Dual helix antenna and terminal device

Abstract

A double-helix antenna and a terminal device are provided. The double-helix antenna includes: a cylindrical substrate; an excitation radiation structure including a plurality of first helical arms extending helically around the axis of the cylindrical substrate on the side surface of the cylindrical substrate, each first helical arm including a first upper radiating structure, a first series inductor-capacitor element and a first lower radiating structure connected in sequence; and a parasitic resonant radiation structure including a plurality of second helical arms extending helically around the axis of the cylindrical substrate on the side surface of the cylindrical substrate, each second helical arm including a second upper radiating structure, a second series inductor-capacitor element and a second lower radiating structure connected in sequence, the plurality of second helical arms and the plurality of first helical arms being alternately arranged in the circumferential direction of the cylindrical substrate.

Description

Technical Field

[0001] This disclosure relates to the field of satellite communications, and specifically to a double-helix antenna and terminal equipment. Background Technology

[0002] As a crucial front-end component of a radio frequency (RF) system, antennas require different characteristics for different application scenarios. In satellite communication applications, antenna systems typically need to operate in different frequency bands.

[0003] However, existing antennas still have the following problems: 1) They are not suitable for high-selectivity and high-power operating scenarios, and it is difficult to achieve high impedance matching; 2) They cannot meet the requirements for transmitting and receiving signals of two satellite communication protocols at the same time. Utility Model Content

[0004] Providing a mechanism to alleviate, reduce or eliminate at least one of the above problems would be beneficial.

[0005] In a first aspect, a double-helix antenna is provided. The double-helix antenna includes: a cylindrical substrate; an excitation radiation structure including a plurality of first helical arms extending helically around the axis of the cylindrical substrate on a side surface of the cylindrical substrate, each first helical arm including a first upper radiation structure, a first series inductor-capacitor element, and a first lower radiation structure connected in sequence; and a parasitic resonant radiation structure including a plurality of second helical arms extending helically around the axis of the cylindrical substrate on a side surface of the cylindrical substrate, each second helical arm including a second upper radiation structure, a second series inductor-capacitor element, and a second lower radiation structure connected in sequence, the plurality of second helical arms and the plurality of first helical arms being alternately arranged in the circumferential direction of the cylindrical substrate.

[0006] In a second aspect, a terminal device is provided. The terminal device includes: a dual-helix antenna as described above.

[0007] It should be understood that the utility model description section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0008] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of some embodiments thereof in the accompanying drawings, in which:

[0009] Figure 1 A schematic diagram of an exemplary double-helix antenna that can implement embodiments of the present disclosure is shown;

[0010] Figure 2 It shows Figure 1An enlarged schematic diagram of region 200 in the illustrated embodiment;

[0011] Figure 3 An equivalent circuit diagram of an excitation radiation structure according to an embodiment of the present disclosure is shown;

[0012] Figure 4 A schematic diagram of the current when the first spiral arm receives a low-frequency signal according to an embodiment of the present disclosure is shown.

[0013] Figure 5 A schematic diagram of the current when the first spiral arm receives a high-frequency signal according to an embodiment of the present disclosure is shown;

[0014] Figure 6 A structural block diagram of a double-helix antenna according to another embodiment of this disclosure is shown;

[0015] Figure 7a A schematic diagram of the mode reflection coefficient of a double-helix antenna according to an embodiment of the present disclosure is shown;

[0016] Figure 7b A schematic diagram of the antenna axis ratio of a double-helix antenna according to an embodiment of the present disclosure is shown;

[0017] Figure 7c A schematic diagram of the gain direction of a double-helix antenna according to an embodiment of the present disclosure at 1521 MHz is shown;

[0018] Figure 7d A schematic diagram of the gain direction of a double-helix antenna according to an embodiment of the present disclosure at 1671 MHz is shown;

[0019] Figure 7e A schematic diagram of the gain direction of a double-helix antenna according to an embodiment of the present disclosure at 1997.5 MHz is shown;

[0020] Figure 7f A schematic diagram of the gain direction of a double-helix antenna according to an embodiment of the present disclosure at 2182.5 MHz is shown;

[0021] Figure 7g This is a schematic diagram of the radiation efficiency of a double-helix antenna according to an embodiment of the present disclosure. Detailed Implementation

[0022] The principles of this disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and implementing this disclosure, and do not impose any limitation on the scope of this disclosure. The disclosure described herein may be implemented in ways other than those described below.

[0023] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0024] References to "an embodiment," "embodiment," "exemplary embodiment," etc., in this disclosure indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment needs to include specific features, structures, or characteristics. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an exemplary embodiment, whether explicitly described or not, those skilled in the art will recognize that such a feature, structure, or characteristic affects its connection to other embodiments.

