A spatial non-resonant node resonator, filter and radio frequency communication device

Abstract

The application discloses a kind of space non-resonant node resonator, filter and radio frequency communication equipment, and the resonator is loaded by periodic capacitance type or inductive type device to form capacitance type space non-resonant node unit or inductive type space non-resonant node unit;Capacitance or inductive type space non-resonant node unit is arranged and combined by the same kind or two kinds of space non-resonant node unit mixed to form space filter.The application has the characteristics of controllable transmission zero, low profile and high out-of-band rejection, wide application occasions, wide coverage;Moreover, the structure of the space filter of the application is simple, in addition to not occupying the volume of antenna, PCB processing technology can also be used to make the design cost low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency communication technology, in particular to a spatial non-resonant node resonator, a filter and a radio frequency communication device. BACKGROUND

[0002] In the 5G era, modern wireless communication systems are rapidly developing, and more and more frequency bands are needed for mobile communication. However, the space available for communication devices in a communication system is limited, which requires many communication devices of different frequency bands to share a limited space. As the radiator of wireless communication, the antenna must also meet such requirements. However, when different frequency band antennas coexist in a small space, the mutual coupling between the antennas will inevitably lead to an increase in the correlation between antennas of different frequency bands, resulting in a deterioration of antenna performance and affecting the communication quality of the system.

[0003] In order to further illustrate the above problems, taking a multi-frequency base station as an example. With the development of wireless communication technology, multiple wireless frequency bands such as 3G / 4G / 5G need to be compatible on the base station. However, due to the limitation of the surface resources, the base station antenna needs to be smaller in size so as to be installed on the tower. This leads to the need to integrate a large number of antennas working at different frequency bands in a limited space, resulting in strong mutual coupling between the antennas and deteriorating the wireless communication quality.

[0004] In order to integrate more frequency band antennas in a smaller volume, different frequency band antennas can be integrated in a stacked manner, and the upper and lower antennas are separated by a low-profile spatial filter. The spatial filter can transmit the radiation signal of the lower antenna and suppress and reflect the radiation signal of the upper antenna, which not only improves the isolation between the antennas and reduces the mutual coupling level, but also reduces the reflector plate of the upper antenna, realizing the integration of multi-frequency antennas in a small volume. SUMMARY

[0005] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the primary purpose of the present application is to provide a spatial non-resonant node resonator.

[0006] Another purpose of the present application is to provide a filter, specifically a spatial bandpass filter.

[0007] Still another purpose of the present application is to provide a radio frequency communication device.

[0008] The present application overcomes the defects of the prior art that the transmission zero point of the spatial filter is difficult to control, the profile is high, and the equivalent circuit structure is complex, and is suitable for application scenarios where multi-frequency antennas coexist in a stacked structure. It not only provides out-of-band suppression for the antenna below the stacked structure and reduces the mutual coupling between the upper and lower layer antennas, but also reflects the radiation energy of the upper layer antenna, saving the reflector metal plate.

[0009] The purpose of the present application is achieved by the following technical solutions:

[0010] A spatial non-resonant node resonator, a periodic capacitive or inductive device loaded resonator constitutes a capacitive spatial non-resonant node unit or an inductive spatial non-resonant node unit; the capacitive or inductive spatial non-resonant node unit is composed of the same or mixed two kinds of spatial non-resonant node units by arrangement and combination, to form a spatial filter.

[0011] Further, the capacitive spatial non-resonant node unit includes an open-circuit transmission line, a dielectric substrate, and a capacitive loop resonator, the open-circuit transmission line is arranged on the top layer of the dielectric substrate, and the capacitive loop resonator is arranged on the bottom layer of the dielectric substrate, the open-circuit transmission line excites the capacitive loop resonator by radiating a magnetic field into space, which is equivalent to a parallel capacitor in circuit by electromagnetic coupling and excitation of a parallel resonator, to form a capacitive spatial non-resonant node unit.

[0012] Further, the open-circuit transmission line is composed of two open-circuit metal strip lines that are perpendicular to each other and cross each other, the open-circuit transmission line is excited by two mutually perpendicular polarization electric fields, to achieve a dual-polarization characteristic.

[0013] Further, when the length of the open-circuit transmission line is less than 1 / 4 wavelength, it is equivalent to a parallel capacitor in a transmission path;

[0014] When the circumference of the capacitive loop resonator is equal to 1 / 2 wavelength, the capacitive loop resonator is excited by the magnetic field generated by the transmission line, to generate loop currents in opposite directions that cancel each other out and reduce the electromagnetic wave energy radiated outward by the resonator, and the wavelength refers to the wavelength in vacuum at the center frequency point of the working frequency.

