62 results about "Artificial surface" patented technology

The invention provides an on-chip terahertz band-pass filter based on an artificial surface plasmon high-order mode, and the on-chip terahertz band-pass filter comprises a dielectric substrate, a feed microstrip line, a first transition structure, a short-branch artificial surface plasmon transmission region, a second transition structure, and a long-branch artificial surface plasmon transmission region. Feed microstrip lines are arranged at the two ends of the front face of the dielectric substrate respectively, each feed microstrip line is sequentially connected with a first transition structure, a short-branch artificial surface plasmon transmission area and a second transition structure, and a long-branch artificial surface plasmon transmission area is located in the middle of the front face of the dielectric substrate. Two ends of the long branch artificial surface plasmon transmission region are respectively connected with a second transition structure, and the whole back surface of the dielectric substrate is covered with a metal layer as a metal ground; the wide-stop-band microstrip antenna has the advantages of being wide in stop band, easy to machine, small in transmission loss and small in crosstalk, does not need punching operation, and is convenient to machine.

The invention discloses a band-pass filter based on an artificial surface plasmon polariton structure and a design method thereof, a metal structure of the band-pass filter comprises an polariton structure region, the polariton structure region is provided with a plurality of plasmon polariton grooves, and the plurality of plasmon polariton grooves are arranged at intervals along a first direction; the depth direction of the plasmon polariton grooves is perpendicular to the first direction, the lengths and the widths of the plasmon polariton grooves are the same, and the multiple plasmon polariton grooves are formed in the same side of the polariton structure; the split resonant rings are arranged on the dielectric substrate, and the multiple split resonant rings are arranged close to the metal structure. Due to the fact that the multiple plasmon polariton grooves formed in the polariton structure and arranged at intervals in the first direction can form the artificial surface plasmon polariton structure, the band-pass filter based on the artificial surface plasmon polariton structure has the high inhibition capacity for harmonic waves of the band-pass frequency, and the band-pass filter based on the artificial surface plasmon polariton structure has the good inhibition capacity for the harmonic waves of the band-pass frequency.

This invention provides an artificial surface plasmon full-space beam scanning leaky antenna, comprising a dielectric substrate. The upper and lower surfaces of the dielectric substrate form a top layer and a bottom layer, respectively. The top layer of the dielectric substrate has a balun structure, an artificial surface plasmon strip group, and several metal stubs. Balun structures are symmetrically arranged at both ends of the artificial surface plasmon strip group. Several metal stubs are periodically arranged and symmetrically arranged on the upper and lower sides of the artificial surface plasmon strip group. The artificial surface plasmon strip group includes a pair of slidingly symmetrical artificial surface plasmon strips. This invention enables continuous scanning of the main beam from back-firing to front-firing, possessing full-space beam scanning capability. It has advantages such as small bandwidth occupation, high radiation efficiency, high directivity, high gain, low profile, and relatively small overall size, and can be applied in wireless communication fields such as automotive radar.

This invention relates to a pattern-reconfigurable antenna based on artificial surface plasmon polaritons (SSPPs), belonging to the field of antenna technology. The antenna includes a coplanar waveguide feed line, a transition structure, a reconfigurable SSPP waveguide, and periodic radiating elements. The reconfigurable SSPP waveguide modifies the dispersion characteristics by adding a varactor diode to a traditional SSPP element and adjusting the capacitance value using a bias circuit. The periodic radiating elements are elliptical patches with rectangular slots, coupled to the reconfigurable SSPP waveguide to radiate electromagnetic waves. This invention solves the problems of single radiation direction in traditional antennas and low gain in existing reconfigurable antennas. It achieves fixed-frequency beam scanning (maximum 23°) and frequency beam scanning (maximum 90°) in the 11.5GHz-15GHz frequency band, with gains greater than 9dBi (maximum 11.1dBi), expanding the detection range and increasing the detection distance, making it suitable for fields such as UAV detection.

