Dual circularly polarized independent scanning reconfigurable reflectarray antenna

Abstract

The application provides a double circular polarization independent scanning reconfigurable reflectarray antenna, and relates to the technical field of antenna engineering, and comprises a feed horn antenna and a reconfigurable double circular polarization reflectarray surface, wherein the reconfigurable double circular polarization reflectarray surface comprises periodically arranged reconfigurable reflecting units; each reconfigurable unit can generate independent phase responses for left-handed and right-handed circular polarization incident waves. Through the control of the spatial distribution of the state of the reconfigurable unit at the array level, double circular polarization independent beam scanning can be realized. The application realizes independent scanning of double circular polarization, can independently control the reflection phase of left-handed and right-handed polarization, generates an adjustable phase distribution on the array aperture, and realizes beam scanning. A same-frequency double circular polarization integrated scheme is realized, and two communication channels share one antenna aperture. The two generated beams do not interfere with each other, can be independently scanned, and can transmit signals respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna engineering, and particularly relates to a dual-circularly-polarized independent scanning reconfigurable reflectarray antenna. BACKGROUND

[0002] In the field of wireless communication, array antennas are a kind of high-gain antennas that are widely used. In recent years, reflectarray antennas as a new type of low-cost array antenna have gained more and more attention and application. Common reflectarray antennas generally use a relatively simple linear polarization mode to achieve. However, with the movement and rotation of terminal devices, the polarization direction of electromagnetic waves will also rotate, thereby causing the transmission efficiency of information to be reduced or even unable to be transmitted. The use of circularly-polarized reflectarrays can avoid the above polarization shift problem.

[0003] On the basis of the circularly-polarized reflectarray, a dual-circularly-polarized reflectarray realized by means of the orthogonality of left-handed and right-handed circular polarization can further increase the available channels and realize full-duplex communication or dual-target communication. However, the current reflectarray antenna can only produce a fixed reflection phase for the dual-circularly-polarized reflectarray. That is, after the antenna is manufactured, it can only produce a certain reflection phase designed, and cannot change the reflection phase, and cannot independently control the reflection phases of left-handed and right-handed polarization, and cannot realize real-time beam scanning. SUMMARY

[0004] In view of the above problems, the present application provides a dual-circularly-polarized independent scanning reconfigurable reflectarray antenna.

[0005] The present application provides a dual-circularly-polarized independent scanning reconfigurable reflectarray antenna, which comprises a feed horn antenna and a reconfigurable dual-circularly-polarized reflectarray surface.

[0006] The feed horn antenna serves as a feed source of the reflectarray surface and radiates electromagnetic waves to the reconfigurable dual-circularly-polarized reflectarray surface.

[0007] The reconfigurable dual-circularly-polarized reflectarray surface comprises M*N reconfigurable reflecting units arranged periodically.

[0008] The reconfigurable reflecting unit comprises a first dielectric plate and a second dielectric plate, and the first dielectric plate is connected with the second dielectric plate.

[0009] A metal layer composed of four circular arcs and a cross pattern is arranged on the upper surface of the first dielectric plate, the four circular arcs surround the cross pattern, and each end of the cross pattern corresponds to one circular arc.

[0010] Any three circular arcs in the four circular arcs are respectively connected with one end of the corresponding cross pattern through a diode, and the remaining one circular arc and the corresponding one end of the cross pattern are in an off state.

[0011] The arc connected with the diode is provided with a through hole, which penetrates from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate, and is used for direct current bias feed;

[0012] The lower surface of the first dielectric plate is provided with a reflective metal layer, which is used for reflection of radio frequency signals and grounding of low frequency signals, and is provided with a gap corresponding to the penetration position of the through hole;

[0013] The cross center of the cross-shaped pattern is provided with a blind hole, which is used for communication between the upper surface metal layer and the lower surface metal layer of the first dielectric plate;

[0014] The upper surface of the second dielectric plate is provided with a fan-shaped metal open circuit branch from the penetration of the through hole, which is used for AC / DC isolation;

[0015] The lower surface of the second dielectric plate is provided with a direct current bias circuit from the end of the through hole, so as to connect the end of the through hole with an external control device.

