CN213043030U - Balun based on slot line and balun filter - Google Patents
Balun based on slot line and balun filter Download PDFInfo
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- CN213043030U CN213043030U CN202021029129.2U CN202021029129U CN213043030U CN 213043030 U CN213043030 U CN 213043030U CN 202021029129 U CN202021029129 U CN 202021029129U CN 213043030 U CN213043030 U CN 213043030U
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Abstract
The utility model discloses a balun based on slotline, include: a dielectric substrate; the upper surface of the dielectric substrate is provided with an input microstrip line, a first output microstrip line, a second output microstrip line, an isolation resistor, a third microstrip line and a fourth microstrip line, and the lower surface of the dielectric substrate is provided with a slot line; the input microstrip line is arranged on one side of the dielectric substrate, and the tail end of the input microstrip line is grounded; the isolation resistor is positioned on the extension line of the input microstrip line and is vertical to the input microstrip line, and the isolation resistor is connected between the third microstrip line and the fourth microstrip line; the input microstrip line is coupled with the third slot line; the first output microstrip line and the second output microstrip line are respectively coupled with the first slot line and the fifth slot line; the third microstrip line is coupled with the second slot line, and the fourth microstrip line is coupled with the fourth slot line. The embodiment of the utility model provides a balun filter is still provided, the relatively poor problem of isolation of the output port difference signal of output microstrip can be effectively solved.
Description
Technical Field
The utility model relates to a microwave passive ware especially relates to a balun and balun wave filter based on slot line.
Background
A balun is a three-port device that includes an unbalanced single-ended input port and two balanced differential output ports. The output signal of the balun has equal amplitude and reverse phase characteristics, and impedance matching can be realized. In communication systems, the need for broadband differential signals is increasing. The wideband balun can efficiently convert a conventional single-ended signal into a desired wideband differential signal.
However, the conventional broadband balun based on the slot line realizes the broadband transmission characteristic by the opposite potential of the two sides of the slot line. However, the isolation of the differential signal of the output port of the output microstrip is poor.
Disclosure of Invention
The embodiment of the utility model provides a purpose provides a balun and balun wave filter based on slot line can effectively solve the relatively poor problem of the output port difference signal's of output microstrip isolation.
In order to achieve the above object, an embodiment of the present invention provides a balun based on a slot line, including: a dielectric substrate;
an input microstrip line, a first output microstrip line, a second output microstrip line, an isolation resistor, a third microstrip line for loading the isolation resistor and a fourth microstrip line for loading the isolation resistor are arranged on the upper surface of the dielectric substrate, and a slot line is arranged on the lower surface of the dielectric substrate; wherein, the slot line is the font of several, the slot line includes: the first slot line, the second slot line, the third slot line, the fourth slot line and the fifth slot line;
the input microstrip line is arranged on one side of the dielectric substrate, and the tail end of the input microstrip line is grounded;
the isolation resistor is positioned on the extension line of the input microstrip line and is vertical to the input microstrip line, the isolation resistor is connected between the second end of the third microstrip line and the first end of the fourth microstrip line, and the first end of the third microstrip line and the second end of the fourth microstrip line are both grounded;
the input microstrip line is coupled with the third slot line; the first output microstrip line and the second output microstrip line are coupled with the first slot line and the fifth slot line respectively; the third microstrip line is coupled with the second slot line, and the fourth microstrip line is coupled with the fourth slot line.
Compared with the prior art, the utility model discloses a balun based on slot line, through input microstrip line transmission input signal, because input microstrip line end ground for the input signal of all frequency channels is on microstrip line effective coupling to slot line, again on the slot line output again the back again respectively with first output microstrip line and second output microstrip line coupling, thereby realize the opposite phase balun characteristic of same width. And because the third microstrip line, the fourth microstrip line and the isolation resistor are arranged on the slot line, the tail ends of the third microstrip line and the fourth microstrip line are grounded, and signals reflected by the output port of the output microstrip are coupled in the same phase mode through the third microstrip line and the fourth microstrip line, so that the signals are effectively absorbed, the conversion of input signals is not influenced, the balun obtains larger bandwidth, the interference between the output signals of the two output microstrip lines is reduced, and the isolation characteristic of the output port of the output microstrip is enhanced.
