303 results about "Dielectric resonator" patented technology

The invention discloses a broadband low-coupling dual-polarization dielectric resonator antenna based on dual-mode resonance and differential feed. The broadband low-coupling dual-polarization dielectric resonator antenna comprises a dielectric resonator, two pairs of orthogonal coaxial probe pairs, a first Wilkinson power divider, a second Wilkinson power divider, a first feed port and a second feed port, the two pairs of orthogonal coaxial probes are both inserted into the dielectric resonator; each pair of coaxial probes is connected with two output ends of the corresponding Wilkinson power divider; the first feed port excites the pair of coaxial probes to feed the dielectric resonator through the first Wilkinson power divider, and excites a horizontal polarization radiation mode in the x-axis direction; a second feed port excites the other pair of coaxial probes to feed towards the dielectric resonator through a second Wilkinson power divider, and a horizontal polarization radiation mode in the y-axis direction is excited; according to the invention, a dual-polarization radiation mode which is compact in structure, broadband and low in coupling is realized, and each polarization further increases the bandwidth by exciting two resonance modes with close frequency points.

The invention relates to the technical field of filters, in particular to a dual-mode resonator and a dual-mode filter. The dual-mode resonator comprises a metal cavity and a medium resonance body; the number of the metal cavities is two, and the two metal cavities are arranged on the two opposite sides of the medium resonance body respectively. The opening end of the metal cavity faces one end of the dielectric resonator; a conducting ring is arranged between the metal cavity and the dielectric resonant body, and the metal cavity and the conducting ring form a resonant cavity. The dual-mode filter comprises a first resonator and a second resonator; the first resonator is a dual-mode resonator; the first resonator and the second resonator are connected in series through a coupling structure. The conducting rings and the metal cavities are arranged on the two opposite sides of the dielectric resonance body, the conducting rings and the metal cavities form the resonance cavities, and the dual-mode resonance effect is achieved. The overall size is small, the space utilization rate is high, and production is easy.

The embodiment of the invention provides a dielectric resonator, a dielectric filter and communication equipment, relates to the technical field of communication, and is used for improving the quality factor of the dielectric resonator. The dielectric resonator includes a first dielectric block, a second dielectric block, a first conductive layer, and a second conductive layer. The first dielectric block is provided with a mounting hole, and the second dielectric block is located in the mounting hole; the dielectric constant of the second dielectric block is greater than that of the first dielectric block. The first conductive layer is located on at least part of the surface, except the surface opposite to the second dielectric block, of the surface of the first dielectric block. The second conductive layer is located on at least part of the surface, except the surface opposite to the first dielectric block, of the surface of the second dielectric block; the second conductive layer is coupled to the first conductive layer. The dielectric resonator is applied to the dielectric filter, and the Q value of the dielectric filter is improved.

The invention relates to a dielectric filter and communication equipment, and the dielectric filter comprises at least two dielectric resonators which are connected with each other and a hole group, each dielectric resonator comprises a dielectric body and a resonant cavity, the dielectric body comprises a top surface and a bottom surface along a first direction of the dielectric filter, the resonant cavity penetrates through the top surface or the bottom surface, and the resonant cavity penetrates through the top surface or the bottom surface along a second direction of the dielectric filter. The dielectric body further comprises a first side face and a second side face, the hole sets are arranged between two adjacent dielectric resonators, each hole set comprises a first hole and a second hole, the two ends of the first hole penetrate through the top face and the bottom face respectively, the second hole penetrates through at least one of the first side face and the second side face, and the first side face and the second side face are arranged in the third direction of the dielectric filter. The projection of the first hole and the projection of the second hole are crossed, so that a magnetic field between two adjacent dielectric resonators is cut more sufficiently, the coupling strength between high-order modes of higher harmonics is reduced, the far-end suppression capability of the dielectric filter is improved, a low-pass filter does not need to be additionally arranged, and the cost and insertion loss are reduced.