[0016] Optionally, the feed horn antenna comprises a group of left-handed and right-handed circularly polarized horn antennas; or,

[0017] The feed horn antenna comprises a single linear polarization feed horn.

[0018] Optionally, if the feed horn is a group of left-handed and right-handed circularly polarized horn antennas, the dual circularly polarized independent scanning reconfigurable reflectarray antenna has two independent channels for simultaneous transmission or reception, and the reconfigurable dual circularly polarized reflectarray produces two scanning beams.

[0019] If the feed horn is a single linear polarization feed horn, the dual circularly polarized independent scanning reconfigurable reflectarray antenna has one independent channel for simultaneous transmission or reception, and the reconfigurable dual circularly polarized reflectarray produces two scanning beams.

[0020] Optionally, the reconfigurable reflecting unit further comprises a prepreg;

[0021] The first dielectric plate is bonded to the second dielectric plate through the prepreg;

[0022] The through hole penetrates the prepreg, so that the through hole penetrates from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate.

[0023] Optionally, the values of M and N are each an integer greater than or equal to 1;

[0024] The value of M is the same as or different from the value of N.

[0025] Optionally, the remaining 1 segment of the circular arc is connected to one end of the corresponding cross pattern through a diode, and the diode is always in an off state.

[0026] The remaining 1 segment of the circular arc is connected to one end of the corresponding cross pattern through a patch capacitor, and the capacitance value of the patch capacitor is equal to the equivalent capacitance value of the diode in the off state.

[0027] Optionally, the circular arc connected to the cross pattern only through the diode is connected to the positive electrode of the diode, and the negative electrode of the diode is connected to the cross pattern.

[0028] Optionally, the external control device sends a control signal to the three diodes through the through hole and the direct current bias circuit to change the positive electrode voltage of the three diodes, thereby controlling the three diodes to be in an on state or an off state.

[0029] Corresponding to different combinations of the three diodes being in an on state or an off state, four effective control states are generated, and the phase responses of the left-handed circularly polarized incident wave and the right-handed circularly polarized incident wave are set to 0°, 0° or 180°, 180° or 0°, 180° or 180°, 0°, respectively. The four phase responses realize double circular polarization independent phase 1-bit control and independent beam scanning without interference.

[0030] Optionally, the double circular polarization independent scanning reconfigurable reflective array antenna simultaneously generates one left-handed circularly polarized wave and one right-handed circularly polarized wave.

[0031] When the directions of the two beams are different, two independent communication channels without interference are formed.

[0032] When the directions of the two beams are the same, a linearly polarized wave is formed.

[0033] Optionally, if the area of the upper surface of the second dielectric plate allows single-layer layout, the fan-shaped metal open-circuit branch and the direct current bias circuit are combined and laid out to enable compact arrangement of the two on the same surface.

[0034] The double circular polarization independent scanning reconfigurable reflective array antenna provided by the application comprises a feed horn antenna and a reconfigurable double circular polarization reflective array surface.

[0035] The reconfigurable double circular polarization reflective array surface comprises M*N reconfigurable reflective units arranged periodically.

[0036] The upper surface of the first dielectric substrate is provided with a metal layer consisting of four arcs and a cross pattern. The four arcs surround the cross pattern, and each end of the cross pattern corresponds to one arc. Any three of the four arcs are connected to one end of their respective cross pattern through a diode, and the remaining arc is in the off state with one end of its corresponding cross pattern.

[0037] Each arc connected to the diode has a through-hole, which extends from the upper surface of the first dielectric substrate to the lower surface of the second dielectric substrate. The through-hole is used for DC bias feeding. A reflective ground metal layer is disposed on the lower surface of the first dielectric substrate. This metal layer is used for reflecting radio frequency signals and grounding low-frequency signals. A notch is formed in this metal layer corresponding to the position where the through-hole penetrates. A blind via is formed in the center of the cross-shaped pattern, which connects the upper and lower surface metal layers of the first dielectric substrate.

[0038] The upper surface of the second dielectric substrate extends a fan-shaped metal open-circuit stub from the through-hole, which is used for AC / DC isolation; the lower surface of the second dielectric substrate extends a DC bias circuit from the end of the through-hole to connect the end of the through-hole to an external control device.