The present invention discloses an active, adjustable low-pass and bandpass switchable artificial surface plasmon filter, comprising a first dielectric plate, a second dielectric plate, and a metal ground between the two. A first metal layer is provided on the front surface of the first dielectric plate, on which a tunable artificial surface plasmon unit is etched. A transition unit and a feeding structure are symmetrically connected at both ends of the tunable artificial surface plasmon unit. The feeding structure is used to connect the signal to be filtered and is connected to the tunable artificial surface plasmon unit through the transition unit. The present invention can switch the artificial surface plasmon filter between low-pass and bandpass effects, adjusting the upper cutoff frequency of the low-pass artificial surface plasmon filter and separately adjusting the upper and lower cutoff frequencies of the bandpass artificial surface plasmon filter.

The invention discloses a millimeter wave branch waveguide directional coupler based on artificial surface plasmon, which belongs to the technical field of millimeter wave devices and specifically comprises an input port, a straight-through port, a coupling port, an isolation port, a multi-branch waveguide and a matched load structure. The matched load structure extends into the slots in the centers of the E surfaces on the two sides of the isolation port; the input port is connected to the straight-through port through a main waveguide with a 90-degree outer side fillet, and the isolation port is connected to the coupling port through an auxiliary waveguide with a 90-degree outer side fillet; the multi-branch waveguide is arranged between the main waveguide and the auxiliary waveguide; the matched load structure comprises a load substrate, and an artificial surface plasmon and a multi-stage gradient sawtooth groove structure which are located on the surface of the load substrate. According to the invention, the matching load structures are arranged at the central slots of the E surfaces at the two sides of the isolation port, the isolation degree of the output port is improved, and the matching load structures are not influenced by the lossy wave-absorbing material and the relatively low working temperature of the thin-film resistor by using the excellent heat-conducting property of aluminum nitride and the high temperature resistance of metallic nickel.

The invention discloses an optical transparent ultra-wide-angle microwave absorber based on a two-dimensional and three-dimensional mixed structure, which comprises a two-dimensional structure, a three-dimensional structure and a floor, and is characterized in that the two-dimensional structure is composed of windmill-shaped ITO transparent conductive film glass, a first PET layer and a first PMMA layer; the three-dimensional structure is composed of two wave absorbers based on resonance and two wave absorbers based on artificial surface polaritons; the two wave absorbers based on resonance are different in size and resistance value of printing sheet resistance, and the two wave absorbers based on artificial surface polaritons are different in size and resistance value of printing sheet resistance; the floor is composed of square ITO transparent conductive film glass, a second PET layer and a second PMMA layer. The optical transparent wave absorber with the ultra-wide-angle wave absorption function is achieved, the electromagnetic stealth problem under the double-station radar detection technology is solved, and higher-performance stealth and strong enemy defense can be assisted.

The application provides a miniaturized laminated antenna based on artificial surface plasmon structure, comprising a first dielectric plate, a second dielectric plate, a first metal patch, a second metal patch, a metal ground and a feeding structure for feeding the laminated antenna, the first metal patch is arranged on the upper surface of the first dielectric plate, the second metal patch is arranged on the upper surface of the second dielectric plate, the metal ground is arranged on the lower surface of the second dielectric plate, the first metal patch and the second metal patch are both radiation units, and the non-radiation edges of the first metal patch and the second metal patch are both provided with artificial surface plasmon structure. The application realizes the miniaturized design of the laminated antenna, and significantly reduces the geometric size of the antenna while ensuring the wideband characteristics of the antenna.

The application relates to a polarization reconfigurable antenna based on a substrate integrated waveguide and an artificial surface plasmon, and belongs to the technical field of antennas. The application aims to solve the problems of fixed polarization characteristics of a traditional antenna, low gain of an existing polarization reconfigurable antenna, and limited beam scanning angle of a leaky-wave antenna. The antenna comprises two groups of 45-degree linear polarization antenna units (SSPP units constructed based on a SIW resonant cavity and a periodic 45-degree rectangular slot) arranged orthogonally and a power divider with a 90-degree phase difference. The power divider is selectively driven to work by controlling the switching state of PIN diodes. By controlling the state of the diodes, dynamic switching of +45-degree linear polarization, -45-degree linear polarization and right-handed circular polarization can be realized. Meanwhile, the antenna has high gain (up to 14.7dBi) and a beam scanning capability of about 43 degrees within a frequency range of 11.5-14.5GHz, and is suitable for wireless communication, radar systems and unmanned aerial vehicle detection.

