142 results about "Transmission zeros" patented technology

An IPD high-selectivity band-pass filter based on a weak coupling transformer technology comprises an LC parallel resonance circuit, an LC series resonance circuit, an LC parallel resonance circuit and a fourth capacitor C4, and inductors in the LC parallel resonance circuit and inductors in the LC parallel resonance circuit have a weak transformer coupling relation; the coupling coefficient required by the weak coupling transformer provided by the invention is very small and can be realized in a mode of adjacently placing metals on the same layer, so that the structural complexity of the filter is effectively reduced; the band-pass filter is based on an IPD technology, an extra decoupling equivalent inductor is introduced through a weak transformer coupling technology, the extra decoupling equivalent inductor and a parallel capacitor which is connected between the input end and the output end of the filter in a bridging mode form a new resonance path, and a transmission zero point is introduced into an upper stop band and a lower stop band of the filter respectively to improve the selectivity of the filter. According to the invention, the selectivity of the filter can be effectively improved on the premise of not additionally introducing an inductance element and not increasing the order of the filter.

The invention discloses an intermediate frequency filter chip based on a gallium arsenide IPD process, which adopts the GaAs IPD process with three metal layers and comprises six resonators, twelve capacitors and three metalized grounding holes. The six resonators are composed of capacitors C1-C6 and inductors L1-L6 which are connected in series / in parallel, the inductors are all of self-built octagonal structures, and wiring is only conducted on the middle layer and the uppermost metal layer; a branch series capacitor Ca-Cc and a main parallel capacitor Cd-Cf respectively form six transmission zeros outside a low-frequency band and a high-frequency band. According to the invention, the characteristics of small size and wide band of the filter chip are realized, the loss is reduced, the in-band flatness is improved, and the filter chip has high frequency selectivity and high out-of-band rejection capability.

The invention discloses a high-selectivity waveguide filter based on a nonlinear frequency-variable coupling structure, which comprises three rectangular waveguide resonant cavities, an input waveguide port and an output waveguide port, and the first coupling metal column, the first coupling diaphragm, the first coupling metal block and the first metal baffle plate between the first resonant cavity and the second resonant cavity jointly form a first group of nonlinear frequency change coupling structures. And a second coupling metal column, a second coupling diaphragm, a second coupling metal block and a second metal baffle plate between the second rectangular waveguide resonant cavity and the third rectangular waveguide resonant cavity jointly form a second group of nonlinear frequency change coupling structures. The two groups of nonlinear frequency-variable coupling structures are used for coupling the three rectangular waveguide resonant cavities, and a reflection zero point and two transmission zero points are introduced into each rectangular waveguide resonant cavity, so that the filter response is a five-order Chebyshev response with four transmission zero points. The filter has the advantages of being compact in structure, high in selectivity, good in out-of-band rejection performance, simple in structure, easy to expand and the like, and has a good application prospect.

The invention provides a multichannel SIW filtering jumper and a communication device, and belongs to the technical field of filtering jumpers. The multichannel SIW filtering jumper comprises m * n SIW rectangular dual-mode resonant cavities which are arranged in m rows and n columns and work in a TE102 and TE201 orthogonal degenerate mode, m > 0, and n > 0; each row of SIW rectangular dual-mode resonant cavities corresponds to a horizontal channel, each column of SIW rectangular dual-mode resonant cavities corresponds to a vertical channel, two adjacent SIW rectangular dual-mode resonant cavities are coupled through a common wall, and a coupling window is located in a weakest electric field area of any one of the SIW rectangular dual-mode resonant cavities. According to the multichannel SIW filtering jumper, the number of channels and the working center frequency, the working bandwidth, the working order and the transmission zero point of each channel can be independently set.

