16 results about "Band rejection" patented technology

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

This application provides a radio frequency (RF) front-end module and an electronic device. The RF front-end module includes a substrate, a shielding structure, RF components, and multiple grounding branches. The substrate includes a metal layer. The shielding structure includes a shielding layer disposed on top of the substrate and shielding sidewalls, with the shielding sidewalls extending from the shielding layer toward the substrate. At least one RF component is disposed within the projection of the shielding structure onto the substrate. The grounding branches connect the metal layer and the shielding sidewalls, and are grounded through metal vias, with a gap between adjacent grounding branches. By grounding the shielding structure through the grounding branches disposed on the side of the substrate, the electromagnetic shielding effect of the shielding structure can be enhanced. Furthermore, interference signals generated inside the shielding structure can be efficiently transmitted to ground, preventing these interference signals from resonating inside the shielding structure and affecting the overall performance of the RF front-end module, thereby improving the out-of-band rejection performance of the RF front-end module.

The utility model discloses a kind of low-noise amplifier structures with high out-of-band suppression characteristics, it is related to radio frequency device technical field, wherein, low-noise amplifier includes electrically conductive and magnetically conductive shell, the top of electrically conductive and magnetically conductive shell is shaped with emission space, bottom is shaped with filter space, left side or right side is shaped with power supply space, emission space is equipped with emission module, filter space is equipped with filter module, power supply space is equipped with power supply module, power supply module, filter module and emission module are sequentially electrically connected.The technical scheme provided by the utility model can provide a kind of small volume and can prevent frequency signal leakage, with high reliability low-noise amplifier.

The application discloses a band-pass filter with multiple zero points and high out-of-band suppression based on an IPD technology. Mainly includes main circuit, input and output port; the main circuit includes first parallel capacitor, first series capacitor, first parallel inductor, second parallel capacitor, second parallel inductor, second parallel capacitor, second series capacitor, third parallel capacitor, first series inductor, third series capacitor, fourth parallel capacitor, fourth series inductor, fourth series capacitor. The application adds four zero points to suppress high frequency and low frequency, realizes higher out-of-band suppression, and improves the filtering characteristic of the band-pass filter; and higher out-of-band suppression is realized by adopting an optimized circuit structure.

The application belongs to the technical field of radio frequency microwave circuits, and particularly discloses a two-path multi-stage power amplifier with high isolation and strong out-of-band suppression. The application comprises an improved filtering power distribution module and an improved filtering power synthesis module which are of the same structure but are reversely arranged, and a first multi-stage amplification module and a second multi-stage amplification module which are of the same structure; the first multi-stage amplification module comprises an input matching bias fusion module, a first transistor, a multi-frequency point matching bias fusion module, a second transistor, a multi-frequency point matching bias fusion module, a third transistor and an output matching bias fusion module which are connected in sequence. The application can effectively suppress out-of-band harmonics, realize high power output and high efficiency within a high frequency bandwidth, and effectively reduce the area of the overall circuit structure. The application can be widely applied to high-performance radio frequency front-end systems.

The present application relates to a resonator and a manufacturing method therefor. The resonator comprises an interdigital transducer. The interdigital transducer comprises a busbar unit and an interdigital electrode unit. The busbar unit comprises two busbars opposite each other in a first direction. The interdigital electrode unit is located between the two adjacent busbars. In the first direction, a region between the two busbars is configured as a plurality of acoustic channels on the basis of the interdigital electrode unit. The portion of the interdigital electrode unit that is located in each acoustic channel forms an interdigital electrode group. Any two adjacent interdigital electrode groups have different structures. Resonant frequencies of fundamental modes in the plurality of acoustic channels are identical. The resonator has stable operating performance, and excitation positions and intensities of spurious waves generated during operation of the resonator are dispersed, such that the out-of-band rejection performance of the resonator is effectively improved. In addition, the structure of interdigital electrodes and the structure of the interdigital electrode groups in the resonator can be flexibly adjusted on the basis of actual requirements. The manufacturing steps of the manufacturing method are simple and can be easily implemented.