[0015] Further, the inductive spatial non-resonant node unit includes a short-circuit transmission line, a dielectric substrate, and an inductive loop resonator, the short-circuit transmission line and the loop resonator are respectively located on the top layer and the bottom layer of the dielectric substrate, the short-circuit transmission line excites the loop resonator by radiating a magnetic field into space, which is equivalent to a parallel inductor in circuit by magnetic coupling and excitation of a parallel resonator, to form an inductive spatial non-resonant node unit.

[0016] Further, the short-circuit transmission line is composed of two short-circuit metal strip lines that are perpendicular to each other and cross each other.

[0017] Further, the periodic inductive spatial non-resonant node unit and the capacitive spatial non-resonant node unit generate a transmission zero point and a resonant frequency in space, the transmission zero point frequency of the capacitive spatial non-resonant node unit is less than the resonant frequency, and the transmission zero point frequency of the inductive spatial non-resonant node unit is greater than the resonant frequency.

[0018] A spatial filter comprises a plurality of the spatial non-resonant node resonator, the spatial non-resonant node resonator is mutually coupled in a stacked structure, and collectively constitutes a multi-stage spatial filter network.

[0019] Further, the adjacent resonators are spaced by air medium.

[0020] A radio frequency communication device comprises the spatial filter.

[0021] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0022] The antenna of the present application can arbitrarily modulate the relationship between the transmission zero point and the resonant frequency by designing the capacitive and inductive spatial non-resonant node resonator unit; the non-resonant node resonator unit can be combined with itself or other resonators to form a multi-stage filter network.

[0023] The antenna of the present application has the characteristics of controllable transmission zero point, low profile and high out-of-band suppression, and is widely used and has a large coverage range.

[0024] The spatial filter of the present application has a simple structure, does not occupy additional antenna volume, and can be processed using PCB technology to reduce the design cost; therefore, compared with the current bandpass filter design scheme, it is more conducive to the low-cost and integration of the device. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained from the structure shown in the drawings.

[0026] Figure 1 The structure of the capacitive spatial non-resonant node unit of the present application.

[0027] Figure 2 The specific implementation structure of the capacitive spatial non-resonant node unit in a period.

[0028] Figure 3 The equivalent circuit diagram of the capacitive spatial non-resonant node unit of the present application.

[0029] Figure 4 The filter response curve diagram of the capacitive spatial non-resonant node unit of the present application.

[0030] Figure 5 The structure of the inductive spatial non-resonant node unit of the present application.

[0031] Figure 6 A specific implementation structure of the periodic inductive type spatial non-resonant node unit in one cycle.

[0032] Figure 7 An equivalent circuit diagram of the inductive type spatial non-resonant node unit of the present application.

[0033] Figure 8 A filter response curve diagram of the inductive type spatial non-resonant node unit of the present application.

[0034] Figure 9 A specific implementation structure diagram of the periodic mixed type spatial 2nd order non-resonant node filter of the present application.

[0035] Figure 10 A specific implementation structure diagram of the mixed type spatial 2nd order non-resonant node filter unit of the present application.

[0036] Figure 11 An equivalent circuit diagram of the mixed type spatial 2nd order non-resonant node filter of the present application.

[0037] Figure 12 A filter response curve diagram of the mixed type spatial 2nd order non-resonant node filter of the present application.

[0038] The figure shows:

[0039] 1 - cross point, 2 - open transmission line, 3 - first dielectric substrate, 4 - capacitive ring resonator, 5 - periodic boundary; 6 - short-circuit transmission line, 7 - second dielectric substrate, 8 - inductive ring resonator, 9 - air medium. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below in conjunction with examples, but the embodiments of the present application are not limited thereto.

[0041] Example 1

[0042] A spatial non-resonant node resonator is composed of a capacitive type spatial non-resonant node unit or an inductive type spatial non-resonant node unit by loading resonators with periodic capacitive type or inductive type devices; the capacitive or inductive type spatial non-resonant node unit is composed of the same type or two types of mixtures by arrangement and combination to form a spatial filter.

[0043] As Figures 1-4As shown, a capacitive spatial non-resonant node unit includes an open-circuit transmission line 2, a first dielectric substrate 3 and a capacitive loop resonator 4, the open-circuit transmission line is arranged on the top layer of the first dielectric substrate 3, and the capacitive loop resonator is arranged on the bottom layer of the first dielectric substrate, the capacitive loop resonator is composed of a periodic metal loop, the open-circuit transmission line excites the capacitive loop resonator 4 by radiating a magnetic field into space, which is equivalent to a parallel capacitor in the circuit by electromagnetic coupling and exciting a parallel resonator, forming a capacitive spatial non-resonant node unit.