The invention belongs to the technical field of integrated circuits, and discloses a high-selectivity constant-bandwidth reconfigurable filter chip based on a GaAs (gallium arsenide) process, which comprises a dielectric substrate, a multilayer metal structure, a plurality of folded opening-shaped metal microstrip lines, a plurality of grounding metal columns, a variable capacitance diode, an MIM (metal injection molding) capacitor and the like. Resonance is realized in a mode of combining electric coupling and magnetic coupling, a variable capacitance diode is utilized to tune the center frequency, and the bandwidth is kept constant in the tuning process. Transmission zeros are introduced at two sides of a passband through cross coupling, so that the frequency selectivity and the spectrum management capability are remarkably improved, and meanwhile, the optimization of the microstrip interconnection structure effectively reduces the system loss. According to the invention, the strict requirements of a modern radio frequency communication system on miniaturization, high performance and high selectivity can be met, and extremely high adjustability and adaptability are achieved.

The invention discloses a high-isolation and high-selectivity filtering power divider with an input end broadband non-reflection characteristic. Comprising an input port, two output ports, a double-L-shaped non-reflection absorption structure, two microstrip connecting lines, two parallel coupling lines, two L-shaped step resonators, two non-reflection absorption isolation resistors, a quarter-wavelength parallel coupling connecting line and two U-shaped transmission lines. The input port is a first port; the two output ports comprise a port II and a port III; the double-L-shaped non-reflection absorption structure comprises a first non-reflection absorption resistor, a second non-reflection absorption resistor, a first L-shaped non-reflection absorption connecting line and a second L-shaped non-reflection absorption connecting line. According to the invention, the broadband reflection-free absorption characteristic of the input end and the broadband high isolation between the output ports are realized at the same time, a plurality of transmission zeros are introduced through the L-shaped step resonators, and the frequency selectivity and out-of-band rejection are improved.

This disclosure provides a filter and a multiplexer including the same. The filter according to this disclosure includes: at least one series resonator unit connected in series between an input node and an output node, comprising a series resonator or comprising a series resonator and an inductor and / or capacitor connected in parallel or in series therewith; and at least one parallel resonator unit connected in parallel between a connection node and a ground node, comprising a parallel resonator or comprising a parallel resonator and an inductor and / or capacitor connected in parallel or in series therewith, the connection node being a node at the input and / or output of at least one series resonator unit and / or at least one parallel resonator unit being a composite resonator comprising a resonator. The filter according to this disclosure and the multiplexer including the filter can form more out-of-band transmission zeros in the filter's frequency response curve, thereby enhancing out-of-band attenuation.

This invention relates to the field of dual-passband filter technology and discloses an ultra-narrowband high-temperature superconducting symmetrical dual-channel filter. The invention establishes a high-order coupled topology based on CT and CQ units, enabling free adjustment of the zero positions between the two sub-passbands and the introduction of a pair of transmission zeros out of the dual-passband filter, thus achieving good sideband suppression between sub-passbands and throughout the entire dual-passband filter.

The invention discloses a lumped element and acoustic resonator mixed filtering balun and radio frequency front end system, which comprises a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module, and is characterized in that the first module, the third module and the fourth module are acoustic-electric mixed modules and comprise lumped elements and acoustic resonators; the first module, the fifth module, the sixth module and the seventh module are used for forming a plurality of transmission zero points outside a passband of the filtering balun so as to enhance the selectivity and out-of-band rejection of the edge of the passband, and the second module, the fifth module, the sixth module and the seventh module are electric modules, are formed by lumped elements and are used for realizing the passband of the required filtering balun. Reflection loss caused by impedance mismatching when discrete devices are cascaded can be avoided, insertion loss of a system is remarkably reduced, the size and cost of the system are reduced, the broadband advantage of an electrical filter and the high selectivity advantage of an acoustic filter are integrated, and meanwhile the high-performance filtering balun which is miniaturized, large in bandwidth and high in selectivity is achieved.