[0039] This invention creatively proposes a reconfigurable dual-circularly polarized reflective array for traditional reflective array antennas, enabling independent scanning of the dual circular polarizations and allowing independent control of the reflection phases of left-hand and right-hand circular polarizations. It achieves a co-frequency dual-circularly polarized integrated scheme, where two communication channels share a single antenna aperture.

[0040] By integrating active devices such as RF switches and varactor diodes onto the units of a reconfigurable dual-circularly polarized reflective array, the electromagnetic characteristics of each unit are reconfigured according to changes in the operating state of the devices, thereby achieving control over the reflection phase of the unit. A reflective array antenna composed of such units can generate an adjustable phase distribution at the array aperture, achieving beam scanning. The two generated beams do not interfere with each other and can scan independently and transmit signals separately. The dual-circularly polarized independently scanning reconfigurable reflective array antenna proposed in this invention can change the reflection phase and independently control the reflection phases of left-hand and right-hand circular polarization, achieving independent control of the dual-circularly polarized beam, and has high practicality. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0042] Figure 1 This is a general structural diagram of the dual-circularly polarized independently scanning reconfigurable reflective array antenna according to an embodiment of the present invention;

[0043] Figure 2 is a specific structure diagram of a single reconfigurable reflecting unit in the embodiment of the present application;

[0044] Figure 3 is a structure diagram of four circular arcs, a cross pattern and four PIN diodes on the upper surface of the upper layer dielectric plate 2-1 in the embodiment of the present application;

[0045] Figure 4 is a schematic diagram of the diode on state or off state corresponding to four effective states in the embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the above objectives, characteristics and advantages of the present application more apparent, comprehensible and easier to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, are only a part of the embodiments of the present application, and are not used to limit the present application.

[0047] The present application provides a dual circular polarization independent scanning reconfigurable reflecting array antenna, which comprises a feed horn antenna and a reconfigurable dual circular polarization reflecting array surface.

[0048] The reconfigurable dual circular polarization reflecting array surface comprises M*N reconfigurable reflecting units arranged periodically.

[0049] The upper surface of the first dielectric plate is provided with a metal layer composed of four circular arcs and a cross pattern, the four circular arcs surround the cross pattern, and each end of the cross pattern corresponds to one circular arc.

[0050] The circular arc connected with the diode is provided with a through hole, the through hole penetrates from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate, and the through hole is used for direct current bias feed; the lower surface of the first dielectric plate is provided with a reflecting ground metal layer, the metal layer is used for reflection of radio frequency signals and grounding of low frequency signals, and the metal layer is provided with a gap corresponding to the penetration position of the through hole, which is used for penetration of the through hole.

[0051] The cross center of the cross pattern is provided with a blind hole, which is used for communication between the upper surface metal layer and the lower surface metal layer of the first dielectric plate; at the same time, the cross center position becomes an alternating current ground and a direct current ground.

[0052] The upper surface of the second dielectric plate leads out a fan-shaped metal open-circuit branch from the through hole, and the fan-shaped metal open-circuit branch is used for AC / DC isolation; the lower surface of the second dielectric plate leads out a DC bias circuit from the end of the through hole, so as to connect the end of the through hole with an external control device.

[0053] In a possible embodiment, the feed horn antenna can include a set of left-handed and right-handed circularly polarized horns; or the feed horn antenna can include a single linearly polarized feed horn. If the feed horn is a set of left-handed and right-handed circularly polarized horns, the dual circularly polarized independent scanning reconfigurable reflectarray antenna has two independent channels for simultaneous transmission or reception, and the reconfigurable dual circularly polarized reflectarray plane generates two scanning beams; if the feed horn is a single linearly polarized feed horn, the dual circularly polarized independent scanning reconfigurable reflectarray antenna has one independent channel for simultaneous transmission or reception, and the reconfigurable dual circularly polarized reflectarray plane generates two scanning beams.

[0054] The connection between the first dielectric plate and the second dielectric plate can be in various modes, such as welding, bonding, bolt connection, etc. A more preferred mode is bonding. In this connection mode, the reconfigurable reflecting unit further includes a prepreg, the first dielectric plate is bonded to the second dielectric plate through the prepreg, and the through hole is arranged to pass through the prepreg, so that the through hole passes from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate.