The invention provides a leaky-wave antenna unit and an antenna device, and belongs to the technical field of antennae, and the leaky-wave antenna unit comprises a dielectric substrate which comprises a first side and a second side opposite to the first side; the artificial surface plasmon polariton (SSPP) structure comprises a transmission line located on the first side and a metal layer located on the second side, the metal layer is configured to be grounded, and the transmission line is configured to be connected with a feed part; wherein the transmission line is provided with a plurality of holes arranged periodically, the metal layer is provided with at least one defect groove penetrating through the metal layer, and the orthographic projection of the defect groove on the dielectric substrate is overlapped with the orthographic projection of the holes on the dielectric substrate.

The invention provides an on-chip Vivaldi end-on-fire antenna based on artificial surface plasmon, which comprises a dielectric substrate, the top layer of the dielectric substrate is provided with a microstrip line feed structure, a Balun structure, a Balun-radiator transition structure and an antenna radiator, the microstrip line feed structure is connected with the Balun structure, and the antenna radiator is connected with the Balun structure. The Balun structure comprises a long winding transmission line and a short winding transmission line, the long winding transmission line and the short winding transmission line are respectively connected with the symmetrically arranged Balun-radiator transition structures, the Balun-radiator transition structures are respectively connected with the antenna radiator, the antenna radiator comprises a Vivaldi radiator and an artificial surface plasmon structure, and the artificial surface plasmon structure is connected with the antenna radiator. The artificial surface plasmon structure is arranged on the Vivaldi radiator, and the Vivaldi radiator comprises a right trapezoid flaring part and a rectangular guide part; compared with other on-chip antennas, the on-chip Vivaldi end-on-fire antenna based on the artificial surface plasmon has the advantages that the loss is smaller, the radiation efficiency is higher, and the gain is higher.

The invention relates to a small broadband microwave anechoic chamber based on a non-uniform artificial surface, the small broadband microwave anechoic chamber comprises a 36-polygon cylindrical shell, a broadband artificial medium wave-absorbing unit and a transmitting antenna, the broadband artificial medium wave-absorbing unit is attached to the inner wall of the 36-polygon cylindrical shell, edges are uniformly arranged on the 36-polygon cylindrical shell at intervals along the perimeter direction of the outer side of the 36-polygon cylindrical shell, and the transmitting antenna is arranged on the outer side of the 36-polygon cylindrical shell. A transmitting antenna is attached between every two adjacent edges, and the transmitting antennas are microstrip patch antennas. The broadband artificial medium wave-absorbing unit can effectively absorb 8-12 GHz electromagnetic waves incident at 0-70 degrees, has the advantages of multiple angles, broadband and high absorptivity, and provides a high-quality low-reflection test environment for scenes such as antenna measurement and microwave imaging which have strict requirements on the electromagnetic environment; the device is small in size, compact in structure and easy to install and integrate, the used materials are common materials, large-scale expansion is easy, and the device has the advantages of being passive, easy to machine and low in cost.

The invention relates to a directional diagram reconfigurable antenna based on artificial surface plasmon polaritons, and belongs to the technical field of antennas. The antenna comprises a coplanar waveguide feeder line, a transition structure, a reconfigurable SSPP waveguide and a periodic radiation unit. According to the reconfigurable SSPP waveguide, a variable capacitance diode is added on a traditional SSPP unit, and a bias circuit is matched to regulate and control a capacitance value so as to change dispersion characteristics; the periodic radiation unit is an elliptical patch with a rectangular slot, and is coupled with the reconfigurable SSPP waveguide to radiate electromagnetic waves. According to the reconfigurable antenna, the problems that a traditional antenna is single in radiation direction and an existing reconfigurable antenna is low in gain are solved, fixed-frequency beam scanning (23 degrees to the maximum) and frequency beam scanning (90 degrees to the maximum) are achieved within the frequency band of 11.5-15 GHz, the gain is larger than 9 dBi (11.1 dBi to the maximum), the detection range can be expanded, the detection distance can be increased, and the reconfigurable antenna is suitable for the fields of unmanned aerial vehicle detection and the like.