As an improvement of the scheme, the two ends of the slot line are loaded by the disc slot line.
As an improvement of the above scheme, the tail end of the first output microstrip line and the tail end of the second output microstrip line are loaded by disc microstrip lines.
As an improvement of the above scheme, the input microstrip line is disposed at a midpoint of one side of the dielectric substrate.
As an improvement of the above scheme, a first through hole is formed at the tail end of the input microstrip line, and the input microstrip line is grounded through the first through hole.
As an improvement of the above scheme, a first end of the third microstrip line is provided with a second through hole, and the third microstrip line is grounded through the second through hole;
and a second end of the fourth microstrip line is provided with a third through hole, and the fourth microstrip line is grounded through the third through hole.
As a modification of the above, the isolation resistance is 100 ohms.
As an improvement of the scheme, the lower surface of the dielectric substrate is a copper plate.
As a modification of the above scheme, the dielectric constant of the dielectric substrate is 3.66.
The embodiment of the utility model provides a still provide a filter, include: the utility model discloses balun based on slotline.
Compared with the prior art, the utility model discloses a balun filter owing to adopted the embodiment the utility model provides a balun based on slot line makes balun filter has higher isolation.
Drawings
Fig. 1 is a schematic structural diagram of a balun based on a slot line in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an upper surface of a dielectric substrate of a balun based on a slot line in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a lower surface of a dielectric substrate of a balun based on a slot line in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an equivalent circuit of a balun based on a slot line in an embodiment of the present invention;
fig. 5 is a schematic diagram of a simulation result of the S parameter of the balun based on the slotline in the embodiment of the present invention;
fig. 6 is a schematic diagram of an output port phase difference simulation result of a balun based on a slot line according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an output port amplitude difference simulation result of a balun based on a slot line in an embodiment of the present invention.
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 belong to the protection scope of the present invention.
Referring to fig. 1-3, the structural schematic diagrams of a balun based on a slot line provided in embodiment 1 of the present invention are shown.
The embodiment of the utility model provides a balun based on slotline, include: a dielectric substrate; the dielectric substrate includes: the top layer is the upper surface of the dielectric substrate, and the bottom layer is the lower surface of the dielectric substrate. In this embodiment, the dielectric substrate is rectangular, and the lower surface (i.e., the bottom layer) of the dielectric substrate is a copper plate, so that the signal transmission effect is better. The dielectric substrate was Rogers 4350B, and had a dielectric constant of 3.66, a plate thickness of 0.762mm and a copper thickness of 0.035 mm.
An input microstrip line 1, a first output microstrip line 2, a second output microstrip line 4, an isolation resistor 5, a third microstrip line 9 for loading the isolation resistor 5 and a fourth microstrip line 10 for loading the isolation resistor 5 are arranged on the upper surface of the dielectric substrate, and a slot line 6 is arranged on the lower surface of the dielectric substrate; wherein, the slot line 6 is the zigzag, the slot line includes: a first slot line 61, a second slot line 62, a third slot line 63, a fourth slot line 64, and a fifth slot line 65; in the present embodiment, all the slot lines 6 are etched slot lines. The first output microstrip line 2 and the second output microstrip line 4 have the same shape and are centrosymmetric.
The input microstrip line 1 is arranged on one side of the dielectric substrate, and the tail end of the input microstrip line 1 is grounded through a first through hole 3.
The isolation resistor 5 is located on an extension line of the input microstrip line 1 and perpendicular to the input microstrip line 1, the isolation resistor 5 is connected between a second end of the third microstrip line 9 and a first end of the fourth microstrip line 10, a second through hole 12 is formed at the first end of the third microstrip line 9, and the third microstrip line 9 is grounded through the second through hole 12; a third through hole 11 is formed at a second end of the fourth microstrip line 10, and the fourth microstrip line 10 is grounded through the third through hole 11. Thereby achieving efficient coupling of the signals.
