CN211127801U - Transceiver circuit, wireless communication device, and display device - Google Patents

Abstract

The utility model provides a transceiver circuit, a wireless communication device and a display device, wherein a first capacitive module, a second capacitive module and a third capacitive module are connected in series; the first capacitive module, the second capacitive module, the third capacitive module and the fourth capacitive module not only realize the function of the antenna, but also realize the filtering function, so that a huge clearance area occupied by an antenna part can be saved. Specifically, the coupling effect of the radio frequency signal and the ground is realized through the first capacitive module and the fourth capacitive module, so that a current effect is formed, and electromagnetic radiation energy is generated. The first capacitive module, the second capacitive module and the third capacitive module are connected in series to realize frequency control, so that the filtering effect is achieved. So that a small-sized transceiver circuit can be obtained.

Description

Transceiver circuit, wireless communication device, and display device

Technical Field

The utility model relates to a circuit field especially relates to a transceiver circuit, wireless communication device and display device.

Background

With the development of display devices such as televisions, wireless communication based on bluetooth and wireless fidelity (WIFI) can be gradually implemented in a television box. When the WIFI is used for an 11b/g transceiver, the bandwidth of a transmitted signal is about 20MHz, the occupied interval in practical application can be 25MHz, and signal transmission is carried out on one channel of at most 3 non-overlapping channels; bluetooth uses frequency hopping to hop at 1600 hops per second over 79 channels with 1MHz bandwidth, so bluetooth and WIFI transmitters collide over a wide range.

For example, fig. 1 shows a possible transceiver circuit including an antenna and a filter circuit, and as shown in fig. 1, the existing filter circuit is disposed at the rear end of the antenna 100, and the filtering purpose is achieved by generally achieving suppression of the second harmonic or the third harmonic through pi-type filtering of C L C type, and as shown in fig. 1, CON4 is an antenna, R is an impedance matching circuit, and C L C constitutes a filter circuit for the second harmonic and the third harmonic.

However, the transceiver circuit composed of the antenna and the filter circuit in the prior art has a large size and cannot meet the current small-size design requirement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a transceiver circuit for a small, and can realize antenna and filtering function's transceiver circuit is provided.

In a first aspect, the present invention provides a transceiver circuit, including:

the capacitive module comprises a first capacitive module, a second capacitive module, a third capacitive module and a fourth capacitive module;

the first, second and third capacitive modules are connected in series;

wherein one end of the first capacitive module, one end of the second capacitive module, and one end of the fourth capacitive module are connected;

the other end of the first capacitive module is used for inputting signals;

one end of the third capacitive module is connected with the other end of the second capacitive module;

the other end of the third capacitive module and the other end of the fourth capacitive module are grounded.

Optionally, the first capacitive module, the second capacitive module, the third capacitive module, and the fourth capacitive module at least include a capacitor.

In a second aspect, the present invention provides a wireless communication device, comprising: one layer of signal; the signal layer comprises one or more transceiver circuits as described in any one of the first aspects.

Optionally, the signal layer further comprises a radio frequency circuit connected to the transceiver circuit, and the radio frequency circuit comprises a capacitive-inductive L C filtering module.

Optionally, the L C filtering module includes a first inductive module and a fifth capacitive module;

one end of the first inductive module is connected with the signal input end of the radio frequency circuit;

the other end of the first inductive module is connected with one end of the fifth capacitive module;

the other end of the fifth capacitive module is connected with the other end of the first capacitive module.

Optionally, the L C filtering module further comprises a second, a third, a fourth and a fifth inductive module;

wherein the second, third and first perceptual modules are connected in an П -type filtering structure;

the fourth inductive module, the fifth inductive module and the fifth capacitive module are connected to form a П type filter structure.

Optionally, the wireless communication apparatus further includes: a signal second layer; the signal second layer comprises a Universal Serial Bus (USB) interface, and a first resistor is connected in series in a positive data line interface of the USB interface;

and a second resistor is connected in series in a negative data line interface of the USB interface.

Optionally, the signal layer two further comprises a power supply;

the power supply is connected with the radio frequency circuit.

