CN2922151Y - Secondary harmonic suppressed device - Google Patents
Secondary harmonic suppressed device Download PDFInfo
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- CN2922151Y CN2922151Y CN 200620008050 CN200620008050U CN2922151Y CN 2922151 Y CN2922151 Y CN 2922151Y CN 200620008050 CN200620008050 CN 200620008050 CN 200620008050 U CN200620008050 U CN 200620008050U CN 2922151 Y CN2922151 Y CN 2922151Y
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Abstract
The utility model provides a secondary harmonic suppressed device. The secondary harmonic suppressed device is realized by a transmit circuit of a printed plate circuit, and is formed by connecting a RF branch line circuit having a short out terminal, with a transmission line in parallel. The electrical length L of the branch line circuit as follow: L=n* lambada/2+lambada/4, wherein lambada is carrier wave length, and n is zero or positive integer. The secondary harmonic suppressed device of the utility model is realized by PCB circuit. Therefore, the utility mode has no extra cost, and saves material cost and is of high reliability.
Description
Technical field
The utility model relates to a kind of second harmonic restraining device, especially a kind of second harmonic restraining device that is used to realize the TD-SCDMA user terminal.
Background technology
Regulation in 3GPP TS 34.122 6.8.2.2 joint, the stray radiation of TD-SCDMA user terminal are less than-47dBm under 1MHz measurement bandwidth in the 2.170-12.75GHz scope.Because power amplifier and other device is non-linear, when full power was launched, the big spurious signal of the harmonic wave constituent ratio that transmits was wherein especially with second harmonic (frequency range 4020-4050MHz) maximum, probably exceed standard, so be necessary second harmonic is suppressed.The most frequently used method is the low pass filter that level adds a Surface Mount behind power amplifier at present, filters second harmonic.
Monolithic low pass filter LFL152G01 with Japanese Murata Manufacturing Co. Ltd. is an example, and it aims at the TD-SCDMA user terminal design, and size 1.0mm*0.5mm can realize the second harmonic and the high order harmonic component of TD-SCDMA signal are suppressed preferably.But, adopt the component number of this patch filter in need the increase scheme, can increase cost undoubtedly.
In addition, the nearly 0.5dB of band internal loss of general Surface Mount low pass filter, this can reduce power output undoubtedly, increases the power consumption of terminal.
The utility model content
The technical problems to be solved in the utility model provides a kind of second harmonic restraining device, can realize effective inhibition of second harmonic under the situation that does not increase the circuit elements device.
For solving the problems of the technologies described above, the utility model provides a kind of second harmonic restraining device, the restraining device of this second harmonic adopts the transmission circuit on the printed circuit board to realize, it is the radio-frequency branch line circuit of a section termination short circuit in parallel on transmission line, the electrical length L of branch line circuit satisfies L=n * λ/2+ λ 4, wherein λ is a carrier wavelength, and n is zero or positive integer.
Further, branch line is connected in parallel on the transmission line that connects isolator and radio-frequency (RF) switch.
Further, branch line is connected in parallel on the transmission line that connects radio-frequency (RF) switch and radio frequency testing seat.
Further, this restraining device adopts multilayer circuit board to realize.
Further, the branch line of this restraining device adopts strip line to realize.
Further, transmission line is that microstrip line is walked ground floor, and branch line is that strip line is walked the second layer, the 3rd layer of floor file, and the transmission line of ground floor is connected by the laser blind hole of ground floor to the second layer with the branch line of the second layer.
Further, corresponding ground floor floor file place of branch's stripline end has the laser blind hole of a ground floor to the second layer, to guarantee reliable ground.
Further, the branch line of this restraining device adopts microstrip line to realize.
Further, transmission line and branch line all are the microstrip lines of walking ground floor, and the second layer hollows out below transmission line, floor file below the branch line.
Further, branch's microstrip line end has the laser blind hole of a ground floor to the second layer, to guarantee reliable ground.
The utility model is compared with the restraining device that adopts patch filter realization second harmonic, all utilizes the PCB circuit to realize, does not have extra cost, thereby saved a Surface Mount low pass filter in scheme, can save Material Cost; The process reliability of PCB circuit will be higher than the reliability of surface mounting component far away simultaneously, and this device has reduced component number, improves the reliability of entire circuit.Used transmission line in this device can select for use strip line or microstrip line to realize according to the layout of side circuit plate flexibly.
Description of drawings
Fig. 1 is the microwave circuit schematic diagram of the utility model embodiment second harmonic restraining device.
Fig. 2 is the exemplary circuit figure that the branch line in Fig. 1 device adopts strip line to realize.
Fig. 3 is the exemplary circuit figure that the branch line in Fig. 1 device adopts microstrip line to realize.
