CN202997026U - 3db bridge power divider - Google Patents

Abstract

The utility model provides a 3dB bridge power divider, comprising four ports which are respectively an input port, a 0-DEG output port, a 90-DEG output port and an isolation port, wherein between the input port and the 90-DEG output port there is provided a microstrip line as well as between the 0-DEG output port and the isolation port there is also provided a microstrip line, the 3dB bridge power divider also comprises a plurality of capacitors, and the plurality of capacitors are arranged between the input port and the 90-DEG output port as well as between the 0-DEG output port and the isolation port. The 3dB bridge power divider can play an effect of adjusting the working frequency thereof through arranging the capacitors between the input port and the 90-DEG output port as well as between the 0-DEG output port and the isolation port, and can be applied on a magnetic resonance variable-frequency multi-channel emission system.

Description

The 3dB electric bridge power splitter

Technical field

The utility model relates to a kind of power splitter, relates in particular to a kind of 3dB electric bridge power splitter.

Background technology

The 3dB electric bridge is a kind of four port devices, can be in its operating frequency divide the power of the radiofrequency signal of input equally export two equal power signal, the power that perhaps mixes the signal of two inputs uses as blender, 90 degree 3dB electric bridge power splitters are 3dB electric bridges as power divider use a kind of, and by its design, with the phase place of two signals of output 90 degree that are orthogonal.In the high power RF magnetic resonance system, need to equivalent to be carried out in the high power RF pulse of input with one 90 degree 3dB electric bridge power splitter and divide equally, phase place becomes 90 degree quadratures, thereby can hook into a uniform circular polarization magnetic field.

please refer to Fig. 1, Fig. 1 is the structural representation of 90 degree 3dB electric bridge power splitters in prior art, as shown in Figure 1, high-power 90 degree 3dB electric bridge power splitters at present of the prior art generally comprise input port 1 ', 0 degree output port 2 ', 90 degree output port 3 ' and 4 ' four ports of isolated port, between described input port 1 ' and 0 degree output port 2 ', between input port 1 ' and isolated port 4 ', between 90 degree output ports 3 ' and isolated ports 4 ' and 90 spend output ports 3 ' and 0 and spend the microstrip line 5 ' that is equipped with 0.25 λ length between output port 2 ', wherein, λ is the wavelength of this 3dB electric bridge power splitter operating frequency, its operating frequency is fixed, all of the port and microstrip line 5 ' in this 90 degree 3dB electric bridge power splitter all are positioned at same plane, when mounted, the use components and parts are built, perhaps directly carry out fabric swatch on printed circuit board (PCB) (PCB), high power RF magnetic resonance system most of 3dB electric bridge power splitters used are integrated on PCB with other components and parts combinations, compare and use the components and parts construction cost low, but the frequency requirement due to NMR system, can make microstrip line 5 ' very long with this 90 traditional degree 3dB electric bridges, thereby take very large PCB space, utilance and the vivid outward appearance in its space have been reduced, also increased the cost of manufacture of PCB, and the input signal of this 90 degree 3dB electric bridge power splitters may have error on frequency, the corresponding frequencies but it can't self be made adjustment, to reach peak efficiency.

The utility model content

The purpose of this utility model is to provide a kind of 3dB electric bridge power splitter, to overcome the above-mentioned defective that can't regulate its operating frequency for the 3dB electric bridge power splitter of high power RF magnetic resonance system.

For solving the problems of the technologies described above, the utility model provides a kind of 3dB electric bridge power splitter, comprise four ports, be respectively input port, 0 degree output port, 90 degree output port and isolated ports, be provided with microstrip line between described input port and 0 degree output port and between described 90 degree output ports and isolated port, be equipped with at least one electric capacity between described input port and isolated port and between described 0 degree output port and 90 degree output ports.

Further, be equipped with at least one electric capacity between described input port and 90 degree output ports and between described 0 degree output port and isolated port.

Further, described a plurality of electric capacity also is arranged between described 0 degree output port and ground and between described 90 degree output ports and ground.

Further, described input port, 0 degree output port and be arranged at described input port and be positioned at the first plane with 0 microstrip line of spending between output port, described 90 degree output port, isolated ports and the microstrip line that is arranged between described 90 degree output ports and isolated port are positioned at the second plane, and described the first plane and the second plane are not coplanar.

Further, the S parameter of described 3dB electric bridge is

$S=\frac{-1}{\sqrt{2}}\left(\begin{array}{cccc}0& j& 1& 0\\ j& 0& 0& 1\\ 1& 0& 0& j\\ 0& 1& j& 0\end{array}\right).$

Further, described a plurality of electric capacity is tunable capacitor.

Compared with prior art, the utlity model has following beneficial effect:

The 3dB electric bridge power splitter that the utility model provides can be by arranging electric capacity between input port and isolated port and between 0 degree output port and 90 degree output ports, to play the effect of regulating whole 3dB electric bridge power splitter operating frequency, can apply in the system of magnetic resonance different frequency multichannel emission.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of 90 degree 3dB electric bridge power splitters in prior art;

The structural representation of the 3dB electric bridge power splitter that Fig. 2 provides for the utility model embodiment;

The equivalent circuit diagram of the 3dB electric bridge power splitter that Fig. 3 provides for the utility model embodiment.

In Fig. 1 to Fig. 3,

1: input port; 2:0 degree output port; 3:90 degree output port; 4: isolated port; 5: microstrip line; 1 ': input port; 2 ': 0 degree output port; 3 ': 90 degree output ports; 4 ': isolated port; 5 ': microstrip line; C1, C2, C3, C4, C5, C6: electric capacity.