The utility model discloses an artificial surface plasmon filter, which belongs to the technical field of microwaves and comprises a ground layer, a dielectric plate A, an SSPP unit layer A, a dielectric plate B, an SSPP unit layer B, a dielectric plate C, an SSPP unit layer C and a half-mode substrate integrated waveguide which are sequentially arranged from bottom to top. A cylinder B is arranged between the SSPP unit layer A and the SSPP unit layer B. A cylinder C is arranged between the SSPP unit layer A and the SSPP unit layer C. The length of the SSPP unit layer B is smaller than that of the SSPP unit layer A. The half-mode substrate integrated waveguide comprises a metal sheet and thirteen cylinders A which are equal in height and radius. The upper surface of the dielectric plate C is provided with two microstrip lines, and the microstrip lines are connected with the metal plate. The size of the filter is reduced through the three-dimensional heterogeneous integration technology, the progressive frequency of an SSPP structure is greatly reduced, the field constraint effect is enhanced, and better performance can be achieved under the condition that the size is more compact.

The invention discloses a polarization reconfigurable circularly polarized antenna designed by using an artificial surface plasmon structure, which is etched on an upper metal layer of a single-layer dielectric plate, and comprises four rectangular radiation patches which are distributed in a central symmetry manner and respectively correspond to a first feed port, a second feed port, a third feed port and a fourth feed port; the two artificial surface plasmon structures are in a bent line shape, and the two ends of each artificial surface plasmon structure are electrically connected to the two adjacent rectangular radiation patches respectively, so that a phase delay path is formed between the adjacent feed ports; the one-to-four microstrip feed network comprises a main feed line and four branch feed lines led out from a node of the main feed line; the four radio frequency switches are respectively connected in series with the four branch feed lines and the four corresponding rectangular radiation patches; and by controlling the alternate connection and disconnection of two groups of diagonal switches in the four radio frequency switches, radio frequency signals are fed in through different feed ports and are transmitted through the artificial surface plasmon structure, so that phase delay is realized to output circularly polarized waves.

The invention relates to an artificial surface plasmon on-chip differential dual-mode transmission line based on Balun. The on-chip differential dual-mode transmission line comprises a differential dual-mode transmission line located in the middle, symmetrical Balun structures located at the two ends of the differential dual-mode transmission line and bonding pad structures located on the outer sides of the Balun structures. The differential dual-mode transmission line has three different structures which are respectively four metal strip lines which are parallel to each other and branch knots which are arranged among the metal strip lines. The four metal strip lines are parallel to one another; the cross-layer branch knots are positioned below the metal strip lines; the two pairs of parallel metal strip lines are distributed on different metal layers; and the branches are arranged between the metal lines on the same layer. Transmission of two pairs of differential artificial surface plasmon signals can be supported at the same time, and the differential artificial surface plasmon antenna is suitable for technologies of gallium arsenide, silicon nitride and other III-V chips, other chips, circuit boards and the like, and supports design of a terahertz wave band, a microwave band and a millimeter wave band.

The invention relates to the field of radio frequency and microwave engineering, and discloses a band-pass filter which comprises an upper layer metal substrate and a lower layer metal substrate which are parallel to each other and opposite to each other, and the upper layer metal substrate and the lower layer metal substrate are spaced from each other in the vertical direction. Metal square columns are symmetrically arranged on the two sides, in the width direction of the lower-layer metal substrate, of the face, facing the upper-layer metal substrate, of the lower-layer metal substrate, and the metal square columns on each side are arranged at intervals in the length direction of the lower-layer metal substrate. Two rows of metal rectangular columns which are arranged at intervals in the length direction of the lower-layer metal substrate are further arranged in the middle of the face, facing the upper-layer metal substrate, of the lower-layer metal substrate, and the two rows of metal rectangular columns are symmetrical in the width direction of the lower-layer metal substrate and are perpendicular to the upper-layer metal substrate in the length direction of the lower-layer metal substrate; the height of each row of metal rectangular columns is increased firstly, then is kept unchanged and then is reduced. The band-pass filter provided by the invention is low in loss and small in size, and the passband width can be flexibly tuned.