[0025] It should be understood that while the terms “first” and “second”, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the exemplary embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term “and / or” as used herein includes any and all combinations of one or more of the listed terms.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. The singular forms “a,” “an,” and “the” used herein also include the plural forms unless the context clearly indicates otherwise. The terms “a group of elements” or “a collection of elements” as used herein are intended to include one or more elements. It should also be understood that the terms “comprising,” “including,” “having,” “possessing,” “including,” and / or “comprising,” when used herein, specify the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0027] As used in this application, the term "circuit" may refer to one or more of the following:

[0028] (a) Implemented only in hardware circuitry (e.g., implemented only in analog and / or digital circuitry)

[0029] (b) A combination of hardware circuitry and software, such as (if applicable):

[0030] (i) a combination of analog and / or digital hardware circuitry with software / firmware; and

[0031] (ii) Any part of a hardware processor (including a digital signal processor), software, and memory that work together to enable a device such as a mobile phone or server to perform various functions, and

[0032] (c) Hardware circuitry and / or processors, such as microprocessors or a portion thereof, which require software (e.g., firmware) to operate, but may be absent when the software is not required to operate.

[0033] The definition of "circuit" applies to all uses of the term in this application, including in any claim. As another example, as used herein, the term "circuit" also includes implementations of hardware circuitry or processors (or processors in general) or a portion thereof and their accompanying software and / or firmware. The term "circuit" also includes, for example, baseband integrated circuits or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing network devices, if applicable to a particular claim element.

[0034] The term "terminal device" refers to any terminal device capable of wireless communication. As an example and not a limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS), or access terminal (AT). This terminal device may include, but is not limited to, mobile phones, cellular phones, smartphones, Voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback devices, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop installed devices (LMEs), USB dongles, smart devices, wireless subscriber equipment (CPEs), Internet of Things (IoT) devices, watches or other wearable devices, head-mounted displays (HMDs), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in the context of industrial and / or automated processing chains), consumer electronics devices, relay nodes, devices operating on commercial and / or industrial wireless networks, etc. The mobile terminal (MT) portion of an IAB node can perform the functions of a "terminal device" and therefore can operate as a terminal device. In the following description, the terms "terminal device," "communication device," "terminal," "user equipment," and "UE" are used interchangeably.

[0035] While the functions described herein may be implemented in fixed and / or wireless network nodes in various exemplary embodiments, in other exemplary embodiments, they may be implemented in user equipment devices (such as cellular phones, tablet computers, laptop computers, desktop computers, mobile IoT devices, or fixed IoT devices). For example, the user equipment device may suitably have the corresponding capabilities described in relation to fixed and / or wireless network nodes. The user equipment device may be user equipment and / or control devices, such as chipsets or processors, configured to control the user equipment when it is installed therein. Examples of these functions include boot server functions and / or home subscriber servers, which may be implemented in the user equipment device by providing the user equipment device with software configured to cause the user equipment device to perform from the perspective of these functions / nodes.

[0036] In satellite communication applications, antenna systems typically need to operate in different frequency bands. Existing antennas achieve this by loading parallel inductors and capacitors into two sets of four-armed helical radiating structures, allowing one set of structures to cover a transmission frequency band and the other to cover a reception frequency band. However, on the one hand, the wide bandwidth of the parallel inductors and capacitors makes these four-armed helical antennas unsuitable for high-frequency, high-selectivity scenarios. On the other hand, the parallel capacitors and inductors are in a high-impedance open-circuit state at resonance, making it difficult to achieve high impedance matching in such four-armed helical antennas. Furthermore, the antenna generates high power when transmitting satellite communication signals, and existing four-armed helical antennas with parallel inductors and capacitors struggle to handle the large currents. However, when the reception and transmission frequency bands of two different satellite communication protocols are different, the antenna needs to have high selectivity for both frequency bands and be able to resonate with both bands to achieve impedance matching, enabling its use in high-power scenarios. Therefore, this type of quad-arm spiral antenna with parallel inductor and capacitor elements cannot or is difficult to meet the requirement of simultaneously covering the transmission and reception of signals from two satellite communication protocols.

