KR20140025208A - Wilkinson power divider/combiner having a stub members - Google Patents

Abstract

The present invention provides an input port member for inputting at least one high frequency signal; At least two first and second output port members formed to divide and output the high frequency signal inputted to the input port; A resistor connected between the first output port member and the second output port member to perform a resistance action; Provided is a Wilkinson power distribution and synthesis apparatus comprising a stub member having an inductor function respectively mounted on pads formed at both ends of the resistor to remove parasitic capacitance generated at both ends of the resistor.
The present invention as described above, by removing the parasitic capacitance generated from the resistance across the power distribution by mounting a short stub having an inductor on the resistance pad of the Wilkins power distribution and synthesis device, the Wilkinson power distribution and synthesis device at high frequency Even if used, the increased parasitic capacitance can be eliminated, so that a high performance power distribution / synthesis device can be manufactured despite the use of a large resistor, thereby significantly improving the efficiency of power distribution / synthesis device. There is.

Description

Wilkinson power divider / combiner having a stub members}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Wilkinson power distribution and synthesis device, and in particular, a parasitic capacitance generated from both ends of a power distribution by mounting a short or open stub having an inductor performance on a pad across the resistance of the Wilkins power distribution and synthesis device. ), A Wilkinson power distribution and synthesis device that significantly improves the efficiency of use of the power distribution / synthesis device.

        2. Description of the Related Art Generally, a power divider for distributing high frequency power to multiple output ports and a power combiner for synthesizing high frequency power input to multiple ports and outputting them to one port are widely used in ultra-high frequency systems. Such a power divider is used to distribute a very high frequency signal output from one signal source to a plurality of necessary portions at a constant ratio, and a power synthesizer combines the ultra high frequency signals output from several signal sources or amplifiers to form a single antenna or Used to synthesize the output. As a device, it operates to function as both a power synthesizer and a divider. Here, an example of such a power divider / synthesizer is an N-Way Wilkinson power divider proposed by 'Wilkinson', where N is an integer greater than one. A basic configuration of an N-branch Wilkinson power divider has an input port for inputting at least one high frequency signal and two or more output ports for distributing and outputting the high frequency signal inputted to the input port. Such a configuration can be manufactured in various forms, but a typical example is composed of a micro strip line or a coaxial transmission line.

The prior art related to the sprinkler as described above is disclosed in Korean Patent Application Publication No. 10-2009-0121898 filed by Kyungsung University Industry-Academic Cooperation Agency (Invention: Tunable Wilkinson Power Distribution Synthesizer; Publication Date: November 2009 26 days) is known.

Then, referring to the conventional Wilkinson power distribution / synthesis apparatus as described above with reference to FIG. 1, the basic configuration of the N-branch Wilkinson power divider includes an input port 70 for inputting one high frequency signal; And one or more output ports 71A-D for distributing and outputting a high frequency signal input to the input port 70.

On the other hand, the operation of the conventional Wilkinson power distribution / synthesis device, first, when the ultra-high frequency signal is input to the input port 70 as described above is input to one node of the line converter (74A-D) and the branch occurs.

In this case, the length of the line converters 74A-D is λ / 4, and the impedance value is. Where λ represents the wavelength of the signal at the operating frequency, and Z0 is the system impedance, and most of the time, approximately 50 Ω is used in the microwave communication. In addition, resistances of 50 Ω are commonly connected to the common nodes of the N other nodes 72 of the line converters 74A-D. This resistor 73 has a function for minimizing the isolation characteristics between the output ports and the reflection coefficient at the output port.

      However, in the conventional Wilkinson power distribution / synthesis device as described above, the frequency of the resistor should be smaller as the frequency increases. In this case, if the size of the resistor remains the same, the influence of parasitic capacitance will increase. There is a problem that performance, for example, degrades matching, power loss and isolation characteristics.

