CN101409572B - Single or Multiple System Signal Matching Modules - Google Patents

Abstract

A single or multi-system signal matching module can raise the use flexibility of communication module and can also raise the efficiency of its subsystems, and the provided selective matching loop can provide fine-tuning function when the matching element in the module can not be matched, and can utilize said multi-stage matching loop to obtain required quality factor (Q value) and regulate its frequency width.

Description

Single or Multiple System Signal Matching Modules

technical field

The present invention relates to a single or multi-system signal matching module, in particular to a signal matching module set in a single or multi-system module, so that the required matching can be adjusted without reducing performance.

Background technique

In the field of general wireless communication, interference between noise and circuits often occurs in high-frequency communication, which affects the performance of wireless communication, especially the interference caused by the circuit itself. If multiple systems are coupled in a communication module When connecting wireless communication modules such as WiFi, Bluetooth (Bluetooth), Global System for Mobile Communications (GSM), WiMAX (Worldwide Interoperability for Microwave Access) at the same time, more unpredictable interference may occur.

In a wireless communication device equipped with a high-frequency communication module, if there is only a single system, such as only one of WiFi, Bluetooth, Global System for Mobile Communications, and WiMAX, usually the signal can be transmitted or received through a switch (Switch) Or a circulator (Circulator) to switch signal routing.

The relevant technology of the above-mentioned circulator is as the circulator disclosed in the U.S. Patent No. 6,894,562 published on May 17, 2005 for a high-frequency amplifier (High-frequency amplifier). In this example, a frequency divider (divider) is used to divide An input high-frequency signal is split into two output signals, and then a circulator is used to adjust the amplification effect. In the example shown in Figure 1, the high-frequency signal is fed in from the input terminal 1 and output from the output terminal 2. In this example, the frequency divider 3 divides the high-frequency signal fed in from the input terminal 1 into two signal directions, where One way passes through a main amplifying unit 4, the other way passes through another secondary amplifying unit 5, and then a circulator 6 is provided to transmit the high-frequency signal delivered from the secondary amplifying unit 5 to the output end of the main amplifying unit 4, In the direction shown by the dotted line in the figure, then the high-frequency signal output by the main amplifying unit 5 is transferred to the output terminal 2 for output, in the direction shown by the solid line in the figure. Thereby the circulator 6 produces different signal amplification effects.

In the related art, in a module with multiple wireless communication subsystems, the above-mentioned switcher is often used to switch communication signals between different subsystems, as shown in FIG. 2 , which is a schematic diagram of a multi-subsystem communication module. This communication device includes two communication modules such as a first communication module 25 and a second communication module 26, wherein the first communication module 25 uses a bidirectional transmission line to perform reception and transmission (RX/TX), and the second communication module 26 A transmission line (RX) for receiving signals and a transmission line (TX) for transmitting signals are used. These two communication modules use a coupler (coupler) 22 to couple the receiving/transmitting transmission line of the first communication module 25, and the second The receiving transmission line of the second communication module 26 is thereby isolated from other signals, and the transmission direction of each signal is allocated. Next, the signal distributed by the coupler 22 and the transmission signal of the second communication module 26 are switched by the switcher 20 , and finally coupled to the antenna 21 to transmit and receive each signal.

In the example of Fig. 2, the first communication module 25 can be a bluetooth communication module (Bluetooth), and it has the characteristics of using a transmission line to transmit and receive and transmit signals bidirectionally, and the second communication module 26 can be a WiFi module, this has The characteristics of dividing the transmitted and received signals into two transmission lines, through the switcher 20, the signals received by the antenna 21 are switched to each communication module according to the type, and then guided to each communication module through the coupler 22, and vice versa, by The signals transmitted by each communication module are transmitted by the antenna 21 through the coupler 22 and the switch 20 .

With the vigorous development of the technology industry, a module may contain several subsystems, including wireless communication systems such as the above-mentioned WiFi, Bluetooth (Bluetooth), Global System for Mobile Communications (GSM) and WiMAX. However, in the above-mentioned multi-subsystem module, when these subsystems operate at the same time, it is very likely to interfere with another system, especially under the consideration of space and cost, the input and output ports (I/O ports) of each subsystem Port) may only be designed with a shared port, so the communication performance of this communication module will decrease without special design.

Contents of the invention

In the above-mentioned commonly used multi-subsystem communication module at present, in view of the use of a shared port (port) in the prior art, which will cause interference between subsystems and further affect communication performance, the present invention proposes a single or multi-system signal The matching module can achieve the effect that multiple or single input and output ports can use the communication module more flexibly without changing the existing communication module parts and circuits.

