CN217607004U - Broadband balun - Google Patents
Broadband balun Download PDFInfo
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- CN217607004U CN217607004U CN202221424321.0U CN202221424321U CN217607004U CN 217607004 U CN217607004 U CN 217607004U CN 202221424321 U CN202221424321 U CN 202221424321U CN 217607004 U CN217607004 U CN 217607004U
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Abstract
The utility model discloses a broadband balun belongs to radio frequency chip technical field, including six inductance, six electric capacity, port 1, 2 and 3 and reference ground, wherein, first, second and third electric capacity are established ties in proper order between terminal 1 and 2, and first inductance is connected between terminal 1 and reference ground, and the second inductance is connected between the tie point of first and second electric capacity and reference ground, and the third inductance is connected between the tie point of second and third electric capacity and reference ground; a fourth, a fifth and a sixth inductance are connected in series between the terminals 1 and 3 in sequence, a fourth capacitance is connected between the terminal 1 and the reference ground, a fifth capacitance is connected between the connection point of the fourth and the fifth inductance and the reference ground, and a sixth capacitance is connected between the connection point of the fifth and the sixth inductance and the reference ground. The utility model provides a broadband balun, the balun case shows that its operating frequency range is 2.616-5.52GHz, and the relative bandwidth is 71.4%, has realized the miniaturized LC balun of broadband.
Description
Technical Field
The utility model relates to a radio frequency chip technical field, in particular to broadband balun.
Background
The balun has wide application in modern communication systems, for example, the balun is required to be used in design implementation of elements such as a balanced mixer, a push-pull amplifier, a differential low-noise amplifier and an antenna feed network. The development direction of modern communication system is broadband and miniaturization, so the design direction of balun in the industry is broadband and smallShaped and planar structures. The industry generally uses a first-order Lattice LC balun, which is simple but only at the center frequency f 0 The optimal balun property is achieved, and the bandwidth is very narrow.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a broadband balun to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the broadband balun comprises six inductors, six capacitors, ports 1, 2 and 3 and a reference ground G, wherein the ports 1, 2 and 3 are external connection ports and are all unbalanced ports and respectively composed of terminals 1 and 1', terminals 2 and 2' and terminals 3 and 3 '; terminals 1', 2' and 3' are all connected to a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun formed by an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 An inductor L 2 An inductor L 3 Inductor L 4 An inductor L 5 And an inductance L 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Inductor L 1 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
capacitor C 1 Is electrically connected to the terminal 1, and the other end is connected to the capacitor C 2 One terminal of the capacitor C is electrically connected 2 Another terminal of (1) and a capacitor C 3 Is electrically connected to a terminal of a capacitor C 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 2 One terminal of and a capacitor C 1 And C 2 The other end of the connecting point is electrically connected with a reference ground G;
inductor L 3 One terminal of and a capacitor C 2 And C 3 Is electrically connected to the connection point of the reference ground G, and the other end of the reference ground G is electrically connected to the groundThe other end of the capacitor C3 is electrically connected with the terminal 2;
capacitor C 4 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 Electrical connection, inductance L 5 Another end of (1) and an inductor L 6 Is electrically connected to one end of an inductor L 6 The other end of the terminal 3 is electrically connected with the terminal;
capacitor C 5 One end of (1) and an inductor L 4 And L 5 The other end of the connecting point is electrically connected with a reference ground G;
capacitor C 6 One end of (1) and an inductor L 5 And L 6 The other end of the connection point is electrically connected with a reference ground G;
when the balun works, the external load impedance Z of the utility model comprises the balanced load impedance R of the balanced port B And load impedance R of unbalanced port UN Wherein R is B And R UN Resistance value R of B And R UN Are all real numbers.
Balanced load impedance R of balanced port B Electrical connections to terminals 2 and 3;
unbalanced port load impedance RUN is electrically connected to terminals 1 and 1'.
