CN212258955U - Radio frequency circuit, WiFi module and electronic equipment - Google Patents
Radio frequency circuit, WiFi module and electronic equipment Download PDFInfo
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- CN212258955U CN212258955U CN202021438724.1U CN202021438724U CN212258955U CN 212258955 U CN212258955 U CN 212258955U CN 202021438724 U CN202021438724 U CN 202021438724U CN 212258955 U CN212258955 U CN 212258955U
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Abstract
The embodiment of the utility model provides a radio frequency circuit, wiFi module and electronic equipment, this radio frequency circuit includes: a radio frequency transceiver, a power amplifier, a low noise amplifier, an antenna switch, an antenna, a first filter, a second filter, and a third filter; the radio frequency transceiver, the power amplifier and the antenna switch are sequentially connected, the radio frequency transceiver, the low-noise amplifier and the antenna switch are sequentially connected, the antenna is switched and connected with the antenna, the first filter is located between the radio frequency transceiver and the power amplifier, the second filter is located between the radio frequency transceiver and the low-noise amplifier, and the third filter is located between the antenna switch and the antenna. Through the technical scheme of the utility model local oscillator that appears in can solving the system circuit effectively leaks, certain single frequency point leaks and the multiple stray problem of harmonic etc. makes the system can satisfy authentication demand etc..
Description
Technical Field
The utility model relates to a radio frequency communication technical field especially relates to a radio frequency circuit, wiFi module and electronic equipment.
Background
For electronic products with electromagnetic radiation function, such as mobile phones, WiFi routers and the like, corresponding security certification needs to be performed before the electronic products are put into the market, for example, 3C certification in China and the like. The stray radiation is an important index to be considered in the design process, and when the stray radiation outside the frequency band of one system falls into the receiving frequency band of another system, stray interference is formed. In order to ensure the quality of the product and meet the certification requirement, it is necessary to provide a solution to the various stray problems of the product.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a radio frequency circuit, a WiFi module and an electronic device to overcome the deficiencies in the prior art.
An embodiment of the utility model provides a radio frequency circuit, include: a radio frequency transceiver, a power amplifier, a low noise amplifier, an antenna switch, an antenna, a first filter, a second filter, and a third filter;
the radio frequency transceiver, the first filter, the power amplifier and the antenna switch are connected in sequence, the radio frequency transceiver, the second filter, the low noise amplifier and the antenna switch are connected in sequence, and the antenna switch, the third filter and the antenna are connected in sequence.
In one embodiment, for the rf circuit, first matching networks are disposed between the rf transceiver and the first filter, between the rf transceiver and the second filter, between the power amplifier and the antenna switch, between the low noise amplifier and the antenna switch, and between the antenna switch and the third filter.
In one embodiment, the radio frequency circuit further comprises:
and second matching networks are arranged between the first filter and the power amplifier, between the second filter and the low-noise amplifier and between the third filter and the antenna.
In one embodiment, the first filter and the second filter are the same type of filter, and the filters are in an LC series filtering structure.
In one embodiment, the third filter employs a pi-type LC filter structure.
In one embodiment, the LC series filter structure or the pi-type LC filter structure is an integrated ceramic filter or is composed of discrete inductors and capacitors.
In one embodiment, the first matching network adopts an L-type, T-type or pi-type matching structure.
In one embodiment, the second matching network is an L-type, T-type or pi-type matching structure.
In one embodiment, the impedance of the first matching network and the impedance of the second matching network are both 50 ohms.
The embodiment of the utility model also provides a WiFi module, including foretell radio frequency circuit.
The embodiment of the utility model provides an electronic equipment is still provided, including foretell wiFi module.
The embodiment of the utility model has the following advantage:
the utility model discloses the radio frequency circuit is through increasing corresponding wave filter respectively on the transmission link between radio frequency transceiver and antenna switch and the receiving link to and increase another wave filter between antenna switch and antenna, local oscillator that can appear in the solution system circuit effectively leaks, certain single frequency point leaks and the multiple stray problem of harmonic etc. makes the system can satisfy authentication demand etc.. In addition, impedance matching is performed after each added filter, so that the loss of the circuit line is reduced, and the maximum transmission characteristic is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic structural diagram of the rf circuit of the present invention;
fig. 2 shows another schematic structure of the rf circuit of the present invention;
fig. 3 shows a schematic diagram of an application of the radio frequency circuit of the present invention, which includes three filters;
fig. 4 shows the test result of the radio frequency circuit of the present invention for suppressing the 3.2G frequency point;
fig. 5 shows the test result of suppressing 2.4G frequency multiplication of the rf circuit of the present invention.
Description of the main element symbols:
1-a radio frequency circuit; 110-a radio frequency transceiver; 120-a power amplifier; 130-low noise amplifier; 140-an antenna switch; 150-an antenna; 160-a first filter; 170-a second filter; 180-a third filter; 100-a first matching network; 200-second matching network.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a radio frequency circuit 1, where the radio frequency circuit 1 can be applied to various devices having radio frequency signals, and various stray problems occurring in a system circuit, such as local oscillator leakage, single frequency point leakage, and harmonic, can be effectively solved by the radio frequency circuit 1.
