40 results about "Waveguide resonator" patented technology

The invention provides a dielectric waveguide filter, a construction method and a dielectric waveguide duplexer. The construction method of the dielectric waveguide filter comprises the following steps: selecting a dielectric material based on a given target passband index; establishing a matrix four-mode dielectric waveguide resonator, and adjusting the size of a rectangular dielectric waveguide to enable the resonant mode frequency to reach a target frequency band; carrying out electromagnetic field distribution analysis on a single four-mode dielectric waveguide resonator with a set size, positioning the distribution position of a resonance mode according to the distribution condition of an electromagnetic field, and respectively embedding four blind holes in the position where the electromagnetic field is strongest in distribution so as to realize polarization fixation and frequency regulation and control on the resonance mode; selecting a coupling topology to construct a dielectric filter based on frequency regulation and control of the four-mode dielectric waveguide resonator; the additional coupling blind holes are added on the basis of the coupling topological structure so as to regulate and control the mutual coupling between the adjacent resonators. According to the technical scheme, the problem that the size of a filter in the prior art is large is effectively solved.

A method for non-invasively identifying a location of a mass or tumor including: providing a patient with a possible mass or tumor; providing a detector including one or more resonant sensors, each sensor including at least one loop resonator, at least one cavity resonator, or at least one waveguide resonator; detecting resonant frequencies at different locations on the patient's skin near locations of the mass or possible tumor; and locating the mass or tumor by noting a location of an atypical resonant frequency.

In an example of an embodiment, a plasma processing apparatus includes a processing container, a stage, an upper electrode, an inlet, and a waveguide device. The stage is provided within the processing container. The upper electrode is provided above the stage, to interpose a space within the processing container. The inlet is configured to introduce high-frequency waves. The high-frequency waves are VHF waves or UHF waves. The inlet is provided at an end of the space in the lateral direction, and extends in a circumferential direction around a central axis of the processing container. The waveguide device is configured to supply high-frequency waves to the inlet. The waveguide device includes a resonator that provides a waveguide. The waveguide of the resonator extends in the circumferential direction around the central axis and extends in the direction in which the central axis extends to be connected to the inlet.

The invention provides a high-compression-degree all-fiber vacuum compression state light source based on a waveguide resonant cavity, and relates to the technical field of quantum optics and quantum information. After laser passes through an isolator and a beam splitter, most of the laser enters a phase modulator, and a small part of the laser serves as background light; after the phase of the laser is modulated by the phase modulator, the laser enters the frequency doubling medium to generate pump light; pumping light returned by the waveguide resonant cavity enters the detector; the detector detects the intensity of the pump light returned from the waveguide resonant cavity, and the narrow-band filter filters the pump light and outputs compressed light; a waveguide crystal in the waveguide resonant cavity depends on laser emitted by the two-end coated tuning laser; the servo control system obtains an error signal through demodulation of a demodulation signal sent by the signal generator and an electric signal output by the detector, the error signal enters a control module of the servo control system to obtain a signal required for controlling the wavelength of the laser, and the wavelength is adjusted in real time by controlling tunable parameters of the laser. And the locking of the laser wavelength and the waveguide resonant cavity is realized.

Air cavity and ceramic waveguide resonator mixed filter solutions are disclosed. According to one aspect, a combined filter assembly includes an air cavity filter coupled to a ceramic waveguide (CWG) filter. The CWG filter exhibits a wall that presses against a rigid plate. Between the rigid plate and a wall of the air cavity filter is a compressible conductive gasket that is compressed between the wall of the air cavity filter and the rigid plate. The air cavity filter and the CWG filter are secured to a support base. The CWG filter is secured to the support base by flexible clamps that allow for thermal expansion of the CWG filter. The flexible clamps are secured to the support base by screws. The support base exhibits surfaces or walls that receive and anchor the screws.

The present invention relates to gas detection devices, and more particularly to volatile substance sensors, such as breath alcohol sensors. A semiconductor gas sensor device according to the present invention includes a laser structure and an optical waveguide resonator formed in the same compound semiconductor, the compound semiconductor including at least one light-emitting layer and a light-propagating layer. The optical waveguide resonator is formed in the light-propagating layer and is largely separated from the remainder of the light-propagating layer. The laser structure is positioned adjacent to a portion of the optical waveguide resonator and is arranged to transmit electromagnetic radiation at a specific wavelength band to the optical waveguide resonator, which is arranged to resonate at the specific wavelength band.

