention; Figure 2a A schematic diagram of the high-frequency antenna section provided by this invention; Figure 2b A schematic diagram of the structure of a single radiator in the high-frequency antenna section provided by the present invention; Figure 2c A schematic diagram of the low-frequency antenna section provided by this invention; Figure 2d A schematic diagram of the structure of a single radiator in the low-frequency antenna section provided by the present invention; Figure 3a The present invention provides a schematic diagram of a radiating component employing one of the bent planar structures and a corresponding radiation pattern at the antenna resonant frequency. Figure 3b The present invention provides a schematic diagram of the structure of a radiating component employing a bent planar structure and a corresponding radiation pattern at the antenna resonant frequency. Figure 4 The present invention provides a schematic diagram of a feeding network for exciting a high-frequency radiation component. Figure 5a The reflection coefficient of the high-frequency feeding network provided by this invention; Figure 5b The transmission coefficient of the high-frequency power supply network provided by this invention; Figure 6The port isolation of the high- and low-frequency antennas is improved by adding an isolation structure in this invention. Figure 7 A schematic diagram of a structure in which a first dielectric substrate and a second dielectric substrate are arranged orthogonally and perpendicularly provided by the present invention; Figure 8 The present invention provides a schematic diagram of a structure in which the first dielectric substrate and the second dielectric substrate are arranged in parallel and nested.

[0021] Explanation of reference numerals in the attached drawings: 101: First radiating component; 1011: First radiator; 102: Second radiating component; 1021: Second radiator; 201: First dielectric substrate; 202: Second dielectric substrate; 203: Third dielectric substrate; 301: First power supply structure component; 302: Second power supply structure component; 401: First short-circuit structure component; 402: Second short-circuit structure component; 50: Power supply network; 60: Isolation structure; 70: Metal ground. Detailed Implementation

[0022] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed account of a dual-frequency circularly polarized satellite antenna and terminal electronic device proposed in this invention. The advantages and features of this invention will become clearer from the following description and claims.

[0023] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] First Embodiment See Figure 1Figure 2 shows a dual-frequency circularly polarized satellite antenna provided in this embodiment, including a first radiating component 101 and a second radiating component 102, a first feeding structure component 301 and a second feeding structure component 302, a feeding network 50, a first short-circuit structure component 401 and a second short-circuit structure component 402, and an isolation structure 60, so as to realize the integrated dual-frequency circularly polarized radiation of high-frequency and low-frequency signals in a limited space, while taking into account the functions of antenna miniaturization, high isolation and high gain.

[0026] Specifically, the first radiation component 101 and the second radiation component 102 are each composed of two or more radiators.

[0027] The first feeding structure component 301 is connected to the first radiation component 101, and the second feeding structure component 302 is connected to the second radiation component 102. The first feeding structure component 301 and the second feeding structure component 302 feed the first radiation component 101 and the second radiation component 102 respectively based on the feeding network 50 in a sequential rotating phase manner to realize dual-frequency circular polarization radiation.

[0028] In this embodiment, the first radiating component 101 is configured to resonate in the high-frequency band, and the second radiating component 102 is configured to resonate in the low-frequency band. Of course, the first radiating component 101 can also be configured to resonate in the low-frequency band, and the second radiating component 102 can be configured to resonate in the high-frequency band to satisfy the dual-frequency signal transmission and reception function. This embodiment is not limited to this.

[0029] The first short-circuit structure component 401 is connected to the first radiation component 101, and the second short-circuit structure component 402 is connected to the second radiation component 102. The first short-circuit structure component 401 and the second short-circuit structure component 402 are respectively used to short-circuit the first radiation component 101 and the second radiation component 102 to the metal ground 70. By adjusting the distance between the short-circuit structure component and the power supply structure component, and the width of the short-circuit structure component, the impedance matching can be improved.

[0030] The isolation structure 60 is located in the first radiating component 101, the second radiating component 102 and the power supply network 50. The isolation structure 60 includes a spatial isolation structure and a port isolation structure. The isolation structure 60 is configured to improve the isolation between the first radiating component 101 and the second radiating component 102 and reduce signal interference between high-frequency signals and low-frequency signals.

