112 results about "Artificial surface" patented technology

An artificial surface includes a substrate configured to support the artificial surface, a plurality of fibers formed integrally with and protruding upward from the substrate, wherein each of the plurality of fibers is individually molded. and a controller coupled to one or more of the plurality of fibers, wherein the controller is configured to control technology embedded in the one or more of the plurality of the fibers.

The invention belongs to the technical field of communication, and particularly relates to an ultra-wideband miniaturized Vivaldi antenna. The antenna comprises a dielectric substrate, wherein the upper surface of the dielectric substrate comprises a main body Vivaldi antenna, four resistors, two rectangular metal patches and an artificial surface plasma, wherein the main body Vivaldi antenna is provided with an exponential gradually-changed slot; a feed network is arranged on the lower surface and comprises six impedance conversion microstrip transmission lines, a fan-shaped transmission line and a circular groove; the main body antenna and the dielectric substrate are placed in a centered alignment manner, the four resistors are placed at the tail end of the main body antenna, and the rear sides of the resistors are connected with the two rectangular patches; the artificial surface plasma is placed in the main body antenna gradual change gap; and the multi-section impedance transformer and the microstrip-to-slot line structure of the feed network are aligned with the circular slot of the main body antenna. According to the invention, the ultra wide band, miniaturization and high radiation gain are realized by designing the main body antenna, slotting the edge, loading the resistor, carrying out the artificial surface plasma and the like. The working frequency band of the antenna ranges from 0.2 GHz to 18 GHz, and the antenna has the characteristic of miniaturization.

The invention discloses a multi-mode circularly polarized OAM (orbital angular momentum) filtering antenna based on an artificial surface plasmon. According to the antenna, the SSPP leaky-wave antenna and the HMSIPW filter are integrated, so that efficient emission of multi-mode OAM beams is realized, and the antenna has low axial ratio, high gain and good directional diagram matching performance; the SSPP leaky-wave antenna is composed of an Archimedes spiral line type SSPP waveguide and annularly distributed patches, wherein the SSPP waveguide realizes accurate regulation and control of dispersion characteristics through the combination of periodic sawtooth comb lines and uniform spiral lines; the HMSIPW filter is composed of a dielectric substrate layer, a metalized through hole and a gradient rectangular structure, impedance matching of a micro-strip and double lines is achieved, insertion loss is reduced, and radiation performance is improved. Compared with a traditional design, a filtering function is integrated, higher harmonic radiation and low-purity high-mode OAM are inhibited through the overall design, and selectivity and radiation energy uniformity are improved.

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 an artificial surface plasmon microstrip transmission line with a crosstalk suppression effect. The transmission line conduction band is provided with a periodic internal notch groove structure which is used for transmitting microwave artificial surface plasmons with strong local field constraint performance. The periodic notch grooves can be S-shaped, spiral, T-shaped, cross-shaped, KoCh-shaped, Moore Curve-shaped and other forms and are distributed in the microstrip conduction band, and the width of the conduction band is not increased, so that the remarkable inhibition effect that the far-end crosstalk is lower than-30dB is realized on the premise that the size of the microstrip line is not changed. The microstrip transmission line has the low-pass characteristic, the frequency response falling edge is steep, the cut-off frequency can be flexibly adjusted by adjusting the notch groove width and the number of iterations, and application requirements of different frequency bands can be met by scaling. The structure is simple, the size is compact, inter-line crosstalk can be effectively suppressed, the signal transmission quality is improved, the strict signal integrity requirement is met, and the high-frequency and high-speed signal transmission and functional devices are widely applied, and the wide application prospect is achieved.

The invention provides an output matching circuit and an amplifier. The output matching circuit comprises a T-shaped artificial surface plasmon structure. The T-shaped artificial surface plasmon structure comprises a filtering section and two transmission sections; the filtering section is provided with a first filtering unit, and the first filtering unit comprises a first groove and a first capacitor; and two ends of the first capacitor are respectively connected with two side surfaces of the first groove. According to the technical scheme, the problems that a harmonic suppression circuit in the prior art is high in power consumption and cannot flexibly cope with harmonic waves of various frequencies are solved, and therefore the harmonic suppression efficiency is improved.

The invention discloses a cell wide-spectrum detection method based on a terahertz artificial surface plasmon transmission line, and belongs to the field of cell wide-spectrum detection.The cell wide-spectrum detection method comprises the steps that the structure and size of the terahertz SSPP transmission line are designed, and a detection cavity packaged with the terahertz SSPP transmission line is prepared; connecting the detection chamber with a terahertz test platform, enabling the to-be-detected blood sample to flow into the detection chamber, and starting the test platform; the method comprises the following steps: irradiating an incident terahertz wave beam to the upper surface of a transmission line by using a high-resolution and large-dynamic terahertz frequency domain scanning test technology, efficiently coupling an incident terahertz free space wave with the transmission line, and exciting an SSPP wave with a high local characteristic on the surface of the transmission line; phase, amplitude and cut-off frequency data of an SSPP wave transmission spectrum are obtained, terahertz spectrum characteristics of cells are analyzed, and non-contact, unmarked and high-sensitivity detection and qualitative recognition of cell wide-spectrum information are achieved.

