CN219203462U - Filtering amplifier - Google Patents

Abstract

The utility model discloses a filter amplifier in the technical field of microwave electronic devices, and aims to solve the problems of large insertion loss, small out-of-band rejection and low amplification gain of the filter amplifier in the prior art. The filter comprises a filter module and an amplifying module, wherein a first waveguide port is formed in the side wall of the filter module, which is attached to the amplifying module, and a filter is arranged in the first waveguide port; the amplifying module is provided with a second waveguide port, and a waveguide microstrip conversion and amplifier chip serial group is arranged in the second waveguide port; the waveguide microstrip conversion comprises a microstrip probe, a matching section and a microstrip line which are sequentially connected, wherein the input end and the output end of the amplifier chip serial group are respectively connected with the microstrip line in the adjacent waveguide microstrip conversion, a plurality of leads are arranged outside the amplifying module, and the leads are electrically connected with the corresponding amplifier chips in the amplifier chip serial group; the utility model is suitable for the radio frequency front-end circuit, has the advantages of small insertion loss, large out-of-band rejection and large amplification gain, and has good comprehensive use effect.

Description

Filtering amplifier

Technical Field

The utility model relates to the technical field of microwave electronic devices, in particular to a filter amplifier.

Background

The specific frequency band of terahertz waves can be between 0.1T and 10T, so the corresponding wavelength range should be between 0.03mm and 3 mm. Terahertz waves have a superposition part between a low frequency band and a millimeter wave frequency band, and are superposed with a radiation wave band of infrared light in a high frequency band, and the terahertz waves are used as a more emerging radiation source, so that the terahertz waves have a plurality of advantages in the current scientific research field. 220GHz is the frequency of an 'atmospheric window' in a terahertz frequency band, has important application value in the fields of radars and communication, and a filter amplifier which is a component of a receiving system occupies an important position in the system, so that the filter amplifier working near the 220GHz frequency band is one of hot spots for research.

The filter amplifier amplifies and filters the radio frequency receiving signal, which is a key module of the radio frequency front-end circuit, and can directly influence the performance and the size of the whole electronic system. The main function of the method is that firstly, signals output by a transmitting end are isolated to prevent the saturation of a receiving front end; and then a weaker signal in the system is converted into a larger signal output system required by the condition, so that reasonable gain is provided for the communication system.

However, the conventional filter amplifier has high insertion loss in the passband and poor suppression effect on signals transmitted in the stopband, so that the transmission of useful signals can be interfered to a certain extent, the amplification gain on the signals is not high, and the comprehensive use effect is poor.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, provides a filter amplifier, and solves the problems of large insertion loss, small out-of-band rejection and low amplification gain of the current filter amplifier.

In order to solve the technical problems, the utility model is realized by adopting the following technical scheme:

the utility model provides a filter amplifier, comprising: the filter module and the amplifying module are detachably connected, a first waveguide port is formed in the side wall, which is attached to the amplifying module, of the filter module, the first waveguide port is arranged along the axis direction of the filter module and penetrates through the other side of the filter module, and a filter is arranged in the first waveguide port;

the amplifying module is provided with a second waveguide port which is in butt joint with the first waveguide port, the second waveguide port is arranged along the axis direction of the amplifying module and penetrates through the other side of the amplifying module, and a waveguide microstrip conversion and an amplifier chip serial group positioned between the waveguide microstrip conversions are arranged in the second waveguide port;

the waveguide microstrip conversion comprises a microstrip probe, a matching section and a microstrip line which are sequentially connected, wherein the input end and the output end of the amplifier chip serial group are respectively connected with the microstrip line in the adjacent waveguide microstrip conversion, a plurality of wires for externally connecting a power supply are arranged outside the amplifying module, and the wires are electrically connected with the corresponding amplifier chips in the amplifier chip serial group.

Furthermore, the amplifier chips in the amplifier chip series group are connected in series through bonding wires, and the input end and the output end of the amplifier chip series group are respectively connected with the microstrip lines in the microstrip conversion of the adjacent waveguide through the bonding wires.

Further, the series group of amplifier chips includes a first stage amplifier chip having a model TCC1957A and a second stage amplifier chip having a model TCC2021A.

Further, the first waveguide port and the second waveguide port are both standard BJ2200.

Further, an insulator is arranged on the amplifying module, and the lead is electrically connected with a corresponding amplifier chip in the amplifier chip series group through the insulator.