The invention discloses a single-pole double-throw switch filtering assembly based on an LTCC (Low Temperature Co-Fired Ceramic) technology. A switching circuit and an LTCC resonator are integrated, and the on-off state of a switching diode in the working process is controlled by an externally applied direct current bias voltage. When the diode is in a conducting state, the parasitic inductor and the capacitor form series resonance, and the equivalent coupling admittance converter passing through the resonator can be inverted and equivalent to an open circuit, so that a branch signal is cut off, and channel isolation is realized; and when the diode is in a closed state, the electromagnetic field distribution of the substrate integrated waveguide resonator is not obviously influenced, the filter keeps normal work, and signal passband transmission is realized. According to the structure, on one hand, the SIW waveguide integration form is used for achieving the low insertion loss characteristic; and on the other hand, the stop-band suppression degree is effectively improved by introducing the cross coupling topology. The whole circuit has the advantages of being compact in structure, low in loss, high in isolation degree, excellent in out-of-band rejection performance and the like, and the requirements of 5G and future high-speed wireless communication systems can be met.

The application discloses a dielectric waveguide resonator and a multimode dielectric waveguide resonator, which comprises a dielectric resonant cavity, the dielectric resonant cavity comprises a dielectric body and a metal plating layer wrapping an outer surface of the dielectric body; a metal loading interface is arranged in the dielectric body and is connected with the metal plating layer; the metal loading interface intersects with an intrinsic electric field direction of the dielectric resonant cavity to reduce a main mode frequency of the dielectric resonant cavity. Embodiments of the application provide a dielectric waveguide resonator and a multimode dielectric waveguide resonator, by adding a metal loading interface in a dielectric body of a dielectric waveguide resonator, the size, frequency and unloaded Q value of the dielectric waveguide resonator are kept unchanged, high-order mode harmonics are pushed away, the performance of a low-pass filter is improved, and loss is improved.

The present invention relates to a high-selectivity filtering antenna using a slotted microstrip patch, which includes a TE<subgt;101< / subgt> mode substrate integrated waveguide resonator, an upper dielectric substrate, and a slotted TM<subgt;10 mode microstrip patch stacked from bottom to top. The slotted microstrip patch is coupled and fed through the TE<subgt;101 mode substrate integrated waveguide cavity. By opening a pair of long slots on the microstrip patch, the present invention introduces radiation zeros in the upper stopband without adding an additional filtering circuit, obtaining better filtering performance, making the proposed filtering antenna have high frequency selectivity, and compensating for the disadvantage that the substrate integrated waveguide has poor suppression level outside the high frequency band due to its many modes. The simulation results show that the proposed slotted patch filtering antenna has a good impedance bandwidth (|S<subgt;11|< -10 dB) of 2.9%, the radiation zero is located at 10.86 GHz, the peak gain in the band is 6.5 dBi, and the antenna gain is flat in the passband.

Gas detecting devices and in particular volatile substance sensors such as breath alcohol devices sensors. The semiconductor gas sensor device includes a laser structure and an optical waveguide resonator formed in a same compound semiconductor which includes at least one optical emission layer and one optical propagation layer. The optical waveguide resonator is formed in the optical propagation layer and is to its greater part separated from the remaining portion of the optical propagation layer. The laser structure is provided adjacent to a portion of the optical waveguide resonator and arranged to transmit electromagnetic radiation at a specific wavelength band to the optical waveguide resonator arranged to resonate at that specific wavelength band.

According to the present invention there is provided optical assembly (1) comprising. a laser (2) which is operable to emit light: an optical wave guide (3) having an input (3a) and an output (3b). the input (3a) of the optical wave guide (3) being optically coupled to the laser (2) so that the laser (2) can input light to the wave guide (3): a resonator (5) which is optically coupled to the wave guide (3) between the input (3a) of the wave guide (3) and the output (3b) of the wave guide (3): and wherein the resonator (5) has a resonant frequency. and wherein the resonator (5) defines an optical path (11): and wherein the resonator (5) is configured so that said optical path (11) is a closed loop: and wherein the resonator (5) is configured to have a periodic change in optical characteristics along said optical path (11) so that the resonator (5) can provide a backreflection which is at the resonant frequency of the resonator: and wherein the periodic change in optical characteristics along said optical path (11) provide an amount of said backreflection, which will provide a first detuning range in which self-injection locking of the laser using said backreflection is achieved, and. a second detuning range wherein a multifrequency comb can be generated within the resonator (5): and wherein the first and second ranges at least partially overlap, so that both self-injection locking of the laser will occur and an optical resonator-based multifrequency comb is output from the wave guide (3), when the assembly (1) is in operation. There is further provided a corresponding method of providing a optical resonator-based frequency comb at an output of a waveguide, using said assembly (1).