[0037] This disclosure proposes a double-helix antenna to achieve dual-satellite communication protocol signal transmission and reception while improving selectivity, making impedance matching easier, and making it more suitable for high-power operating scenarios. By incorporating a first series inductor-capacitor element in the excitation radiation structure and a second series inductor-capacitor element in the parasitic resonant radiation structure, the double-helix antenna achieves improved selectivity, easier impedance matching, and greater suitability for high-power operating scenarios. By sequentially connecting a first upper radiation structure, a first series inductor-capacitor element, and a first lower radiation structure in the excitation radiation structure, the excitation radiation structure can generate a first dual-band resonance to receive two signals of different frequency bands. By sequentially connecting a second upper radiation structure, a second series inductor-capacitor element, and a second lower radiation structure in the parasitic resonant radiation structure, the parasitic resonant radiation structure can generate a second dual-band resonance to transmit two signals of different frequency bands. By setting the arm length of the first upper radiation structure to be shorter than the arm length of the first lower radiation structure, the excitation radiation structure can receive both the first and second signals. By setting the arm length of the second upper radiation structure to be shorter than the arm length of the second lower radiation structure, the parasitic resonant radiation structure can emit the third and fourth signals.

[0038] The following will refer to Figure 1 The principles and implementation of this disclosure are described in detail.

[0039] Figure 1 A schematic diagram of the structure of an exemplary double-helix antenna 100 that can implement embodiments of the present disclosure is shown. Figure 2 It shows Figure 1 An enlarged schematic diagram of region 200 in the illustrated embodiment. (See diagram below.) Figure 1 and Figure 2 As shown, the double-helix antenna 100 includes a cylindrical substrate 110; an excitation radiation structure including a plurality of first helical arms 121 extending in a helical shape around the axis 112 of the cylindrical substrate 110 on the side surface 111 of the cylindrical substrate 110, each first helical arm 121 including a first upper radiation structure 1211, a first series inductor-capacitor element 210 and a first lower radiation structure 1212 connected in sequence; and a parasitic resonant radiation structure including a plurality of second helical arms 131 extending in a helical shape around the axis 112 of the cylindrical substrate 110 on the side surface 111 of the cylindrical substrate 110, each second helical arm 131 including a second upper radiation structure 1311, a second series inductor-capacitor element 220 and a second lower radiation structure 1312 connected in sequence, the plurality of second helical arms 131 and the plurality of first helical arms 121 being alternately arranged in the circumferential direction F1 of the cylindrical substrate 110.

[0040] By incorporating the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220, the selectivity of the double-helix antenna 100 is improved, making it easier to impedance match and more suitable for high-power operating scenarios. By sequentially connecting the first upper radiating structure 1211, the first series inductor-capacitor element 210, and the first lower radiating structure 1212 in the excitation radiating structure, the excitation radiating structure can be used to generate dual-band resonance to receive two different frequency bands of signals. Similarly, by sequentially connecting the second upper radiating structure 1311, the second series inductor-capacitor element 220, and the second lower radiating structure 1312 in the parasitic resonant radiating structure, the parasitic resonant radiating structure can be used to generate dual-band resonance to transmit two different frequency bands of signals.

[0041] like Figure 1 As shown, in some embodiments, the axis 112 of the cylindrical substrate 110 is the central axis of the cylindrical substrate 110.

[0042] Figure 1 and Figure 2 As shown, in some embodiments, each of the plurality of first spiral arms 121 extends from the bottom 113 to the top 114 of the cylindrical substrate 110 in the axial direction F2 of the cylindrical substrate 110 and extends one circle in the circumferential direction F1 of the cylindrical substrate 110, and each of the plurality of second spiral arms 131 extends from the bottom 113 to the top 114 of the cylindrical substrate 110 in the axial direction F2 of the cylindrical substrate 110 and extends one circle in the circumferential direction F1 of the cylindrical substrate 110.

[0043] By arranging the first helical arm 121 and the second helical arm 131 on the axial direction F2 of the cylindrical substrate 110 and extending them around the circumference F1 of the cylindrical substrate 110, the helical arm structure on the axial direction F2 generates vertical polarization, and the helical arm structure on the circumference F1 generates horizontal polarization. The two structures are orthogonally superimposed, achieving multi-band circular polarization. The dual-helix antenna 100 can simultaneously support multiple frequency band signals and improve signal stability.

[0044] It should be understood that the aforementioned "axial direction F2" refers to the direction in which axis 112 is located. The aforementioned "top 114 of the cylindrical substrate 110" includes the area near the top 114 of the cylindrical substrate 110, and the aforementioned "bottom 113 of the cylindrical substrate 110" includes the area near the bottom 113 of the cylindrical substrate 110. For example, as... Figure 2 As shown, in some embodiments, the upper radial structure 1311 of a portion of the second helical arm 131 does not extend to the top 114 of the cylindrical substrate 110. Furthermore, as... Figure 2 As shown, in some embodiments, Figure 2 The circumferential direction F1 is counterclockwise. In some embodiments, the circumferential direction also includes a clockwise direction. In some embodiments, the total number of the first helical arm 121 and the second helical arm 131 is 4.