Further, the filter comprises six coupling structures and five half-wavelength resonators alternately arranged, and a cavity structure for transmitting the zero point.

Furthermore, flange plates are embedded on the side walls of the filtering module and the amplifying module, and a plurality of pins and pin holes are arranged on the flange plates;

the plurality of pins on one flange plate can be inserted with the plurality of pin holes on the other flange plate in a one-to-one correspondence manner, so that the detachable connection of the filtering module and the amplifying module is realized.

Further, the top and the bottom of the filtering module are provided with first clamping grooves, and the bottom of the amplifying module is provided with second clamping grooves.

Compared with the prior art, the utility model has the following beneficial effects:

1. the waveguide microstrip conversion integral transition structure mainly comprises a microstrip probe, a matching section and a microstrip line, and has the advantages of wide working frequency band, small insertion loss, simple circuit processing, relatively insensitivity to assembly errors and good use effect;

2. the utility model realizes the final gain requirement by cascading the amplifier chip series groups, has the advantage of large amplification gain, and has better effect;

3. the filter of the utility model adopts a waveguide filter, and the filtering mode adopts a band-pass filtering mode, and has the characteristics of small insertion loss and large out-of-band inhibition, and has good filtering effect.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of a filter amplifier according to an embodiment of the present utility model;

FIG. 2 is a side cross-sectional view of an amplification module in the filter amplifier of FIG. 1;

FIG. 3 is a schematic diagram of a waveguide microstrip transition in the filter amplifier shown in FIG. 1;

FIG. 4 is a side cross-sectional view of a filter module in the filter amplifier of FIG. 1;

FIG. 5 is a schematic diagram of the configuration of the filter in the filter amplifier of FIG. 1;

FIG. 6 is a side view of the filter shown in FIG. 5;

FIG. 7 is a top view of the filter shown in FIG. 5;

FIG. 8 is an S-parameter simulation of the filter of FIG. 5;

in the figure: 1. a filtering module; 11. a first waveguide port; 12. a filter; 121. a coupling structure; 122. a resonator; 123. a cavity structure; 13. a first clamping groove; 2. an amplifying module; 21. a second waveguide port; 22. waveguide microstrip conversion; 221. a microstrip probe; 222. a matching section; 223. a microstrip line; 23. an amplifier chip series group; 231. a first stage amplifier chip; 232. a second stage amplifier chip; 24. a wire; 25. an insulator; 26. the second clamping groove; 3. a flange plate; 31. a pin; 32. pin holes.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

Embodiment one:

as shown in fig. 1 to 4, an embodiment of the present utility model provides a filter amplifier, including: the filter module 1 and the amplifying module 2 which is detachably connected with the filter module 1 are arranged on the side wall of the filter module 1, which is attached to the amplifying module 2, a first waveguide port 11 is formed in the side wall of the filter module 1, the first waveguide port 11 is arranged along the axial direction of the filter module 1 and penetrates through to the other side of the filter module 1, and a filter 12 is arranged in the first waveguide port 11;

the amplifying module 2 is provided with a second waveguide port 21 which is butted with the first waveguide port 11, the second waveguide port 21 is arranged along the axis direction of the amplifying module 2 and penetrates through the other side of the amplifying module 2, and a waveguide microstrip conversion 22 and an amplifier chip serial group 23 positioned between the waveguide microstrip conversions 22 are arranged in the second waveguide port 21;

the waveguide microstrip transition 22 comprises a microstrip probe 221, a matching section 222 and a microstrip line 223 which are sequentially connected, the input end and the output end of the amplifier chip serial group 23 are respectively connected with the microstrip line 223 in the adjacent waveguide microstrip transition 22, a plurality of wires 24 for externally connecting a power supply are arranged outside the amplifying module 2, and the wires 24 are electrically connected with corresponding amplifier chips in the amplifier chip serial group 23.

During operation, the first waveguide port 11 on one side wall of the filter module 1 far away from the amplifying module 2 is in butt joint with the transmitting end of external equipment, so that signals firstly enter the filter 12 through the first waveguide port 11, then enter the second waveguide port 21 on the amplifying module 2, then reach the amplifier chip serial group 23 through the waveguide microstrip conversion 22, finish signal amplification, and finally pass through the waveguide microstrip conversion 22 on the other side, and transmit the signals out through the other end of the second waveguide port 21; and the wires 24 are connected to an external power source to power the corresponding amplifier chip.