[0055] For the reconfigurable dual circularly polarized reflectarray plane, M*N reconfigurable reflecting units are arranged periodically, and M and N are each an integer greater than or equal to 1. In specific value selection, the value of M is the same as or different from the value of N. For example, 2*2 reconfigurable reflecting units are arranged periodically, or 8*5 reconfigurable reflecting units are arranged periodically, etc. The specific number can be determined according to actual needs.

[0056] As described above, the four circular arcs surround the cross-shaped pattern, and any three of the four circular arcs are respectively connected to one end of the corresponding cross-shaped pattern through a diode, and the remaining one circular arc and the corresponding cross-shaped pattern are in an off state. In specific implementation, the remaining one circular arc and the corresponding cross-shaped pattern can be in an off state through various modes. For example, the remaining one circular arc is connected to the corresponding cross-shaped pattern through a diode, and the diode is always in an off state; or the remaining one circular arc is connected to the corresponding cross-shaped pattern through a patch capacitor, and the capacitance value of the patch capacitor is equal to the equivalent capacitance value of the diode in an off state.

[0057] For the three diodes in the non-long-term off state, that is, for the connection between the circular arc and the cross pattern only through the diode, each circular arc is connected with the positive electrode of the corresponding diode, and the negative electrode of the diode is connected with the corresponding cross pattern.

[0058] The external control device can send control signals to the three diodes in the non-long-term off state through the direct current bias circuit and the opened through hole to change the positive electrode voltage of the three diodes, thereby controlling the three diodes to be in the on state or the off state respectively.

[0059] Since each of the three diodes can be in the same state or different states at the same time, different combinations can be generated when the three diodes are in the on state or the off state respectively, a total of eight combinations can be generated, that is, eight states, but only four of them are effective control states, which set the phase responses of the left-handed circularly polarized incident wave and the right-handed circularly polarized incident wave to be 0°, 0° or 180°, 180° or 0°, 180° or 180°, 0° respectively. The four phase responses realize double circular polarization independent phase 1-bit control and independent beam scanning without interference.

[0060] In order to better explain and illustrate the double circular polarization independent scanning reconfigurable reflectarray antenna proposed in the present application, refer to Figure 1 , the overall structure diagram of the double circular polarization independent scanning reconfigurable reflectarray antenna of the embodiment of the present application is shown. Refer to Figure 2 , the specific structure diagram of the reconfigurable reflecting unit in the embodiment of the present application is shown in a specific structure form. Figure 1 , which includes:

[0061] The left-handed circularly polarized feed horn 1-1, the right-handed circularly polarized feed horn 1-2, and the array 1-3 of the periodically equidistantly arranged reconfigurable reflecting units containing M*N. Figure 1 In the embodiment, the array 1-3 of the periodically equidistantly arranged reconfigurable reflecting units containing 16*16 is shown as an example, in which M and N are both taken as the value of 16.

[0062] The left-handed circularly polarized feed horn 1-1 emits left-handed circularly polarized incident wave 1-4 Figure 1 (LHCP on the left in the figure), and the right-handed circularly polarized feed horn 1-2 emits right-handed circularly polarized incident wave 1-5 Figure 1 (RHCP on the left in the figure). After independent phase control by the array 1-3 of the periodically equidistantly arranged reconfigurable reflecting units, two corresponding left-handed circularly polarized outgoing beams 1-6 Figure 1 (LHCP on the right in the figure) and right-handed circularly polarized outgoing beams 1-7 Figure 1The right middle is RHCP). By changing the state of each unit on the reconfigurable reflecting unit array 1-3, the phase response of the left-handed and right-handed polarizations can be independently controlled, thereby independently controlling the scanning directions of the two outgoing beams: the left-handed circularly polarized outgoing beam 1-6 and the right-handed circularly polarized outgoing beam 1-7.

[0063] Figure 2 In the middle, an example is taken as an example of adhesive connection, showing the structure of a single reconfigurable reflecting unit, Figure 2 In the middle, it includes: the first dielectric plate 2-1, the second dielectric plate 2-3 and the prepreg 2-2, in order to better combine Figure 2 To explain and illustrate, the upper dielectric plate 2-1 represents the first dielectric plate 2-1, and the lower dielectric plate 2-3 represents the second dielectric plate 2-3.