The invention discloses a broadband circularly polarized substrate integrated dielectric resonator filter antenna, which is characterized in that structures such as an annular back cavity structure, an equivalent metal wall and a rectangular short patch act on a 3 * 3 rectangular dielectric sheet to form an annular back cavity substrate integrated dielectric resonator working in multiple modes; by inhibiting a cross polarization electric field and optimizing a main polarization electric field by the three, the gain fluctuation is effectively improved, the axial ratio bandwidth is broadened, the broadband circularly-polarized substrate integrated dielectric resonator filter antenna with stable gain is realized by combining the filtering effect of the E-type microstrip feed structure, and the substrate can be integrated and can give consideration to the profile and the size.

Metasurface optical components deposited on the surface of a substrate are used to alter incident light. The metasurface optical components comprise a pattern of silicon dielectric resonators that have nonperiodic gap distances between adjacent silicon dielectric resonators; and each silicon dielectric resonator is an elongated rectangular prism that has a width, a length, and a thickness. Incident light is directed to the metasurface optical components, wherein the gap distances, the widths, and the thicknesses are configured to scatter the incident light and impart a phase shift, ranging at least from 0 to 2π, on an outgoing light. Each dielectric resonator has a rectangular cross-section in a plane perpendicular to the substrate surface such that a first phase shift is imparted for a transverse-electric (TE) component of the incident light and a second phase shift is imparted for a transverse-magnetic (TM) component of the incident light.

The invention discloses a dual-passband filtering coupler based on a dielectric resonant cavity, particularly relates to the technical field of wireless communication, and solves the technical problems that in the prior art, a cavity filter and a cavity coupler often work in a cascade mode, and a matching network needs to be additionally configured between the cavity filter and the cavity coupler, so that the hardware cost is high, and the occupied system space is large. According to the technical scheme, the coupler and the dual-passband filter are integrated in one device, the circuit size can be remarkably reduced, and cascade loss between the coupler and the dual-passband filter is eliminated. The high-performance index of the microwave circuit is guaranteed, effective balance between performance and cost is achieved, and the microwave circuit completely conforms to the development direction of miniaturization, high performance and low cost of a future communication system.

An electronic device may have a first phased antenna array that radiates through a display and a second phased antenna array that radiates through a rear wall. The first array may include a front-facing dielectric resonator antenna and the second array may include a rear-facing dielectric resonator antenna. The front and rear-facing antennas may share a dielectric resonating element. Feed probe(s) may excite a first volume of the dielectric resonating element to radiate through the display and may excite a second volume of the dielectric resonating element to radiate through the rear wall. The dielectric resonating element may have a geometry that helps to isolate the front-facing dielectric resonator antenna from the rear-facing dielectric resonator antenna. The first and second arrays may collectively cover an entire sphere around the device while occupying a minimal amount of volume within the device.

A dielectric resonator antenna, which includes a dielectric resonator and a substrate on which a planar feeding circuit is configured. The dielectric resonator is located on a first side of the substrate. The planar feeding circuit contains a first feeding part and a second feeding part. The first and second feeding parts are adapted to excite two orthogonal DRA modes in a same frequency band. Due to its polarization diversity, the antenna can be used to replace two commercial Wi-Fi antennas. It can simultaneously be used as a projection device for decoration and advertising.

The invention belongs to the technical field of antennas, and relates to a dielectric resonator antenna, which comprises a bottom plate and a dielectric block arranged on the bottom plate, the dielectric block comprises a first part of a regular quadrangular frustum pyramid structure, and the lower bottom surface of the first part is arranged at the center of the bottom plate to form a dielectric resonator; the dielectric block further comprises a second part of a regular quadrangular frustum pyramid structure; the upper bottom surface of the second part is overlapped with the upper bottom surface of the first part; the side length of the lower bottom surface of the second part is larger than that of the first part, and the height of the second part is smaller than that of the first part; the lower bottom surface of the second part is provided with a resonant tank recessed towards the first part, and the resonant tank is of a cube structure. The antenna can be applied to the S wave band, and ultra wide band and light weight are realized at the same time.