Optionally, the signal layer includes two of the transceiver circuits and two of the radio frequency circuits.

In a third aspect, an embodiment of the present invention further provides a display device, which includes: a display screen, a loudspeaker, a transmission wire and the wireless communication device according to any one of the second aspect, wherein the transmission wire is connected with the display screen and the wireless communication device respectively;

the display screen is used for presenting an image picture according to the signal of the wireless communication device;

the loudspeaker is used for reproducing sound.

The embodiment of the application provides a transceiver circuit, wireless communication device and display device, and the transceiver circuit includes: the capacitive module comprises a first capacitive module, a second capacitive module, a third capacitive module and a fourth capacitive module; the first capacitive module, the second capacitive module and the third capacitive module are connected in series; one end of the first capacitive module, one end of the second capacitive module and one end of the fourth capacitive module are connected; the other end of the first capacitive module is used for inputting signals; one end of the third capacitive module is connected with the other end of the second capacitive module; the other end of the third capacitive module and the other end of the fourth capacitive module are grounded. In the above device, the first capacitive module, the second capacitive module, the third capacitive module and the fourth capacitive module not only realize the function of the antenna, but also realize the filtering function, so that a huge clearance area occupied by the antenna part can be saved. Specifically, the coupling effect of the radio frequency signal and the ground is realized through the first capacitive module and the fourth capacitive module, so that a current effect is formed, and electromagnetic radiation energy is generated. The first capacitive module, the second capacitive module and the third capacitive module are connected in series to realize frequency control, so that the filtering effect is achieved. So that a small-sized transceiver circuit can be obtained.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the related art, the drawings required for the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic diagram of a conventional antenna structure;

fig. 2 is a schematic structural diagram of a transceiver circuit provided in the present invention;

fig. 3 is a schematic diagram of a filtering effect of the transceiver circuit provided by the present invention;

FIG. 4 is a schematic diagram of a PCB of a conventional antenna;

fig. 5 is a schematic diagram of a PCB of a transceiver circuit provided by the present invention;

fig. 6 is a schematic structure of a radio frequency circuit provided by the present invention;

fig. 7 is a schematic structure of another rf circuit provided by the present invention;

fig. 8 is a schematic structure of a USB port circuit provided in the present invention;

fig. 9 is a schematic diagram of a PCB of a signal layer of the wireless communication device provided by the present invention;

fig. 10 is a schematic diagram of a PCB of a signal layer of a wireless communication device according to the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

First, the words in the embodiments of the present application will be described.

The connection described in the embodiments of the present application may include: the connection is realized by a wire, an electromagnetic or electric device, and the like, and current can flow between two connected devices or electric signals can be transmitted.

The capacitive module described in the embodiment of the application has the capacitance characteristics of blocking direct current and alternating current, filtering, charging and discharging and the like. For example, the capacitive module may be a capacitor, a capacitor component, or a chip, a device, etc. capable of implementing a similar function to the capacitor, which is not specifically limited in this embodiment of the application.

The inductive electric device described in the embodiment of the present application may be an inductor, an inductor component, or a chip, a device, etc. capable of implementing a similar function to the inductor, which is not specifically limited in the embodiment of the present application.

The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 2 is a schematic structural diagram of a transceiver circuit according to the present invention. As shown in fig. 2, the transceiver circuit includes: a first capacitive module 21, a second capacitive module 22, a third capacitive module 23 and a fourth capacitive module 24. Said first capacitive module 21, said second capacitive module 22 and said third capacitive module 23 are connected in series;

wherein one end of the first capacitive module 21, one end of the second capacitive module 22, and one end of the fourth capacitive module 24 are connected; the other end of the first capacitive module 21 is used for inputting a signal ANT; one end of the third capacitive module 23 is connected with the other end of the second capacitive module 22; the other end of the third capacitive module 23 and the other end of the fourth capacitive module 24 are grounded.

In this embodiment, the first capacitive module 21, the second capacitive module 22, the third capacitive module 23, and the fourth capacitive module 24 not only realize the function of the antenna, but also realize the function of filtering, so that a huge clearance area occupied by the antenna part can be omitted.