[0044] Further, the first dielectric substrate 3 is a PCB substrate.

[0045] Further, the open-circuit transmission line is composed of two mutually perpendicular and intersecting metal strip lines, the two metal strip lines intersect to form an intersection point 1, the metal strip lines are attached to the top layer of the first dielectric substrate 3 and do not contact the periodic boundary 5 within one period unit, forming an open-circuit structure, and the capacitive loop resonator is arranged in the four quadrants of the two perpendicular intersecting metal strip lines.

[0046] Further, the two mutually perpendicular and intersecting open-circuit metal strip lines have a length less than λg / 4 (λg is the guided wave wavelength), and can be excited by electromagnetic waves in space that are mutually perpendicular and along the two polarization directions of the metal strip lines; when the metal strip lines are excited by incoming waves in space, it is equivalent to a parallel capacitor in the transmission path.

[0047] Further, the perimeter of the capacitive loop resonator in the capacitive spatial non-resonant node unit is equal to λg / 2, and when excited by a parallel electric field, it cannot form an effective resonant circuit and produce a resonant frequency; only when the capacitive loop resonator is excited by a magnetic field perpendicular to the loop plane, it is equivalent to a parallel resonant circuit in the circuit, and at the same time, it produces a reverse (simultaneous phase inversion) current on each side of the resonator, thereby reducing the radiation of the loop resonator and enhancing the storage of electromagnetic energy.

[0048] The mutually perpendicular and intersecting open-circuit transmission lines excite the capacitive loop resonator by radiating a magnetic field into space, which is equivalent to a parallel capacitor in the circuit by magnetic coupling to excite a parallel resonator, together forming a capacitive spatial non-resonant node unit. Figure 2 The capacitive spatial non-resonant node unit shown can simultaneously produce a resonant and a transmission zero point, and the transmission zero point frequency is less than the resonant frequency.

[0049] As shown in the figure, Figures 5-8As shown, an inductive type space non-resonant node unit includes a short-circuit transmission line 6, a second dielectric substrate 7 and an inductive loop resonator 8, the short-circuit transmission line is arranged on the top layer of the second dielectric substrate 7, and the inductive loop resonator is arranged on the bottom layer of the second dielectric substrate, the inductive loop resonator is composed of a periodic metal loop, the short-circuit transmission line 6 excites the loop resonator by radiating a magnetic field into space, which is equivalent to a parallel inductance in the circuit, and the parallel inductance excites a parallel resonator through magnetic coupling, thereby forming an inductive type space non-resonant node unit.

[0050] Further, the short-circuit transmission line 6 is composed of short-circuit metal strip lines that are perpendicular to each other, the length of the metal strip line is less than λg / 4 (λg is the guided wave wavelength), and the metal strip line can be excited by electromagnetic waves in space that are perpendicular to each other and along the two polarization directions of the metal strip line; when the metal strip line is excited by a space incoming wave, it is equivalent to a parallel inductance in a transmission path.

[0051] Further, the circumference of the inductive loop resonator is equal to λg / 2, and when the inductive loop resonator is excited by a parallel magnetic field, an effective resonant circuit cannot be formed; only when the inductive loop resonator is excited by a magnetic field perpendicular to the loop plane, it is equivalent to a parallel resonant circuit in the circuit, and at the same time, reverse (simultaneous reverse phase) currents are generated on each side of the resonator, thereby reducing the radiation of the loop resonator and enhancing the storage of electromagnetic energy.

[0052] Further, the short-circuit transmission line that is perpendicular to each other excites the loop resonator by radiating a magnetic field into space, which is equivalent to a parallel inductance in the circuit, and the parallel inductance excites a parallel resonator through magnetic coupling, thereby forming an inductive type space non-resonant node unit. Figure 4 As shown, an inductive type space non-resonant node filter unit; can simultaneously generate a resonance and a transmission zero point, and the transmission zero point frequency is greater than the resonance frequency.

[0053] In this embodiment Figure 4 It is illustrated that a capacitive type non-resonant node can generate a resonance and a radiation zero point, and the radiation zero point frequency is less than the resonance frequency; Figure 8 On the contrary, the radiation zero point frequency is greater than the resonance frequency.

[0054] Embodiment 2

[0055] A space filter includes at least two space non-resonant node resonators, which are periodically extended to form a space band-pass filter.

[0056] Further, the space filter can be of capacitive or inductive type, or a combination of capacitive and inductive type.