The invention relates to the technical field of microwave and millimeter wave wireless communication, and discloses a hybrid electromagnetic coupling structure, a dielectric waveguide filter and a duplexer, the hybrid electromagnetic coupling structure comprises at least two dielectric waveguide resonator units, and an electric coupling window located at the top and a magnetic coupling window located at the bottom are arranged between two adjacent dielectric waveguide resonator units. The electric coupling window and the magnetic coupling window are correspondingly arranged up and down; the electric coupling strength is adjusted by adjusting the height and length design of the electric coupling window, and the magnetic coupling size is adjusted by adjusting the height and length design of the magnetic coupling window; through combination of the electric coupling window and the magnetic coupling window, hybrid electromagnetic coupling between two adjacent dielectric waveguide resonator units is realized. On the premise that the order of the filter circuit is not increased, more accurate and controllable transmission zeros are introduced, and meanwhile linear layout is supported, so that the frequency selectivity and design flexibility of the dielectric waveguide filter circuit are improved, and the requirements of high-frequency applications such as 5G / 6G and satellite communication are met.

This invention relates to a millimeter-wave reflection-free waveguide bandpass filter based on a balanced structure, consisting of a pair of orthogonal couplers and a pair of symmetrically arranged waveguide bandpass filters. The isolation terminals of the couplers are connected to the load. Out-of-band reflected energy phases are superimposed at the isolation ports and absorbed by the load connected to the ports. The reflected energy phases are canceled out at the input and output ports, thus achieving excellent port-free reflection performance. This invention utilizes the high intrinsic quality factor, low loss, and high rectangular coefficient characteristics of waveguide resonators to solve the high dielectric loss problem of traditional microstrip and lumped element-based reflection-free bandpass filters, making high-frequency design easier and suitable for high-power applications.

The invention discloses a patch mutual-coupling-removing antenna based on a full-wave-band resonator. The patch mutual-coupling-removing antenna comprises two upper-layer metal patches, a middle-layer metal patch, two layers of dielectric substrates, a bottom-layer metal grounding surface and two metal probes. The two upper-layer metal patches are of rectangular structures with the same size and are arranged on the upper surface of the upper-layer dielectric substrate side by side left and right; the middle-layer metal patch is positioned between the two layers of dielectric substrates; the bottom-layer metal ground plane is located on the lower surface of the lower-layer dielectric substrate, and the two metal probes are connected with the middle-layer metal patch; wherein the middle-layer metal patch forms a strip-shaped resonator. A constant-amplitude and anti-phase electric field exists between the upper-layer metal patch and the middle-layer band-shaped resonator, and the position of a feed port is regulated and controlled to enable the feed port to fall at a weak field region, so that port decoupling can be realized. And meanwhile, the band-shaped resonator only prolongs the propagation path in the vertical direction, so that the beam width of the antenna can be expanded without adding an additional parasitic unit, and the directional diagram of the antenna is not influenced.

The invention discloses a low-fluctuation double-end-direction radiation vertical polarization antenna which comprises a hole loading type double-face patch resonator and a two-end open-circuit substrate integrated waveguide resonator. And the two hole loading type double-sided patch resonators are symmetrically arranged on the left side and the right side of the two-end open-circuit substrate integrated waveguide resonator. The two-end open-circuit substrate integrated waveguide resonator is fed from the bottom to the center by a coaxial line to form an internal homodromous vertical electric field. The hole loading type double-sided patch resonator forms four equidirectional magnetic currents at two ends and a reverse magnetic current in the middle, and the four equidirectional magnetic currents and the reverse magnetic current are superposed with equivalent magnetic currents of the open-circuit substrate integrated waveguide resonators at two ends, so that low-fluctuation vertical polarization double-end radiation is realized, and bidirectional radiation is direct radiation.