Further, the utility model discloses central frequency f 0 Then ω is 0 ＝2×π×f 0 . The utility model provides an inductance value and capacitance value must satisfy following relation:
compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a broadband balun has only used lumped parameter inductance L and electric capacity C to do not need extra mutual inductance components and parts, simplified the complexity of design, realized the wide bandization and the miniaturization of component. The utility model discloses have broadband working property, the relative frequency bandwidth of the balun that realizes in the implementation case reaches 71.4%. Additionally, the utility model discloses when realizing the balun function, still realized load impedance matching function, consequently, used the utility model discloses a wireless communication system need not extra impedance matching components and parts, and this system size can further reduce.
Drawings
FIG. 1 is a schematic diagram of the balun of the present invention, wherein the unbalanced system with unbalanced ports connected to the outside presents a load impedance R at the unbalanced ports UN In a balanced system with balanced ports connected to the outside, the balanced load impedance (differential impedance) of the balanced ports is R B ；
Fig. 2 is a simulation result of dBS11 of the unbalanced port in the operating frequency band according to the first embodiment of the present invention;
fig. 3 is a simulation result of the output port balance signal amplitude imbalance in the working frequency band range according to the first embodiment of the present invention;
fig. 4 is a simulation result of the phase difference of the balanced signal at the output port of the first embodiment of the present invention within the operating frequency band.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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 efforts all belong to the protection scope of the present invention.
Referring to fig. 1, the wideband balun includes six inductors, six capacitors, ports 1, 2, and 3, and a reference ground G, where the ports 1, 2, and 3 are external connection ports and are all unbalanced ports, and are respectively formed by terminals 1 and 1', terminals 2 and 2', and terminals 3 and 3 '; terminals 1', 2' and 3' are all connected to a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun formed by an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 Inductor L 2 Inductor L 3 Inductor L 4 An inductor L 5 And an inductance L 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Inductor L 1 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
capacitor C 1 Is electrically connected to the terminal 1, and the other end is connected to the capacitor C 2 Is electrically connected to a terminal of a capacitor C 2 Another terminal of (1) and a capacitor C 3 Is electrically connected to a terminal of a capacitor C 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 2 One terminal of and a capacitor C 1 And C 2 The other end of the connecting point is electrically connected with a reference ground G;
inductor L 3 One terminal of (A) and a capacitor C 2 And C 3 The other end of the capacitor C3 is electrically connected with the terminal 2;
capacitor C 4 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 Electrical connection, inductance L 5 Another end of (2) and an inductor L 6 Is electrically connected to one end of an inductor L 6 The other end of the terminal 3 is electrically connected with the terminal;
capacitor C 5 One end of (A) and an inductor L 4 And L 5 The other end of the connecting point is electrically connected with a reference ground G;
capacitor C 6 One end of (1) and an inductor L 5 And L 6 The other end of the connecting point is electrically connected with a reference ground G;
when the balun works, the external load impedance Z of the utility model comprises the balanced load impedance R of the balanced port B And load impedance R of unbalanced port UN Wherein R is B And R UN Resistance value R of B And R UN Are all real numbers.
Balanced load impedance R of balanced port B Electrical connections to terminals 2 and 3;
unbalanced port load impedance R UN Electrically connected to terminals 1 and 1'.
The utility model discloses center frequency of operation f 0 Then ω is 0 ＝2×π×f 0 . The utility model provides an inductance value and capacitance value must satisfy following relation:
the first embodiment is as follows: broadband balun with central working frequency of 3.8GHz and balanced and unbalanced load impedance of 100 omega and 50 omega
The following parameters are calculated according to the design method
L 1 ＝L 2 ＝7.1499nH，L 3 ＝4.1883nH，L 4 ＝2.0941nH，L 5 ＝L 6 ＝1.2267nH，C 1 ＝0.8377pF，C 2 ＝C 3 ＝1.4300pF，C 4 ＝C 5 ＝0.2453pF，C 6 ＝0.4188pF。
From the above parameters, according to the design method, as can be seen from FIG. 2, dBS (1, 1) < -10dB, frequency range is 1.557-9.277GHz according to the design method.
As can be seen from fig. 3, | dBS (2, 1) -dBS (3, 1) | <1.5dB, frequency range is 2.199-6.565GHz, according to the design method.