The application discloses a resonator, filter and multiplexer. The resonator comprises at least one LC resonant unit and at least one embedded resonant unit; the at least one LC resonant unit comprises at least one resonant element, the at least one resonant element comprises a first part, a second part and an interface between the two, and the interface connects the first part and the second part; the embedded resonant unit is embeddedly connected with the LC resonant unit through the interface. The application not only enables the LC resonant unit and the embedded unit to simultaneously filter the input signal, thereby ensuring the filtering performance of the resonator, but also enables the elements in the embedded resonant unit and the elements in the LC resonant unit to form a new resonant unit, and the input signal is filtered through the new filter unit, thereby not only improving the filtering effect of the resonator, but also increasing the signal transmission zero point of the filter, and further improving the filtering performance of the filter.

An antenna, antenna module, and electronic device. An antenna includes a first dielectric layer, a second dielectric layer, and a third dielectric layer. The second dielectric layer and the third dielectric layer are disposed on a same side of the first dielectric layer. The second dielectric layer and the third dielectric layer are disposed at different layers. A first radiating element is disposed at the first dielectric layer. A feed line is disposed at the second dielectric layer which feeds the first radiating element. A split resonance unit is disposed at the third dielectric layer, and in signal connection with the feed line. The split resonance unit is disposed on an input port of the antenna. In response to the split resonance unit operating on a resonant frequency thereof, the split resonance unit generates a transmission zero near the resonant frequency of the split resonance unit.

The invention provides a dual-passband waveguide filter and a coupling topology thereof, the dual-passband waveguide filter comprises a metal structure, the interior of the metal structure comprises a torispherical cavity and two sections of feed waveguides, the torispherical cavity is divided into four quarter-spherical cavities by partition plate structures, and the quarter-spherical cavities are communicated with the feed waveguides. Every two adjacent quarter spherical cavities are in coupling connection through a coupling window, and the two feed waveguides are respectively in coupling connection with the two opposite quarter spherical cavities through coupling windows. The dual-passband waveguide filter coupling topology comprises a cellular structure with a resonant node and a non-resonant node, a metal structure is in a physical presentation form of the cellular structure, a quarter spherical cavity is the resonant node, a feed waveguide is the non-resonant node, and the metal structure is a metal structure. According to the coupling topology theory, dual-passband band-pass filtering response of any even order can be realized, and limited transmission zeros are introduced into the lower stop band and the upper stop band of the two passbands at the same time, so that the stop band performance of the dual-passband band-pass filtering response is improved.

The invention relates to the technical field of radio frequency devices, in particular to an amplitude limiter circuit structure integrated with a filtering function by a gallium arsenide process, and the circuit sequentially comprises a 50-ohm microstrip input matching section, a first-stage amplitude limiting filtering unit, a second-stage amplitude limiting filtering unit and an output matching section along a main transmission line, in the first stage, three forward PIN diodes and three reverse PIN diodes are stacked and connected to a main circuit in parallel, high power tolerance and symmetrical amplitude limiting capacity are achieved, and two low-frequency transmission zero points are formed by fusing a micro-strip grounding branch knot and an MIM capacitor resonator; in the second stage, two anti-parallel PIN diodes are matched with a grounding inductor to form a third transmission zero point, three groups of resonant structures are integrated, six transmission zero points are introduced, the filtering performance in a 12-18GHz frequency band is remarkably enhanced, a PIN diode parasitic capacitor and a microstrip inductive structure are skillfully utilized by the circuit to cooperatively realize filtering, extra passive elements are not needed, and the cost is low. The method is suitable for integrated protection of sensitive devices in a high-frequency radar and communication system.