The input microstrip line 1 is coupled with the third slot line 63; the first output microstrip 2 and the second output microstrip 4 are coupled to the first slot line 61 and the fifth slot line 65, respectively; the third microstrip line 9 is coupled to the second slot line 62, and the fourth microstrip line 10 is coupled to the fourth slot line 64.
In this embodiment, the widths of the second slot line 62, the third slot line 63, and the fourth slot line 64 are all 0.3mm, and the widths of the first slot line 61 and the fifth slot line 65 are all 0.2 mm; the third microstrip line and the fourth microstrip line are both 70ohm, so that a larger bandwidth is obtained.
Compared with the prior art, the utility model discloses a balun based on slot line, through input microstrip line 1 transmission input signal, because input microstrip line 1 end ground for the input signal of all frequency channels is on microstrip line effective coupling to slot line, again on the slot line output after again respectively with first output microstrip line 2 and the coupling of second output microstrip line 4, because slot line both sides electric field inverting distribution characteristic, realize output signal's inherent broadband inverting output, thereby realize the inverting balun characteristic of same amplitude. And because the third microstrip line 9, the fourth microstrip line 10 and the isolation resistor 5 are arranged on the slot line, the tail ends of the third microstrip line 9 and the fourth microstrip line 10 are grounded, and the signals reflected by the output port of the output microstrip are coupled in the same phase mode through the third microstrip line 9 and the fourth microstrip line 10, so that the signals are effectively absorbed, the conversion of input signals is not influenced, the balun obtains larger bandwidth, the interference between the output signals of the two output microstrip lines is reduced, and the isolation characteristic of the output port of the output microstrip is enhanced.
As a modification of the above, disc slot line loads 8 are used at both ends of the slot line.
Specifically, the slot line adopts a symmetrical inverted-V shape, and the tail end adopts a disc slot line load 8, so that the disc slot line load 8 is equivalent to an inductance type compensation element, an open circuit effect is achieved, and the coupling conversion of slot line signals and micro-strip signals is enhanced.
As a modification of the above scheme, the end of the first output microstrip line 2 and the end of the second output microstrip line 4 both use a disc microstrip line load 7.
Specifically, the disc microstrip line load 7 is equivalent to a capacitive element, so that a short circuit effect is achieved, and coupling conversion of a slot line signal and a microstrip signal is enhanced.
As a modification of the above scheme, the input microstrip line 1 is disposed at a midpoint of one side of the dielectric substrate.
Specifically, the input microstrip line 1 is arranged at the midpoint of one side of the dielectric substrate, so that the slot lines on the two sides can better realize the same-amplitude inverse balun characteristic.
As a modification of the above, the isolation resistor 5 is 100 ohms.
Specifically, referring to fig. 4, the wilkinson power divider equivalent to a slot line. Wherein, Z0, Z1, Zs1 and Zs2 respectively represent characteristic impedance of the input microstrip line 1, characteristic impedance of the output microstrip line, characteristic impedance of the third microstrip line 9, characteristic impedance of the fourth microstrip line 10, characteristic impedance of the input coupling slot line and characteristic impedance of the output coupling slot line. θ 1, θ s1, and θ s2 represent the microstrip line electrical length (i.e., the length of the third microstrip line and the fourth microstrip line), the input coupling slot line electrical length, and the output coupling slot line electrical length of the loading resistor, respectively. Microstrip to slot line transitions can be characterized by transformers, and T1, T2 represent the transformation ratios of their transitions. And R is a resistor loaded on the microstrip line, and the resistance value is 100 ohms. Illustratively, referring to fig. 5-7, the simulation results of the equivalent circuit show that the circuit can realize transmission bandwidths of S11< -10dB and S23>10 dB: 1.15 GHz-8.35 GHz (relative bandwidth 152%), and minimum insertion loss of 0.5 dB. The phase imbalance of the output port is ± 1 °, and the amplitude imbalance of the output port is 0.17 dB. The circuit has the characteristics of excellent broadband, high isolation and high balance.