The present application relates to the technical field of communications, and discloses a base station antenna unit, a base station antenna array, and a base station. The base station antenna unit comprises a dielectric plate, a metal ground plate, a first dielectric resonator, a second dielectric resonator, a dielectric coupling path, and a feeding structure; the metal ground plate and the feeding structure are arranged on two sides of the dielectric plate, respectively, and a cross-shaped slot is formed on the metal ground plate; the first dielectric resonator and the second dielectric resonator are of a symmetrical structure, and the first dielectric resonator and the second dielectric resonator are arranged on the dielectric plate; the dielectric coupling path is arranged on the dielectric plate, located between the first dielectric resonator and the second dielectric resonator, coupled to the first dielectric resonator and the second dielectric resonator, and located above the cross-shaped slot; and the feeding structure has two feeding ports, feeding input by means of different feeding ports excites the cross-shaped slot to generate an orthogonal electric field, and electromagnetic waves of the orthogonal electric field reach the first dielectric resonator and the second dielectric resonator by means of the dielectric coupling path.

The invention discloses a broadband low-profile circularly polarized dielectric resonator antenna. The antenna comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, wherein the first dielectric substrate is provided with a microstrip slot coupling feed unit; the dielectric resonator is arranged on the first dielectric substrate, four corners of the dielectric resonator are respectively provided with an angle block, and the angle blocks are arranged in a central symmetry manner by taking the center of the dielectric resonator as a symmetric center; second dielectric substrates are arranged on angle blocks of the dielectric resonators, and parasitic metal strips are arranged between the second dielectric substrates and the dielectric resonators. Through the combination of the feed coupling slot mode, the basic mode of the dielectric resonator and the third high-order mode, the impedance and the axial ratio bandwidth are effectively expanded. And through the parasitic metal strip and the selection of the aluminum oxide ceramic material without surface loss and the resonator structure, the gain is remarkably improved, the profile height of the antenna is reduced, and the radiation efficiency of the antenna is improved.

The invention belongs to the technical field of wireless medical equipment, and provides a high-gain capsule antenna used for a wireless capsule endoscope and applying a dielectric resonator, which is used for solving the problem that stable and high-quality communication between the wireless capsule endoscope in a human body and external receiving equipment is difficult to maintain by the existing wireless capsule endoscope. The antenna comprises a capsule shell 1, an antenna body 2 and a dielectric resonator 3, the antenna body and the dielectric resonator are both arranged in the capsule shell, the capsule shell is composed of a cylindrical tubular shell and hemispherical shells connected with the two ends of the cylindrical tubular shell, and the antenna body is arranged in parallel along the circular end face of the cylindrical tubular shell. The dielectric resonator is arranged above the antenna body and located in the hemispherical shell on the same side, a preset distance is kept between the dielectric resonator and the antenna body, and electromagnetic waves emitted by the dielectric resonator to the antenna body are converged. In conclusion, through the design of the dielectric resonator, the antenna gain can be greatly improved, so that the communication quality is improved.

A preparation method for a microwave dielectric resonator with a laminated structure is provided. The laminated structure of the microwave dielectric resonator is a three-layer structure of the top, middle, and bottom layers. A composition expression of the microwave dielectric resonator is y·ZnTi0.95Sc0.05Nb2O8-x·TiO2-y·ZnTi0.95Sc0.05Nb2O8, and a range of x is 0.03-0.05 grams, and y is (1−x) / 2 grams. The microwave dielectric resonator has good temperature stability while maintaining a moderate dielectric constant and a higher quality factor Qf.