The invention provides a third harmonic suppression film microstrip filter based on a mixed structure. Comprising a substrate, a pair of coplanar waveguide feeder lines used for being connected with an external circuit and playing a role in impedance matching, and a plurality of interdigital resonators used for generating passband characteristics of the filter, the hairpin resonator is used for generating a transmission zero point at the low end of the filter to improve low-end stop-band suppression, the 1 / 4 wavelength open-circuit lines are used for suppressing third harmonics of the filter, and the pair of coplanar waveguide feeder lines, the interdigital resonators, the hairpin resonator and the 1 / 4 wavelength open-circuit lines are all laid on the substrate. The plurality of interdigital resonators are located between the pair of coplanar waveguide feeders, the hairpin resonator is located between the plurality of interdigital resonators, the pair of coplanar waveguide feeders is connected with the interdigital resonators at two sides of the plurality of interdigital resonators, and the plurality of 1 / 4 wavelength open-circuit lines are connected with the pair of coplanar waveguide feeders in parallel.

This invention discloses a miniaturized, highly selective bandpass filter chip for multipath transmission, comprising an input port, an output port, a port matching network, five octagonal inductors (L1~L5), seven MIM capacitors (C1~C7), and one ground inductor Ls1. It includes a conventional filtering path (Path A) and a compact coupling path (Path B) connected in parallel between the input and output ports. The port matching network is composed of capacitors C4 and C7. Path A forms three resonant units by connecting capacitors C1~C3 in parallel with inductors L1~L3, which, together with capacitor C5, inductor L4, and ground inductor Ls1, constitute a basic bandpass structure and generate low-frequency transmission zeros. Path B forms a compact coupling network by connecting symmetrically coupled inductor L5 in parallel with capacitor C6, utilizing mutual inductance coupling to generate additional high-frequency transmission zeros. The filter chip is implemented using GaAs-based IPD technology to achieve fully lumped component integration, possessing advantages such as compact structure, high selectivity, stable performance, and high integration density.

This invention discloses a bandpass frequency-selective surface structure based on strongly coupled pairs, composed of multiple basic structural units. Each basic structural unit has a vertically symmetrical structure along its thickness direction. Both the upper and lower symmetrical portions include a first metal layer and a first dielectric layer in symmetrical positions. The first metal layer contains a first resonator pair, a second resonator pair, and a third resonator pair, each using metal patches as resonators. A second metal layer and a second dielectric layer, separated along the thickness direction of the basic structural unit and in asymmetrical positions, are disposed between the upper and lower symmetrical portions. The upper and lower symmetrical portions are connected by metal conductive posts. This invention operates stably at a center frequency of 5 GHz, introduces four transmission zeros, achieves a fourth-order frequency response within 8.4% of the relative bandwidth, has an insertion loss of less than 0.49 dB, and 40° angular stability, exhibiting superior performance.

This invention discloses a linear multi-zero cavity duplexer based on a hybrid resonator. The duplexer comprises a rectangular hollow metal cavity, a common signal terminal at the top of the cavity, and two signal branches on either side. The branches employ a hybrid cascaded structure of single-mode and dual-mode metal resonators, forming a linear topology without cross-coupling. The dual-mode metal resonator can operate simultaneously in inter-plate coupling mode and coaxial mode. The resonant mode order is set by pre-setting the internal inter-plate distance, allowing each branch to generate two preset transmission zeros. This invention achieves a six-pole filtering response using only four resonant cavities, forming a dual passband and generating four preset transmission zeros, ensuring high quality factor and high channel isolation while achieving device miniaturization. This invention features a simple structure, easy fabrication, and independently and precisely adjustable coupling parameters, making it suitable for 5G / 6G communication, emergency communication, and UAV-borne high-performance miniaturized RF front-end applications.