The application discloses a filter structure, comprising: a substrate; a first pad, a first signal line, a second signal line and a third signal line located on a first surface of the substrate, the first signal line being electrically connected with the first pad, the first signal line and the second signal line transmitting the same signal, and the first signal line and the third signal line transmitting different signals; at least one filter located on a first side of the substrate, the filter comprising a first filter unit and a second filter unit, the first filter unit being electrically connected with the first signal line, and the second filter unit being electrically connected with the second signal line; wherein the first signal line and the second signal line are arranged along a first direction, in the first direction, the third signal line is at least partially located between the first signal line and the second signal line, the first signal line and the second signal line are electrically connected through a connecting line, in a second direction, the connecting line overlaps the third signal line, and the connecting line is electrically insulated from the third signal line, so as to improve the out-of-band rejection performance of the filter.

The application discloses a four-mode reconfigurable microstrip line filter integrated with reflection-free and multi-zero-point response, which adopts a single microstrip circuit topology with left-right symmetry and is composed of an upper branch band-pass filter circuit, a T-shaped joint structure, a pair of cross-shaped absorption branches, a pair of coupled line absorption branches, five groups of switch pairs and input and output ports; the coupled lines at the two ends of the upper branch band-pass filter circuit are connected with the ground through the switch pair connection ports and the T-shaped joint structure, and the absorption branches are connected with the ports in parallel through the switches; the four-mode switching of double-band rejection, full-band reflection-free band-pass, full-band reflection-free band-stop and multi-transmission zero-point band-stop is realized in the same circuit through the on-off control of the switches; the integration degree is improved; the reflection-free characteristic of the band-stop energy dissipation is realized by relying on the resistance-loaded absorption branches; the frequency selectivity and the band-stop suppression capability are strengthened in combination with the multi-transmission zero points; and the problems of low resource reuse rate, lack of reflection-free characteristic and uneven multi-mode performance of the traditional structure are solved.

This application provides an integrated passive filter circuit, including two first filter units, two second filter units, and a third filter unit. Each filter unit includes a main path and a grounding element connected to the main path. The two second filter units are symmetrical with respect to the third filter unit. The two first filter units are symmetrical with respect to the two second and third filter units. The end of the main path of the first filter unit serves as the port of the integrated passive filter circuit. The third filter unit includes two parallel and different grounding elements. The solution provided in this application employs a semi-symmetrical structure design. The symmetrical structure on both sides effectively improves the consistency at both ends of the filter and simplifies the adjustment of the reflection characteristics on both sides of the device. The asymmetrical structure in the middle improves out-of-band rejection on both sides, reduces the number of devices, and lowers device insertion loss.

The embodiment of the present application discloses a kind of acoustic wave filters, multiple series resonators are on series branch, and parallel branch is connected between two adjacent series resonators, and parallel branch includes at least one parallel resonator and at least one ground inductance, the filter further includes: at least one parallel branch group, it is connected between two specified series resonators, and it is made of first parallel branch and second parallel branch, at least one passive coupling element, one end is connected on the connecting node between the parallel resonator and ground inductance of one parallel branch in parallel branch group, the other end is connected on the connecting node between the parallel resonator and ground inductance of another parallel branch in parallel branch group or any one connecting node except the connecting node of series branch where parallel branch group is located.The embodiment of the present application also discloses a kind of method for improving the performance of acoustic wave filter, multiplexer and communication equipment.The present application improves out-of-band rejection and improves roll-off without deteriorating in-band insertion loss.

The utility model discloses a kind of through guide integration satellite communication terminal, and the first element for the first band noise filtering of the transmission signal amplified by PA is added between PA and transmitting antenna in the embodiment of the present disclosure, the generation of the in-band interference of reception frequency point is inhibited from source head;Second element for the first band rejection processing of the transmission signal received by receiving antenna to the transmission signal received by receiving antenna is added between receiving antenna and first LNA, avoid the large signal in transmission signal to push 1st LNA to saturation state, leading to the performance of entire receiving link sharp deterioration;To 1 or n levels of first LNA, the output end of several first LNA in it is connected with third or fourth element, the gain of effective signal frequency point and band rejection effect are improved;Through increasing first, second, third and fourth element, the communication navigation function of through guide integration satellite terminal does not interfere with each other, ensure the normal reception of downlink signal when communication transmission, solve the wireless self-interference problem of through guide integration satellite communication terminal.