[0031] The specific structure and functionality of the dual-frequency circularly polarized satellite antenna provided in this embodiment will be described in further detail below: In one or more embodiments, when the first radiating component 101 and / or the second radiating component 102 consists of two sets of radiators, the two sets of radiators are arranged at an angle of 85° to 95° and circular polarization is achieved by a feeding method with a phase difference of ±90°.

[0032] Specifically, the first radiating component 101 consists of two or more sets of identical first radiators 1011, and the second radiating component 102 consists of two or more sets of identical second radiators 1021. The first radiators 1011 are configured to resonate at high frequencies, and the second radiators 1021 are configured to resonate at low frequencies to achieve dual-frequency resonance. When there are two sets of first radiators 1011 or two sets of second radiators 1021, taking the first radiator 1011 as an example, the two sets of first radiators 1011 are placed at an angle of 85° to 95°, and circular polarization is achieved through a feeding method with a phase difference of ±90°. The placement of the second radiators 1021 is similar to the feeding method and will not be repeated.

[0033] In one or more embodiments, when the first radiating component 101 and / or the second radiating component 102 consists of four sets of radiators, the adjacent sets of radiators are arranged at an angle of 85° to 95°, and the four sets of radiators are fed by sequentially increasing or decreasing the phase by 90° clockwise to achieve right-hand circular polarization or left-hand circular polarization.

[0034] Specifically, when there are four sets of first radiators 1011 or four sets of second radiators 1021, taking the first radiator 1011 as an example, adjacent sets of first radiators 1011 are arranged at an angle of 85° to 95°, and circular polarization is achieved by feeding the four sets of first radiators 1011 with a clockwise phase increment of 90° or a decrement of 90°. The arrangement of the second radiators 1021 is similar to the feeding method and will not be repeated.

[0035] In one or more embodiments, the radiator is any one of the following: a rectangular regular-shaped planar structure, a bent-shaped planar structure composed of multiple sequentially connected radiator segments with adjacent radiator segments having different extension directions, or a sawtooth-shaped planar structure in which at least a portion of the edges are composed of multiple sequentially connected polygonal radiator segments.

[0036] Among them, when adopting irregularly shaped bent planar structures or sawtooth planar structures, the target frequency band resonance can be achieved with a smaller physical size by extending the current path, thereby realizing antenna miniaturization; at the same time, in the specific wiring, it is preferable to reduce the design of mutual current cancellation to improve antenna gain.

[0037] like Figure 3a As shown, this embodiment provides a bent-shape planar structure for a radiating component. Figure 3aThe radiating component consists of five segments: a0 (first radiator segment), b0 (second radiator segment), c0 (third radiator segment), d0 (fourth radiator segment), and e0 (fifth radiator segment). The total length, width, and number of radiator segments can be adjusted according to the resonant frequency of the radiator. When the resonant frequency is high, the total length of the radiator decreases, and the length of the radiator segments can be shortened or the number of radiator segments can be reduced as needed (e.g., removing radiator segment e0). When the resonant frequency is low, the total length of the radiator increases, and the length of the radiator segments can be lengthened or the number of radiator segments can be increased as needed.

[0038] like Figure 3b As shown, this embodiment provides a preferred bent-shape planar structure for a radiating component. Figure 3b The radiating component consists of five segments: a1 (first radiator segment), b1 (second radiator segment), c1 (third radiator segment), d1 (fourth radiator segment), and e1 (fifth radiator segment). The total length, width, and number of radiator segments can be adjusted according to the resonant frequency of the radiator. When the resonant frequency is high, the total length of the radiator decreases, and the length of the radiator segments can be shortened or the number of radiator segments can be reduced as needed (e.g., removing radiator segment e1). When the resonant frequency is low, the total length of the radiator increases, and the length of the radiator segments can be lengthened or the number of radiator segments can be increased as needed. Figure 3a In the intermediate radiating element, there are many opposing current segments between the radiating sections, resulting in significant current cancellation and lower gain. Figure 3b In this process, by tilting the third radiator segment c1, the fourth radiator segment d1, and the fifth radiator segment e1, so that the first radiator segment a1 and the third radiator segment c1 are not parallel, and the third radiator segment c1 and the fifth radiator segment e1 are not parallel, current reversal is reduced and gain is improved. As shown in the figure, it can be seen that... Figure 3b The shape of the radiation component shown is larger than Figure 3a The radiating component shown has low current cancellation and high gain.