Gas detecting devices and in particular volatile substance sensors such as breath alcohol devices sensors. The semiconductor gas sensor device includes a laser structure and an optical waveguide resonator formed in a same compound semiconductor which includes at least one optical emission layer and one optical propagation layer. The optical waveguide resonator is formed in the optical propagation layer and is to its greater part separated from the remaining portion of the optical propagation layer. The laser structure is provided adjacent to a portion of the optical waveguide resonator and arranged to transmit electromagnetic radiation at a specific wavelength band to the optical waveguide resonator arranged to resonate at that specific wavelength band.

A photonic chip includes a substrate and several nanophotonic devices extending laterally away from an edge of the substrate. Each nanophotonic device is free-standing where it extends laterally past the edge of the substrate, with each neighboring pair of nanophotonic devices forming a gap therebetween. Atoms trapped in optical tweezers may be transported into the gap and close enough to a nanophotonic device that the atoms strongly couple to the nanophotonic device. Each nanophotonic device may include a waveguide, resonator, coupler, or a combination thereof. To excite modes of a nanophotonic device, a free-space optical beam may be coupled into a distal end of the nanophotonic device. A top face of each nanophotonic device may be reflective to create an optical lattice over the top face. An atom may then be trapped in the potential minimum of the optical lattice that is closest to the top face.

This invention belongs to the field of microwave circuit technology, specifically providing a fourth-order filter based on a half-mode resonator to achieve performance characteristics of small size, high selectivity, and high out-of-band suppression. The invention includes: a port coupling structure, namely an input coaxial port and an output coaxial port; a filter cavity structure, namely the cavity itself; a window coupling structure, namely a long-side window coupling via and a short-side window coupling via; and a tuning structure, namely a first tuning structure, a second tuning structure, a third tuning structure, and a fourth tuning structure. This invention utilizes the high dielectric constant of the cavity itself to create a virtual magnetic wall, thereby realizing a half-mode operating dielectric waveguide resonator, and then uses four resonators to form a fourth-order bandpass filter. Due to its novel design concept, this invention reduces the size by approximately 50% compared to traditional fourth-order bandpass filters. This invention can be used in communication systems and millimeter-wave related applications.

The present invention relates to a tunable waveguide resonator and a method of tuning a frequency of the tunable waveguide resonator. The waveguide resonator comprises a waveguide part having a plurality of walls where one of the plurality of walls at least partly comprises a tuning element. The tuning element has a first main surface facing toward a first main surface of an inner wall of one other wall of the plurality of walls. The tuning element is caused to, in response to a change in a temperature of the tuning element be reversibly displaced with respect to a reference plane of the first main surface of the tuning element along an extension perpendicular to the first main surface of the one other inner wall and whereby changing a dimension of a cavity of the tunable wave-guide resonator.

This invention discloses a single-cavity, four-mode, dual-passband substrate integrated waveguide differential filter. Its top layer metal is a square metal ground with four pairs of L-shaped slots; the middle layer metal consists of two pairs of back-to-back E-type metal strips; two metallized vias connecting the top and bottom metals are distributed along one of the diagonal lines of the structure; the short ends of each E-type metal strip are connected to the bottom metal layer through metallized blind vias. This invention constructs a substrate integrated waveguide resonator loaded with E-type strips, utilizing its four modes that support differential operation with high controllability. Combined with coplanar waveguide feed line coupling to E-type strips, a diamond coupling topology with three coupling paths, non-resonant modes focused on the semi-circular structure of the E-type strips, and suppression of higher-order modes, this invention achieves a single-cavity, four-mode, dual-passband substrate integrated waveguide differential filter with multiple transmission zeros, while also considering size, high-frequency stopband width, and high / low frequency band ratio.

The invention discloses a broadband dual-polarized antenna and an antenna array for 5G millimeter wave communication, and the antenna comprises a dielectric substrate, a substrate integrated waveguide resonator, a radiation groove, a microstrip patch resonator, a plurality of arc-shaped gaps, and a feed input structure. The substrate integrated waveguide resonator comprises a plurality of first metalized through holes which are circumferentially arranged along the edge of the dielectric substrate at intervals, a first metal layer arranged on the upper surface of the dielectric substrate and a second metal layer arranged on the lower surface of the dielectric substrate, the radiation groove is formed in the first metal layer, and the center of the radiation groove coincides with the center of the first metal layer; the microstrip patch resonator is printed in the center of the first metal layer and located on the inner side of the radiation groove, the multiple arc-shaped gaps are formed in the outer side of the radiation groove, and the feed input structure comprises two second metalized through holes and two feed probes which are arranged in the microstrip patch resonator. According to the invention, the dual-polarized radiation with wide impedance bandwidth, stable high gain and high port isolation of the antenna is realized, and the manufacturing cost is reduced.