The novel low-pass notch filter comprises a dielectric substrate, a CPW part, a transition part and an SSPP transmission line part which are sequentially cascaded are arranged on the front face of the dielectric substrate, and six interdigital coupling structures are loaded on the back face of the dielectric substrate in an up-down symmetrical mode; the CPW part is connected with the microwave system; the transition part is used for converting the TEM wave of the CPW structure into the TM wave of the SSPP structure; the SSPP transmission line part comprises six novel SSPP transmission line units; according to the novel SSPP transmission line unit, two sides of a central transmission line are respectively provided with a group of symmetrical linear groove structures which are etched on a CPW grounding plate, a folding groove structure is loaded between each group of symmetrical linear groove structures, and the top end of each folding groove structure is aligned with the top end of each linear groove structure; the interdigital coupling structure is used for generating resonance at a specific frequency and generating a transmission zero point. By loading an interdigital coupling structure on the back surface of the filter, a communication signal at a specific frequency is radiated to a free space, and suppression of the signal at the specific frequency is realized.

The invention provides a high-suppression passive reconfigurable intermediate-frequency filter based on a GaAs process, which comprises a high-order reconfigurable low-pass filter unit and a high-order reconfigurable high-pass filter unit which are in cascade connection, and is characterized in that the high-order reconfigurable low-pass filter unit is designed based on a seven-order low-pass elliptic function prototype and comprises a series branch and a parallel branch; the parallel branch comprises an adjustable capacitor and an inductor connected in series, bandwidth mode switching is achieved by adjusting the position of a transmission zero point, a fixed LC resonance circuit is introduced into the series branch to generate a fixed transmission zero point, and out-of-band rejection is enhanced; the high-order reconfigurable high-pass filter unit is designed based on a seven-order high-pass elliptic function prototype and comprises a series capacitor and a parallel grounding branch, and the parallel grounding branch comprises an inductor and an adjustable capacitor which are connected in series and is used for introducing a transmission zero point of a low-frequency stop band. According to the scheme, low insertion loss is kept while bandwidth mode switching is achieved, and the far-end out-of-band rejection capacity is remarkably improved.

The invention relates to the technical field of communication equipment, and discloses a frequency hopping filter with a hopping transmission zero point, a hopping control method and communication equipment. At least one resonant inductor of an LC resonant circuit of the frequency hopping filter is connected with a radio frequency switch feedback capacitor array in parallel; the frequency of a transmission zero point at a higher harmonic of the frequency hopping filter is controlled by controlling the opening and closing of a channel where each feedback capacitor in the radio frequency switch feedback capacitor array is located, so that the frequency of the transmission zero point changes along with the center frequency of the frequency hopping filter; and finally, far-end suppression, relative bandwidth stability and frequency hopping accuracy in a wide frequency range are improved.

Embodiments of the present application provide a reference signal transmission method and a related device, the method comprising: transmitting a phase tracking reference signal (PTRS) according to first information, the first information comprising at least one of the following items: the number of PTRS resource units (REs), the number of non-zero power (NZP) PTRS REs, the number of zero power ZP PTRS REs, or the number of puncturing REs, the number of the puncturing REs being at least one of the number of the PTRS REs, the number of the NZP PTRS REs, the number of the puncturing REs being at least one of the number of the puncturing REs, and the number of the puncturing REs being at least one of the number of the NZP PTRS REs. Wherein the PTRS RE is used for bearing the PTRS, the NZP PTRS RS is used for bearing the NZP PTRS, the ZP PTRS RS is used for bearing the ZP PTRS, and the puncturing RE is used for not transmitting data or transmitting zero-power signals. In a process in which the communication device transmits the PTRS according to the first information, in addition to a PTRS RE or an NZP PTRS RE, a ZP PTRS RE or a puncturing RE is also considered. Therefore, the PTRS RE or the NZP PTRS RE can obtain the extra power from the ZP PTRS RE or the punching RE, and the phase noise estimation precision is ensured.