Therefore, the present invention was invented to solve the above problems of the prior art, even if the Wilkinson power distribution and synthesis device is used at high frequencies, because it can eliminate the influence of the increased parasitic capacitance, even in the use of a large resistor Nevertheless, it is an object of the present invention to provide a Wilkinson power distribution and synthesis apparatus capable of manufacturing a high performance power distribution / synthesis apparatus.

It is still another object of the present invention to provide a Wilkinson power distribution and synthesis apparatus which optimally removes parasitic capacitance generated according to a high frequency signal because a stub having an inductor performance is manufactured by variously setting a wavelength length according to a frequency. It is.

The present invention for achieving the above object is an input port member for inputting at least one high frequency signal;

     At least two first and second output port members formed to divide and output the high frequency signal inputted to the input port;

     A resistor connected between the first output port member and the second output port member to perform a resistance action;

Provided is a Wilkinson power distribution and synthesizing apparatus equipped with a stub member comprising a stub member each mounted on a pad formed at both ends of the resistor to remove parasitic capacitance generated at both ends of the resistor.

According to the present invention as described above, Wilkinson power distribution and synthesis by removing the parasitic capacitance generated from the resistance across the power distribution by mounting a short or open stub having an inductor performance on the pad across the resistance of the Wilkins power distribution and synthesis device Even if the device is used at a high frequency, the increased parasitic capacitance can be eliminated, so that a high performance power distribution / synthesis device can be manufactured despite the use of a large resistor, thereby improving the efficiency of the power distribution / synthesis device. There is a significant improvement.

In addition, the present invention as described above is manufactured by varying the length of the wavelength according to the frequency of the stub having the inductor performance, so the parasitic capacitance generated according to the high frequency signal in the optimal state, so that the power loss and input and output ports accordingly The effect is to minimize the reflection of the signal at.

1 is an explanatory diagram for explaining a conventional Wilkinson power distribution / synthesis device.
2 is an explanatory diagram schematically illustrating a structure of a Wilkinson power distribution / compositing apparatus of the present invention.
3 is an explanatory diagram equivalently illustrating a Wilkinson power distribution / synthesis device of the present invention.
Figure 4 is an explanatory diagram schematically illustrating the equivalent principle of removing the parasitic capacitance of the stub member in the device of the present invention.
5 is an explanatory view showing a state in which a stub member is not mounted on the Wilkinson power distribution device.
Figure 6 is a graph comparing the matching characteristics of the apparatus equipped with the stub and the apparatus without the stub.
7 is a graph comparing the 3db characteristics of the apparatus without the stub of the present invention equipped with a stub.
8 is a graph comparing the isolation characteristics of the apparatus of the present invention with a stub and a device without a stub.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The Wilkinson power distribution / synthesis device of the present invention includes an input port member (1) for inputting at least one high frequency signal as shown in Figs.

     At least two first and second output port members (2, 3) formed for distributing and outputting a high frequency signal input to the input port member (1);

     A resistor (4) connected between the first output port member (2) and the second output port member (3) to perform a resistance action;

A stub member (6) having an inductor function (9) mounted on a pad (5) formed at both ends of the resistor (4), respectively, to remove the parasitic capacitance (8) generated at both ends of the resistor (4). It is composed.

      In this case, the resistor 4 may be any resistor including a lumped resistor and a sheet-type resistor.

      And the stub member 6 can be set to, for example, within the case of the short stub, open if the length.

In addition, the stub member 6 may be configured in the form of a chip inductor.

Next, the operation and effect of the apparatus of the present invention constructed as described above will be described.

The action of the Wilkinson power distribution / synthesis device of the present invention is, first, an inductor function on a pad 5 formed at both ends of a resistor 4 connected between the first output port member 2 and the second output port member 3. This stub member 6 is mounted. When the high frequency signal is input to the input port member 1 while the stub member 6 is mounted as described above, the high frequency signal is connected to the first output port member 2 and the second output port member 3. Branched by a resistor (4) formed at both ends of the first and second output port members (3) and distributed or synthesized via the first output port member (2) and the second output port member (3). Is output.