The application discloses a half-mode SSPPs substrate integrated waveguide filter and a satellite communication integrated circuit. The half-mode SSPPs substrate integrated waveguide filter comprises a dielectric substrate and a metal patch; the metal patch comprises a rectangular area and a strip area connected to two sides of the rectangular area; a plurality of slot units are arranged on a lower side of the rectangular area and periodically arranged along edges of the half-mode length direction as artificial surface plasmon transmission devices; wherein each slot unit has a meander-shaped slot. The application provides a new solution for effective constraint and propagation of high-order modes of SSPPs by using the meander-shaped slot arranged periodically to form a meander-shaped SSPPs structure. Meanwhile, the structure is embedded into a substrate integrated waveguide to form a band-pass filter response, compared with a traditional SSPPs substrate integrated waveguide structure, a larger high-frequency cutoff frequency adjustment range can be realized, and compared with a basic mode, the band-pass filter response has a wider bandwidth.

The invention discloses a tunable one-way and two-way microwave notch filter and a design method. The filter has one-way and two-way filtering functions. The structure of the device mainly comprises an artificial surface plasmon polariton planar waveguide and a ferrite yttrium iron garnet microwave resonator, a circular polarization spin polarization microwave field with a spin-momentum locking characteristic is generated at a specific position in the planar waveguide, a magneton mode generated in the microwave resonator and the spin polarization microwave field are subjected to spin selective coupling, and under the critical coupling condition, microwaves input in one direction are completely filtered after passing through magneton, and then are subjected to spin polarization. And the microwaves input in the other direction are completely transmitted, so that the unidirectional filtering function of the microwaves at a specific frequency is realized. And an additional microwave resonator is further loaded, and the bidirectional filtering function can be realized by expanding the experimental configuration. The invention does not need complex structural design and strict parameter regulation and control, and provides a simpler, more convenient and more flexible method to realize the multifunctional microwave notch filter.

The utility model provides an active electromagnetic wave absorption metasurface with reconfigurable frequency, which belongs to the field of reconfigurable artificial surfaces and comprises a plurality of unit structures which are periodically and tightly arranged, and each unit structure comprises a metal pattern layer, a first dielectric layer, a metal grounding layer, a second dielectric layer and a direct current wiring layer which are sequentially arranged from top to bottom. The metal pattern layer comprises two metal patches, the two metal patches are connected to the direct current wiring layer through metal through holes respectively, a variable capacitance diode is connected between the two metal patches, isolation holes are formed in the periphery of the metal through hole connected with an anode of the variable capacitance diode, and each unit structure adopts three metal layers and two dielectric layers. The unit structure is simple and easy to integrate to achieve large-scale expansion, the metal grounding layer serves as a grounding layer of the unit structure and also serves as a shielding layer of the direct-current wiring layer, the influence of a direct-current control line on the performance of the unit structure can be overcome, the unit structure consistency is good, and the absorption performance of the electromagnetic wave absorption metasurface is good.

The utility model discloses a low side lobe gap waveguide slot antenna based on artificial surface plasmon, which comprises a first metal layer and a second metal layer which are oppositely stacked, and a gap is arranged on the joint surface of the two metal layers. One end of the antenna is electrically connected to a first waveguide port having a receiving / transmitting signal, and the other end is connected to the radiation opening as a radiation / receiving end of a radio frequency signal. The antenna comprises a horizontal waveguide channel and a vertical waveguide channel, and a matching branch knot is arranged in the horizontal waveguide channel. And an artificial surface plasmon structure is arranged on the outer side of the side wall of the horizontal waveguide channel. According to the utility model, the artificial surface plasmon structure is arranged, so that when a gap exists between the first metal layer and the second metal layer, electromagnetic energy is bound around the artificial surface plasmon, thereby ensuring that the electromagnetic energy can be completely transmitted along an expected direction. The antenna scheme provided by the utility model has great advantages for assembly tolerance redundancy and cost control during mass production.