Exemplarily, the radio frequency circuit 1 includes a radio frequency transceiver 110, a Power Amplifier 120, a low noise Amplifier 130, an antenna switch 140, an antenna 150, a first filter 160, a second filter 170, and a third filter 180, wherein the radio frequency transceiver 110, the Power Amplifier (PA) 120, and the antenna switch 140 are sequentially connected to form a transmission link; the radio frequency transceiver 110, a Low Noise Amplifier (LNA) 130 and an antenna switch 140 are connected in sequence to form a receiving chain; the antenna switch 140 is connected to an antenna 150. It will be appreciated that the rf transceiver 110 is primarily configured to modulate baseband signals for transmission via the antenna 150 and to demodulate modulated signals received via the antenna 150 to obtain baseband signals. Generally, the rf transceiver 110 includes a baseband chip, a part of a receiving circuit, a transmitting circuit, and the like.
In this embodiment, the first filter 160 is located between the rf transceiver 110 and the power amplifier 120, the second filter 170 is located between the rf transceiver 110 and the low noise amplifier 130, and the third filter 180 is located between the antenna switch 140 and the antenna 150. It can be understood that the filters arranged at different positions can effectively suppress stray problems such as local oscillator leakage, single frequency point leakage and harmonic waves which may occur in the radio frequency circuit 1.
The first filter 160 and the second filter 170 are mainly used to suppress a single frequency point, which may include local oscillator signals and some special frequency points. And the third filter 180 is mainly used to suppress harmonic signals. Illustratively, the first filter 160 and the second filter 170 may employ the same type of filter, for example, both may employ an LC series filter structure, or may also employ an L-type LC filter structure, etc. And the third filter 180 may adopt a pi-type LC filter structure, or the like, exemplarily.
It should be understood that the values of the inductance L and the capacitance C in the first filter 160 and the second filter 170 need to be selected according to the frequency points that need to be suppressed actually. The relationship between the frequency point f and the inductance L and the capacitance C is as follows:
by adjusting the values of the inductor L and the capacitor C, the suppression and attenuation of different frequency points can be realized, so that the stray interference signals generated by a baseband part, such as local oscillator leakage and leakage of certain single frequency points, can be effectively solved, and the system can meet the authentication requirements and the like. For the third filter 180 with pi-type filtering structure, it can be considered as composed of a C-type filter and LThe C filter is combined, and similarly, the frequency point of the C filter has the same relationship with the inductor and the capacitor.
Exemplarily, the three filters in the radio frequency circuit 1 may adopt integrated ceramic filters, or may adopt discrete filters composed of discrete inductors and capacitors, and preferably, the three filters in the radio frequency circuit 1 adopt a discrete filter structure, so that when different frequency points need to be suppressed, replacement of the inductors and capacitors in the filters can be conveniently achieved.
Typically, for a radio frequency circuit 1 not provided with the three filters, it has corresponding matching chains in both the transmit chain and the receive chain to maximize the transmission efficiency between the respective input and output. Generally, corresponding matching networks are disposed between the rf transceiver 110 and the power amplifier 120, between the rf transceiver 110 and the low noise amplifier 130, between the power amplifier 120 and the antenna switch 140, between the low noise amplifier 130 and the antenna switch 140, and between the antenna switch 140 and the antenna 150.
The matching networks of the rf circuit 1, which are not provided with the three filters, are referred to herein as the first matching network 100, so that the matching networks can be better distinguished from the additional matching networks mentioned later. It is understood that each first matching network 100 may be impedance matched according to different impedance requirements. Typically, in WiFi radio frequency signals, an impedance match of 50 ohms may be employed. Each first matching network 100 may exemplarily adopt an L-type, T-type, or pi-type matching structure, and may specifically realize the required impedance through a capacitor, an inductor, and the like.
In an embodiment, if the first matching network 100 is located between the rf transceiver 110 and the power amplifier 120, the additional first filter 160 may be located between the rf transceiver 110 and the first matching network 100, as shown in fig. 2, or between the first matching network 100 and the power amplifier 120, which may be set according to actual requirements, and is not limited herein. Similarly, the second filter 170 may be located between the rf transceiver 110 and the first matching network 100, or between the first matching network 100 and the low noise amplifier 130; the third filter 180 may be located between the antenna switch 140 and the first matching network 100, or between the first matching network 100 and the antenna 150.
Considering that the line transmission performance of the circuit may be affected by adding the three filters, for this reason, on the basis of adding the three filters, the radio frequency circuit 1 further adds a plurality of second matching networks 200, and the second matching networks 200 are used for reducing the transmission loss of the line to achieve the maximum transmission characteristic.
In one embodiment, as shown in fig. 2, if three filters are respectively disposed behind the corresponding first matching networks 100, the rf circuit 1 further includes: and a second matching network 200 between the first filter 160 and the power amplifier 120, between the second filter 170 and the low noise amplifier 130, and between the third filter 180 and the antenna 150, respectively.