Specifically, the first capacitive module 21 and the fourth capacitive module 24 realize the coupling effect of the radio frequency signal and the ground, and form a current effect, thereby generating electromagnetic radiation energy. The first capacitive module 21, the second capacitive module 22 and the third capacitive module 23 are connected in series to realize frequency control, so that a filtering effect is achieved.

The specific working principle is as follows:

the first capacitive module 21 and the fourth capacitive module 24 implement coupling control, and the first capacitive module 21, the second capacitive module 22 and the third capacitive module 23 implement frequency control.

In the coupling control, possible formulas may be:

wherein J is a current source, M is a magnetic current source, omega 1 is an antenna frequency, and omega 2 is a feed frequency.

According to equation (1), increasing M enhances coupling, and the magnetic current source Ms can also be placed in the region of the ground plane where the magnetic field is largest to enhance magnetic coupling. The feed mechanism of the loop ground radiating antenna is considered as a magnetic current source Ms and the optimal feed position of Ms is near the midpoint of the ground plane. Therefore, the position of the Bluetooth antenna can be placed at the edge position of the PCB. The coupling structure is in the middle of the clearance.

According to equation (2), increasing J can enhance coupling, and can also enhance electrical coupling by placing the current source Js in the region of the ground plane where the electric field is largest.

In the frequency control:

according to the above formula, the antenna frequency f can be easily controlled by controlling the inductance L and the capacitance C.

Optionally, in a simpler circuit design, the first capacitive module, the second capacitive module, the third capacitive module, and the fourth capacitive module at least include capacitors, and specific parameters of the capacitors may be selected to be any value between 0.1 and 6.8 pF.

Fig. 3 shows the filtering effect of the transceiver circuit according to the embodiment of the present application on signals in a certain range of frequencies. It can be seen that for signals from 2.0GHZ to 3.0GHZ, a filtering effect of about minus 40dB to minus 35dB can be achieved.

To sum up, an embodiment of the present application provides a transceiver circuit, a wireless communication device and a display device, where the transceiver circuit includes: the capacitive module comprises a first capacitive module, a second capacitive module, a third capacitive module and a fourth capacitive module; the first capacitive module, the second capacitive module and the third capacitive module are connected in series; one end of the first capacitive module, one end of the second capacitive module and one end of the fourth capacitive module are connected; the other end of the first capacitive module is used for inputting signals; one end of the third capacitive module is connected with the other end of the second capacitive module; the other end of the third capacitive module and the other end of the fourth capacitive module are grounded. In the above device, the first capacitive module, the second capacitive module, the third capacitive module and the fourth capacitive module not only realize the function of the antenna, but also realize the filtering function, so that a huge clearance area occupied by the antenna part can be saved.

Specifically, the coupling effect of the radio frequency signal and the ground is realized through the first capacitive module and the fourth capacitive module, so that a current effect is formed, and electromagnetic radiation energy is generated. The first capacitive module, the second capacitive module and the third capacitive module are connected in series to realize frequency control, so that the filtering effect is achieved. So that a small-sized transceiver circuit can be obtained.

In a specific application, the transceiver circuit of the embodiment of the present application may be applied to a wireless communication device as an antenna.

When the transceiver Circuit of the embodiment of the application is applied to a wireless communication device, the wiring size of a rigid Circuit Board (PCB) can be saved to a greater extent.

For example, fig. 4 is a schematic diagram of PCB traces of a conventional antenna.

The antenna portion 41 is typically implemented using the principles of optical wave transmission. The principle of PCB board mounted antennas is 1/4 λ or 1/2 λ of the wavelength of light, usually the shortest length:

1/4λ/f＝1/4×300000/2400000＝1/4×0.125＝0.03125m＝31.25mm

wherein λ is the wavelength of light wave and f is the signal frequency.

Typically such antennas 41 require a headroom of at least 20x6mm on the PCB board.