The invention discloses a band-pass filter based on a three-dimensional hybrid disturbance technology. The band-pass filter comprises a base body, a filter circuit, a mixed disturbance structure, an input port and an output port, and the filter circuit is arranged in the base body and comprises a first capacitor, a first inductor, a second inductor and a second capacitor which are sequentially connected between the input port and the output port in series. The filter circuit further comprises a first parallel arm and a second parallel arm which are connected between the first inductor and the second inductor in parallel, the first parallel arm comprises a third inductor and a third capacitor, the second parallel arm comprises a fourth inductor and a fourth capacitor, and one end of the mixed disturbance structure is connected between the input port and the first capacitor. The other end of the hybrid disturbance structure is grounded, and the hybrid disturbance structure is used for generating a transmission zero point in a stop band of the filter. The band-pass filter can generate a controllable transmission zero point in a stop band.

This invention discloses an ultrawide, high-efficiency inverse Class-F power amplifier based on an elliptic low-pass filter matching network. The gate DC bias network provides the gate bias voltage required for the power amplifier transistor to operate; the drain DC bias network provides the drain bias voltage required for the power amplifier transistor to operate; the input impedance matching network includes a microstrip line, a DC blocking capacitor, and an RC parallel circuit; the output impedance matching network includes a harmonic control network and an elliptic low-pass filter matching network. The harmonic control network selects two frequency points outside the passband for second harmonic control; the elliptic low-pass filter matching network is based on an improved sixth-order Chebyshev low-pass filter, generating two transmission zeros outside the operating frequency band to achieve the conversion from fundamental impedance to second harmonic impedance. This invention enables the power amplifier to achieve high efficiency and high gain within a bandwidth exceeding five harmonics.

The application discloses a kind of wide band low insertion loss high selectivity frequency selective surface and application.It includes several unit structures, unit structure includes main structure and longitudinal structure, main structure includes two layers of rotation symmetry, aperture type frequency selective surface screen interval parallel arrangement of the dielectric layer and metal layer, longitudinal structure includes vertical and auxiliary metal strip, vertical metal strip upper end penetrates the through groove of upper aperture type frequency selective surface screen and does not contact electrically connected;Vertical metal strip bottom is equipped with auxiliary metal strip, auxiliary metal strip is pasted on the upper surface of lower aperture type frequency selective surface screen dielectric layer.The application inserts transmission zero between stop band and passband by longitudinal structure, realizes the low loss and high selectivity of passband transmission response under dual polarization, effectively improves the isolation of multi-frequency antenna array, improves the antenna pattern deterioration problem caused by co-aperture antenna coupling, with the characteristics of wide band, high selectivity, low loss, low profile, simple structure.

The application provides a wideband balanced band-pass filter based on a stub-loaded resonator, and solves the problems of strong common-mode interference, narrow passband, low selectivity and large size. The filter comprises two U-shaped microstrip lines, an asymmetric first stepped impedance microstrip line and an asymmetric second stepped impedance microstrip line printed on the upper surface of a dielectric substrate, and a stepped impedance gap line and a rectangular gap line etched on a metal ground plate. A metal through hole penetrates through the whole substrate. The application separates common-mode and differential-mode by using a U-shaped microstrip-to-rectangular gap line structure, realizes good common-mode suppression, introduces a transmission zero point by using a path difference of an L-shaped rotary microstrip stub, and improves selectivity and reduces size. The application has the characteristics of super bandwidth, small size, high selectivity and good common-mode suppression, and is applied to the fields of electromagnetic microwave and radio frequency circuit and system.

This invention discloses a cross-shaped microstrip filter, belonging to the field of microwave RF passive device technology. The filter includes a dielectric substrate, an input microstrip line, an output microstrip line, two sets of series-arm resonant units, and two sets of parallel-arm resonant units. The series-arm resonant units are composed of microstrip inductors and interdigital capacitors connected in series, with the resonant frequency corresponding to the filter's center frequency. The parallel-arm resonant units are composed of microstrip inductors and surface-mount capacitors connected in series, generating low-frequency and high-frequency transmission zeros respectively. The four sets of resonant units converge at a common node to form a cross-shaped topology. This invention, through a modular cross-shaped architecture, allows direct mapping between the resonant units and the frequency response, simplifying debugging and increasing design efficiency. Modular cascading can achieve high-order filtering, significantly improving band-edge steepness and stopband suppression, making it suitable for microwave RF systems such as communication, radar, and satellite navigation.

