CN114172480A

CN114172480A - Switch filtering assembly capable of improving isolation

Info

Publication number: CN114172480A
Application number: CN202111520314.0A
Authority: CN
Inventors: 李亮; 陈坤; 陈晋玮; 尹红波; 王成; 寇小兵; 张发成; 陈澄
Original assignee: Yangzhou Haike Electronic Technology Co ltd
Current assignee: Yangzhou Haike Electronic Technology Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-03-11
Anticipated expiration: 2041-12-13
Also published as: CN114172480B

Abstract

The invention relates to the technical field of switch filtering, in particular to a switch filtering component capable of improving isolation. The problem of among the prior art filtering process isolation lower is solved.

Description

Switch filtering assembly capable of improving isolation

Technical Field

The invention relates to the technical field of switch filtering, in particular to a switch filtering assembly capable of improving isolation.

Background

Filtering is an operation of filtering out specific band frequencies in a signal, and is an important measure for suppressing and preventing interference. Which removes noise and high frequencies from the input signal of the applied power to provide the resulting input signal to the load. The filtering component is a special component for realizing frequency band filtering, and can enable specific frequency components in signals to pass through, greatly attenuate or inhibit other frequency components, and realize the functions of filtering, coexistence, duplexing, aggregation and the like of radio frequency signals. From the application point of view, the method can be divided into two fields of civil use and military use. In the civil aspect, the filter is widely applied to the fields of mobile phones, tablet computers, smart homes, automobiles and biomedicine, and has a huge market; in the military aspect, the filter has important application in military fields such as Beidou GPS navigation, electronic countermeasure and the like, and can be said to be an important ring about national information safety. The international telecommunication union is an important special mechanism of the united states, and is also an international organization with the longest history in the mechanisms of the united states, which is called international union, international union or international union, and is a united state mechanism for managing information communication technology affairs, and is responsible for allocating and managing global radio spectrum and satellite orbit resources, formulating global telecommunication standards, providing telecommunication assistance to developing countries, and promoting global telecommunication development. The ITU allocates the frequency band of the satellite service to different services, the most common frequency bands of the satellite service at present are C (4-8GHz) and Ku (12-18GHz) frequency bands, wherein the C frequency band is used for the satellite fixed service, and the Ku frequency band is used for the satellite fixed service and the direct broadcast satellite service, but in the existing communication field, the electromagnetic environment is more and more complex, and the interference caused to satellite communication equipment is more and more large.

Disclosure of Invention

The invention aims to provide a switch filtering component capable of improving isolation, and solves the problem of low isolation in the filtering process in the prior art.

The object of the invention is achieved by the following technical solution,

a switch filtering component capable of improving isolation comprises a substrate, wherein a first group of channels and a second group of channels are arranged on the upper surface of the substrate in parallel, a first channel is arranged in the first group of channels, a second channel and a third channel are arranged in the second group of channels, and a switch is arranged between the first channel and the second channel. The second channel and the third channel have the same structure and different frequencies, the first channel is a microstrip line, and the second channel is a strip line.

It should be noted that the isolation is improved by two different sets of channels.

The second channel is a nine-step band stop and comprises a main channel and nine branch circuits, wherein four branch circuits are arranged above the main channel, and five branch circuits are arranged below the main channel.

It should be noted that, in the following description,

the branch at the left end below the main road is opposite to the branch adjacent to the right side of the main road in direction.

It should be noted that, in the following description,

the two switches are of a symmetrical structure and are respectively positioned at two ends of the substrate.

It should be noted that the control of the opening and closing of different channels is realized by two switches.

The switch is a single-pole four-throw switch.

It should be noted that all channels can be controlled by the single-pole four-throw switch.

The lower surface of the substrate is provided with a power supply module, the power supply module is connected with a control wire, and the control wire penetrates through the substrate and is connected with the upper surface of the substrate.

This arrangement improves the consistency of work between structures.

And a resistor is connected in series on the control line.

It should be noted that the series resistance is used to improve the anti-electrostatic breakdown capability and surge capability.

And the output end of the switch is connected with a blocking capacitor.

It should be noted that the dc blocking capacitor is added to avoid the mutual influence between the products.

The upper surface of the substrate is provided with a coplanar waveguide.

It should be noted that, by providing the coplanar waveguide structure, the isolation between products can be effectively improved, so that the stop band suppression is not affected by the switch isolation.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the device has three channels, wherein the first channel is a through channel, the second channel and the third channel are both band-stop channels, and the frequencies of the second channel and the third channel are different. The second channel and the third channel of the two band elimination filters are strip lines and are straight-through, namely the first channel is a microstrip line;

2. the anti-static breakdown capability and the surge capability are improved by controlling the series resistance of the line;

3. through the band-stop filter with the strip line structure, transmission zero is introduced by using a plurality of quarter-wavelength branches to complete the design of the stop band, and the band-stop filter is small in size, high in integration level, good in consistency and convenient to produce in batches.