The utility model is suitable for the technical field of communication, and provides a dielectric filter, which comprises a cavity, a cover plate covers the cavity and is provided with a deformation part, and the deformation part is provided with a first mounting hole in a penetrating manner along the thickness direction of the cover plate; the first end of the dielectric resonator is contacted with the deformation part, and the second end is contacted with the inner bottom surface of the cavity; the locking piece is arranged in the first mounting hole in a penetrating mode, the first end of the locking piece is connected to the deformation part, the second end of the locking piece is connected with the inner bottom face of the cavity, the locking piece is made of insulating materials, the first end of the locking piece is provided with a second mounting hole, and the tuning piece is movably arranged in the second mounting hole and at least partially located in the resonant cavity. According to the dielectric filter, the acting force is applied to the deformation part through the locking piece, so that the dielectric resonance piece is stably fixed in the cavity; and the tuning piece can be tuned without electromagnetic interference of the locking piece, and can be compatible with the locking piece in occupied space, so that miniaturization of the dielectric filter is facilitated.

A short-circuit rectangular metal patch and a dielectric slot act on a cavity-backed substrate integrated dielectric resonator, and by utilizing a newly-added mode of the short-circuit rectangular metal patch and a matching effect of the short-circuit rectangular metal patch and the dielectric slot on a slot mode and an adjusting effect of the short-circuit rectangular metal patch and the dielectric slot on amplitude distribution of an electric field of four modes, the broadband stable beam broadening dielectric resonator filtering antenna is obtained. By combining a low-frequency out-of-band radiation zero point generated by the whole resonator and a high-frequency out-of-band wave limiting effect of the U-shaped groove, the broadband wide-beam dielectric resonator antenna is realized, and the broadband wide-beam dielectric resonator antenna has the advantages of broadband stable beam broadening and integration of a filtering function, and can simultaneously take substrate integration and low profile into account.

Embodiments disclosed herein include dielectric resonators for microwave plasma application. In an embodiment, such an apparatus comprises a dielectric puck, where the dielectric puck has a cylindrical shape. In an embodiment, the dielectric puck comprises a first region with a first dielectric constant, and a second region with a second dielectric constant that is different than the first dielectric constant. In an embodiment, the dielectric puck further comprises a hole into a top surface of the dielectric puck.

The invention discloses a compact broadband low-coupling tri-polarization dielectric resonator antenna based on a non-uniform medium, a pair of orthogonal horizontal polarization TEx and TEy resonant modes is excited in the dielectric resonator antenna by utilizing differential feed, the frequency points of the TE111 and TE113 resonant modes of a dielectric resonator are adjusted to be close to each other, and the directional diagrams of the two modes are similar, so that the frequency points of the TE111 and TE113 resonant modes of the dielectric resonator are close to each other. The working bandwidth of the antenna is effectively improved; on the basis, a probe is inserted into the center of the dielectric resonator to excite a vertical polarization TM011 mode of the dielectric resonator, the working frequency bands of the three modes are highly overlapped, and the design of the broadband tri-polarization antenna is realized; meanwhile, the dielectric block with the dielectric constant higher than that of the original dielectric is embedded into the dielectric resonator, so that the working bandwidth of the antenna is increased; the annular gap is etched on the floor around the probe, so that the coupling among the ports is reduced; according to the invention, the tri-polarization common bandwidth reaches 47.7%, the size is 0.326 * 0.326 * 0.326 lambda03, and the bandwidth area ratio reaches 449% / lambda02.