[0057] The space non-resonant node resonator unit can be stacked in a layered manner to form a multi-stage resonant network and realize a multi-stage filtering response; and on this basis, the space filter is formed by periodically extending the space non-resonant node resonator unit.

[0058] As shown in Figure 9 A spatial filter is composed of spatial non-resonant node resonators, which are composed of capacitive spatial non-resonant node units and inductive spatial non-resonant node units, and the two resonator units are electromagnetically coupled through air medium 9 to form a second-order filter network, which can achieve a second-order filter response in space.

[0059] As shown in Figures 10-12 The simulation result diagram of the mixed spatial non-resonant node filter is shown in the embodiment of the present application, and it can be seen that the spatial filter achieves a second-order filter response. In the passband, the impedance matching is good, the impedance bandwidth is 5.0-5.5 GHz, and the return loss is below -8 dB; outside the passband, two transmission zeros are generated on both sides of the passband of the spatial filter, which significantly improves the out-of-band suppression on both sides of the passband. Therefore, the embodiment realizes good filter performance on a lower spatial filter profile.

[0060] Embodiment 3

[0061] A radio frequency communication device comprising the spatial filter of embodiment 2.

[0062] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application shall be equivalent replacement methods, and shall be included in the protection scope of the present application.

Claims

1. A spatial filter, characterized by, The spatial non-resonant node resonator includes a plurality of spatial non-resonant node resonators which are coupled to each other in a stacked structure to form a multi-order spatial filter network. The spatial non-resonant node resonator is formed by a periodic capacitive or inductive device loaded resonator to form a capacitive spatial non-resonant node unit or an inductive spatial non-resonant node unit; the capacitive or inductive spatial non-resonant node unit is formed by arrangement and combination of the same or mixed spatial non-resonant node units to form a spatial filter. The capacitive spatial non-resonant node unit includes an open-circuit transmission line, a dielectric substrate and a capacitive loop resonator; the open-circuit transmission line is arranged on a top layer of the dielectric substrate, and the capacitive loop resonator is arranged on a bottom layer of the dielectric substrate; the open-circuit transmission line excites the capacitive loop resonator by radiating a magnetic field to the space, and is equivalent to a parallel capacitor in a circuit by electromagnetic coupling and excitation of the parallel resonator, thereby forming the capacitive spatial non-resonant node unit. The open-circuit transmission line is formed by two open-circuit metal strip lines which are perpendicular to each other and cross each other; the open-circuit transmission line is excited by two mutually perpendicular polarized electric fields to realize a dual-polarization characteristic. When the capacitive loop resonator is excited by a magnetic field perpendicular to a loop plane, it is equivalent to a parallel resonant circuit in a circuit, and meanwhile, reverse currents are generated on each side of the resonator, thereby reducing radiation of the loop resonator and enhancing storage of electromagnetic energy. The inductive spatial non-resonant node unit includes a short-circuit transmission line, a dielectric substrate and an inductive loop resonator; the short-circuit transmission line and the loop resonator are arranged on a top layer and a bottom layer of the dielectric substrate, respectively; the short-circuit transmission line excites the loop resonator by radiating a magnetic field to the space, and is equivalent to a parallel inductor in a circuit by magnetic coupling and excitation of the parallel resonator, thereby forming the inductive spatial non-resonant node unit. The short-circuit transmission line is formed by two short-circuit metal strip lines which are perpendicular to each other and cross each other. The periodic inductive spatial non-resonant node unit and the capacitive spatial non-resonant node unit generate a transmission zero point and a resonant frequency in space; the transmission zero point frequency of the capacitive spatial non-resonant node unit is smaller than the resonant frequency, and the transmission zero point frequency of the inductive spatial non-resonant node unit is greater than the resonant frequency. When the inductive loop resonator is excited by a magnetic field perpendicular to a loop plane, it is equivalent to a parallel resonant circuit in a circuit, and meanwhile, reverse currents are generated on each side of the resonator, thereby reducing radiation of the loop resonator and enhancing storage of electromagnetic energy.

2. The spatial filter of claim 1, wherein, When the length of the open-circuit transmission line is less than 1 / 4 wavelength, it is equivalent to a parallel capacitor in a transmission path. When the circumference of the capacitive loop resonator is equal to 1 / 2 wavelength, the capacitive loop resonator is excited by a magnetic field generated by the transmission line to generate loop currents in opposite directions, which offset each other's radiation, thereby reducing radiation of electromagnetic wave energy of the resonator to the outside.

3. The spatial filter of claim 1, wherein, Adjacent resonators are separated by air medium.

4. A radio frequency communication device, characterized by The spatial filter includes the spatial filter of any one of claims 1-3.

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