[0045] like Figure 1 and Figure 2 As shown, the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220 are both indicated by horizontal lines. In some embodiments, the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220 each include an inductor and a capacitor, and the inductor and the capacitor are connected in series.

[0046] Figure 3 A schematic diagram of the equivalent circuit of an excitation radiation structure according to an embodiment of this disclosure is shown. Figure 3 As shown, the equivalent circuit diagram of the excitation radiation structure includes the equivalent resistances of the four first spiral arms 121, namely equivalent resistance R1, equivalent resistance R2, equivalent resistance R3, and equivalent resistance R4. Figure 3 As shown, the equivalent circuit of the excitation radiation structure also includes the transmission line resistor R5. (As...) Figure 3 As shown, the equivalent circuit of each first spiral arm 121 includes an inductor and a capacitor, and the inductor and the capacitor are connected in series. Taking one of the first spiral arms 121 as an example, the first spiral arm 121 includes an inductor L1 and a capacitor C1, and the inductor L1 and the capacitor C1 are connected in series.

[0047] In some embodiments, the inductor and the first upper radiating structure 1211 (or the second upper radiating structure 1311) can be directly connected, or the capacitor and the first upper radiating structure 1211 (or the second upper radiating structure 1311) can be directly connected. The embodiments disclosed herein do not impose specific limitations on this.

[0048] In some embodiments, the excitation radiation structure is configured to generate a first dual-band resonance to receive a first signal under a first satellite communication system and / or a second signal under a second satellite communication system, wherein the frequency bands of the first signal and the second signal are different, and the parasitic resonance radiation structure is configured to generate a second dual-band resonance to transmit a third signal under the first satellite communication system and / or a fourth signal under the second satellite communication system, wherein the frequency bands of the third signal and the fourth signal are different.

[0049] By setting the first series inductor-capacitor element 210, the excitation radiation structure can generate a first dual-band resonance, thereby enabling the double-helix antenna 100 to be configured to simultaneously receive a first signal and a second signal with different frequency bands, or to receive one of the first and second signals alone. By setting the second series inductor-capacitor element 220, the excitation radiation structure can generate a second dual-band resonance, thereby enabling the double-helix antenna 100 to be configured to simultaneously receive a third signal and a fourth signal with different frequency bands, or to receive one of the third and fourth signals alone. Thus, the double-helix antenna 100 can simultaneously support the reception or transmission of two satellite communication protocols.

[0050] Compared to the parallel inductor-capacitor components used in the prior art, the series inductor-capacitor components employed in the embodiments of this disclosure have lower impedance at the resonant frequency, and the impedance change curve of the series inductor-capacitor components with frequency is very steep. This results in a narrower bandwidth and higher selectivity during filtering, enabling more precise filtering out or retention of signals at specific frequencies, thereby achieving first dual-band resonance and second dual-band resonance. The series inductor-capacitor components also make it easier for the antenna to achieve a higher quality factor, thereby improving the performance of the filter and making it perform better in high-frequency applications. At resonance, the low impedance of the series inductor-capacitor components makes it easier for the antenna to handle larger currents, thus enabling the antenna to cope with high-power scenarios during satellite communication signal transmission.

[0051] The first dual-band resonance and the second dual-band resonance in the above embodiments will be further explained in conjunction with the following examples.

[0052] like Figure 1As shown, in some embodiments, the first upper radiating structure 1211 has a first arm length, the first lower radiating structure 1212 has a second arm length, and the second arm length is greater than the first arm length; and the second upper radiating structure 1311 has a third arm length, the second lower radiating structure 1312 has a fourth arm length, and the fourth arm length is greater than the third arm length. In the above embodiments, by setting the second arm length, the first lower radiating structure 1212 can be used to receive high-frequency signals; by setting the first and second arm lengths, the first upper radiating structure 1211 and the first lower radiating structure 1212 can be used together to receive low-frequency signals; by setting the third arm length, the second lower radiating structure 1312 can be used to transmit high-frequency signals; by setting the third and fourth arm lengths, the second upper radiating structure 1311 and the second lower radiating structure 1312 can be used together to transmit low-frequency signals. It should be understood that, taking the first signal and the second signal as examples, since they belong to different frequency bands, they will have a difference between high frequency and low frequency. Therefore, the high frequency signal mentioned above refers to the signal with the higher frequency among the first signal and the second signal, and the low frequency signal refers to the signal with the lower frequency among the first signal and the second signal.