[0039] In one or more embodiments, the dual-frequency circularly polarized satellite antenna further includes a dielectric support structure for carrying radiating components and / or a feed network; When there are multiple medium support structures that carry radiation components, their positional relationship can be nested or orthogonally perpendicular.

[0040] The dielectric support structure can be a solid dielectric substrate or an air medium. For example, the first radiating component is arranged on the dielectric substrate, and the second radiating component is arranged in the air medium based on a sheet metal structure. Alternatively, both the first and second radiating components can be arranged on the dielectric substrate, or both can be arranged in the air medium. Furthermore, if both the first and second radiating components are arranged on the dielectric substrate, they can be arranged on one dielectric substrate or on two dielectric substrates. This embodiment is not limited to this.

[0041] Meanwhile, the power supply network can be built directly using discrete radio frequency devices (couplers, power dividers, etc.), or it can be a printed circuit power supply network based on a dielectric substrate. This embodiment is not limited to these limitations.

[0042] In one embodiment, the dielectric support structure includes a first dielectric substrate 201, a second dielectric substrate 202, and a third dielectric substrate 203 as an example. The first dielectric substrate 201 is used to support the first radiating component 101, the second dielectric substrate 202 is used to support the second radiating component 102, and the third dielectric substrate 203 is used to support the power supply network 50. The metal ground 70 is located on the side of the third dielectric substrate 203 that is away from the power supply network 50.

[0043] like Figures 7-8 As shown, the first dielectric substrate 201 and the second dielectric substrate 202 are arranged in a nested relationship or an orthogonal perpendicular relationship.

[0044] Specifically, in one embodiment, the first dielectric substrate 201 and the second dielectric substrate 202 are arranged in a parallel nested configuration. A first radiating component 101 is disposed on the first dielectric substrate 201, and a second radiating component 102 is disposed on the second dielectric substrate 202. Taking an example where the first radiating component 101 is composed of four sets of first radiators 1011 with identical structures, and the second radiating component 102 is composed of four sets of second radiators 1021 with identical structures, the first dielectric substrate 201 and the second dielectric substrate 202 form a nested arrangement in a U-shape. Adjacent sets of radiators in the first radiating component 101 and the second radiating component 102 are arranged at an angle of 85° to 95°, and are fed by sequentially increasing or decreasing the phase by 90° clockwise to achieve right-hand circular polarization or left-hand circular polarization.

[0045] Of course, the first radiator 1011 and the second radiator 1021 arranged in the nested arrangement of the first dielectric substrate 201 and the second dielectric substrate 202 can be arranged either parallelly or perpendicularly. This embodiment is not limited to this. Figure 1 As shown, the extension planes of the first radiator 1011 and the second radiator 1021 are arranged perpendicularly, meaning that the planar extension direction of the radiating component is not limited to the extension direction of the dielectric substrate.

[0046] In another embodiment, the first dielectric substrate 201 and the second dielectric substrate 202 are arranged orthogonally and perpendicularly. A first radiating component 101 is disposed on the first dielectric substrate 201, and a second radiating component 102 is disposed on the second dielectric substrate 202. Taking an example where the first radiating component 101 is composed of four sets of first radiators 1011 with identical structures, and the second radiating component 102 is composed of four sets of second radiators 1021 with identical structures, the extending planes of the first dielectric substrate 201 and the second dielectric substrate 202 in the same direction are arranged orthogonally and perpendicularly. Adjacent sets of radiators in the first radiating component 101 and the second radiating component 102 are arranged at an angle of 85° to 95°, and are fed in a clockwise direction with a phase increment of 90° or a phase decrement of 90° to achieve right-hand circular polarization or left-hand circular polarization.