In addition, the above-mentioned single or multi-system signal matching module of the present invention provides an optional matching circuit (optional matching circuit). When the internal matching components of the module cannot achieve the required matching impedance, the external circuit can be used to perform the matching. Fine-tuning; if the internal components of the module can be adjusted to the required matching impedance, the selective matching circuit can use multi-order matching to achieve the required quality factor (Q value), so that the matching can adjust its bandwidth.

The preferred embodiment of the single or multi-system signal matching module of the present invention is used in a single or multi-subsystem communication module, wherein there is a unit cell (unit cell) to connect one or more subsystems, the unit cell at least includes mutual The connected electronic components or transmission lines can connect external communication signals through a pair of external communication ports set outside the matching module, and provide an adjustment interface for the internal circuit, so the connected electrical equipment will not be connected to this module. The extra load generated by the internal circuit can avoid direct interference or signal loss.

A schematic diagram of an embodiment of a unit element, wherein FIG. 4A shows an embodiment of a unit element without setting an external communication port. The horizontal dotted line represents a reference plane (reference plane) 30, and the bottom of the reference plane 30 is inside a single or multi-system signal matching loop The configuration of the components, especially including the first port P1, the third port P3 and the fourth port P4, can be used to connect with other modules. In the embodiment, different subsystems can be connected, especially the communication system, such as connecting WiFi, Bluetooth (Bluetooth), Global System for Mobile Communications (GSM), UWB (UltraWide Band), DVB (Digital Video Broadcasting), GPS, 3G and WiMAX and other wireless communication systems; in addition, if the reference plane is above 30, there is also a connection to other The second port P2 of the circuit or module. FIG. 4B shows a schematic diagram of another unit element, which has a fifth port P5 , a sixth port P6 and a seventh port P7 , all of which are disposed below the reference plane 30 .

The above-mentioned reference plane 30 can represent the internal circuit and external circuit that separate the single or multi-system signal matching module. In a communication module, if the feed point (Feed point) is set outside, as shown in the second port P2 of FIG. 4A, In this way, a selective matching circuit is electrically connected. When the matching components inside the module cannot achieve the required matching, it can be tested and adjusted externally without causing loss, interference or other effects on the internal circuit; even When the required matching has been obtained inside the module, the selective matching circuit can also use multi-level matching to achieve the required Q value, and the required bandwidth can be adjusted by the effect of this multi-level matching.

According to the embodiment of FIG. 4A, it includes the first port P1, the third port P3 and the fourth port P4 arranged in the internal circuit, and the second port P2 arranged in the outside, and the fifth figure A shows each of the ideal circuits. The curve of insertion loss (Insertion Loss) and frequency (frequency) during signal transmission between ports, in which the insertion loss value of the preset internal circuit is about -3dB. This is a graph expressing S-parameters. S-parameter measurement is an essential tool in the radio frequency (RF) design process to simulate the behavior of electronic components at different frequencies.

Wherein the curve _S43 represents the insertion loss performance of the signal excited by the third port P3 received by the fourth port P4 in a subsystem, since the third port P3 and the fourth port P4 are both internal communication ports, Therefore, the insertion loss of the signal is about -3.01dB of the default value, especially the experiment of the present invention focuses on the frequency band of 2.45GHz (point 1 and point 2).

The curve _S12 shows that the signal excited by another subsystem by the second port P2 outside the circuit is received by the first port P1 inside the circuit, but at the 2.45GHz frequency band represented by point 1, _S12 is in phase Compared with S ₄₃ , it has a better loss value performance, and the ideal experimental value is 0.00dB. From the experimental results, it can be seen that the single or multi-system signal matching module provided by the present invention does have better performance because of the external matching circuit, and will not cause the loss of the internal circuit.

According to the embodiment of Fig. 4B, Fig. 5B shows the curve of insertion loss (Insertion Loss) and frequency (frequency) when signals are transmitted between each port in the ideal circuit, wherein the same preset

If the loss value is controlled at -20dB and the Q value is less than 0.5, the bandwidth performance of about 1.35 GHz can be obtained; and as shown in Figure 9C, this example uses the above-mentioned multi-stage matching loop, and the Q value is controlled at Below 0.5, when the loss value is controlled at -20dB, there is a bandwidth of about 1.9GHz.

It can be seen from experiments that the matching module using the single or multi-system signal of the present invention can flexibly adjust the impedance matching of the entire communication module, so that the required matching can be achieved, and has better bandwidth performance than the matching module not using the present invention , and the use of multi-order matching loops can increase utility.