[0064] The upper surface of the upper dielectric plate 2-1 is a radiation patch 2-11, which is a metal layer composed of 4 circular arcs and a cross pattern. The 4 circular arcs surround the cross pattern, and each end of the cross pattern corresponds to a circular arc, so there are 4 central symmetrical notches 2-12 on the radiation patch 2-11, which are used for welding diodes or patch capacitors. Among them, the preferred choice of diode is to use PIN diode.

[0065] In the middle of the 3 circular arcs, 3 through holes 2-13, 2-14 and 2-15 are respectively provided, which are connected downward. The 3 through holes 2-13, 2-14 and 2-15 are connected with the lower structure for inputting control signals to generate different control voltages. The central part of the cross pattern is connected with the metal ground 2-17 (i.e. the reflecting ground metal layer) on the lower surface of the upper dielectric plate 2-1 through the blind hole 2-16, so that the central position of the cross pattern becomes AC ground and DC ground at the same time.

[0066] The prepreg 2-2 is used to bond the upper dielectric plate 2-1 and the lower dielectric plate 2-3, and the positions corresponding to the 3 through holes 2-13, 2-14 and 2-15 on the prepreg 2-2 also have holes 2-21, 2-22 and 2-23. Otherwise, the 3 through holes 2-13, 2-14 and 2-15 cannot penetrate the lower dielectric plate 2-3, so that the control signal of the external control device cannot be transmitted.

[0067] The upper surface of the lower dielectric plate 2-3 also has 3 holes corresponding to the positions penetrated by the 3 through holes 2-13, 2-14 and 2-15. The 3 fan-shaped metal open-circuit branches 2-31, 2-32 and 2-33 are led out from the positions penetrated by the 3 through holes 2-13, 2-14 and 2-15, which are used to realize AC and DC isolation. The orientations of the 3 fan-shaped metal open-circuit branches 2-31, 2-32 and 2-33 can be the same or different, but they need to satisfy the condition of not interfering with each other.

[0068] The 3 through-holes 2-34, 2-35, 2-36 of the lower dielectric plate 2-3 are consistent with the aforementioned 3 through-holes 2-13, 2-14, 2-15. The lower surface of the lower dielectric plate 2-3, corresponding to the ends of the 3 through-holes 2-34, 2-35, 2-36, that is, corresponding to the ends of the 3 through-holes 2-13, 2-14, 2-15, leads out DC bias circuits 2-37, 2-38, 2-39 to connect with an external control device (not shown). The external control device sends control signals to the 3 diodes through the DC bias circuits, the through-holes 2-34, 2-35, 2-36, 2-21, 2-22, 2-23, 2-13, 2-14, 2-15, respectively. Figure 2

[0069] In order to more clearly show the structure of the radiation patch 2-11, Figure 3 The structure diagram of the upper surface of the upper dielectric plate 2-1 is shown, which includes 4 circular arcs, a cross pattern, and 4 PIN diodes. The positive poles of all PIN diodes are connected to the middle sections of the respective circular arcs, and the negative poles are connected to one end of the cross pattern, that is, connected to the center of the cross pattern. It should be noted that the length of the circular arc will affect the reflection phase value of the dual circularly polarized independent scanning reconfigurable reflectarray antenna, and thus affect the gain, so in actual design, simulation testing needs to be performed to determine the length of the circular arc to ensure that the gain of the dual circularly polarized independent scanning reconfigurable reflectarray antenna meets the actual demand.

[0070] Except for the PIN4 diode, the other 3 diodes PIN1, PIN2, PIN3 can have their positive pole voltages changed by an externally introduced control signal, thereby switching the on and off states of the 3 diodes PIN1, PIN2, PIN3. Generally, a high-level signal (1.33V) causes the PIN diode to be in an on state, and a low-level signal (0V) causes the PIN diode to be in an off state.

[0071] According to the different positive pole voltages of the 3 diodes PIN1, PIN2, PIN3, there are a total of 8 switching states, of which 4 switching states can produce different phase responses to left-handed and right-handed circularly polarized electromagnetic waves of the same frequency band, so these 4 switching states are referred to as effective control states.