[0053] In some embodiments, the "arm length" in the above embodiments refers to the length measured along the extension direction of the radiating structure. For example, the first arm length of the first upper radiating structure 1211 is the length of the first upper radiating structure 1211 along its extension direction.

[0054] In the above embodiments, taking the first upper radiating structure 1211 and the first lower radiating structure 1212 as examples, the length of the arm of the first lower radiating structure 1212 is set to receive high-frequency signals of different frequency bands. Generally, the shorter the arm length of the first lower radiating structure 1212, the higher the frequency of the signal that can be received. The overall arm length of the first spiral arm 121 (the sum of the first arm length and the second arm length) is set to receive low-frequency signals of different frequency bands. Generally, the longer the overall arm length of the first spiral arm 121, the lower the frequency signal that the double helix antenna 100 can receive (or transmit). In the above embodiments, the second arm length is set to be greater than the first arm length so that the overall arm length of the first spiral arm 121 can be adapted to the signal frequency band to which the low-frequency signal (first signal) that the double helix antenna 100 can receive belongs. Similarly, the fourth arm length is set to be greater than the third arm length so that the overall arm length of the second spiral arm 122 (the sum of the third arm length and the fourth arm length) can be adapted to the signal frequency band to which the low-frequency signal (third signal) that the double helix antenna 100 can transmit belongs.

[0055] Those skilled in the art can set the specific length of the arm of the radiating structure based on practical experience and the actual needs of receiving or transmitting signals, so as to receive or transmit high-frequency signals or low-frequency signals of different frequency bands.

[0056] Figure 4 This diagram illustrates the current flow of the first spiral arm 121 when receiving a high-frequency signal, according to an embodiment of this disclosure. Figure 5 A schematic diagram of the current when the first spiral arm 121 of an embodiment of the present disclosure receives a low-frequency signal is shown.

[0057] like Figure 4 As shown, when receiving a high-frequency signal, the high-frequency signal current forms a first current loop 4 in the first lower radiating structure 1212. The formation of the first current loop 4 indicates that the resonant length of the radiator of the double-helix antenna 100 is longer than the standard size required for resonance (half a wavelength or a quarter wavelength of the received signal). That is, when the double-helix antenna 100 receives a high-frequency signal, the first lower radiating structure 1212 can achieve resonance. This high-frequency signal is within the resonant frequency range of the first lower radiating structure 1212, thereby enhancing the frequency selectivity of the double-helix antenna 100 when receiving high-frequency signals and achieving impedance matching.

[0058] like Figure 5 As shown, when receiving low-frequency signals, due to the presence of the first series inductor-capacitor element 210, a second current loop 5 is formed between the first upper radiating structure 1211 and the first lower radiating structure 1212. The formation of the second current loop 5 indicates that when the double-helix antenna 100 receives low-frequency signals, the first upper radiating structure 1211, the first series inductor-capacitor element 210, and the first lower radiating structure 1212 can resonate. This low-frequency signal falls within the resonant frequency range of the first helical arm 121, thereby enhancing the frequency selectivity of the double-helix antenna 100 when receiving low-frequency signals and achieving impedance matching.

[0059] In the above embodiments, by setting the first arm length and the second arm length, the excitation radiation structure can receive both high-frequency and low-frequency signals. By setting the first series inductor-capacitor element 210, the double-helix antenna 100 can resonate when receiving signals in either the low-frequency or high-frequency band, i.e., it can generate dual-band resonance, allowing both low-frequency and high-frequency signals to selectively pass through. Therefore, the double-helix antenna 100 can receive first and second signals in different frequency bands. Similarly, by setting the third and fourth arm lengths, the parasitic resonant radiation structure can transmit both high-frequency and low-frequency signals. By setting the second series inductor-capacitor element 220, the double-helix antenna 100 can also achieve dual-band resonance when transmitting signals in either the low-frequency or high-frequency band, thus enabling the double-helix antenna 100 to transmit third and fourth signals in different frequency bands.

[0060] In some embodiments, the resonant frequency of the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220, i.e., the center frequency and bandwidth of the signal that is allowed to pass, can be set by setting the inductance and capacitance values ​​of the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220.

[0061] In some embodiments, the resonant frequency of the first series inductor-capacitor element 210 or the second series inductor-capacitor element 220 is calculated using the following formula (1):

[0062]

[0063] Where f is the resonant frequency, L is the inductance value, and C is the capacitance value.

[0064] In some embodiments, the resonant frequency of the radiating arm is calculated using the following formula (2):

[0065] c=λf1 (2)

[0066] Where c is the speed of light, f1 is the resonant frequency of the radiating arm, the radiating arm includes a first spiral arm 121 and a second spiral arm 131, and λ is half a wavelength or a quarter wavelength of the received or transmitted signal.