It should be noted that, the waveguide microstrip transition 22 is a key technology of the amplifying module, and can directly affect the amplifying gain of the amplifying module, so it is necessary to have the effects of wide frequency band, small insertion loss and good standing wave. The waveguide microstrip transition 22 has three main forms, namely waveguide-microstrip probe-microstrip line transition, waveguide-insulator probe-microstrip line transition, and waveguide antipodal fin line-microstrip line transition. However, because it is difficult to find an applicable insulator in the G frequency band, waveguide-insulator probe microstrip line conversion is not commonly used in this frequency band; the microstrip probe is widely applied due to the characteristics of wide working frequency band, small insertion loss, simple circuit processing and relatively insensitive to assembly errors; the waveguide microstrip transition 22 in this embodiment thus takes the form of a transition from waveguide-microstrip probe-microstrip line.

It will be appreciated that the waveguide microstrip transition 22 functions to couple energy from the waveguide to the microstrip line, and that both the microstrip line and the waveguide are transmission lines important in the millimeter wave band, and that the passive transition circuit for converting the waveguide to the microstrip is designed to transfer energy transmitted in the form of electric waves in the waveguide to the amplifying circuit through the planar structure of the microstrip line.

Specifically, the waveguide microstrip transition 22 adopts a waveguide-microstrip probe-microstrip line transition form, the microstrip probe 221 is inserted from the center of the broad side of the waveguide, the medium and the microwave transmission direction are parallel, and an E-plane probe transition form is adopted.

In this embodiment, the overall transition structure of the waveguide microstrip transition 22 mainly comprises a rectangular microstrip probe 221, a matching section 222 and a 50 ohm microstrip line 223. The main function of the matching section 222 is to match the impedance of the microstrip probe 221 with the 50 ohm microstrip line, so that the waveguide can be effectively transmitted to the microstrip.

Preferably, as shown in fig. 3, in this embodiment, the microstrip line 223 is made of quartz with a thickness of 0.05mm, and has a dielectric constant of 3.78, and the microstrip probe 221 is: wide w1=0.04 mm, long l1=0.1 mm, matching section 222: wide w3=0.02 mm, long l3=0.04 mm, microstrip line 223: width w2=0.065 mm. Because the gains are directly added under the condition of multistage amplification, the design requirement that the gain of the amplifying module 2 is 35dB-42dB can be realized.

In the present embodiment, the amplifier chips in the amplifier chip serial group 23 are connected in series by bonding wires, and the input end and the output end of the amplifier chip serial group 23 are respectively connected with the microstrip line 223 in the adjacent waveguide microstrip transition 22 by bonding wires.

Specifically, the serial connection of the components in the amplifying module 2 is completed through bonding wires, so that the components can be conveniently arranged in positions in the second waveguide port 21 according to design requirements.

In the present embodiment, the amplifier chip serial group 23 includes a first-stage amplifier chip 231 and a second-stage amplifier chip 232, the model of the first-stage amplifier chip 231 is TCC1957A, and the model of the second-stage amplifier chip 232 is TCC2021A.

It can be understood that the operating frequency of the whole filter amplifier is 215 GHz-225 GHz, and it is known that the power gain of the single-stage chip cannot meet the requirement according to the selected frequency band, so that the series group 23 of amplifier chips is selected for cascade connection, and further the final gain requirement is achieved.

Specifically, the operating frequency of the TCC1957A power amplifier chip is: the gain at 220GHz is about 20dB, and the 1dB power compression point is about 12dBm from 210GHz to 230 GHz; and the TCC2021A power amplifier chip operating frequency is also: 210 GHz-230 GHz, the product test shows that the gain is about 19dB at 220GHz, and the saturated output power is about 16dBm when the input power added to the chip in the same frequency band is 6dBm, so that the 1dB power compression point is about 13dBm, and the design requirement is met.

In this embodiment, the amplifying module 2 is provided with an insulator 25, and the wires 24 are electrically connected to the corresponding amplifier chips in the series group of amplifier chips 23 through the insulator 25.

Specifically, in this embodiment, the wires 24 have two power sources respectively connected to the 2.4V and 2.2V voltage sources for supplying power to the first stage amplifier chip 231 of the model TCC1957A and the second stage amplifier chip 232 of the model TCC2021A. The insulator 25 prevents the lead 24 from applying voltage to the case outside the amplifying module 2, thereby improving the anti-interference capability and ensuring the normal operation of the amplifying module 2.