Here, the resistor 4 may use a lumped resistor and a sheet type resistor. In addition, the stub member 6 may be configured in the form of a chip inductor.

At this time, when the high frequency signal is branched through the Wilkinson power distribution / synthesis device 7 of the present invention as described above, the first output port member 2 and the second output port member 3 as shown in FIG. The parasitic capacitance (-jx: 8) is generated by the resistor 4 provided therebetween. However, as described above, the parasitic capacitance (-jx: 8) generated by the resistor 4 has this stub because the stub member 6 provided at both ends of the resistor 4 has an inductor function (+ jx: 9). It is completely removed by the inductor function + jx of the member 6.

Accordingly, if the operating frequency of the Wilkinson power distribution / compositing device 7 of the present invention is changed to a high frequency, the impedance due to parasitic capacitance is also reduced accordingly. Correspondingly, the parasitic capacitance (-jx: 8) generated by the stub member 6 having the inductor function (+ jx: 9) can be removed.

For example, the stub member 6 may be configured as a short stub or an open stub, and the length of the wavelength should be smaller than λ / 4, and the meaning of short in the stub member 6 is via hole (not shown). It means to connect the ground to ground. And the open stub of the stub member 6 has a size of λ / 4 ~ λ / 2, it can serve as a short stub without connecting to the ground by using a via hole. However, since the stub member 6 performs the same function, depending on whether the short or open is connected to the ground, the stub member 6 may use either a short or an open according to the Wilkinson power distribution / composite design.

On the other hand, the Wilkinson power distribution / synthesis device 7 of the present invention as described above has obtained the experimental data as shown in Figs.

That is, the Wilkinson power distribution / synthesis device shown in FIG. 5 is without the stub member of the present invention as in the prior art (see "A" in FIGS. 5 to 7), and FIG. 3 is equipped with the stub of the present invention. 1 shows a device 7 (see "B" in Figs. 5 to 7).

At this time, a diagram comparing the state in which the stub member is not mounted to the Wilkins power distribution device and the state in which the stub member is mounted is a graph shown in FIGS. 6 to 8. First, as shown in FIG. It can be seen that the matching characteristic curve is further lowered and clearly improved compared to when the stub member is not mounted. In addition, in FIG. 7, it can be seen that when the stub member is mounted as in the present invention, it is closer to 3db and the bandwidth is wider than when the stub member is not mounted. Furthermore, as shown in FIG. 8, it can be seen that the isolation characteristic is improved when the stub member is mounted as in the present invention when the graph shape is further lowered than when the stub member is not mounted.

1: input port member 2: first output port member
3: second output port member 4: resistor
5: resistance pad 6: stub member
7: Wilkinson power distribution / synthesis device 8: Parasitic capacitance
9: inductor

Claims (5)

An input port member for inputting at least one high frequency signal;
At least two first and second output port members formed to divide and output the high frequency signal inputted to the input port;
A resistor connected between the first output port member and the second output port member to perform a resistance action;
And a stub member mounted on a pad formed at both ends of the resistor, the stub member having an inductor function for removing parasitic capacitance generated at both ends of the resistor.       The Wilkinson power distribution and synthesis apparatus according to claim 1, wherein the resistor is a chip resistor or sheet resistor. The method of claim 1, wherein the stub member is a short stub when the length of the wavelength
Wilkinson power distribution and synthesizing apparatus equipped with a stub member, characterized in that 0 + n ~ + n (n = 0, 1, 2, 3 ...). The method of claim 1, wherein the stub member is the length of the wavelength when the open stub
Wilkinson power distribution and synthesis device equipped with a stub member, characterized in that + n ~ + n (n = 0, 1, 2, 3 ...).       The Wilkinson power distribution and synthesizing apparatus according to claim 1, wherein the stub member is configured as a chip inductor.

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