The invention provides a broadband wide-beam dielectric resonator antenna, which belongs to the technical field of wireless communication and antennas and structurally comprises a dielectric resonator serving as a main antenna radiator, a dielectric substrate A, a metal floor, a dielectric substrate B, a metal microstrip line and a U-shaped metal cavity from top to bottom in sequence. The U-shaped metal cavity serves as a main element of the antenna for realizing a wide beam, is placed at the bottom of the antenna, and is used for introducing vertical current and horizontal current for supplementary radiation; and the metal floor is connected with the U-shaped metal cavity. According to the invention, the bandwidth of the dielectric resonator antenna is expanded through the mode of exciting and combining the grooves and the fundamental mode of the dielectric resonator; the U-shaped metal cavity is formed by bending the floor of the dielectric resonator antenna, so that the beam width of the antenna on the E surface and the H surface is widened. In a working frequency band, the beam widths of the two surfaces are both greater than 180 degrees, so that a radiation effect with stable wide beam characteristics in a relatively wide frequency band is realized; through a method of introducing a metal sheet on the floor, the high-frequency gain is improved while the beam width is maintained.

The invention discloses a wide-beam dielectric resonator antenna, which is characterized in that a high-dielectric-constant dielectric circular ring with a circular hole and a layer of metal circular ring are loaded above a high-dielectric-constant dielectric block structure, so that a TM11 mode of a dielectric resonator is coupled with a fundamental mode of a metal circular ring structure, and therefore, the wave beam width of the dielectric resonator antenna is expanded, and the dielectric resonator antenna has a wide wave beam range. And the purposes of small size and simple structure are achieved.

The invention belongs to the technical field of microwave communication, and particularly relates to a closely-arranged Z-type self-decoupling dielectric resonator antenna. Signals are coupled to top-layer high-dielectric-constant Z-type dielectric resonators through rectangular grooves, TM11 modes of the dielectric resonators are excited, the two top-layer high-dielectric-constant Z-type dielectric resonators are arranged back to back, the rectangular grooves are located under the dielectric resonators, and the dielectric resonators are transformed into Z types. The dielectric resonator antenna array is closely arranged and has a good isolation improvement effect, and the antenna has the advantages of low ECC, directional diagram recovery and the like. According to the invention, the TM11 mode of the top-layer high-dielectric-constant Z-type dielectric resonator is excited by using microstrip slot coupling feeding, the dielectric resonator antenna is tightly arranged, and compared with a traditional dielectric resonator antenna, the dielectric resonator antenna has the characteristics of low ECC, high isolation and the like.

This invention discloses a low-loss, temperature-stable microwave dielectric ceramic and its dielectric resonant antenna, belonging to the field of microwave dielectric ceramic technology. Addressing the technical problem that existing rock-salt structure microwave dielectric ceramics struggle to simultaneously achieve a near-zero resonant frequency temperature coefficient and a high quality factor, this invention provides a material with the chemical formula (1-x)Li. 2.5 Mg 2.5 Ti 0.5 Nb 0.5 O 12 A ceramic material of -xLi₂TiO₃, where 0.2 ≤ x ≤ 0.85, was prepared by a solid-state reaction method. Based on a two-phase composite strategy, its microwave dielectric properties were optimized through the dual synergistic regulation of composition and crystal structure. The ceramic exhibited optimal overall performance at a sintering temperature of 1320 °C and x = 0.8. r =17.07, Q×f=76,546 GHz, τ f =-8.3 ppm / °C, possessing both near-zero temperature coefficient and low dielectric loss characteristics. The dielectric resonator antenna made from this ceramic exhibits high gain, high efficiency, and excellent radiation performance at 5.72 GHz (C-band), and can be widely used in C-band and 5G / 6G wireless communication devices.

The application discloses a compact dielectric resonator antenna module, which comprises a substrate assembly and a dielectric resonator arranged on the substrate assembly. The dielectric resonator comprises a connecting part and four isosceles trapezoidal columns. The height of the connecting part is less than the height of the isosceles trapezoidal columns. The four isosceles trapezoidal columns are evenly distributed around the connecting part. The short bottom surface of the isosceles trapezoidal column is connected with the connecting part. The long bottom surface of the isosceles trapezoidal column has a compensation part extending away from the connecting part. The connecting part, the isosceles trapezoidal column and the compensation part are integrally formed into an integrated structure. The dielectric resonator antenna module has a compact structure and a small overall volume. The dielectric resonator only needs to be installed once as a whole, thereby reducing the alignment error generated in the installation process and facilitating the guarantee of the antenna performance. The height difference between the connecting part and the isosceles trapezoidal column in the height direction achieves a decoupling effect to some extent, thereby reducing the coupling between the isosceles trapezoidal columns. The dielectric resonator antenna module can cover the N258 frequency band in 5G.