The present application relates to a kind of FIR digital filter design method for intermediate frequency sampling, according to the theoretical range of bandpass sampling theorem to give sampling frequency;According to the frequency spectrum position relationship of signal after sampling, mirror frequency and its periodic continuation component, determine the initial value of optimal sampling frequency;FIR digital filter design is carried out, and the filter order, single-side roll-off bandwidth, out-of-band rejection ratio are obtained;Whether the number of FPGA multiplier required by filtering operation can be satisfied is evaluated;Expand signal bandwidth, re-evaluate whether the signal after expanding bandwidth meets the requirement of bandpass sampling theorem, if necessary, adjust the out-of-band rejection ratio parameter, cutoff frequency parameter, redesign FIR digital filter, to reduce single-side roll-off bandwidth, until the requirement is met, iteration optimal sampling frequency;Carry out digital filtering trial.The present application can give the optimal FIR digital filter design within the limit of theoretical requirement and engineering non-ideal dual constraints.

The application provides a ridge waveguide-strip line transition structure with integrated band rejection function, and relates to the technical field of wireless communication. A local metal ridge discontinuity is introduced in the ridge waveguide, and the discontinuity area is electrically continuously reconstructed by using an embedded strip line, so that the radio frequency signal can be continuously transmitted between the ridge waveguide section and the strip line section along the same propagation direction, forming a transition transmission path composed of the ridge waveguide and the strip line in series. In the set 5.3-18.3 GHz operating frequency band, the transition structure can maintain good impedance matching and transmission characteristics, realizing wideband and low-reflection signal transmission. At the same time, by introducing a spur line structure on the strip line, a clear band rejection notch response can be formed at a specific frequency, so as to effectively suppress the target frequency signal on the basis of maintaining the wideband transmission characteristics.

This invention discloses a distributed LC resonant network Ku-band on-chip tunable low-pass filter. The filter includes an RF signal entering from port 1, flowing sequentially through five high-impedance microstrip lines. These five transmission lines are equivalent to five series inductors at high frequencies. At the nodes of adjacent microstrip lines, four high-impedance microstrip lines and four sets of capacitor switch arrays are connected in parallel. Each high-impedance microstrip line with a series capacitor switch array forms a parallel resonant circuit to ground. Two low-impedance open-circuit microstrip lines are connected in parallel at the input and output ports, respectively. The parasitic capacitance generated at high frequencies is used for impedance matching of the filter. The overall topology is equivalent to an eleventh-order Chebyshev low-pass filter. Compared to existing tunable on-chip low-pass filters, this invention's low-pass filter achieves adjustable cutoff frequency across the entire Ku-band, providing a wide tuning range while ensuring excellent overall performance such as high frequency selectivity, low loss, sufficient out-of-band rejection, and miniaturization.

The embodiment of the present application discloses a kind of acoustic wave filters, at least one series resonator is equipped on the series branch between the input end and the output end of the filter, at least one end in the at least one series resonator is connected with shunt branch, the shunt branch includes at least one parallel resonator and at least one ground inductance, the filter further includes: cross resonator, one end of the cross resonator is connected to the connecting node between the parallel resonator and the ground inductance of one of shunt branch, the other end of the cross resonator is connected to the connecting node of the series branch or the connecting node of other shunt branch;Wherein, the area Ares1 of the cross resonator is less than or equal to 40% of the average equivalent area Aave of the filter.The filter of the present application can improve the out-of-band rejection index at the target frequency without sacrificing insertion loss.

The embodiment of the application provides a kind of low noise amplifier, radio frequency transceiver and communication device, it is related to communication technical field, while the noise factor of low noise amplifier is considered, the demand of low noise amplifier front filter out-of-band rejection is reduced.Specific scheme is: low noise amplifier includes: amplification circuit, signal input end, signal output end, adjustable impedance matching circuit and acoustic resonator.The first end of amplification circuit and signal input end are coupled, the second end of amplification circuit and signal output end are coupled, the third end of amplification circuit and the first end of adjustable impedance matching circuit are coupled, and the second end of adjustable impedance matching circuit is grounded.The third end of amplification circuit is also coupled with the first end of acoustic resonator, and the second end of acoustic resonator is grounded.Among them, acoustic resonator is used to filter out the signal of preset frequency band input by signal input end.The embodiment of the application is used in the process that radio frequency transceiver receives signal.