Fig. 4 is that the utility model second harmonic restraining device is applied in the circuit theory diagrams in the TD-SCDMA terminal.
Embodiment
Below in conjunction with accompanying drawing the utility model is done detailed explanation:
Fig. 1 is the circuit diagram of the utility model embodiment second harmonic restraining device.This restraining device is radio-frequency branch line 3 realizations that T shape is tied the section termination short circuit in parallel of 2 places on transmission line 1.
The electrical length L of branch line 3 need satisfy following formula:
L＝n×λ/2+λ/4
Wherein λ is a carrier wavelength, and n is zero or positive integer.
According to above formula, the electrical length of branch line 3 can be 1/2nd wavelength of carrier signal, or four/three-wavelength etc.So, own characteristic according to carrier wave, it is short circuit that branch line 3 is tied 2 places equivalent for the second harmonic of carrier wave T shape, signal all is reflected back, and for carrier signal, be open circuit in the equivalence of the T of branch line shape knot place, do not influence the signal transmission, thereby realized inhibition second harmonic signal.
Below be that the quarter-wave of transmission line 1 carrier signal is that example describes with the electrical length of branch line 3, second harmonic for carrier wave, the electrical length of this section branch line 3 is 1/2nd wavelength, the carrier signal of 3 pairs of transmission lines 1 of this section branch line is an equivalent electric circuit like this, is equivalent short circuit to the second harmonic of carrier wave.
During present embodiment restraining device utilization multi-layer PCB commonly used was realized, the branch line 3 in the restraining device can select for use strip line or microstrip line to realize according to the layout of side circuit plate flexibly.
Fig. 2 is the exemplary circuit figure that the branch line 3 in this restraining device adopts strip line to realize.
Be ground floor, the second layer and the 3rd layer from left to right successively among the figure.Ground floor medium RCC, relative dielectric constant E
r≈ 3.6, thickness 0.07mm, second layer medium FR4, relative dielectric constant E
r≈ 4.2, thickness 0.07mm.Transmission line 1 adopts microstrip line to walk ground floor, and branch line 3 adopts strip line to walk the second layer, the 3rd layer of floor file.The 50ohm microstrip line of ground floor and the strip line of the second layer connect by the laser blind hole Vial between the ground floor and the second layer.The strip line track lengths of the second layer is according to centre frequency 2017.5MHz, and electrical length λ/4 are provided with.This circuit is because responsive bandwidth than broad, so the variation of dielectric constant is had certain redundancy range, understands explaining in addition below at this point.Because dielectric thickness is thinner in this example, in order to guarantee machining accuracy, suitably relaxed live width, branch line 3 impedances are about 35ohm.Branch line 3 ends are in order to guarantee reliable ground, and the laser blind hole Via2 of a ground floor to the second layer beaten in floor file place of corresponding ground floor.Other ground hole does not embody in circuit, can add according to actual needs.
Fig. 3 is the exemplary circuit figure that the branch line 3 of this restraining device adopts microstrip line to realize.Be ground floor, the second layer and the 3rd layer from left to right successively among the figure.Ground floor medium RCC, E
r≈ 3.6, thickness 0.07mm, second layer medium FR4, E
r≈ 4.2, thickness 0.07mm.Transmission line 1 and branch line 3 all adopt microstrip line to walk ground floor, and the second layer hollows out below transmission line 1, floor file below the branch line 3, and microstrip branch line 3 track lengths of ground floor are according to centre frequency 2017.5MHz, and electrical length λ/4 are provided with.Because do not hollow out below the branch line 3 in this example, dielectric thickness is thinner, in order to guarantee machining accuracy, has suitably relaxed live width, branch line 3 impedances are about 45ohm.Transmission line 1 is impedance 50ohm.Branch line 3 ends are in order to guarantee reliable ground, have beaten the laser blind hole of a ground floor to the second layer.Other ground hole does not embody in circuit, can add according to actual needs.
From the result of field analysis software emulation, this restraining device for carrier wave in the 2010-2025MHz frequency range, insert the loss very little, in 0.1dB; For harmonic signal in the 4000-4100MHz scope second harmonic more than 20dB.
According to E
rThe scope that is worth relative excursion ± 5%, live width absolute error ± 0.01mm, dielectric thickness relative error ± 10% is analyzed the sensitiveness of this device, the result be the Insertion Loss of this restraining device under worst condition less than 0.3dB, harmonic wave suppresses more than the 15dB.So the redundancy of this circuit is bigger, and is insensitive to machining accuracy.
In order to eliminate the spurious signal that the harmonic wave transmit constitutes well, after present embodiment second harmonic restraining device can be applied in the power amplifier of user terminal, below be that example describes to be applied in the TD-SCDMA user terminal.