A modular foundation structure for artificial surface systems may include a plurality foundation sections. Each of the foundation section may comprise a structure base layer, an adhesive layer, and an impact and thermal protective layer. The adhesive layer may cover the structural base layer, and the impact and thermal protective layer may be attached to the structural base layer via the adhesive layer. The foundation sections may be provided as separate foundation sections that may be positionable to be attached to one another to form the modular foundation structure. The foundation sections may be attachable one another with a section adhesive. Embodiments may include a connection edge that may be positioned to surround and abut a perimeter of the modular foundation structure. Embodiments may also include an artificial surface layer that may be positioned to cover an upper surface area of the modular foundation structure.

The invention discloses a leaky-wave antenna based on an artificial surface plasmon supergrating. The leaky-wave antenna comprises a dielectric substrate, a radiator and a grounding plate, the radiator is arranged on one side of the dielectric substrate, the radiator is an ideal electric conductor, and a periodically modulated super grating structure is etched on the surface of the radiator; the grounding plate is arranged on the other side of the dielectric substrate, the grounding plate is an ideal electric conductor, and the periodically modulated super grating structure is etched on the surface of the grounding plate; the periodically modulated super grating structure is used for exciting an artificial surface plasmon mode and generating space harmonics, and controlling a phase constant of the artificial surface plasmon mode through frequency change, so that antenna radiation beams realize continuous scanning from end emission to side emission to back emission. Controllable radiation of SSPP leakage is achieved, meanwhile, the directivity of the antenna is further enhanced through the holographic patches around the radiation surface, side lobes are restrained, and miniaturization of the antenna is achieved.

The application discloses a planar vortex orbit angular momentum antenna based on artificial surface plasmons. The application comprises a resonant antenna and a feeding system; the resonant antenna comprises an artificial surface plasmon metal ring and a first dielectric plate; the feeding system comprises a second dielectric plate, an air dielectric layer, a metal ground, a third dielectric plate and a feeding network; two microstrip stubs are arranged on the third dielectric plate, and a small metal disc is arranged at the end of each microstrip stub; the microstrip stubs are connected with the feeding network through metal vias; the surface impedance of the slotted unit of each artificial surface plasmon unit in the artificial surface plasmon metal ring is the same or different. The application can emit a vortex wave beam carrying a precisely defined orbit angular momentum on a plane, and through synthesizing multiple wave beams at a fixed frequency, the multiple wave beams can be superimposed to form a new wave beam, so that the shape of the wave beam can be controlled. The wave beam scanning can be realized by adjusting the surface impedance distribution of each wave beam.

The invention discloses a phase shifter and an antenna, and relates to the technical field of phase shifters. The phase shifter comprises an artificial surface plasmon circuit structure, wherein the artificial surface plasmon circuit structure comprises an artificial surface plasmon waveguide; the medium disturbance element and the artificial surface plasmon waveguide are opposite to each other and are arranged at an interval; and the MEMS actuator is connected with the medium disturbance element, and the MEMS actuator is configured to drive the medium disturbance element to move relative to the artificial surface plasmon waveguide, so that the medium disturbance element interacts with the local electromagnetic field of the artificial surface plasmon waveguide. Through the characteristics of high-precision driving and low power consumption of the MEMS technology, the provided phase shifter has low insertion loss and a wide phase adjustment range.

The invention discloses an artificial surface plasmon structure sensor, a multi-mode sensing clamping jaw and application of the artificial surface plasmon structure sensor and the multi-mode sensing clamping jaw, and relates to the technical field of intelligent laboratory automation. The artificial surface plasmon substrate comprises a periodic slot unit, and a gradual transition section and a coplanar waveguide transmission end which are sequentially arranged at the two ends of the periodic slot unit from near to far, the coplanar waveguide transmission end is connected with coaxial cables, and the coaxial cables on the two sides are connected with a signal input end and a signal output end of external SDR equipment respectively; the SDR device inputs an excitation signal to the sensor and collects a response signal of the sensor. The device has the grabbing force control function and the substance recognition function, dangerous liquid centrifuge tubes can be safely grabbed and recognized under the completely unmanned intervention condition, the requirement for manual contact with harmful substances is greatly reduced, and the safety and the automation level of an intelligent laboratory in dangerous operation are improved.

