CN209046602U - A kind of absorption-type low-pass filter - Google Patents
A kind of absorption-type low-pass filter Download PDFInfo
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- CN209046602U CN209046602U CN201822047693.6U CN201822047693U CN209046602U CN 209046602 U CN209046602 U CN 209046602U CN 201822047693 U CN201822047693 U CN 201822047693U CN 209046602 U CN209046602 U CN 209046602U
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Abstract
The utility model relates to a kind of absorption-type low-pass filters, belong to wave filter technology field.The utility model includes a duplexer and an absorption resistance, duplexer includes a low pass branch and a high pass branch, the output end of high pass branch is connect with absorption resistance, the other end of absorption resistance is grounded, the resonance frequency of low pass branch and high pass branch is complementary, the utility model realizes complete areflexia low-pass filter using two passbands of duplexer, the frequency signal that one tunnel needs, another access absorbs unwanted frequency signal, the signal of filter stop bend part is also completely absorbed, in the case where not needing additional assemblies, reduce and generates additional unnecessary signal, the dynamic range of improvement system, the circuit structure of the utility model is simple, the component number for including is few, bandwidth is controllable, convenient for design.
Description
Technical field
The utility model relates to a kind of absorption-type low-pass filters, belong to wave filter technology field.
Background technique
From communication to radio astronomy, filter is almost present in all electronic systems, and conventional filter can be
Signal source is returned in unwanted frequency signal reflex, achievees the purpose that filtering.But it in the application of most of circuit, is reflected back
The signal of signal source can cause very big influence to the performance of circuit.It, can be with for example, the high power tube on high-power transmitter
It reflects the energy of signal and generates harmful resonance；Filter is often used in front of and after frequency mixer, and Conventional filters
The stopband signal of reflection returns in frequency mixer, can generate some unnecessary harmonic waves；In high-gain amplifier circuit, it is reflected back
The stopband signal in source may make amplifier unstable and vibrate.Design a filter without reflecting signal, so that it may
It solves the above problems.
In order to weaken influence of the reflection signal of stopband to circuit, it is often necessary to add some additional groups in circuit
Part.Such as in mixer, it is often suitably inserting attenuator before and after frequency mixer, stopband signal is decayed, still
This method can reduce the signal-to-noise ratio and dynamic range of whole system；Gone out using differential type filter two-port into two-port, and
And increase by 90 ° of electric bridge realizations on input/output port and equilibrate to unbalanced conversion, stopband reflection signal can also be weakened
It influences, but this technology makes the bandwidth of filter be limited by the bandwidth of electric bridge, and electrical property is very poor；It is fixed using two 3dB
Stopband signal can be also absorbed to coupler and the reflecting filter of two routines, but the circuit size designed is big, element
Number is more, pass-band loss is big.So that these designs cannot all fully meet circuit requirement.
Utility model content
The purpose of the utility model is to overcome drawbacks described above existing for existing filter, propose a kind of absorption low pass
Filter, the frequency signal needed using the two paths of duplexer, a tunnel, another access absorb unwanted
Frequency signal has reached complete unreflected effect.
The utility model, which is that the following technical solution is employed, to be realized:
A kind of absorption-type low-pass filter, includes a duplexer and an absorption resistance, and the duplexer includes one
Low pass branch and a high pass branch, the output end of the high pass branch are connect with absorption resistance, the absorption resistance it is another
The resonance frequency of end ground connection, the low pass branch and high pass branch is complementary.
Further, the low pass branch routing inductance L1, inductance L2 and capacitor C1 composition, input terminal connect inductance L1, electricity
Feel L1 connection inductance L2, inductance L2 connection output end, capacitor C1 is connected between inductance L1 and inductance L2, the other end of capacitor C1
Ground connection.
Further, the high pass branch routing inductance L3, capacitor C2, capacitor C3 and resistance R composition, input terminal connect capacitor
C2, capacitor C2 connection capacitor C3, capacitor C3 connection resistance R, resistance R other end ground connection, inductance L3 are connected to capacitor C2 and capacitor
Between C3, inductance L3 other end ground connection.
Further, inductance L1, inductance L2 and inductance L3 use planar spiral inductor.
Further, capacitor C1, capacitor C2 and capacitor C3 use thin-film capacitor, and nitrogen is filled between two metal polar plates
SiClx medium,
Further, resistance R is made of chrome-nickel.
Further, inductance L1, inductance L2, inductance L3, capacitor C1, capacitor C2, capacitor C3 and resistance R are integrated in high resistant
On silicon substrate.
The beneficial effects of the utility model are:
(1) the utility model realizes complete areflexia low-pass filter using two passbands of duplexer, and one logical
Road transmission need frequency signal, another access absorb unwanted frequency signal, the signal of filter stop bend part also by
It fully absorbs, in the case where not needing additional assemblies, reduces and generate additional unnecessary signal, improve the dynamic range of system, this
The component number that the circuit structure of utility model is simple, includes is few, bandwidth is controllable, convenient for design；
(2) the utility model realizes that circuit size is small, performance is high, temperature stability is good, first by IPD high resistant silicon technology
Part value using flexible, is suitable for producing in batches.