The present invention provides an artificial surface plasmon high-aperture efficiency end-fire antenna, which includes a dielectric substrate. The upper and lower surfaces of the dielectric substrate respectively form a dielectric substrate top layer and a dielectric substrate bottom layer. The dielectric substrate bottom layer is provided with a grounding metal layer, and the dielectric substrate top layer is provided with a top surface metal layer. The top surface metal layer is provided with a balun structure, a tapered parallel two-wire line, a transitional parallel two-wire line, and artificial surface plasmon radiation strips. One end of the balun structure is a feeding port, and the other end of the balun structure is connected to the end of the transitional parallel two-wire line through a connecting tapered parallel two-wire line. The other end of the transitional parallel two-wire line is connected to a pair of artificial surface plasmon radiation strips. This artificial surface plasmon high-aperture efficiency end-fire antenna has the advantages of high aperture efficiency, low profile, wide operating bandwidth, high directivity, high gain, and relatively small overall size.

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.

The utility model relates to the technical field of decorative plates, in particular to an artificial surface decorative plate with a good sound insulation effect, which comprises a main body mechanism, connecting mechanisms and a decorative mechanism, the connecting mechanisms are fixedly arranged at two ends of the main body mechanism, and the decorative mechanism is fixedly arranged at the top of the main body mechanism. The main body mechanism comprises a bottom plate, a first wear-resistant layer, a mothproof layer, a shock absorption layer, a sound insulation layer, a metal plate, a heat insulation layer, a waterproof layer and a second wear-resistant layer, the first wear-resistant layer is fixedly arranged on the surface of the side, not attached to the wall, of the bottom plate, and the mothproof layer is fixedly arranged at the bottom of the first wear-resistant layer. According to the artificial surface decorative plate with the good sound insulation effect, the sound insulation plate arranged at the bottom of the decorative plate plays a role in sound insulation for the first time, the sound insulation plate can cover the whole bottom plate, then the sound insulation layer in the bottom plate plays a role in sound insulation for the second time, and the sound insulation effect of the decorative plate is greatly improved through the double sound insulation arrangement.

The invention discloses a high-selectivity broadband cavity band-pass filter for low-orbit satellite communication and a manufacturing method, particularly relates to the technical field of communication, and solves the problems that in the prior art, due to the fact that periodic metal strips are loaded on a micro-strip transmission line and a substrate integrated waveguide, the structural loss is large; a periodic unit is loaded in a metal waveguide to form the characteristics that the lower stop band of the artificial surface plasmon is poor in selectivity and the metal waveguide is not flexible enough; and existing metal waveguide artificial surface plasmon polaritons cannot effectively achieve the purpose that the upper stop band is wide enough. According to the technical scheme, on the basis of an artificial surface plasmon polariton band-pass filter with an inverted-T-shaped groove etched in a center ridge, a pair of symmetrical folding groove structures is etched to form a 1 / 4 wavelength resonator, the 1 / 4 wavelength resonator is used for generating a zero point in a lower stop band, the selectivity of the band-pass filter is improved, and meanwhile the wide stop band characteristic is achieved by controlling the length of a grating; according to the invention, the loss is lower, and a wider stop band is realized.

The present invention discloses an artificial surface plasmon absorbing grid, method and air intake, which belong to the field of stealth technology of air intake system; the absorbing grid is composed of a plurality of square cavity unit arrays, the square cavity unit is a square ring cavity, and its circumferential wall surface is a multi-layer dielectric structure, and the wall surface is a frequency selective surface FSS, a synthetic resin PR, and a polyester resin PET from the inside to the outside, and each layer is placed in parallel; wherein the polyester resin PET of adjacent square cavity units is bonded by an indium tin oxide ITO film to form an artificial surface plasmon absorbing grid. The purpose of the present invention is to change the electromagnetic scattering characteristics of the air intake, reduce its radar scattering cross-sectional area, and thus improve the radar stealth performance of the aircraft.

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 present invention provides a terahertz broadband high-sensitivity sensor chip based on local field enhancement and a manufacturing method thereof, which includes a Vivaldi antenna, an artificial surface plasmon waveguide with a metal groove structure, a terahertz wave is input through an input end waveguide, and the Vivaldi antenna at one end couples the terahertz wave to the artificial surface plasmon waveguide, and the terahertz wave is transmitted in the waveguide under the constraint of the artificial surface plasmon waveguide, and the terahertz wave on the waveguide is coupled back to the free space by the Vivaldi antenna at the other end and is received by the terahertz detector; a circular metal area is provided at the inner edge of the artificial surface plasmon waveguide to increase the effective working bandwidth of the sensor chip. The present invention has high sensing sensitivity and high effective working bandwidth, can reduce reflection, and improve coupling efficiency, thereby solving the resonance peak generated by the metamaterial sensor due to its special structural design, has a simple preparation process, and has low equipment price, and can be applied on a large scale.