[0047] In this embodiment, the dielectric substrate can be a plastic injection molded part, a PCB board, etc.

[0048] Optionally, the first radiating component 101, the second radiating component 102, the first feeding structure component 301, the second feeding structure component 302, the feeding network 50, the first short-circuit structure component 401, the second short-circuit structure component 402, and the isolation structure 60 can also be formed by integrated injection molding and / or integrated with the antenna housing to improve the structural integration and reduce the overall weight of the antenna.

[0049] In one or more embodiments, the power supply network 50 includes one or more of a coupler, a Wilkinson power divider, and a delay line.

[0050] The power supply network 50 is electrically connected to the first power supply structure component 301 and the second power supply structure component 302, respectively.

[0051] The feeding network 50 is configured to split one input signal into two signals of equal amplitude and a phase difference of 90°, or into four signals of equal amplitude and a phase difference of 90° between adjacent signals, to sequentially feed the corresponding radiator, thereby synthesizing a circularly polarized wave.

[0052] In one or more embodiments, the first feeding structure assembly 301 is composed of a number of feeding units corresponding to the number of radiators of the first radiating assembly 101, and the second feeding structure assembly 302 is composed of a number of feeding units corresponding to the number of radiators of the second radiating assembly 102, with each feeding unit corresponding to a set of radiators.

[0053] The power supply unit adopts a direct power supply method using metal conductors, or an electromagnetic coupling non-contact power supply method.

[0054] Specifically, the first feeding structure assembly 301 consists of two or more feeding units, each of which is used to excite a first radiator 1011. The second feeding structure assembly 302 consists of two or more feeding units, each of which is used to excite a second radiator 1021. Each feeding unit can be a metal conductor directly feeding the radiator, or it can be an electromagnetically coupled non-contact feeding radiator. The position of the feeding unit can be adjusted in conjunction with the frequency to achieve the required impedance matching.

[0055] In one or more embodiments, the first short-circuit structure component 401 is composed of a number of short-circuit units corresponding to the number of radiators of the first radiating component 101, and the second short-circuit structure component 402 is composed of a number of short-circuit units corresponding to the number of radiators of the second radiating component 102. Each short-circuit unit is connected to a set of radiators and short-circuited to the metal ground 70.

[0056] The short-circuit unit uses a direct connection method with metal conductors.

[0057] Specifically, the first short-circuit structure component 401 consists of two or more short-circuit units, each of which is used to connect a first radiator 1011 to the metal ground 70. The second short-circuit structure component 402 consists of two or more short-circuit units, each of which is used to connect a second radiator 1021 to the metal ground 70. Each short-circuit unit can use a metal conductor to directly short-circuit the radiator and the metal ground 70. The position of the short-circuit unit can be adjusted according to the frequency to achieve the required impedance matching.

[0058] In one or more embodiments, the spatial isolation structure is configured to be implemented in at least one of the following ways: Increase the horizontal distance between the high-frequency radiation components and the low-frequency radiation components; The high-frequency radiation components and low-frequency radiation components are arranged at different heights in the vertical direction, that is, the radiators of the high-frequency radiation components and low-frequency radiation components are set at different heights to reduce the overlap of the high-frequency and low-frequency radiators. A metal baffle or frequency-selective surface is installed between the high-frequency radiation component and the low-frequency radiation component.

[0059] In this embodiment, when the first dielectric substrate 201 and the second dielectric substrate 202 are nested, they are arranged with a height difference in the height direction, and the radiators of the high-frequency radiating component and the low-frequency radiating component are staggered when the wiring is bent, so as to reduce the spatial overlap of the corresponding two sets of radiators in the first radiating component 101 and the second radiating component 102, improve spatial isolation, reduce current cancellation, and improve antenna gain.