[0067] In some embodiments, the values ​​of f and f1 are close to achieve overall resonance of the double helix antenna 100 and impedance matching of the double helix antenna 100.

[0068] In some embodiments, the frequency band of the first signal is the receiving frequency band of a low-Earth orbit satellite, the frequency band of the second signal is the receiving frequency band of a Tiantong satellite, the frequency band of the third signal is the transmitting frequency band of a low-Earth orbit satellite, and the frequency band of the fourth signal is the transmitting frequency band of a Tiantong satellite. In some embodiments, the center frequency of the first signal frequency band is 1521MHz, the center frequency of the second signal frequency band is 1997.5MHz, the center frequency of the third signal frequency band is 1671MHz, and the center frequency of the fourth signal frequency band is 2182.5MHz.

[0069] In some embodiments, the first series inductor-capacitor element 210 and the second series inductor-capacitor element 220 respectively include an inductance of 0.1 μH and a capacitance of 0.1 pF. During operation, the center frequency of the first lower segment radiation structure 1212 of the excitation radiation structure is 1997.5 MHz, and the resonant frequency of the first series inductor-capacitor element 210 is 1591.5 MHz. The first series inductor-capacitor element 210 acts as a bandpass filter, causing the first upper segment radiation structure 1211 and the first lower segment radiation structure 1212 of the excitation radiation structure to work together, with a resonant frequency of 1521 MHz, thereby covering the receiving frequency band (1997.5 MHz) of the Tiantong satellite and the receiving frequency band (1521 MHz) of low-Earth orbit satellite communication; parasitic The center frequency of the second lower segment radiation structure 1312 of the resonant radiation structure is 2182.5MHz, and the center frequency of the resonant frequency range of the second series inductor-capacitor element 220 is 1591.5MHz. The second series inductor-capacitor element 220 is equivalent to a bandpass filter, so that the second upper segment radiation structure 1311 and the second lower segment radiation structure 1312 of the parasitic resonant radiation structure work together to achieve a resonant frequency of 1671MHz, thereby covering the transmission frequency band (2182.5MHz) of the Tiantong satellite and the transmission frequency band (1671MHz) of the low-Earth orbit satellite.

[0070] In some embodiments, the cylindrical substrate 110 is made of polyimide. In some embodiments, the polyimide substrate has a dielectric constant of 2.65 and a loss angle of 0.008, exhibiting low loss and chemical stability. In some embodiments, the cylindrical substrate 110 may also be made of other materials with low loss and chemical stability. In some embodiments, the polyimide thickness is 0.1 mm. In some embodiments, the polyimide thickness can be set according to actual engineering requirements.

[0071] In some embodiments, when fabricating the double-helix antenna 100, the excitation radiation structure and the parasitic resonant radiation structure are first printed on a substrate of polyimide material, and then the substrate is processed into a cylindrical shape to obtain a cylindrical substrate 110.

[0072] In some embodiments, the materials of the excitation radiation structure and the parasitic resonant radiation structure include metallic copper. In some embodiments, the materials of the excitation radiation structure and the parasitic resonant radiation structure also include other metals with good electrical conductivity, such as gold and silver.

[0073] In some embodiments, the height of the double-helix antenna 100 is set to 0.64λ0, and the diameter of the cylindrical substrate 110 is set to 0.06λ0, where λ0 is the wavelength of the double-helix antenna when it operates at its lowest frequency. (Reference) Figure 1The height of the double-helix antenna 100 is measured along the axial direction F2 shown in the figure. The height of the double-helix antenna 100 includes the height of the cylindrical substrate 110 and the thickness of the feed plate. With this dimensional configuration, the double-helix antenna 100 is elongated, meaning the cylindrical substrate is made elongated, which helps to widen the half-power beamwidth, improve coverage, and enhance anti-interference capabilities. In some embodiments, the wavelength at which the double-helix antenna operates at its lowest frequency refers to the lowest frequency signal among the first, second, third, and fourth signals.

[0074] Figure 6 A structural block diagram of a double-helix antenna 100 according to another embodiment of this disclosure is shown. Figure 1 and 6 As shown, in some embodiments, the dual-helix antenna 100 further includes: a feed board 140 disposed at the bottom of the cylindrical substrate 110 and electrically connected to the excitation radiation structure; a feed network 62 disposed on the feed board 140; and a port 61 electrically connected to the feed network 62 for the feed network 62 to interact with the radio frequency front-end circuit (not shown in the figure).