The invention belongs to the technical field of antennas, and relates to a multiband antenna based on artificial surface plasmon, which comprises a dielectric substrate, a radiation patch arranged on the upper surface of the dielectric substrate and a microstrip line arranged on the lower surface of the dielectric substrate, the radiation patch is provided with a radiation cavity and an axisymmetric radiation groove connected with the radiation cavity, so that an arc-shaped gradually-changed radiation arm of the Vivaldi antenna is formed. A plurality of first grooves are formed in the arc-shaped edges of the radiation arms; the first groove comprises first parts and second parts which are alternately arranged; the length of each first part is larger than that of the two adjacent second parts, and the length of each second part is smaller than that of the two adjacent first parts; the distances between all the first parts and the long edge of the dielectric substrate are equal, and the distances between all the second parts and the long edge of the dielectric substrate are equal; the first groove forms an artificial surface plasmon structure so as to realize multiband. According to the invention, multiband can be realized based on the artificial surface plasmon.

The invention discloses a high-gain end-on-fire antenna based on phase reversal artificial surface plasmon, which belongs to the field of antennae and comprises a dielectric substrate, and a first metal layer and a second metal layer are arranged on the upper surface and the lower surface of the dielectric substrate respectively. Each of the first metal layer and the second metal layer comprises a feed transition structure, a phase reversal artificial surface plasmon transmission line and a gradual transition structure which are connected in sequence; the phase reversal artificial surface plasmon transmission line comprises a first U-shaped unit, a first phase reversal unit, a second U-shaped unit and a second phase reversal unit which are connected in sequence and are periodically distributed, and the opening direction of the first U-shaped unit is opposite to the opening direction of the second U-shaped unit; the first phase inversion unit and the second phase inversion unit are used for generating 180-degree phase delay; the projection of the first metal layer on the lower surface of the dielectric substrate and the second metal layer are of a symmetrical structure, so that the gain of the antenna can be improved.

The invention discloses an artificial surface plasmon-based dual-mode oscillator, which comprises a resonance unit, a switching circuit and a differential circuit, and is characterized in that the resonance unit comprises a first metal ring and a second metal ring which are concentric, the inner ring of the first metal ring is connected with a plurality of first metal grid bars facing the second metal ring, and the inner ring of the second metal ring is connected with a plurality of second metal grid bars facing the second metal ring; a plurality of first metal grid bars facing the first metal ring are connected to the outer ring of the first metal ring, a plurality of second metal grid bars facing the first metal ring are connected to the outer ring of the second metal ring, the first metal grid bars and the second metal grid bars are arranged at intervals, a first notch is formed in the first metal ring, a second notch is formed in the position, corresponding to the first notch, of the second metal ring, and a third notch is formed in the position, 180 degrees away from the second notch, of the second metal ring. The two ends of the differential circuit are connected with the two ends of the first gap respectively and used for outputting differential excitation signals, and the two ends of the switching circuit are connected with the two ends of the third gap respectively and used for achieving the switching function, so that the modes of the dual-mode oscillator are switched. The invention has the advantages of wide frequency modulation range and low phase noise, and can be realized on a chip.

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 artificial surface plasmon circuit structure supporting odd mode and even mode transmission. The circuit structure comprises a dielectric substrate and metal structures on the upper layer and the lower layer of the dielectric substrate. The circuit structure comprises a feed structure, a transition section and an artificial surface plasmon transmission line structure, wherein the feed structure consists of a directional coupler, a phase shifter and a microstrip line; the transition section is designed for realizing mode conversion; in the circuit structure, odd-mode or even-mode transmission can be simply controlled by changing an input port. According to the artificial surface plasmon circuit structure supporting odd mode and even mode transmission, odd modes or even modes can be transmitted on the basis of not changing any circuit structure, the circuit structure is simple, operation is convenient, and the artificial surface plasmon circuit structure has good application prospects in modern communication systems.

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 present invention provides a beam reconfigurable antenna based on artificial surface plasmon polaritons and a wireless communication system in the technical field of reconfigurable antennas, including a dielectric substrate, a metal ground, a reconfigurable feeding network, and an antenna radiation body. The metal ground and the antenna radiation body are connected to the dielectric substrate, and the reconfigurable feeding network is located at one end of the antenna radiation body. By controlling the input voltage of the RF port, the bias state of the PIN diodes in the reconfigurable feeding network can be controlled, so as to adjust the feeding mode of the antenna radiation body, thereby realizing the conversion of the working mode of the antenna radiation body, that is, the antenna can be switched between a horizontal beam and a vertical beam. The present invention realizes the beam reconfigurable performance of the SSPPs antenna, and at the same time maintains the beam stability and high gain of the antenna in each mode within the working frequency band. The antenna has the advantages of simple structure, low cost, stable performance, and can be widely applied in wireless communication, etc.

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.