Fig. 4 is that the utility model second harmonic restraining device is applied in the circuit theory diagrams in the TD-SCDMA terminal.This restraining device is connected on after the transmitting branch isolator 4, before the radio-frequency (RF) switch 5.The transmission line 1 of this restraining device is one section microstrip transmission line that impedance is 50ohm, the T-branch line 3 of a middle section termination short circuit in parallel.The electrical length of this section branch line 3 is quarter-waves of carrier signal, like this for carrier signal, ties the equivalence of 2 places the T of branch line 3 shape and is open circuit, does not influence the signal transmission; And for the second harmonic of carrier wave, the electrical length of this section branch line 3 is 1/2nd wavelength, and T shape is tied the equivalence of 2 places and is short circuit, and signal all is reflected back, thereby has realized the inhibition to second harmonic signal.
Above-mentioned restraining device also can be added between radio-frequency (RF) switch and the radio frequency testing seat.
The utility model restraining device all utilizes the PCB circuit to realize, does not have extra cost, thereby saved a Surface Mount low pass filter in scheme, can save Material Cost; The process reliability of PCB circuit will be higher than the reliability of surface mounting component far away simultaneously, and this device has reduced component number, improves the reliability of entire circuit.
Claims (10)
1, a kind of second harmonic restraining device, it is characterized in that: the restraining device of this second harmonic adopts the transmission circuit on the printed circuit board to realize, it is the radio-frequency branch line circuit of a section termination short circuit in parallel on transmission line, the electrical length L of branch line circuit satisfies L=n * λ/2+ λ/4, wherein λ is a carrier wavelength, and n is zero or positive integer.
2, device as claimed in claim 1 is characterized in that: branch line is connected in parallel on the transmission line that connects isolator and radio-frequency (RF) switch.
3, device as claimed in claim 1 is characterized in that: branch line is connected in parallel on the transmission line that connects radio-frequency (RF) switch and radio frequency testing seat.
4, device as claimed in claim 1 is characterized in that: this restraining device adopts multilayer circuit board to realize.
5, device as claimed in claim 4 is characterized in that: the branch line of this restraining device adopts strip line to realize.
6, device as claimed in claim 5 is characterized in that: transmission line is that microstrip line is walked ground floor, and branch line is that strip line is walked the second layer, the 3rd layer of floor file, and the transmission line of ground floor is connected by the laser blind hole of ground floor to the second layer with the branch line of the second layer.
7, device as claimed in claim 6 is characterized in that: corresponding ground floor floor file place of branch's stripline end has the laser blind hole of a ground floor to the second layer.
8, device as claimed in claim 4 is characterized in that: the branch line of this restraining device adopts microstrip line to realize.
9, device as claimed in claim 8 is characterized in that: transmission line and branch line all are the microstrip lines of walking ground floor, and the second layer hollows out below transmission line, floor file below the branch line.
10, device as claimed in claim 9 is characterized in that: branch's microstrip line end has the laser blind hole of a ground floor to the second layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620008050 CN2922151Y (en) | 2006-03-14 | 2006-03-14 | Secondary harmonic suppressed device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620008050 CN2922151Y (en) | 2006-03-14 | 2006-03-14 | Secondary harmonic suppressed device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2922151Y true CN2922151Y (en) | 2007-07-11 |
Family
ID=38254623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620008050 Expired - Fee Related CN2922151Y (en) | 2006-03-14 | 2006-03-14 | Secondary harmonic suppressed device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2922151Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110720159A (en) * | 2017-06-27 | 2020-01-21 | 上海诺基亚贝尔股份有限公司 | Microwave device structure and implementation method thereof |
| CN115498388A (en) * | 2022-09-29 | 2022-12-20 | 武汉凡谷电子技术股份有限公司 | Resonance structure and filter |
| CN115513617A (en) * | 2022-09-29 | 2022-12-23 | 武汉凡谷电子技术股份有限公司 | Filter |
-
2006
- 2006-03-14 CN CN 200620008050 patent/CN2922151Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110720159A (en) * | 2017-06-27 | 2020-01-21 | 上海诺基亚贝尔股份有限公司 | Microwave device structure and implementation method thereof |
| CN115498388A (en) * | 2022-09-29 | 2022-12-20 | 武汉凡谷电子技术股份有限公司 | Resonance structure and filter |
| CN115513617A (en) * | 2022-09-29 | 2022-12-23 | 武汉凡谷电子技术股份有限公司 | Filter |
| CN115513617B (en) * | 2022-09-29 | 2024-01-02 | 武汉凡谷电子技术股份有限公司 | Filter |
| CN115498388B (en) * | 2022-09-29 | 2024-04-26 | 武汉凡谷电子技术股份有限公司 | Filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070711 Termination date: 20140314 |