[0075] In some embodiments, both the excitation radiation structure and the parasitic resonant radiation structure are disposed above the feed board 140. The first helical arm 121 of the excitation radiation structure is connected to the feed board 140 and to the feed network on the feed board 140, enabling the double-helix antenna 100 to transmit or receive signals. By integrating the feed network into the feed board, external wiring is avoided, reducing space occupation and making it suitable for miniaturized terminals (such as portable satellite communication devices). By providing port 61, the signal received by the excitation radiation structure can be transmitted to the radio frequency front-end circuit for signal processing (such as filtering and amplification), or the signal processed by the radio frequency front-end circuit can be transmitted to the parasitic resonant radiation structure for signal transmission.

[0076] like Figure 6 As shown, in some embodiments, the double helix antenna 100 further includes a base plate 63 disposed at the bottom of the cylindrical substrate 110. The upper surface of the base plate 63 includes a metal reflective surface to reflect the signal required by the double helix antenna 100, reduce energy loss, and improve gain.

[0077] In some embodiments, the feed plate 140 has a dielectric constant of 3.66, a loss angle of 0.004, and a thickness of 0.762 mm. In some embodiments, the thickness of the feed plate 140 can be set according to actual engineering requirements.

[0078] Figures 7a-7g This is a schematic diagram illustrating the simulation test results of a double-helix antenna according to an embodiment of this disclosure. Wherein, Figure 7aThis is a schematic diagram of the mode reflection coefficient of a double-helix antenna according to an embodiment of this disclosure, where the horizontal axis represents the frequency Freq (unit: GHz) of the signal received or transmitted by the double-helix antenna, and the vertical axis represents the reflection coefficient of the double-helix antenna (unit: dB). Figure 7a As shown, the mode reflection coefficient of the double-helix antenna 100 is less than -8dB at 1521MHz (point m2 in the figure), 1671MHz (point m4 in the figure), 1997.5MHz (point m3 in the figure), and 2182.5MHz (point m1 in the figure). That is, in the signal frequency bands corresponding to low-Earth orbit satellites and Tiantong satellites, the double-helix antenna 100 has a low reflection coefficient, enabling good impedance matching and efficient signal transmission.

[0079] Figure 7b This is a schematic diagram of the axial ratio of a double-helix antenna according to an embodiment of this disclosure, where the horizontal axis represents the frequency Freq (unit: GHz) of the signal received or transmitted by the double-helix antenna, and the vertical axis represents the axial ratio of the double-helix antenna (unit: dB). Figure 7b As shown, at 1521MHz, 1671MHz, 1997.5MHz and 2182.5MHz, the axial ratio of the double-helix antenna is almost close to 0, and the circular polarization performance of the double-helix antenna is good. Therefore, the polarization matching degree, anti-interference ability and link stability of the communication system of the double-helix antenna are also strong.

[0080] Figure 7c This is a schematic diagram of the gain direction of a double-helix antenna according to an embodiment of this disclosure at 1521MHz. Figure 7d This is a schematic diagram of the gain direction of a double-helix antenna according to an embodiment of this disclosure at 1671MHz. Figure 7e This is a schematic diagram of the gain direction of a double-helix antenna according to an embodiment of this disclosure at 1997.5 MHz. Figure 7f This is a schematic diagram of the gain direction of a double-helix antenna according to an embodiment of this disclosure at 2182.5 MHz. Figures 7c-7f The vertical axis represents gain (in dBi), and the horizontal axis represents angle (in degrees). Figures 7c-7f In each figure, the four curves represent the gain values ​​in four directions: LHCP-0 is the gain value for transmitting (or receiving) a left-hand circularly polarized wave at 0 degrees azimuth. LHCP-90 is the gain value for transmitting (or receiving) a left-hand circularly polarized wave at 90 degrees azimuth. RHCP-0 is the gain value for transmitting (or receiving) a left-hand circularly polarized wave at 0 degrees azimuth. RHCP-90 is the gain value for transmitting (or receiving) a left-hand circularly polarized wave at 90 degrees azimuth.

[0081] like Figure 7cAs shown, when operating at 1521MHz, the antenna's 0-dBi beamwidth L1 (i.e., the angular width between two points with a gain of 0dBi) can reach ±141°. Figure 7d As shown, when operating at 1671MHz, the antenna's 0-dBi beamwidth L2 can reach ±151°. Figure 7e As shown, when operating at 1997.5MHz, the antenna's 0-dBi beamwidth L3 can reach ±169°. Figure 7f As shown, when operating at 2182.5MHz, the antenna's 0-dBi beamwidth L4 can reach ±173°. Within the aforementioned operating frequency band, the dual-helix antenna can maintain a large coverage area with isotropic radiation levels.