Illustratively, the second matching network 200 may also employ a matching structure such as an L-type, T-type, or pi-type matching structure, for example, for WiFi rf signals, the matching impedance of the second matching network 200 may also be 50 ohms. It will be appreciated that the addition of the second matching network 200 can minimize transmission line losses between the corresponding signal terminal and the added filter terminal in the rf circuit 1, thereby achieving maximum transmission efficiency.
Taking a practical WiFi rf circuit as an example, as shown in fig. 3, the WiFi rf circuit includes a first filter 160 adopting a filter structure with an inductor L1 and a capacitor C1 connected in series, a second filter 170 obtained by connecting an inductor L2 and a capacitor C2 in series, and a third filter 180 adopting a pi-type filter structure (including an inductor L3 and a capacitor C4 of C3), and both front and rear ends of the first filter 160 are matched with corresponding 50-ohm impedances (not shown). The first filter 160 and the second filter 170 are mainly used to suppress a single frequency point of 3.2G, and the third filter 180 is mainly used to suppress a frequency multiplication of 2.4G, such as harmonics of 4.8G. FIG. 4 shows the test results for the first filter 160 (or the second filter 170); fig. 5 shows the test results of the third filter 180. As can be seen from the figure, for the baseband part, the first filter 160 and the second filter 170 can perform good attenuation suppression on the 3.2G frequency point spurious signals; while for the antenna part, the third filter 180 can effectively suppress the 2.4G multiplied frequency signal.
The utility model discloses radio frequency circuit sets up the wave filter of different grade type respectively through the different positions to probably producing stray interference to the realization is suppressed the stray signal at different frequency points, especially in authentication process, can make the signal of different frequencies can not produce stray interference, thereby guarantees product quality etc..
The utility model discloses still provide a wiFi module, this wiFi module includes above-mentioned embodiment 1's radio frequency circuit 1, and this wiFi module that has this radio frequency circuit structure can guarantee to satisfy corresponding authentication requirement when realizing the wiFi function. It is understood that the WiFi module refers to an integrated module for implementing a radio frequency function, and may be sold as a separate circuit module. The options of embodiment 1 described above are also applicable to the WiFi module, and therefore, the description thereof will not be repeated.
The utility model also provides an electronic equipment, this electronic equipment include above-mentioned embodiment 1's radio frequency circuit, exemplarily, this electronic equipment can include but not limited to do, mobile communication terminal, network management terminal to and intelligent household electrical appliances etc.. The mobile communication terminal can comprise a mobile phone, a tablet, a computer and the like; the network management terminal can be a WiFi router, a gateway and the like; the intelligent household appliance can be a Bluetooth, an air conditioner, a washing machine, a television and the like with WiFi connection and control functions. It is understood that the electronics generator may be any WiFi product that is WiFi capable.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A radio frequency circuit, comprising: a radio frequency transceiver, a power amplifier, a low noise amplifier, an antenna switch, an antenna, a first filter, a second filter, and a third filter;
the radio frequency transceiver, the first filter, the power amplifier and the antenna switch are connected in sequence, the radio frequency transceiver, the second filter, the low noise amplifier and the antenna switch are connected in sequence, and the antenna switch, the third filter and the antenna are connected in sequence.
2. The RF circuit of claim 1, wherein a first matching network is disposed between the RF transceiver and the first filter, between the RF transceiver and the second filter, between the power amplifier and the antenna switch, between the low noise amplifier and the antenna switch, and between the antenna switch and the third filter.
3. The radio frequency circuit of claim 2, further comprising: and second matching networks are arranged between the first filter and the power amplifier, between the second filter and the low-noise amplifier and between the third filter and the antenna.
4. The radio frequency circuit according to claim 1, wherein the first filter and the second filter are of the same type, and the filters are of an LC series filter structure.
5. The RF circuit of claim 4, wherein the third filter employs a pi-type LC filter structure.
6. The RF circuit of claim 5, wherein the LC series filter structure or the pi-type LC filter structure is an integrated ceramic filter or is composed of discrete inductors and capacitors.
7. The RF circuit of claim 3, wherein the first matching network or the second matching network is configured as an L-type, T-type, or pi-type matching structure.
8. The radio frequency circuit according to claim 3 or 7, wherein the impedances of the first and second matching networks are each 50 ohms.
9. A WiFi module comprising a radio frequency circuit as claimed in any one of claims 1 to 8.
10. An electronic device comprising the radio frequency circuit of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021438724.1U CN212258955U (en) | 2020-07-20 | 2020-07-20 | Radio frequency circuit, WiFi module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021438724.1U CN212258955U (en) | 2020-07-20 | 2020-07-20 | Radio frequency circuit, WiFi module and electronic equipment |
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| CN212258955U true CN212258955U (en) | 2020-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023185307A1 (en) * | 2022-03-30 | 2023-10-05 | 华为技术有限公司 | Radio-frequency front-end device and signal processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023185307A1 (en) * | 2022-03-30 | 2023-10-05 | 华为技术有限公司 | Radio-frequency front-end device and signal processing method |
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