It can be seen that the microstrip and isolation resistor 5 (100 ohm resistor is loaded in the symmetrical microstrip with the grounded end) is loaded on the slot line, and the signal reflected by the output port is effectively absorbed in the form of in-phase through microstrip coupling. The crosstalk of signals of two output ports is reduced while the conversion of input transmission signals to output transmission signals is not influenced, so that the isolation characteristic of the output ports is enhanced.
In another embodiment of the present invention, an improvement is made on the above-mentioned slot-line-based bar wheel, and the output microstrip line is symmetrical with respect to the horizontal line, so that the in-phase coupling of the output microstrip line and the slot line is realized, which is equivalent to an in-phase power divider.
The embodiment of the utility model provides a still provide a filter, include: the utility model discloses balun based on slotline.
Compared with the prior art, the utility model discloses a balun filter owing to adopted the embodiment the utility model provides a balun based on slot line makes balun filter has higher isolation.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. A slotline-based balun, comprising: a dielectric substrate;
an input microstrip line, a first output microstrip line, a second output microstrip line, an isolation resistor, a third microstrip line for loading the isolation resistor and a fourth microstrip line for loading the isolation resistor are arranged on the upper surface of the dielectric substrate, and a slot line is arranged on the lower surface of the dielectric substrate; wherein, the slot line is the font of several, the slot line includes: the first slot line, the second slot line, the third slot line, the fourth slot line and the fifth slot line;
the input microstrip line is arranged on one side of the dielectric substrate, and the tail end of the input microstrip line is grounded;
the isolation resistor is positioned on the extension line of the input microstrip line and is vertical to the input microstrip line, the isolation resistor is connected between the second end of the third microstrip line and the first end of the fourth microstrip line, and the first end of the third microstrip line and the second end of the fourth microstrip line are both grounded;
the input microstrip line is coupled with the third slot line; the first output microstrip line and the second output microstrip line are coupled with the first slot line and the fifth slot line respectively; the third microstrip line is coupled with the second slot line, and the fourth microstrip line is coupled with the fourth slot line.
2. A slot line based balun according to claim 1 in which the slot line is loaded at both ends with a disk slot line.
3. The slot-line based balun of claim 1, wherein the end of the first output microstrip line and the end of the second output microstrip line are each loaded with a disk microstrip line.
4. A slot-line based balun according to claim 1 in which the input microstrip line arrangement is located at the mid-point of one side of the dielectric substrate.
5. The slot-line based balun of claim 1, wherein a first via is opened at an end of the input microstrip line, and the input microstrip line is grounded through the first via.
6. The slot-line based balun of claim 1, wherein a first end of the third microstrip line is opened with a second via, and the third microstrip line is grounded through the second via;
and a second end of the fourth microstrip line is provided with a third through hole, and the fourth microstrip line is grounded through the third through hole.
7. The slotline-based balun of claim 1, wherein the isolation resistance is 100 ohms.
8. The slot line based balun of claim 1 in which the lower surface of the dielectric substrate is a copper plate.
9. The slot line based balun of claim 1, wherein the dielectric substrate has a dielectric constant of 3.66.
10. A balun filter, comprising: the slotline-based balun of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021029129.2U CN213043030U (en) | 2020-06-05 | 2020-06-05 | Balun based on slot line and balun filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021029129.2U CN213043030U (en) | 2020-06-05 | 2020-06-05 | Balun based on slot line and balun filter |
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| Publication Number | Publication Date |
|---|---|
| CN213043030U true CN213043030U (en) | 2021-04-23 |
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| CN202021029129.2U Active CN213043030U (en) | 2020-06-05 | 2020-06-05 | Balun based on slot line and balun filter |
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| CN (1) | CN213043030U (en) |
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