In this embodiment, the first waveguide port 11 and the second waveguide port 21 are each of a standard BJ2200 in type.

Specifically, the dimensions of standard BJ2200 are: the length is 1.1mm and the width is 0.55mm.

As shown in fig. 4 to 7, in the present embodiment, the filter 12 includes six coupling structures 121 and five half-wavelength resonators 122 alternately arranged, and a cavity structure 123 for transmission zero.

It should be noted that, the conventional filter 12 is mainly a cavity filter, and may be classified into a waveguide filter, a dielectric filter, a comb filter, and the like. In the millimeter-wave terahertz frequency band, the waveguide filter has the characteristics of high Q value, small insertion loss and the like, so that the filter 12 of the application adopts the waveguide filter.

The primary role of the filter 12 can be summarized as passing the useful signal with very low loss in the communication system, rejection filtering out the frequencies not needed by the system out of band. The filter can be characterized by using insertion loss when describing the working performance of the filter, and in order to obtain smaller insertion loss to realize better performance, the filtering form is selected by combining the frequency band of the signal.

It will be appreciated that since the filter is essentially a shift in resonant frequency, it can be designed by coupling together basic resonant tanks, and a path is formed between two adjacent resonators 122 by a coupling structure 121 during the design of the waveguide filter, and each resonator 122 has a fixed resonant frequency, the frequency between two different resonators 122 when coupled together by the coupling structure 121 will form a high frequency and a low frequency, thereby forming the desired filter passband, and eventually allowing the desired frequency to pass through the filter.

According to the use requirement, the cut-off frequencies of the left side and the right side of the filter passband are Start:215.057GHz, stop:225.057GHz, center frequency: 220GHz, resonance number resonants: 6, according to the index requirement, the out-of-band rejection at 195GHz-205GHz is larger than 40dB, the transmission zero zeroes is arranged at 209.058GHz, and the principle structure of the finally obtained waveguide filter is shown in figure 5.

Specifically, based on the first waveguide port 11, the standard BJ2200 (a=1.1 mm, b=0.55 mm) is adopted, and six coupling structures 121 and five half-wavelength resonators 122 are alternately arranged, the structures of which are shown in fig. 6 to 7, and the structural dimension parameters are shown in table 1:

TABLE 1

In addition, the cavity structure 123 for transmission zero shown in fig. 6 has the following dimensional parameters: l1=0.3mm, w1=0.3mm, l2=0.985 mm, w2=1.5 mm.

As shown in fig. 8, the S parameter simulation result of the filter 12 is analyzed to find that the passband is 214GHz-227GHz, that is, the bandwidth reaches 13GHz, and in addition, the S parameter simulation result shows that the suppression at 200GHz reaches 62.42dB, the suppression at 205GHz reaches 49.04dB, the indexes that the out-of-band suppression is greater than 40dB from 195GHz to 205GHz in the design indexes are satisfied, and the insertion loss at 220GHz is 0.005dB through observation, which also satisfies the requirement that the insertion loss is less than 1.5dB in the indexes.

Through the arrangement, the insertion loss of the filter module 1 is smaller than 1.5dB, the out-of-band rejection of the frequency between 195GHz and 205GHz is larger than 40dB, and the total gain of the amplifying module 2 is between 35dB and 42 dB.

Embodiment two:

as shown in fig. 1, this embodiment provides a filter amplifier, which is different from the first embodiment in that flange plates 3 are embedded on the side walls of the filter module 1 and the amplifying module 2, and a plurality of pins 31 and pin holes 32 are arranged on the flange plates 3; the plurality of pins 31 on one flange 3 can be inserted into the plurality of pin holes 32 on the other flange 3 in a one-to-one correspondence manner, so that the detachable connection of the filtering module 1 and the amplifying module 2 is realized.

Specifically, annular limiting grooves matched with the flange 3 in size are formed in the side walls of the filtering module 1 and the amplifying module 2, so that the flange 3 can be completely embedded into the side walls, the filtering module 1 and the amplifying module 2 can be tightly attached when being connected, the first waveguide port 11 and the second waveguide port 21 can be fully attached, leakage of signals at the butt joint positions of the first waveguide port and the second waveguide port is avoided, and the transmission effect is improved.

Specifically, a plurality of ladder through holes are formed in the flange plate 3, and the bolts are in threaded connection with threaded holes formed in the annular limiting grooves after sinking into the ladder through holes, so that the flange plate 3 is fixedly arranged in the annular limiting grooves.