The duplexer comprises an input structure, a first output structure, a second output structure, a first transmission structure and a second transmission structure, the first transmission structure is electrically connected between the input structure and the first output structure, the first transmission structure comprises a first artificial surface plasmon transmission line and a first split resonant ring, and the second transmission structure comprises a second artificial surface plasmon transmission line and a second split resonant ring. The first split-ring resonator is loaded on the first artificial surface plasmon transmission line to form a first band elimination filter together with the first artificial surface plasmon transmission line; the second transmission structure is electrically connected between the input structure and the second output structure, the second transmission structure comprises a second artificial surface plasmon transmission line and a second opening resonance ring, and the second opening resonance ring is loaded on the second artificial surface plasmon transmission line to jointly form a second band elimination filter. According to the technical scheme, the duplexer provided by the invention can effectively reduce the influence of crosstalk between the transmission lines, improve the signal transmission quality and reduce the loss.

The invention discloses a transparent orbital angular momentum antenna based on artificial surface plasmon. The transparent orbital angular momentum antenna comprises a linear SSPPs transmission line, an index-shaped transition coplanar waveguide, an Archimedes linear radiation patch and an ITO reflecting surface, the index-shaped transition coplanar waveguide is integrated at the feed end of the linear SSPP transmission line, the linear SSPP transmission line comprises a linear structure transmission line and an annular structure transmission line, the linear structure transmission line is connected with the annular structure transmission line, the Archimedes linear radiation patch is arranged on the inner side of the annular structure transmission line, and the Archimedes linear radiation patch is arranged on the outer side of the annular structure transmission line. A metal wire of the linear SSPPs transmission line is etched on the PET substrate through a photoetching process, and the ITO reflecting surface is fixed on the PET substrate. The transparent OAM antenna provided by the invention has a good optical transparency effect and a low profile, can solve the problems of huge equipment size and heavy structure, solves the problem that the OAM mode cannot be reconstructed, and improves the beam generation efficiency.

The invention provides a terahertz series-fed beam forming network antenna and a design method, and belongs to the technical field of antenna design, and the design method comprises the following steps: determining the size and position of a radiation slot based on a waveguide slot array, and introducing an artificial surface plasmon structure and an open stop band suppression structure; designing a series-fed beam forming network, and calculating the length of a waveguide transmission line to provide a required phase difference; the size parameters of the structures of all parts of the antenna are optimized, aperture field distribution of a target antenna is achieved, a series-fed beam forming network and an artificial surface plasmon structure are adopted, the design of the passive two-dimensional beam scanning antenna in the terahertz frequency band is achieved, and the antenna design method can be applied to beam scanning of any frequency band and has wide application prospects. Beam scanning of any two-dimensional space is designed, the designed antenna can achieve the beam scanning range of-25 degrees to 35 degrees and the beam scanning range of-50 degrees to 50 degrees on the plane of the pitch angle and the plane of the azimuth angle respectively, and the antenna is high in efficiency and compact in structure.

This invention discloses a bandwidth-controllable compact ridge waveguide cavity bandpass filter based on SSPP and its fabrication method. The device includes a cavity containing a ridge waveguide. Several inverted T-shaped grooves are etched at intervals on the ridge waveguide, forming a structure where the middle section is an artificial surface plasmon polariton (SSPP) and the left and right ends are transitional SSPP structures. The transitional SSPP structures at the left and right ends are respectively connected to horizontal coaxial connectors. Dual grating structures are respectively provided on both sides of the ridge waveguide within the cavity. This invention achieves a wideband bandpass structure of 7.6GHz–12.4GHz by integrating the ridge waveguide, SSPP, and dual gratings into a single cavity. It achieves a return loss below -16dB and an insertion loss of 0.23dB within the band. Low loss and small size are achieved within a 44.8% wideband, and the passband bandwidth can be flexibly tuned.