FIG. 10 is a schematic diagram of an embodiment of the present invention using a multi-system signal matching module, which is a circuit with multiple wireless communication subsystems, including a first communication module 25 and a second communication module 26, using a switch 20 Switch communication signals between different systems, wherein the first communication module 25 uses a bidirectional transmission line to perform reception and transmission (RX/TX), while the second communication module 26 uses a transmission line (RX) for receiving signals and a transmission line Signal transmission line (TX), these two communication modules use a coupler 22 to couple the receiving/transmitting transmission line of the first communication module 25, and the receiving transmission line of the second communication module 26, and use another splitter (splitter) 10 Separate the signals of the two communication modules and assign the transmission direction. Afterwards, the signals are switched by the switcher 20 and coupled to the antenna 21 to transmit and receive each signal. In this example, the multi-system signal matching module provided by the present invention can be applied to the transmission line connected between various electronic components, including the first matching module 101 connected to the transmission line between the shunt 10 and the second communication module 26, The second matching module 102 is connected between the shunt 10 and the first communication module 25 , and the third matching module 103 is connected between the shunt 10 and the coupler 22 . In a preferred embodiment, the above-mentioned first communication module 25 can be a Bluetooth communication module (Bluetooth), which has the characteristics of using a transmission line to transmit and receive signals bidirectionally, and the second communication module 26 can be a WiFi Module, which has the characteristic of splitting the transmitted and received signal into two transmission lines. Embodiments of the present invention are not limited to the above-described embodiments.

To sum up, the present invention discloses a single or multi-system signal matching module. The use of this module can not only improve the flexibility of use of each circuit module, but also improve the performance of each subsystem. In addition, the selection method provided by the present invention The matching circuit can provide a fine-tuning function when the internal matching components of the module cannot achieve the required matching. If the internal matching can be adjusted to the required matching, this multi-level matching circuit can be used to achieve the required Q value and adjust its bandwidth. In addition It can also achieve similar filtering effects through the resonance effect, which is of great help to the design of future modules.

However, the above description is only a preferred feasible embodiment of the present invention, and does not limit the protection scope of the present invention. Therefore, all equivalent structural changes made by using the description of the present invention and the contents of the accompanying drawings are equally included in the present invention. Within the scope of protection, it is hereby explained.

Claims (6)

1. A single or multi-system signal matching module, characterized in that, said module includes: A unit element connecting single or multiple subsystems, the unit element includes a plurality of interconnected electronic elements or transmission lines, wherein a multi-stage matching circuit is formed by connecting multiple unit elements, and the multi-stage signal matching adjustment is used to achieve the desired The required quality factor and bandwidth; One or more communication ports inside the single- or multi-system signal matching module are electrically connected to the unit element for connecting different electronic signal sources; One or more external communication ports of the single or multi-system signal matching module are electrically connected to the unit element, and are one or more external feeding points of the single or multi-system signal matching module; A plurality of connecting terminals for connecting other communication ports, circuits, modules or grounding terminals; Wherein, the single or multi-system signal matching module is connected to an external electronic signal source through the communication port, and provides one or more adjustment interfaces for the internal circuit of the single or multi-system signal matching module, without affecting the single or multi-system signal matching module. The internal circuit of the system signal matching module generates additional load, which can avoid direct interference or signal loss. 2. The single or multi-system signal matching module according to claim 1, wherein the single or multi-system signal matching module is connected to the transmission lines of the electronic components of the communication system. 3. The single or multi-system signal matching module according to claim 1, wherein the external communication port is electrically connected to a selective matching circuit, when the internal matching of the single or multi-system signal matching module When the component cannot achieve the required matching, it can be tested and adjusted externally by the selective matching circuit. 4. A single or multi-system signal matching module, characterized in that, said module includes: A unit element connecting single or multiple subsystems, the unit element includes a plurality of interconnected electronic elements or transmission lines, wherein a multi-stage matching circuit is formed by connecting multiple unit elements, and the multi-stage signal matching adjustment is used to achieve the desired The required quality factor and bandwidth; One or more external and internal communication ports of the single or multi-system signal matching module are electrically connected to the unit components to connect different electronic signal sources; a plurality of connecting terminals for connecting other communication ports, circuits, modules or grounding terminals; and A selective matching loop externally connected to the single or multi-system signal matching module, when the matching components inside the single or multi-system signal matching module cannot achieve the required matching, the selective matching loop can be connected externally Test and adjust without generating additional load on the internal circuit of the single or multi-system signal matching module, and avoiding direct interference or signal loss. 5. The single or multi-system signal matching module according to claim 4, wherein the single or multi-system signal matching module is connected to the transmission lines of the electronic components of a communication system. 6. The single or multi-system signal matching module as claimed in claim 4, wherein the matching module is applied in a communication system, such as WiFi, Bluetooth, GSM, UWB, DVB, GPS, 3G One with WiMAX wireless communication system.

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