The invention belongs to the technical field of band-pass filters, and discloses a wide-stop-band 5G frequency band LTCC filter based on a frequency-variable coupling technology, and the frequency-variable coupling technology is used in the design, and four transmission zeros are introduced in different frequency bands, namely, a near-end stop band and a far-end stop band; according to the LTCC band-pass filter, the transmission zeros generated on the two sides of the pass band improve the selectivity of the filter, two transmission zeros are introduced into the far-end stop band, the stop band bandwidth of the LTCC band-pass filter is improved, and the LTCC miniaturized filter with the large bandwidth and high selectivity of the pass band of 3-5 GHz and the ultra-wide stop band of 15 GHz is achieved for the N77 + N79 frequency band of the 5G application frequency band.

The application provides a frequency band reconfigurable high-isolation low-insertion-loss switch chip and a control method, which comprises a substrate material, GaNFET, a port transmission line, a matching transmission line, an open short stub, a ground via and the like, FET1-FET16 are field effect tubes and are used for realizing switch port switching; the drain, the source and the gate surface metal layer of the GaNFET die are used for connecting the die gate, the source and the drain to the surface metal circuit through ohmic contact to lead out corresponding electrodes; the ground via is used for realizing GaNFET source grounding; the port transmission line is used for realizing external connection of the internal circuit of the chip; the matching transmission lines are used for realizing impedance matching of each port to obtain good chip performance; the open short stub is used for realizing in-band transmission zero point of the multifunctional switch chip to realize amplitude suppression of the corresponding frequency band; the control signal is a GaNFET gate control signal and is used for realizing control of the on-off state of the corresponding FET. The application has the advantages of low insertion loss, miniaturization, high power bearing and low cost.

The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a design method of an asymmetric three-passband filter based on a frequency-variable coupling structure. According to the method, a frequency-dependent coupling structure is applied to the design of the asymmetric three-passband filter based on the REMEZ-like algorithm, and after a frequency-dependent coupling matrix corresponding to a topological structure is converted into a non-frequency-dependent coupling matrix, all unknown parameters of the frequency-dependent coupling matrix are optimized and solved through a constrained nonlinear minimization function; therefore, an original cross coupling path is eliminated; and the generated N-1 transmission zeros can be generated and independently controlled by the frequency-variable coupling structure, so that the topological structure of the filter is simplified, and the debugging complexity is reduced. The three-passband filter with different orders, return losses and bandwidths can be synthesized in different passbands and specified transmission zero points, an in-line topological structure is achieved, the difficulty of filter design and simulation is lowered, and the degree of out-of-band rejection and isolation between the passbands is greatly improved.

The invention discloses an antenna, an antenna module and electronic equipment. The antenna comprises a first dielectric layer, a second dielectric layer and a third dielectric layer. Wherein the second dielectric layer and the third dielectric layer are arranged on the same side of the first dielectric layer, and the second dielectric layer and the third dielectric layer are arranged on different layers. The first dielectric layer is provided with a first radiation unit. The second dielectric layer is provided with a feed line, and the feed line feeds the first radiation unit. The third dielectric layer is provided with an opening resonance unit, and the opening resonance unit is in signal connection with the feeder line. According to the antenna, the opening resonance unit is arranged at the input port of the antenna, and when the opening resonance unit works at the resonance frequency of the opening resonance unit, the opening resonance unit can generate a transmission zero point near the resonance frequency point of the opening resonance unit. The stop band near the transmission zero point can suppress the signal. According to the antenna, the resonant frequency of the opening resonant unit can be set according to the out-of-band spurious frequency band, so that a transmission zero point is realized in the frequency band, a stop band is formed, and the out-of-band spurious of the antenna is suppressed.