[0072] The 4 effective control states respectively set the phase responses of left-handed and right-handed circularly polarized incident waves to be 0°, 0°, or 180°, 180°, or 0°, 180°, or 180°, 0°. The 4 phase responses realize dual circularly polarized independent phase 1-bit control and independent beam scanning without interference.

[0073] Referring to Figure 4 the diode on or off state diagram corresponding to the 4 effective states is shown.​Figure 4 In the example, the phase responses of the left-handed and right-handed circularly polarized waves are 0° or 180° in each diode on or off state, and the four effective control states are named as state 00, state 11, state 01 and state 10. Figure 4 In the example, the "X" symbol indicates that the diode is in the off state, and the position without the "X" symbol indicates that the diode is in the on state. The solid line with an arrow directly connects the center of the cross-shaped figure to the through hole on the corresponding circular arc.

[0074] In the state 00, the diode PIN1 is in the on state, and the diodes PIN2 and PIN3 are in the off state, and the phase responses of the left-handed and right-handed circularly polarized waves are 0° / 0°. In the state 11, the diode PIN2 is in the on state, and the diodes PIN1 and PIN3 are in the off state, and the phase responses of the left-handed and right-handed circularly polarized waves are 180° / 180°.

[0075] In the state 01, the diodes PIN1 and PIN2 are in the on state, and the diode PIN3 is in the off state, and the phase responses of the left-handed and right-handed circularly polarized waves are 0° / 180°. In the state 10, the diodes PIN2 and PIN3 are in the on state, and the diode PIN1 is in the off state, and the phase responses of the left-handed and right-handed circularly polarized waves are 180° / 0°.

[0076] The above four states 00, 11, 01 and 10 contain all the phase values required for 1-bit phase independent control of left-handed and right-handed polarizations. Each polarization can independently select 0° or 180° reflection phase, and therefore can be used for double circularly polarized independent beam control.

[0077] In addition, since the double circularly polarized independent scanning reconfigurable reflective array antenna can simultaneously generate one left-handed and one right-handed beam, when the directions of the two beams are different, two independent communication channels are formed without interference. When the directions of the two beams are the same, a linearly polarized beam is formed.

[0078] Considering the actual manufacturing situation, if the second dielectric plate, i.e. Figure 2 In the example, the upper surface area of the lower dielectric plate 2-3 is relatively sufficient, and the fan-shaped metal open-circuit branches 2-31, 2-32 and 2-33 originally arranged on the upper surface of the lower dielectric plate 2-3 and the DC bias circuits 2-37, 2-38 and 2-39 originally arranged on the lower surface of the lower dielectric plate 2-3 can be combined and arranged. In this way, the fan-shaped metal open-circuit branches 2-31, 2-32 and 2-33 and the DC bias circuits 2-37, 2-38 and 2-39 can be arranged compactly on the same surface, so as to reduce the number of metal surface layers of the reconfigurable reflective unit, and further reduce the number of metal surface layers of the reconfigurable double circularly polarized reflective array.

[0079] In summary, the double circular polarization independent scanning reconfigurable reflectarray antenna of the application comprises: a feed horn antenna and a reconfigurable double circular polarization reflectarray surface; the feed horn antenna serves as the feed of the reflectarray surface and radiates electromagnetic waves to the reconfigurable double circular polarization reflectarray surface.

[0080] The reconfigurable double circular polarization reflectarray surface comprises: M*N reconfigurable reflecting units arranged periodically; the reconfigurable reflecting unit comprises: a first dielectric plate and a second dielectric plate, and the first dielectric plate is connected with the second dielectric plate.

[0081] The upper surface of the first dielectric plate is provided with a metal layer composed of four circular arcs and a cross pattern, the four circular arcs surround the cross pattern, and each end of the cross pattern corresponds to one circular arc; any three circular arcs in the four circular arcs are respectively connected with one end of the corresponding cross pattern through a diode, and the remaining one circular arc and the corresponding one end of the cross pattern are in an off state.