Fig. 5 is a schematic diagram of a PCB routing of the transceiver circuit according to the embodiment of the present application. Take the first capacitive module as C91, the second capacitive module as C92, the third capacitive module as C93, and the fourth capacitive module as C95 as an example.

The transmit receive circuit 51 antenna clearance area of fig. 5 is 6x3mm, which is about 1/3 of the conventional PCB board mounted antenna of fig. 4.

Moreover, the efficiency of the antenna composed of the transceiving circuit is much higher than that of the existing PCB on-board antenna. In the experiment, the efficiency of the existing PCB on-board antenna is only about 40%, and the efficiency of the antenna formed by the receiving and transmitting circuit can reach 50% -60%.

Moreover, the directional pattern of the antenna formed by the transceiving circuit is omnidirectional, and a better directional pattern can be obtained in each direction. The existing PCB board-mounted antennas are all monopole antennas, and directional patterns are good only in a certain direction.

The antenna composed of the transceiver circuit of the present application can be used as a filter circuit in addition to an antenna.

With increasingly fierce competition in the WIFI module industry, the existing large-size four-layer-stacked structure cannot meet the requirement of cost reduction of a customer, a small-size module with two layer-stacked structures needs to be designed to improve market competitiveness, but the two layer-stacked structures face a huge problem of interference, namely the problem of interference, and both a power supply and a USB signal can cause interference on radio frequency. Conventional antenna portions require relatively large headroom and are difficult to scale down.

Based on this, the present invention provides a wireless communication device, which can be a two-layer structure, for example, including a signal layer and a signal layer. The first signal layer may be provided with the transceiver circuit of the above-described embodiment, and the second signal layer may be provided with a power supply, etc.

Optionally, the signal layer further comprises a radio frequency circuit connected to the transceiver circuit, and the radio frequency circuit comprises a capacitive-inductive L C filtering module.

Fig. 6 shows a schematic diagram of a radio frequency circuit. The ANT end of the radio frequency circuit is connected with the ANT end of the transceiver circuit.

It can be understood that the television is powered by external 220V, converted from ac to dc, and converted from dc to 3.3V to power the module, in the process, noise of external circuit may be introduced, so that interference of power supply is large, and since the module is a two-layer structure, only one layer of FR-4 substrate is between the power supply and the rf signal, which is very close to each other, and is easy to generate coupling effect, the rf circuit including L C filter module 61 can effectively suppress interference of power supply.

Optionally, the L C filtering module 61 includes a first inductive module 610 and a fifth capacitive module 611, wherein one end of the first inductive module is connected to the signal input terminal of the radio frequency circuit, the other end of the first inductive module is connected to one end of the fifth capacitive module, and the other end of the fifth capacitive module is connected to the other end of the first capacitive module.

It should be noted that, a general radio frequency circuit includes the first inductive module 610, and therefore, the fifth capacitive module 611 may be added to the radio frequency circuit in the embodiment of the present application, so that interference of the power supply may be effectively suppressed. The range of the fifth capacitive module 611 may be controlled between 1-15pF, for example 10 pF.

Optionally, the L C filtering module 61 further comprises a second perceptual module 612, a third perceptual module 613, a fourth perceptual module 614, and a fifth perceptual module 615;

the second, third and first inductive modules 612, 613 and 610 are connected in an П type filtering structure, and the fourth, fifth and fifth inductive modules 614, 615 and 611 are connected in a П type filtering structure, so that more effective filtering can be achieved.

Optionally, in the wireless communication device according to the embodiment of the present application, the signal layer includes two of the transceiver circuits and two of the radio frequency circuits. Therefore, when one of the radio frequency circuit and the transceiver circuit has poor effect, the other radio frequency circuit and the other transceiver circuit can be adopted.

Illustratively, fig. 7 shows a circuit schematic as the primary radio frequency circuit. Different from the rf circuit in fig. 6, in fig. 7, another rf line 71 is added, and the added line is a content in the prior art and is used for enhancing a main rf signal according to devices such as a capacitor and an inductor, and details are not repeated herein.