[0060] In one or more embodiments, a port isolation structure is disposed in the first radiating component 101, the second radiating component 102 and / or the power supply network 50. The port isolation structure includes any one or any combination of open-circuit stubs, short-circuit stubs, LC notch structures, slot structures or EBG structures (Electromagnetic Band Gap Structures).

[0061] The port isolation structure includes the following opening stubs: Low-frequency open-circuit stubs are installed at the high-frequency radiation components and / or high-frequency feed network 50 to filter out low-frequency signals; And / or, high-frequency open-circuit stubs located at the low-frequency radiation component and / or low-frequency feed network 50, for filtering out high-frequency signals.

[0062] In this embodiment, the length of the opening stub of the port isolation structure is approximately 1 / 4 of the waveguide wavelength corresponding to the target filtering frequency.

[0063] like Figure 4 As shown, Figure 4 A schematic diagram of a feed network 50 with one input and four outputs, consisting of couplers and delay lines, is shown. The feed network 50 can be implemented using transmission lines such as microstrip lines or striplines. If the port isolation structure is located at the antenna radiating element, one end is at the antenna radiating element, and the other end is open; if it is located at the feed network 50, one end is at the input port of the feed network 50, and the other end is open. The length of the open stub of the port isolation structure is approximately 1 / 4 of the waveguide wavelength corresponding to the target filtering frequency, presenting a high impedance to the target filtering frequency to achieve notch filtering. To effectively reduce energy coupling between the high- and low-frequency radiating elements, improve isolation, and enhance antenna gain, a low-frequency open-circuit stub (approximately 1 / 4 of the waveguide wavelength corresponding to the low-frequency operating frequency) can be provided at the high-frequency antenna radiating element or the high-frequency feed network 50 to filter out low frequencies, such as... Figure 4 As shown; simultaneously, a high-frequency open-circuit stub (approximately 1 / 4 of the waveguide wavelength corresponding to the high-frequency operating frequency) is installed at 50 points on the low-frequency antenna radiating component or low-frequency feed network to filter out high frequencies, such as... Figure 2d As shown.

[0064] Figure 5a and Figure 5b The changes in reflection coefficient and transmission coefficient after adding an open stub to the high-frequency feed network 50 are shown. Figure 6 The port isolation effect after simultaneously employing a high-frequency side low-frequency open stub and a low-frequency side high-frequency open stub is shown, with an in-band isolation better than 20 dB.

[0065] In one or more embodiments, several dual-frequency circularly polarized satellite antennas can be combined and configured into a multi-element array antenna structure to achieve beam scanning, high-gain radiation, or anti-interference.

[0066] Second Embodiment Based on the same concept, the present invention also provides a terminal electronic device, including at least one set of dual-frequency circularly polarized satellite antennas as described in any one of the first embodiments.

[0067] The terminal electronic device can be a portable satellite communication terminal, a mobile communication terminal, a fixed station device, or other miniaturized electronic device that requires a dual-frequency circularly polarized antenna; this embodiment is not limited to these. By configuring the above-mentioned dual-frequency circularly polarized satellite antenna, a combination of dual-frequency, circular polarization, high isolation, and high integration performance can be achieved within a limited overall space.

[0068] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A dual-band circularly polarized satellite antenna, characterized by, include: The first radiation assembly and the second radiation assembly each consist of two or more sets of radiators; The first and second feeding structure components are connected to the first and second radiating components respectively. The first and second radiating components are fed in a sequentially rotating phase manner based on the feeding network to achieve dual-frequency circular polarization radiation. The first radiating component is configured to resonate in the high-frequency band, and the second radiating component is configured to resonate in the low-frequency band. The first short-circuit structure component and the second short-circuit structure component are respectively connected to the first radiating component and the second radiating component, and are used to short-circuit the first radiating component and the second radiating component to the metal ground; An isolation structure, including a spatial isolation structure and a port isolation structure, is configured to improve the isolation between the first radiating component and the second radiating component.