The application relates to a miniaturized double-ridge double-mode dielectric waveguide resonator and a filter containing the resonator. The resonator comprises a frequency adjusting blind hole at the center of the upper surface, and upper and lower ridges which are arranged on the left and right sides of the frequency adjusting blind hole and are parallel to each other. The resonator can independently control the main mode and the high-order mode and has the characteristics of miniaturization by using the excellent physical characteristics of the ridge waveguide which has a low main mode cutoff frequency. The application realizes a miniaturized four-order rectangular double-ridge double-mode double-passband dielectric waveguide filter by using the resonator. The double-passband filter controls the main mode frequency by using the blind hole depth, adjusts the high-order mode frequency by using the double-ridge depth, and independently controls the low-frequency and high-frequency coupling coefficients by using the coupling window length and the slot depth, so that the double-mode independent control is realized while the size is small.

A photonics gyroscope comprises a light source on a photonics chip that emits a broadband beam; a waveguide resonator; a reflective component; first and second detectors, the second detector coupled to the source; a RIN servo loop coupled between the second detector and the source; and a rate calculation unit. The beam is directed into the resonator such that it propagates in a CCW direction. A portion of the CCW beam is coupled out of the resonator toward the reflective component and reflected back as a reflected beam that is coupled into the resonator such that the reflected beam propagates in a CW direction. The CW beam is coupled out of the resonator to the first detector, which detects a resonance frequency shift between the CW and CCW beams. The RIN servo loop stabilizes an intensity of the beam such that bias error and noise is reduced.

The invention discloses a non-reflection band-pass filter based on a Wilkinson power divider and a rectangular substrate integrated waveguide resonator. According to the non-reflection band-pass filter, a complementary symmetrical structure is adopted, an isolation resistor on a transmission axis is used as an absorption resistor, and the non-reflection band-pass filter is different from a traditional reflected signal eliminating method. Due to the characteristics of the two paths of reflected signals, the phase difference is 180 degrees, mutual counteraction is achieved, and the mutual counteraction effect of the reflected signals is good. In the frequency selection process, a microstrip line is not directly used, the SIW technology is adopted, the resonant cavity is used as a transmission medium, compared with microstrip line transmission, the band-pass filter has higher power capacity and quality factor, and due to the design, the band-pass filter can work on a higher frequency wave band. The filter designed by the invention keeps very low profile height and is easy to process and produce.

The application discloses a miniaturized wide-stop-band cavity band-pass filter for satellite communication and a manufacturing method thereof, and particularly relates to the technical field of communication. The application creatively proposes a miniaturized cavity band-pass filter with wide-stop-band characteristics in view of the problems of large size and serious harmonic dispersion of a traditional metal waveguide filter; the technical scheme is as follows: a rectangular groove is etched on the center area of the upper surface of the metal ridge of a ridge waveguide resonator, and a tuning column is embedded in the groove; this design not only realizes effective downshift of the fundamental mode resonance frequency, but also widens the range of high-frequency non-dispersive frequency, so that the overall filter has smaller cross-sectional size and wider upper stop band; a half-wavelength metal resonant groove is constructed between two ridge waveguide resonators, and together with the original resonator, a three-order filter is formed, which effectively reduces the longitudinal size, introduces cross coupling, and produces a significant transmission zero point effect in the upper stop band area.

This invention proposes a dual-polarized full-duplex filter antenna, comprising a transmit port, a receive port, a first resonator, a second resonator, and a third resonator. The first and second resonators are square substrate integrated waveguide resonators, and the third resonator is a square metal patch. By employing an offset side-feed structure, with both ports offset by the same distance from the centerline of the first resonator, and by introducing a perturbation into the first resonator, the high port isolation required for full-duplex operation is achieved with a simple feeding structure. Chebyshev bandpass filtering response is achieved through coupling between the three resonators. The dual-polarized full-duplex filter antenna structure provided by this invention solves the problem of low port isolation in traditional side-feed structures, and has advantages such as simple feeding structure, flexible design, high port isolation, and bandpass filtering response.