Embodiment

Below in conjunction with the drawings and specific embodiments, the 3dB electric bridge power splitter that the utility model proposes is described in further detail.According to the following describes and claims, advantage of the present utility model and feature will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the purpose of aid illustration the utility model embodiment lucidly.

core concept of the present utility model is, a kind of 3dB electric bridge power splitter is provided, comprise four ports, be respectively input port, 0 degree output port, 90 degree output port and isolated ports, be provided with microstrip line between described input port and 0 degree output port and between described 90 degree output ports and isolated port, described 3dB electric bridge power splitter also comprises a plurality of electric capacity, described a plurality of electric capacity is arranged between described input port and 90 degree output ports and between described 0 degree output port and isolated port, the 3dB electric bridge power splitter that the utility model provides can be by arranging electric capacity between input port and isolated port and between 0 degree output port and 90 degree output ports, to play the effect of regulating whole 3dB electric bridge power splitter operating frequency, can apply in the system of magnetic resonance different frequency multichannel emission.

Please refer to Fig. 2 and Fig. 3, the structural representation of the 3dB electric bridge power splitter that Fig. 2 provides for the utility model embodiment; The equivalent circuit diagram of the 3dB electric bridge power splitter that Fig. 3 provides for the utility model embodiment.

please emphasis referring to figs. 2 and 3, as shown in Figures 2 and 3, the utility model embodiment provides a kind of 3dB electric bridge power splitter, comprise four ports, be respectively input port 1, 0 degree output port 2, 90 degree output port 3 and isolated ports 4, be provided with microstrip line 5 between described input port 1 and 0 degree output port 2 and between described 90 degree output ports 3 and isolated port 4, above-mentioned 3dB electric bridge power splitter also comprises a plurality of electric capacity, two capacitor C 1 in described a plurality of electric capacity, C2 is arranged at respectively between described input port 1 and isolated port 4 and described 0 degree output port 2 and 90 is spent between output ports 3.

The 3dB electric bridge power splitter that the utility model provides can arrange respectively capacitor C 1, C2 by spending between output ports 3 and between 0 degree output port 2 and isolated port 4 at input port 1 and 90, change the capacitance of capacitor C 1, C2 to play the effect of regulating whole 3dB electric bridge power splitter operating frequency, can apply in the system of magnetic resonance different frequency multichannel emission.

further, two capacitor C 5 in described a plurality of electric capacity, C6 is arranged at respectively between described input port 1 and 90 degree output ports 3 and between described 0 degree output port 2 and isolated port 4, capacitor C 3, C4 is arranged at respectively between described 0 degree output port 2 and ground and between described 90 degree output ports 3 and ground, capacitor C 3, C4, C5, C6 all is arranged between the two-layer microstrip line 5 in up and down, and can regulate himself capacitance, make the impedance matching of itself and whole circuit, can also regulate the operating frequency of this 3dB electric bridge power splitter, the required electric capacity that provides of microstrip line 5 has been provided effectively, therefore the required length of microstrip line 5 also can reduce greatly, increased the space availability ratio of this 3dB electric bridge power splitter.

Further, described input port 1,0 degree output port 3 and be arranged at described input port 1 and all be positioned at the first plane with 0 microstrip line 5 of spending between output port 2, described 90 degree output port 3, isolated ports 4 and the microstrip line 5 that is arranged between described 90 degree output ports 2 and isolated port 4 all are positioned at the second plane, described the first plane and the second plane are not coplanar, this 3dB electric bridge power splitter adopts bilevel design, reduce its shared horizontal area, effectively increased the space availability ratio of this 3dB electric bridge power splitter.

Further, the S parameter of described 3dB electric bridge is

$S=\frac{-1}{\sqrt{2}}\left(\begin{array}{cccc}0& j& 1& 0\\ j& 0& 0& 1\\ 1& 0& 0& j\\ 0& 1& j& 0\end{array}\right),$

The S parameter is the important performance indexes of microwave circuit, and this S parameter meets the requirement of 3dB electric bridge.

Further, described above-mentioned electric capacity is tunable capacitor.

Obviously, those skilled in the art can carry out various changes and distortion and not break away from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.

Claims (5)

1. 3dB electric bridge power splitter, comprise four ports, be respectively input port, 0 degree output port, 90 degree output port and isolated ports, be respectively equipped with microstrip line between described input port and 0 degree output port and between described 90 degree output ports and isolated port, it is characterized in that, be equipped with at least one electric capacity between described input port and isolated port and between described 0 degree output port and 90 degree output ports.

2. 3dB electric bridge power splitter according to claim 1, is characterized in that, is equipped with at least one electric capacity between described input port and 90 degree output ports and between described 0 degree output port and isolated port.

3. 3dB electric bridge power splitter according to claim 2, is characterized in that, is equipped with at least one electric capacity between described 0 degree output port and ground and between described 90 degree output ports and ground.

4. 3dB electric bridge power splitter according to claim 1, it is characterized in that, described input port, 0 degree output port and be arranged at described input port and be positioned at the first plane with 0 microstrip line of spending between output port, described 90 degree output port, isolated ports and the microstrip line that is arranged between described 90 degree output ports and isolated port are positioned at the second plane, and described the first plane and the second plane are not coplanar.

5. the described 3dB electric bridge power splitter of according to claim 1 to 4 any one, is characterized in that, described a plurality of electric capacity are tunable capacitor.

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