Drawings

FIG. 1 is one of the schematic structural diagrams of the present invention;

FIG. 2 is a graph of simulation results for a first channel of the present invention;

FIG. 3 is a diagram of a simulation model of a coplanar waveguide of the present invention;

FIG. 4 is a graph of simulation results for a coplanar waveguide of the present invention;

FIG. 5 is a second schematic structural diagram of the present invention;

FIG. 6 is a third schematic structural diagram of the present invention;

FIG. 7 is one of the graphs of the standing wave simulation results of the present invention;

FIG. 8 is a graph showing the results of the stop band simulation of the present invention;

FIG. 9 is a fourth schematic structural view of the present invention;

FIG. 10 is one of the graphs of the standing wave simulation results of the present invention;

FIG. 11 is a second graph of the simulation result of the stop band of the present invention;

fig. 12 is a structural view of the switch of the present invention.

Detailed Description

Referring to fig. 1 to 11, the present embodiment provides a switch filter assembly capable of improving isolation, which is mainly used to solve the problem of low isolation in the filtering process of the prior art, and is already in practical use.

The present application proceeds through the following examples,

example 1

A switch filtering component capable of improving isolation comprises a substrate, wherein a first group of channels and a second group of channels are arranged on the upper surface of the substrate in parallel, a first channel is arranged in the first group of channels, a second channel and a third channel are arranged in the second group of channels, and a switch is arranged between the first channel and the second channel. The second channel and the third channel have the same structure and different frequencies, the first channel is a microstrip line, and the second channel is a strip line. The second channel is a nine-step band stop and comprises a main channel and nine branch circuits, wherein four branch circuits are arranged above the main channel, and five branch circuits are arranged below the main channel. The branch at the left end below the main road is opposite to the branch adjacent to the right side of the main road in direction.

It should be noted that the device has three channels, wherein the first channel is a through channel, the second channel and the third channel are both band-stop channels, and the frequencies of the second channel and the third channel are different. The second channel and the third channel of the two band elimination filters are strip lines and are straight-through, namely the first channel is a microstrip line. The international telecommunication union ITU distributes frequency bands of satellite services to different services, the most common frequency bands of the satellite services at present are C (4-8GHz) and Ku (12-18GHz), wherein the C frequency band is used for satellite fixed services, and the Ku frequency band is used for satellite fixed services and direct broadcast satellite services, in the communication field, the more complex the electromagnetic environment is, the greater the interference to satellite communication equipment is, the second channel and the third channel in the invention can select the required frequency bands according to different application occasions, and filter the unnecessary frequency bands to achieve the best communication effect. On the other hand, the traditional band-stop filter adopts a cavity structure, and a tuning rod is used inside the traditional band-stop filter to introduce a transmission zero point so as to complete the design of a stop band, but the traditional band-stop filter has the defects of large volume, high price and difficulty in integration. The band-stop filter with the line structure is adopted, transmission zero is introduced by using a plurality of quarter-wavelength branches to complete the design of the stop band, the band-stop filter is small in size, high in integration level, good in consistency and convenient for batch production, and the problems that the existing structure is large in size, high in price and difficult to integrate are solved. The resulting layout is shown in fig. 1, and the isolation simulation curve between the microstrip lines of this embodiment is shown in fig. 2.

Example 2

On the basis of embodiment 1, a switching filter assembly capable of improving isolation is provided, which specifically comprises: the two switches are of a symmetrical structure and are respectively positioned at two ends of the substrate. The two switch chips are in a symmetrical pairing structure. The switch is a single-pole four-throw switch. When the single-pole four-throw switch is actually used, one way of the single-pole four-throw switch is idle and is not used. The upper surface of the substrate is provided with a coplanar waveguide. The single-pole four-throw switch adopts a switch chip integrating the left mirror image relation and the right mirror image relation of TTL drive, the structure diagram of the mirror image switch is shown in figure 12, and specifically, a signal port, a control pin and a power supply pin are all in mirror images and are respectively distributed on a switch 1 and a switch 2. The structure does not need to be additionally provided with a logic device for logic conversion, can simplify the design process of the circuit driving control circuit to the greatest extent, improves the circuit integration level, and is beneficial to miniaturization. Specifically, a coplanar waveguide structure is arranged at the positions of the single-pole four-throw switches at the left side and the right side, so that the isolation between a plurality of products can be effectively improved, and the stop band suppression is not influenced by the switch isolation. The results of the coplanar waveguide for improved isolation are shown in table 1:

TABLE 1

Therefore, the coplanar waveguide has great advantage in improving isolation, and can be higher than a common microstrip line by more than 10 dB. The simulation model of the isolation between the coplanar waveguide transmission lines in this embodiment is shown in fig. 3, and the simulation curve of the isolation between the coplanar waveguide transmission lines in this embodiment is shown in fig. 4.