The invention discloses a compact single-layer seven-mode broadband filtering antenna and an array application thereof.The antenna adopts a single-layer dielectric substrate and is composed of a circular patch resonator and a square substrate integrated waveguide resonator, the circular patch resonator is combined with a square substrate integrated waveguide cavity, and therefore on the premise that the structural size is not increased, the size of the antenna is reduced, and the size of the antenna is reduced. Three in-band resonance points and an out-of-band radiation zero point are obtained. On the basis, gaps are introduced into the radiation edges of the two resonators, so that two additional modes are excited on each resonator, and an out-of-band radiation zero point is additionally excited. Through reasonable arrangement of the modes, a seven-mode broadband working characteristic with three out-of-band radiation zero points is finally formed. In addition, the antenna units can be tightly arranged in an array design in a zero-spacing mode, and the array density and performance are effectively improved. According to the invention, the filtering function and the antenna radiation characteristic are successfully integrated, and the antenna has the advantages of simple structure, compact layout and excellent performance.

A fan-shaped folded waveguide resonant cavity includes a fan-shaped metal cavity and a fan-shaped metal resonant plate. The central angle of the fan-shaped metal resonant plate is smaller than the central angle of the cross-section of the fan-shaped metal cavity. A gap is provided between the radial edges of the fan-shaped metal resonant plate and the inner wall of the fan-shaped metal cavity. A strong electric field exists between the gaps to form magnetic walls and generate folded waveguide resonant modes. The gaps are formed by a combination of straight segments and extended segments along their radial edges. The extended segments are enclosed by semi-elliptical, arc-shaped, or smooth curved boundaries. A frequency-dependent coupling filter comprises at least two fan-shaped folded waveguide resonant cavities cascaded along the signal transmission direction. The resonant cavities are cascaded along the signal transmission direction. The sequential coupling structure refers to opening non-penetrating etched grooves on adjacent resonant plates, and the cascaded coupling structure has a metal coupling block at the bottom of the gap between adjacent resonant plates. This solves the compatibility problem between the frequency-dependent coupling mechanism and the folded waveguide cavity.

The invention relates to the technical field of antennas, in particular to a dual-frequency dual-polarization base station antenna. The dual-frequency dual-polarization base station antenna comprises a first substrate, a first patch layer, a grounding layer and a feed assembly, wherein a plurality of metalized through holes are formed in the first substrate; the first patch layer is provided with a first gap, a second gap and a third gap. The grounding layer is arranged on one surface, deviating from the first patch layer, of the first substrate; and the first patch layer, the grounding layer and the first substrate with the plurality of metalized through holes jointly form the substrate integrated waveguide resonator with three slot forms on the surface. The feed assembly comprises a first feed part and a second feed part, the first feed part and the second feed part are both arranged on the grounding layer and connected with the first patch layer, and the first feed part and the second feed part are respectively used for externally connecting electromagnetic signals in different polarization directions and feeding the electromagnetic signals into the substrate integrated waveguide resonator. The dual-frequency dual-polarization base station antenna provided by the invention has the advantages of low profile and miniaturization.

The present invention discloses a high-power dual-mode duplexer, belonging to the field of scatter communication technology. It includes a switching switch, a narrowband electrically tunable duplexer, a narrowband low-noise amplifier, a broadband fixed duplexer, a broadband low-noise amplifier, a broadband self-loop, a load, monitoring and power supply. The duplexer has a narrowband electrically tunable mode and a broadband fixed mode, and the two modes can be switched through a conversion switch. When the conversion switch is switched to the narrowband electrically tunable mode, the transmitted signal enters the transmission channel of the narrowband electrically tunable duplexer from the input port through the switching switch and is sent to the antenna through the switching switch. When the conversion switch is switched to the broadband fixed mode, the transmitted signal enters the transmission channel of the broadband duplexer from the input port through the switching switch and is sent to the antenna through the switching switch. The narrowband electrically tunable mode of the present invention has a narrow operating bandwidth and can effectively suppress out-of-band interference. In the broadband fixed mode, the broadband duplexer is a waveguide resonator structure, with low insertion loss in the passband and high power handling capacity. The two operating modes can be flexibly switched, making it applicable to various communication forms.