Optionally, the wireless communication apparatus further includes: a signal second layer; the signal second layer comprises a Universal Serial Bus (USB) interface, and a first resistor is connected in series in a positive data line interface of the USB interface; and a second resistor is connected in series in a negative data line interface of the USB interface.

Fig. 8 shows a circuit schematic diagram of a serial circuit of USB interfaces, in which a first resistor 51 is connected in series in a positive data line interface USBDM of a USB interface, and a second resistor 52 is connected in series in a negative data line interface USBDP of a USB interface, and then the first resistor 51 and the second resistor 52 may respectively form an RC filter circuit with their own capacitors in the USB interface, so as to reduce the interference between USB signals and radio frequency circuits.

Optionally, the signal layer two further comprises a power supply; the power supply is connected with the radio frequency circuit, so that the power supply can supply power to the radio frequency circuit.

For example, fig. 9 shows a schematic PCB diagram of a signal layer of a wireless communication device with a two-layer structure according to an embodiment of the present application, and fig. 10 shows a schematic PCB diagram of a signal layer of a wireless communication device with a two-layer structure according to an embodiment of the present application, which will not be repeated herein for devices and circuits specifically included in the signal layer and the signal layer.

The embodiment of the application also provides a display device, which comprises a display screen, a loudspeaker, a transmission wire and the wireless communication device, wherein the transmission wire is respectively connected with the display screen and the wireless communication device; the display screen is used for presenting an image picture according to the signal of the wireless communication device; the loudspeaker is used for reproducing sound. The display device may be a television or the like, and the display device is not limited in this embodiment of the application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A transceiver circuit, comprising:

the capacitive module comprises a first capacitive module, a second capacitive module, a third capacitive module and a fourth capacitive module;

the first, second and third capacitive modules are connected in series;

wherein one end of the first capacitive module, one end of the second capacitive module, and one end of the fourth capacitive module are connected;

the other end of the first capacitive module is used for inputting signals;

one end of the third capacitive module is connected with the other end of the second capacitive module;

the other end of the third capacitive module and the other end of the fourth capacitive module are grounded.

2. The transceiver circuit of claim 1, wherein the first capacitive module, the second capacitive module, the third capacitive module, and the fourth capacitive module comprise at least a capacitor.

3. A wireless communications apparatus, the wireless communications apparatus comprising: one layer of signal; the signal layer comprises one or more transceiver circuits as claimed in any one of claims 1 or 2.

4. The wireless communication device of claim 3, wherein the signal layer further comprises a radio frequency circuit connected to the transceiver circuit, wherein the radio frequency circuit comprises an L C filter module.

5. The wireless communication device of claim 4, wherein the L C filtering module comprises a first inductive module and a fifth capacitive module;

one end of the first inductive module is connected with the signal input end of the radio frequency circuit;

the other end of the first inductive module is connected with one end of the fifth capacitive module;

the other end of the fifth capacitive module is connected with the other end of the first capacitive module.

6. The wireless communication device of claim 5, wherein the L C filtering module further comprises a second, a third, a fourth and a fifth inductive module;

wherein the second, third and first perceptual modules are connected in an П -type filtering structure;

the fourth inductive module, the fifth inductive module and the fifth capacitive module are connected to form a П type filter structure.

7. The wireless communication device according to any of claims 3-6, wherein the wireless communication device further comprises: a signal second layer; the signal second layer comprises a Universal Serial Bus (USB) interface, and a first resistor is connected in series in a positive data line interface of the USB interface;

and a second resistor is connected in series in a negative data line interface of the USB interface.

8. The apparatus of claim 7, wherein the signal two layer further comprises a power supply;

the power supply is connected with the radio frequency circuit.

9. The wireless communication device according to any of claims 4-6, wherein the signal layer comprises two of the transceiver circuits and two of the radio frequency circuits.

10. A display device, comprising: a display screen, a speaker, a transmission conductor and the wireless communication device according to any one of claims 3-9, wherein the transmission conductor is connected to the display screen and the wireless communication device, respectively;

the display screen is used for presenting an image picture according to the signal of the wireless communication device;

the loudspeaker is used for reproducing sound.

Images