Example 3

On the basis of embodiment 2, a switching filter assembly capable of improving isolation is provided, which specifically comprises: the lower surface of the substrate is provided with a power supply module, the power supply module is connected with a control wire, and the control wire penetrates through the substrate and is connected with the upper surface of the substrate. And a resistor is connected in series on the control line. It should be noted that the power supply module directly passes through the substrate from the back of the product to realize power supply and control, wherein the control line promotes the anti-electrostatic breakdown capability and surge capability through the series resistor.

And the output end of the switch is connected with a blocking capacitor. The line of substrate lower surface directly links to each other with power supply glass insulator, and the switch output avoids mutual influence through increasing blocking capacitor. The structure of this embodiment is shown in fig. 5.

Example 4

In this embodiment, the passband of the second channel is KU band, the stopband is X band, specifically, the passband standing wave is less than 1.6, and the stopband rejection is higher than 52dB, the structure of this embodiment is shown in fig. 6, the standing wave simulation result of this embodiment is shown in fig. 7, and the stopband simulation result of this embodiment is shown in fig. 8.

Example 5

In this embodiment, the passband of the third channel is an X band, the stopband is a KU band, specifically, the passband standing wave is less than 1.7, and the stopband rejection is higher than 60dB, the structure of this embodiment is shown in fig. 9, the standing wave simulation result of this embodiment is shown in fig. 10, and the stopband simulation result of this embodiment is shown in fig. 11.

Example 6

In this embodiment, one switch control is K1 and one switch control is K2, the switch settings of which are shown in table 2:

gated channel	K1	K2
			First channel	0	0
The second channel	0	1
			Third channel	1	0

TABLE 2

When K1 is 0; when K2 is 0, the parameters of the first channel are shown in table 3:

passband frequency (GHz)	X/KU
		Pass-band loss (dB)	≤8.5
Amplitude uniformity (dB)	≤±0.3
		Inner wave (dB)	≤±1
Input/output standing wave	≤2.2

TABLE 3

When K1 is 0; when K2 is 1, the parameters of the second channel are shown in table 4:

passband frequency (GHz)	KU
		Pass-band loss (dB)	≤8.5
Input/output standing wave	≤2.2
		Amplitude uniformity (dB)	≤±0.3
Inner wave (dB)	≤±1
		Stop band frequency (GHz))	X
Stopband rejection (dB)	≥45dBc

TABLE 4

When K1 is 1; when K2 is equal to 0, the parameters of the third channel are as shown in table 5:

passband frequency (GHz)	X
		Pass-band loss (dB)	≤8.5
Input/output standing wave	≤2.2
		Amplitude uniformity (dB)	≤±0.3
Inner wave (dB)	≤±1
		Stopband frequency (GHz)	KU
Stopband rejection (dB)	≥45dBc

TABLE 5

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A switch filter assembly capable of improving isolation, comprising: the device comprises a substrate, wherein a first group of channels and a second group of channels are arranged on the upper surface of the substrate in parallel, the first group of channels are provided with first channels, the second group of channels are provided with second channels and third channels, and a switch is arranged between the first channels and the second channels.

2. The switch filter assembly capable of improving isolation of claim 1, comprising: the second channel and the third channel have the same structure and different frequencies, the first channel is a microstrip line, and the second channel is a strip line.

3. A switch filter assembly capable of improving isolation according to claim 2, comprising: the second channel is a nine-step band stop and comprises a main channel and nine branch circuits, wherein four branch circuits are arranged above the main channel, and five branch circuits are arranged below the main channel.

4. A switched filter assembly as claimed in claim 3, comprising: the branch at the left end below the main road is opposite to the branch adjacent to the right side of the main road in direction.

5. The switch filter assembly capable of improving isolation of claim 1, comprising: the two switches are of a symmetrical structure and are respectively positioned at two ends of the substrate.

6. The switch filter assembly capable of improving isolation of claim 5, comprising: the switch is a single-pole four-throw switch.

7. A switch filter assembly according to any of claims 1 to 6, comprising: the lower surface of the substrate is provided with a power supply module, the power supply module is connected with a control wire, and the control wire penetrates through the substrate and is connected with the upper surface of the substrate.

8. The switch filter assembly capable of improving isolation of claim 7, comprising: and a resistor is connected in series on the control line.

9. The switch filter assembly capable of improving isolation of claim 8, comprising: and the output end of the switch is connected with a blocking capacitor.

10. A switched filter assembly with improved isolation as claimed in claim 9, comprising: the upper surface of the substrate is provided with a coplanar waveguide.