The present disclosure relates to a dual-mode filter, comprising: an electrically conductive casing defining a first resonance cavity and a second resonance cavity located adjacently and separated from each other by a partition wall inside the casing; a first cross-shaped TM dual mode dielectric resonator provided in the first resonance cavity and comprising a crossing portion and two horizontal arms and two vertical arms integrally extending from its crossing portion; and a second cross-shaped TM dual mode dielectric resonator provided in the second resonance cavity and comprising a crossing portion and two horizontal arms and two vertical arms integrally extending from its crossing portion. The first resonator and the second resonator are positioned substantially parallel to each other and coupled by a main coupling structure extending through the partition wall. An orthogonality-disrupting coupling structure is provided on a crossing portion of each of the first and second resonators and extends diagonally or parallel to a diagonal section of the crossing portion such that a first operation mode and a second operation mode of the resonator where the orthogonality-disrupting coupling structure is provided are coupled thereby. At least one cross-coupling window is provided in the partition wall. At least one conductive strip each extends across one cross-coupling window, without any conductive contact with the resonators and walls of the resonance cavities. Orientations of the orthogonality-disrupting coupling structures, a position, a shape and a size of the cross-coupling window, and a shape and a size of the conductive strip are selected in such a manner that the orthogonality-disrupting coupling structures, the at least one cross-coupling window and the at least one conductive strip cooperate with the main coupling structure together so as to have transmission zeros positioned in a controllable manner with respect to a passband of the filter. The present disclosure also relates to a communication device comprising an above-said dual-mode filter.

A radio frequency coil device and array for ultrahigh field magnetic resonance imaging comprises a coaxial dipole antenna and a dielectric resonator antenna which work in a collaborative excitation mode, and the coaxial dipole antenna is in a circular ring shape or a rectangular ring shape and is provided with a first radio frequency port; the dielectric resonator antenna comprises a dielectric resonator and a coupling coil, the dielectric resonator, the coupling coil and the coaxial dipole antenna are sequentially distributed in parallel at intervals along the Y axis, the coupling coil is provided with a second radio frequency port, and the dielectric resonator forms a resonant cavity and realizes energy coupling with the coaxial dipole antenna through the coupling coil; excitation signals are respectively applied to the first radio frequency port and the second radio frequency port, so that the coaxial dipole antenna and the dielectric resonator antenna respectively generate orthogonal electromagnetic field distribution, and low-channel coupling is realized. Through the collaborative excitation mode and the orthogonal electromagnetic field distribution design, coupling between channels is effectively reduced, the B1 + field uniformity is improved, meanwhile, the peak SAR is reduced, and the imaging efficiency and safety are improved.

The invention provides a metal patch loaded miniaturized dielectric resonator antenna for a base station, and relates to the technical field of wireless communication, a specific parasitic metal patch is introduced at the bottom of a dielectric resonator, the limitation that the traditional design only depends on geometric dimension to adjust the frequency is broken through, the TM12 high-order mode frequency is obviously pulled down to be close to a fundamental mode TM10 and fusion is realized, and the antenna has the advantages of being simple in structure and convenient to use. On the premise that the size of the antenna is not increased, the working bandwidth is expanded to 3.4-4.0 GHz. Through the structural design, a cross-shaped groove structure is loaded in the central area of the dielectric resonator, a current path of a TM20 parasitic mode is cut off accurately, directional diagram distortion and cross polarization interference caused by the mode are effectively suppressed, and it is ensured that the antenna has stable radiation performance. Therefore, the antenna has excellent broadband and radiation characteristics, can still keep compact physical size, low profile structure and simple processing technology, and meets the urgent demand of a microwave frequency band wireless communication terminal on high performance and miniaturization antennas.