[0082] The circular arc connected with the diode is respectively provided with a through hole penetrating from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate, and the through hole is used for direct current bias feed; the lower surface of the first dielectric plate is provided with a reflecting ground metal layer, and the metal layer is used for reflection of radio frequency signals and grounding of low frequency signals, and the metal layer is provided with a gap corresponding to the penetration position of the through hole. A blind hole is formed in the center of the cross pattern, and the blind hole is used for communication between the upper surface metal layer and the lower surface metal layer of the first dielectric plate.

[0083] A fan-shaped metal open-circuit branch is led out from the penetration of the through hole on the upper surface of the second dielectric plate, and the fan-shaped metal open-circuit branch is used for alternating current and direct current isolation; a direct current bias circuit is led out from the end of the through hole on the lower surface of the second dielectric plate, so as to connect the end of the through hole with an external control device.

[0084] The application creatively proposes a reconfigurable double circular polarization reflectarray surface for the traditional reflectarray antenna, realizes independent scanning of double circular polarization, and enables independent control of the reflection phase of left-handed and right-handed polarization. The application realizes a same-frequency double circular polarization integration scheme, and two communication channels share one antenna port surface.

[0085] The active devices such as radio frequency switches and varactor diodes are integrated on the unit of the reconfigurable dual circularly polarized reflectarray, so that the electromagnetic characteristics of each unit are reconfigured with the change of the working state of the device, thereby realizing the control of the reflection phase of the unit. The reflectarray antenna composed of such units can produce an adjustable phase distribution on the array aperture, and realize beam scanning. The two beams produced do not interfere with each other, and can be independently scanned and transmit signals respectively. The dual circularly polarized independent scanning reconfigurable reflectarray antenna provided by the application can change the reflection phase, independently control the reflection phases of left-handed and right-handed polarizations, realize independent control of the reflected dual circularly polarized beams, and has high practicability.

[0086] Although the preferred embodiments of the embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the embodiments of the application.

[0087] Finally, it should also be noted that, in this document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0088] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the application without departing from the purpose of the application and the scope protected by the claims, which all belong to the protection of the application.

Claims

1. A dual-circularly polarized independently scanning reconfigurable reflective array antenna, characterized in that, include: Feed-horn antenna and reconfigurable dual-circularly polarized reflector array; The feed horn antenna serves as the feed source for the reflector array, radiating electromagnetic waves into the reconfigurable dual-circularly polarized reflector array. The reconfigurable dual-circular polarized reflective array comprises: M*N periodically arranged reconfigurable reflective elements; The reconfigurable reflection unit includes: a first dielectric plate and a second dielectric plate, wherein the first dielectric plate and the second dielectric plate are connected; The upper surface of the first dielectric substrate is provided with a metal layer consisting of four arc segments and a cross pattern. The four arc segments surround the cross pattern, and each end of the cross pattern corresponds to one arc segment. Of the four arc segments, any three arc segments are each connected to one end of their respective cross-shaped pattern via a diode, while the remaining arc segment is in an off state with one end of its corresponding cross-shaped pattern. Each arc connected to the diode has a through hole, which extends from the upper surface of the first dielectric substrate to the lower surface of the second dielectric substrate. The through hole is used for DC bias feeding. A reflective ground metal layer is provided on the lower surface of the first dielectric substrate. This metal layer is used for reflecting radio frequency signals and grounding low frequency signals. A notch is provided in the metal layer corresponding to the through position of the via. A blind hole is provided in the center of the cross pattern, which is used for communication between the upper and lower surface metal layers of the first dielectric plate. A sector-shaped metal open-circuit spur extends from the through-hole on the upper surface of the second dielectric plate. The sector-shaped metal open-circuit spur is used for AC / DC isolation. A DC bias circuit is led out from the end of the through hole on the lower surface of the second dielectric substrate to connect the end of the through hole to an external control device; The dual-circularly polarized independent scanning reconfigurable reflective array antenna simultaneously generates one left-handed and one right-handed beam. When the two beams are in different directions, two independent communication channels that do not interfere with each other are formed; When the two beams are in the same direction, they are combined into a single linearly polarized beam.

2. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 1, characterized in that, The feed horn antenna includes: a set of left-hand and right-hand circularly polarized horns; or... The feed horn antenna includes: a single linearly polarized feed horn.

3. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 2, characterized in that, If the feed horn is a set of left-hand and right-hand circularly polarized horns, then the dual-circularly polarized independent scanning reconfigurable reflective array antenna has two independent channels for simultaneously transmitting electromagnetic waves or two independent channels for simultaneously receiving electromagnetic waves, and the dual-circularly polarized independent scanning reconfigurable reflective array antenna generates two scanning beams. If the feed horn is a single linearly polarized feed horn, then the dual-circularly polarized independently scanned reconfigurable reflective array antenna has one independent channel for transmitting or receiving electromagnetic waves, and the dual-circularly polarized independently scanned reconfigurable reflective array antenna generates two scanning beams.

4. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 1, characterized in that, The reconfigurable reflective unit further includes: a prepreg; The first dielectric substrate is bonded to the second dielectric substrate via the prepreg; The through hole penetrates the prepreg so that it extends from the upper surface of the first dielectric plate to the lower surface of the second dielectric plate.

5. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 1, characterized in that, The values ​​of M and N are both any integers greater than 1; The value of M may be the same as or different from the value of N.

6. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 1, characterized in that, The remaining arc segment is connected to one end of the corresponding cross shape via a diode, and this diode is always in the off state; or, The remaining arc segment is connected to one end of the corresponding cross shape via a surface-mount capacitor. The capacitance of the surface-mount capacitor is equal to the equivalent capacitance of the diode in the off state.

7. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 1, characterized in that, The arc and the cross pattern are connected only by a diode, with the arc connected to the positive terminal of the diode and the negative terminal of the diode connected to the cross pattern.

8. The dual-circularly polarized independently scanning reconfigurable reflective array antenna according to claim 7, characterized in that, The external control device sends control signals to the three diodes through the DC bias circuit and the through hole to change the positive voltage of the three diodes, thereby controlling the three diodes to be in the on or off state respectively. The different combinations of the three diodes being in the on or off state generate four effective control states, which respectively set the phase response of the left-hand and right-hand circularly polarized incident waves to 0°, 0° or 180°, 180° or 0°, 180° or 180°, 0°. These four phase responses realize independent phase 1-bit control of dual circular polarization, perform independent beam scanning, and do not interfere with each other.

9. A dual-circularly polarized independently scanning reconfigurable reflective array antenna, characterized in that, include: Feed-horn antenna and reconfigurable dual-circularly polarized reflector array; The feed horn antenna serves as the feed source for the reflector array, radiating electromagnetic waves into the reconfigurable dual-circularly polarized reflector array. The reconfigurable dual-circular polarized reflective array comprises: M*N periodically arranged reconfigurable reflective elements; The reconfigurable reflection unit includes: a first dielectric plate and a second dielectric plate, wherein the first dielectric plate and the second dielectric plate are connected; The upper surface of the first dielectric substrate is provided with a metal layer consisting of four arc segments and a cross pattern. The four arc segments surround the cross pattern, and each end of the cross pattern corresponds to one arc segment. Of the four arc segments, any three arc segments are each connected to one end of their respective cross-shaped pattern via a diode, while the remaining arc segment is in an off state with one end of its corresponding cross-shaped pattern. Each arc connected to the diode has a through hole, which extends from the upper surface of the first dielectric substrate to the lower surface of the second dielectric substrate. The through hole is used for DC bias feeding. A reflective ground metal layer is provided on the lower surface of the first dielectric substrate. This metal layer is used for reflecting radio frequency signals and grounding low frequency signals. A notch is provided in the metal layer corresponding to the through position of the via. A blind hole is provided in the center of the cross pattern, which is used for communication between the upper and lower surface metal layers of the first dielectric plate. A sector-shaped metal open-circuit spur extends from the through-hole on the upper surface of the second dielectric plate. The sector-shaped metal open-circuit spur is used for AC / DC isolation. A DC bias circuit is led out from the end of the through hole on the upper surface of the second dielectric substrate to connect the end of the through hole to an external control device. The dual-circularly polarized independent scanning reconfigurable reflective array antenna simultaneously generates one left-handed and one right-handed beam. When the two beams are in different directions, two independent communication channels that do not interfere with each other are formed; When the two beams are in the same direction, they are combined into a single linearly polarized beam.

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