[0082] Figure 7g This is a schematic diagram of the radiation efficiency of a double-helix antenna according to an embodiment of this disclosure, where the horizontal axis represents the frequency (unit: GHz) of the signal received or transmitted by the double-helix antenna, and the vertical axis represents the radiation efficiency. Figure 7g As shown, the radiation efficiency of the double-helix antenna is 83.81% at 1521MHz, 84.36% at 1671MHz, 99.75% at 1997.5MHz, and 92.65% at 2182.5MHz. Within the aforementioned operating frequency bands, the double-helix antenna exhibits relatively high radiation efficiency.

[0083] The embodiments of this disclosure also propose a terminal device, including the aforementioned double-helix antenna. Because it includes the double-helix antenna described in the above embodiments, the terminal device of this disclosure is more suitable for high-power operating scenarios while ensuring the transmission and reception of dual-satellite communication protocol signals.

[0084] Furthermore, although the operations are described in a specific order, this should not be construed as requiring that these operations be performed in the specific order or sequence shown, or that all of the operations shown be performed to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the foregoing discussion, these details should not be construed as limiting the scope of this disclosure, but rather as descriptions of features specific to particular embodiments. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0085] Although this disclosure has been described in language specific to structural features and / or methodological behavior, it should be understood that this disclosure as defined in the appended claims is not necessarily limited to the specific features or behaviors described above. Rather, the specific features and actions described above are disclosed as exemplary forms for implementing the claims.

[0086] It should be fully understood that the use of personally identifiable information should comply with privacy policies and practices generally considered to meet or exceed industry or governmental requirements for protecting user privacy. In particular, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to the user.

Claims

1. A double-helix antenna, characterized in that, include: Cylindrical substrate; An excitation radiation structure includes a plurality of first spiral arms extending spirally around the axis of the cylindrical substrate on the side surface of the cylindrical substrate, each first spiral arm including a first upper radiation structure, a first series inductor-capacitor element and a first lower radiation structure connected in sequence. as well as The parasitic resonant radiation structure includes a plurality of second spiral arms extending spirally around the axis of the cylindrical substrate on the side surface of the cylindrical substrate. Each second spiral arm includes a second upper radiation structure, a second series inductor-capacitor element, and a second lower radiation structure connected in sequence. The plurality of second spiral arms and the plurality of first spiral arms are arranged alternately in the circumferential direction of the cylindrical substrate.

2. The double-helix antenna as described in claim 1, characterized in that, The excitation radiation structure is configured to generate a first dual-band resonance to receive a first signal under a first satellite communication system and / or a second signal under a second satellite communication system, wherein the frequency bands of the first signal and the second signal are different; and the parasitic resonance radiation structure is configured to generate a second dual-band resonance to transmit a third signal under the first satellite communication system and / or a fourth signal under the second satellite communication system, wherein the frequency bands of the third signal and the fourth signal are different.

3. The double-helix antenna as described in claim 2, characterized in that, The first signal is received in the low-Earth orbit satellite frequency band, the second signal is received in the Tiantong satellite frequency band, the third signal is transmitted in the low-Earth orbit satellite frequency band, and the fourth signal is transmitted in the Tiantong satellite frequency band.

4. The double-helix antenna as described in any one of claims 1-3, characterized in that, The first upper radiating structure has a first arm length, and the first lower radiating structure has a second arm length, the second arm length being greater than the first arm length; as well as The second upper radiating structure has a third arm length, and the second lower radiating structure has a fourth arm length, wherein the fourth arm length is greater than the third arm length.

5. The double-helix antenna as described in any one of claims 1-3, characterized in that, Each of the plurality of first spiral arms extends from the bottom to the top of the cylindrical substrate in the axial direction of the cylindrical substrate and extends one circle in the circumferential direction of the cylindrical substrate, and each of the plurality of second spiral arms extends from the bottom to the top of the cylindrical substrate in the axial direction of the cylindrical substrate and extends one circle in the circumferential direction of the cylindrical substrate.

6. The double-helix antenna as described in claim 5, characterized in that, The height of the double-helix antenna is set to 0.64λ0, and the diameter of the cylindrical substrate is set to 0.06λ0, where λ0 is the wavelength of the double-helix antenna when it operates at its lowest frequency.

7. The double-helix antenna as described in any one of claims 1-3, characterized in that, Also includes: A feed plate is disposed at the bottom of the cylindrical substrate and is electrically connected to the excitation radiation structure; A power supply network is installed on the power supply board; as well as The port is electrically connected to the power supply network to allow the power supply network to interact with the radio frequency front-end circuitry.

8. A terminal device, characterized in that, include: The double-helix antenna as described in any one of claims 1-7.

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