This invention provides a silicon-based dielectric resonant antenna with adjustable beamwidth, comprising a beamwidth adjustment structure, an antenna substrate and a dielectric resonator, an excitation antenna, and solder bumps. The multilayer antenna substrate and dielectric resonator are arranged sequentially from top to bottom, with an air cavity formed in the middle. The excitation antenna is located at the bottom of the air cavity. The beamwidth adjustment structure is located on top of the top layer of the antenna substrate and dielectric resonator. A through-silicon via (TSV) is located in the middle of the bottom layer of the antenna substrate and dielectric resonator, with solder bumps located at the bottom of the TSV. This invention significantly reduces the antenna size and improves its radiation efficiency by using high-resistivity silicon as the antenna dielectric. By introducing an air cavity structure and adjusting the beamwidth through the top-layer beamwidth adjustment structure, the antenna application frequency can be changed according to usage, the feeding method can be modified and optimized according to application conditions, and it can be stacked with chips to achieve three-dimensional heterogeneous high-density integration.

The invention provides a three-mode dielectric resonator which comprises a dielectric block, the dielectric block is provided with a pair of first resonant blind holes, a pair of second resonant blind holes and a third resonant blind hole, the first resonant blind holes are arranged along a first diagonal direction of the dielectric block and used for forming a first resonant mode, and the second resonant blind holes are arranged along a second diagonal direction of the dielectric block and used for forming a third resonant mode. The pair of second resonance blind holes are arranged along a second diagonal direction of the dielectric block and are used for forming a second resonance mode, the third resonance blind holes are used for forming a third resonance mode, and the first diagonal direction and the second diagonal direction intersect with each other. The invention also provides a dielectric waveguide filter and a dielectric waveguide duplexer using the resonator unit. When the resonator unit is used for designing a dielectric waveguide filter, a three-mode waveguide structure with independently adjustable resonant modes is realized, multiple resonant modes are realized under the same volume, the overall Q value benefit is achieved, and the resonator unit has the advantages of miniaturization and high Q value benefit.

The present application is applicable to the field of communication technology, and provides a filter and a communication device, wherein the communication device includes a filter, and the filter includes a cavity, a cover plate, a dielectric resonator and a fastener. The cover plate covers the cavity and is provided with a first hole therethrough. The dielectric resonator is provided in the cavity and is supported by the cover plate. A second hole opposite to the first hole is provided at one end of the dielectric resonator facing the cover plate. The fastener is passed through the first hole and locked in the second hole to relatively fix the dielectric resonator and the cover plate along the through-direction of the first hole. By passing the fastener through the first hole of the cover plate and locking it in the second hole of the dielectric resonator, the dielectric resonator and the cover plate can be relatively fixed along the through-direction of the first hole. In this way, the cover plate and the dielectric resonator can be stably, tightly and reliably fitted along the through-direction of the first hole under the action of the fastener, which can effectively reduce the insertion loss and intermodulation of the filter and improve the performance indicators of the filter.

An electronic device may be provided with an antenna module having a substrate. A phased antenna array of dielectric resonator antennas and a radio-frequency integrated circuit for the array may be mounted to one or more surfaces of the substrate. The dielectric resonator antennas may include dielectric columns excited by feed probes. The feed probes may be printed onto sidewalls of the dielectric columns or may be pressed against the sidewalls by biasing structures. A plastic substrate may be molded over each dielectric column and each of the feed probes in the array. The feed probes may cover multiple polarizations. The array may include elements for covering multiple frequency bands. The dielectric columns may be aligned a longitudinal axis and may be rotated at a non-zero and non-perpendicular angle with respect to the longitudinal axis.