As can be seen from fig. 4, | phase (S (2, 1)) -phase (S (3, 1)) | -180 ° | <20 ° in the frequency range of 2.616-5.52GHz according to the design method.
Therefore, aiming at the design target, the balun designed by applying the design method of the utility model has the working frequency range of 2.616-5.52GHz and the relative bandwidth of 71.4 percent, and achieves the broadband working performance.
In conclusion: the utility model discloses a broadband balun that miniaturized, plane, the LC that uses lumped parameter constitutes uses the utility model provides a balun of design method design, its relative bandwidth reaches 71.4%, has reached the design purpose of broadband work bandwidth.
The above description is only the specific implementation manner of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the design of the present invention within the technical scope of the present invention.
Claims (2)
1. The broadband balun is characterized by comprising six inductors, six capacitors, ports 1, 2 and 3 and a reference ground G, wherein the ports 1, 2 and 3 are external connection ports and are all unbalanced ports and respectively composed of terminals 1 and 1', terminals 2 and 2' and terminals 3 and 3 '; the terminals 1', 2' and 3' are all connected with a reference ground G; meanwhile, the terminals 2 and 3 form a balance port;
the port 1, the port 2 and the port 3 are connected with a balun formed by an inductor L, a capacitor C and a reference ground G;
the inductor L in the balun comprises an inductor L 1 Inductor L 2 Inductor L 3 Inductor L 4 An inductor L 5 And an inductorL 6 ；
The capacitor C in the balun comprises a capacitor C 1 Capacitor C 2 Capacitor C 3 Capacitor C 4 Capacitor C 5 And a capacitor C 6 ；
Inductor L 1 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
capacitor C 1 Is electrically connected to the terminal 1, and the other end is connected to the capacitor C 2 Is electrically connected to a terminal of a capacitor C 2 Another terminal of (1) and a capacitor C 3 One terminal of the capacitor C is electrically connected 3 The other end of the terminal is electrically connected with the terminal 2;
inductor L 2 One terminal of and a capacitor C 1 And C 2 The other end of the connecting point is electrically connected with a reference ground G;
inductor L 3 One terminal of (A) and a capacitor C 2 And C 3 The other end of the capacitor C3 is electrically connected with the terminal 2;
capacitor C 4 One end of which is electrically connected to the terminal 1 and the other end of which is electrically connected to a reference ground G;
inductor L 4 Is electrically connected to the terminal 1, and the other end is connected to the inductor L 5 Electrical connection, inductance L 5 Another end of (2) and an inductor L 6 Is electrically connected to one end of an inductor L 6 The other end of the terminal 3 is electrically connected with the terminal;
capacitor C 5 One end of (A) and an inductor L 4 And L 5 The other end of the connecting point is electrically connected with a reference ground G;
capacitor C 6 One end of (A) and an inductor L 5 And L 6 The other end of the connecting point is electrically connected with a reference ground G;
when the balun is in actual operation, the external load impedance Z comprises a balanced port balanced load impedance R B And unbalanced port load impedance R UN Wherein R is B And R UN Resistance value R of B And R UN Are all real。
Balanced load impedance R of balanced port B Electrically connected to terminals 2 and 3;
unbalanced port load impedance R UN Electrical connections are made to terminals 1 and 1'.
2. The wideband balun of claim 1, wherein the wideband balun has a center operating frequency f 0 Then ω is 0 ＝2×π×f 0 The inductance and capacitance values must satisfy the following relationship:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221424321.0U CN217607004U (en) | 2022-06-08 | 2022-06-08 | Broadband balun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221424321.0U CN217607004U (en) | 2022-06-08 | 2022-06-08 | Broadband balun |
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| Publication Number | Publication Date |
|---|---|
| CN217607004U true CN217607004U (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221424321.0U Active CN217607004U (en) | 2022-06-08 | 2022-06-08 | Broadband balun |
Country Status (1)
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|---|---|
| CN (1) | CN217607004U (en) |
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2022
- 2022-06-08 CN CN202221424321.0U patent/CN217607004U/en active Active
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