Detailed description of the invention
Fig. 1 is the circuit topology figure of the absorption-type low-pass filter of the utility model；
Fig. 2 is the circuit layer structure schematic diagram of the absorption-type low-pass filter of the utility model；
Fig. 3 is the S parameter simulation result of the absorption-type low-pass filter of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the circuit topology figure of the utility model absorption-type low-pass filter, includes a duplexer and one
Absorption resistance, duplexer include that a low pass branch and a high pass branch, the output end of high pass branch are connect with absorption resistance,
The other end of absorption resistance is grounded, and the resonance frequency of low pass branch and high pass branch is complementary.
Low pass branch routes inductance L1, inductance L2 and capacitor C1 composition, and input terminal connects inductance L1, inductance L1 connection inductance
L2, inductance L2 connection output end, capacitor C1 are connected between inductance L1 and inductance L2, the other end ground connection of capacitor C1.
High pass branch routes inductance L3, capacitor C2, capacitor C3 and resistance R composition, input terminal and connects capacitor C2, capacitor C2 connection
Capacitor C3, capacitor C3 connection resistance R, resistance R other end ground connection, inductance L3 are connected between capacitor C2 and capacitor C3, inductance L3
Other end ground connection.
As shown in Fig. 2, being GSG input terminal on the left of the utility model, right side is GSG output end, and capacitor C1 and inductance L3 are logical
TSV through hole ground connection is crossed, inductance L1, inductance L2 and inductance L3 use planar spiral inductor, and capacitor C1, capacitor C2 and capacitor C3 are used
Thin-film capacitor, is filled with silicon nitride medium between two metal polar plates, and resistance R is made of chrome-nickel.
As shown in figure 3, the absorption-type low-pass filter cutoff frequency of the utility model is 2.5GHz, lead to in-band insertion loss
Less than 0.9dB；DC ~ 20GHz standing wave is less than 15dB；In stopband, inhibit to be greater than 25dB in 6GHz to 24GHz range.
The encapsulating structure of the utility model is (0.9mm × 0.9mm × 0.3mm), by metal ground layer, includes metal throuth hole
Silicon dielectric layer, silicon oxide layer, resistive layer and filter circuit layer are constituted.
Certainly, above content is only the preferred embodiment of the utility model, be should not be construed as limiting practical new to this
The scope of embodiments of type.The utility model is also not limited to the example above, and those skilled in the art are in this reality
With all the changes and improvements etc. made in novel essential scope, the patent covering scope of the utility model should all be belonged to
It is interior.
Claims (7)
1. a kind of absorption-type low-pass filter, it is characterised in that: include a duplexer and an absorption resistance, the duplexer
Including a low pass branch and a high pass branch, the output end of the high pass branch is connect with absorption resistance, the absorption electricity
The other end of resistance is grounded, and the resonance frequency of the low pass branch and high pass branch is complementary.
2. absorption-type low-pass filter according to claim 1, it is characterised in that: the low pass branch routes inductance L1, electricity
Feel L2 and capacitor C1 composition, input terminal connects inductance L1, inductance L1 connection inductance L2, inductance L2 connection output end, capacitor C1 company
It connects between inductance L1 and inductance L2, the other end ground connection of capacitor C1.
3. absorption-type low-pass filter according to claim 1, it is characterised in that: the high pass branch routes inductance L3, electricity
Hold C2, capacitor C3 and resistance R composition, input terminal connects capacitor C2, capacitor C2 connection capacitor C3, capacitor C3 connection resistance R, resistance
R other end ground connection, inductance L3 are connected between capacitor C2 and capacitor C3, inductance L3 other end ground connection.
4. absorption-type low-pass filter according to claim 1, it is characterised in that: inductance L1, inductance L2 and inductance L3 are adopted
Use planar spiral inductor.
5. absorption-type low-pass filter according to claim 1, it is characterised in that: capacitor C1, capacitor C2 and capacitor C3 are adopted
With thin-film capacitor, silicon nitride medium is filled between two metal polar plates.
6. absorption-type low-pass filter according to claim 1, it is characterised in that: resistance R is made of chrome-nickel.
7. absorption-type low-pass filter according to claim 1, it is characterised in that: inductance L1, inductance L2, inductance L3, electricity
Hold C1, capacitor C2, capacitor C3 and resistance R to be integrated on HR-Si substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822047693.6U CN209046602U (en) | 2018-12-07 | 2018-12-07 | A kind of absorption-type low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822047693.6U CN209046602U (en) | 2018-12-07 | 2018-12-07 | A kind of absorption-type low-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209046602U true CN209046602U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822047693.6U Active CN209046602U (en) | 2018-12-07 | 2018-12-07 | A kind of absorption-type low-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629513A (en) * | 2020-12-09 | 2022-06-14 | 海能达通信股份有限公司 | Receiving circuit, absorption filter, and receiver |
-
2018
- 2018-12-07 CN CN201822047693.6U patent/CN209046602U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629513A (en) * | 2020-12-09 | 2022-06-14 | 海能达通信股份有限公司 | Receiving circuit, absorption filter, and receiver |
| CN114629513B (en) * | 2020-12-09 | 2024-03-15 | 海能达通信股份有限公司 | Receiving circuit, absorption filter and receiver |
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