2. The dual-band circularly polarized satellite antenna of claim 1, wherein, When the first radiating component and / or the second radiating component consists of two sets of radiators, the two sets of radiators are arranged at an angle of 85° to 95° and circular polarization is achieved by a feeding method with a phase difference of ±90°.

3. The dual-band circularly polarized satellite antenna of claim 1, wherein, When the first radiation component and / or the second radiation component consists of four sets of radiators, the adjacent sets of radiators are arranged at an angle of 85° to 95°, and the four sets of radiators are fed by sequentially increasing or decreasing the phase by 90° clockwise to achieve right-hand circular polarization or left-hand circular polarization.

4. The dual-band circularly polarized satellite antenna of claim 1, wherein, The radiator is any one of the following: a rectangular regular-shaped planar structure, a bent-shaped planar structure composed of multiple sequentially connected radiator segments with adjacent radiator segments extending in different directions, or a sawtooth-shaped planar structure in which at least a portion of the edges are composed of multiple sequentially connected polygonal radiator segments.

5. The dual-band circularly polarized satellite antenna of claim 1, wherein, Includes a dielectric support structure for carrying radiating components and / or power supply networks; When there are multiple medium support structures that carry radiation components, their positional relationship can be nested or orthogonally perpendicular.

6. The dual-band circularly polarized satellite antenna of claim 1, wherein, The power supply network includes one or more of the following: couplers, Wilkinson power dividers, and delay lines; The power supply network is configured to split one input signal into two signals of equal amplitude and a phase difference of 90°, or into four signals of equal amplitude and a phase difference of 90° between adjacent signals, so as to sequentially power the corresponding radiator.

7. The dual-band circularly polarized satellite antenna of claim 1, wherein, The first feeding structure component and the second feeding structure component are each composed of a number of feeding units corresponding to the radiators of the first radiation component and the second radiation component, and each feeding unit is used to excite a group of radiators. The power supply unit adopts a direct power supply method with metal conductors, or an electromagnetic coupling non-contact power supply method.

8. The dual-band circularly polarized satellite antenna of claim 1, wherein, The first short-circuit structure component and the second short-circuit structure component are each composed of a number of short-circuit units corresponding to the radiators of the first radiation component and the second radiation component, respectively. Each short-circuit unit is connected to a group of radiators and short-circuited to the metal ground. The short-circuit unit is connected by direct metal conductors.

9. The dual-band circularly polarized satellite antenna of claim 1, wherein, The spatial isolation structure is configured to be implemented in at least one of the following ways: Increase the lateral distance between the high-frequency radiation components and the low-frequency radiation components; The high-frequency radiation components and the low-frequency radiation components are arranged in a staggered manner along the longitudinal height direction. A metal baffle or frequency-selective surface is installed between the high-frequency radiation component and the low-frequency radiation component.

10. The dual-band circularly polarized satellite antenna of claim 1, wherein, The port isolation structure is disposed in the first radiating component, the second radiating component and / or the power supply network, and the port isolation structure includes any one or any combination of open stub, short stub, LC notch structure, slot structure or EBG structure.

11. The dual-band circularly polarized satellite antenna of claim 10, wherein, The opening stub of the port isolation structure includes: Low-frequency open-circuit stubs are installed at high-frequency radiating components and / or high-frequency feed networks to filter out low-frequency signals; And / or, high-frequency open-circuit stubs located at low-frequency radiating components and / or low-frequency feed networks for filtering high-frequency signals.

12. The dual-band circularly polarized satellite antenna of claim 1, wherein, Several of the aforementioned dual-frequency circularly polarized satellite antennas can be combined and configured into a multi-element array antenna structure.

13. The dual-frequency circularly polarized satellite antenna as described in claim 1, characterized in that, The dual-frequency circularly polarized satellite antenna can be integrally injection molded and / or integrally integrated with the antenna housing.

14. A terminal electronic device, characterized in that, Includes at least one set of dual-frequency circularly polarized satellite antennas as described in any one of claims 1-13.

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