Preferably, the flange 3 is arranged at the periphery of the waveguide port, so that the bonding tightness of the first waveguide port 11 and the second waveguide port 21 is improved, and the anti-interference capability is improved.

Through the arrangement, the filter module 1 and the amplifying module 2 can be conveniently and rapidly connected in a detachable mode, and the filter amplifier is convenient to manufacture, maintain, detect and install.

It should be noted that, the side wall of the filtering module 1 far away from the amplifying module 2 may be provided with a flange 3, and the filtering module 1 may be conveniently docked with the transmitting end of the external device through the flange 3. Similarly, the side wall of the amplifying module 2 far from the filtering module 1 can be provided with a flange plate 3, so that the receiving end of the using device can be conveniently docked.

In this embodiment, the top and bottom of the filter module 1 are both provided with the first engaging groove 13, and the bottom of the amplifying module 2 is provided with the second engaging groove 26.

Specifically, the filter module 1 is matched with the first limiting block arranged on the shell through the first clamping groove 13, so that limiting locking can be completed rapidly, and installation and arrangement are facilitated. Likewise, the amplifying module 2 is matched with a second limiting block arranged on the shell through a second clamping groove 26, so that limiting locking can be completed rapidly, and installation and arrangement are facilitated.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims (8)

1. A filter amplifier, comprising: the filter comprises a filter module (1) and an amplifying module (2) which is detachably connected with the filter module (1), wherein a first waveguide port (11) is formed in the side wall, which is attached to the amplifying module (2), of the filter module (1), the first waveguide port (11) is arranged along the axial direction of the filter module (1) and penetrates through the other side of the filter module (1), and a filter (12) is arranged in the first waveguide port (11);

the amplifying module (2) is provided with a second waveguide port (21) which is in butt joint with the first waveguide port (11), the second waveguide port (21) is arranged along the axis direction of the amplifying module (2) and penetrates through the other side of the amplifying module (2), and a waveguide microstrip conversion (22) and an amplifier chip serial group (23) positioned between the waveguide microstrip conversions (22) are arranged in the second waveguide port (21);

the waveguide microstrip conversion (22) comprises microstrip probes (221), matching sections (222) and microstrip lines (223) which are sequentially connected, the input end and the output end of the amplifier chip serial group (23) are respectively connected with the microstrip lines (223) in the adjacent waveguide microstrip conversion (22), a plurality of wires (24) for externally connecting a power supply are arranged outside the amplifying module (2), and the wires (24) are electrically connected with corresponding amplifier chips in the amplifier chip serial group (23).

2. The filter amplifier according to claim 1, characterized in that the amplifier chips of the series group (23) of amplifier chips are connected in series by means of bond wires, the input and output of the series group (23) of amplifier chips being connected by means of bond wires to microstrip lines (223) in adjacent waveguide microstrip transitions (22), respectively.

3. The filter amplifier according to claim 1 or 2, characterized in that the series group of amplifier chips (23) comprises a first stage amplifier chip (231) and a second stage amplifier chip (232), the first stage amplifier chip (231) being of the model TCC1957A and the second stage amplifier chip (232) being of the model TCC2021A.

4. The filter amplifier according to claim 1, wherein the first waveguide port (11) and the second waveguide port (21) are each of a standard BJ2200.

5. The filter amplifier according to claim 1, wherein the amplifying module (2) is provided with an insulator (25), and the wire (24) is electrically connected to a corresponding amplifier chip in the series group (23) of amplifier chips through the insulator (25).

6. The filter amplifier according to claim 1, characterized in that the filter (12) comprises six coupling structures (121) and five half-wavelength resonators (122) alternately arranged, and a cavity structure (123) for transmission zeroes.

7. The filter amplifier according to claim 1, wherein the side walls of the filter module (1) and the amplifying module (2) are embedded with flange plates (3), and the flange plates (3) are provided with a plurality of pins (31) and pin holes (32);

the plurality of pins (31) on one flange plate (3) can be in one-to-one corresponding connection with the plurality of pin holes (32) on the other flange plate (3), so that the detachable connection of the filtering module (1) and the amplifying module (2) is realized.

8. The filter amplifier according to claim 1, wherein the top and the bottom of the filter module (1) are provided with a first clamping groove (13), and the bottom of the amplifying module (2) is provided with a second clamping groove (26).

Images