L-band 10-watt high-power frequency hopping filter
By using a second-order bandpass filter structure and optimized material design, the problems of complex structure and insufficient performance of existing L-band harmonic filters are solved, achieving high selectivity and high harmonic suppression, which is suitable for high-power frequency hopping radios in the L-band.
Patent Information
- Application Number
- CN202520046308.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing L-band harmonic filters are complex in structure, difficult to debug, consume a lot of power, and have limited selectivity and harmonic suppression effects, making it difficult to meet the high-performance requirements of modern communication systems.
A second-order bandpass filter structure is adopted, using components such as a 50-ohm interface inductor, a single-tuned inductor, and a coupled inductor. By optimizing material selection and connection methods, a simplified resonant circuit is formed, which enhances the selective and harmonic suppression effects.
It features a simple structure, convenient debugging, high selectivity and high harmonic suppression, is suitable for mass production, ensures stability and reliability under high power conditions, and is suitable for L-band high-power frequency hopping radios.
Smart Images
Figure CN223713947U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of filters, in particular to an L-band 10-watt high-power frequency hopping filter. BACKGROUND
[0002] In an L-band high-power frequency hopping radio station, a harmonic filter is a key device to ensure the purity of the transmitted signal and prevent adjacent station interference. Due to the wide application of L-band frequency range, the transmitted signal often contains a large number of harmonic components, which can interfere with the communication equipment in the adjacent frequency band, and even affect the stability of the entire communication system. Therefore, the main function of the harmonic filter is to suppress the harmonic components in the transmitted signal through selective filtering, while ensuring the pure transmission of the main frequency signal.
[0003] As shown in Figure 1 The existing L-band harmonic filter usually adopts a combination of two low-pass filters and a 1 / 2 radio frequency switch. Specifically, this filter attenuates high-frequency harmonics through a low-pass filter, and then distributes the signal to different filtering paths through a radio frequency switch to achieve selective filtering of specific frequencies. However, this design has the following problems: first, the combination of two low-pass filters and a radio frequency switch results in a complex filter structure, increasing the difficulty of design and debugging; second, the introduction of a radio frequency switch not only increases the power consumption of the system, but also reduces the reliability of the filter, especially under high-power conditions, the radio frequency switch is prone to failure due to overheating or breakdown; in addition, the production cycle of this filter is longer, making it difficult to meet the needs of mass production, and its selectivity and harmonic suppression effect are limited, making it difficult to meet the requirements of modern communication systems for high-performance filters. CONTENT OF THE INVENTION
[0004] The purpose of the present application is to at least overcome one of the deficiencies of the prior art, to provide a harmonic filter with simple structure, easy debugging, low production difficulty, and high selectivity, high harmonic suppression, and high reliability, suitable for harmonic filtering applications in L-band high-power frequency hopping radio stations.
[0005] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: an L-band 10-watt high-power frequency hopping filter, the filter comprising a first 50-ohm interface inductor and a second 50-ohm interface inductor, a first single-tuned inductor, a second single-tuned inductor, a third single-tuned inductor, and a fourth single-tuned inductor, a first single-tuned capacitor and a second single-tuned capacitor, and a coupling inductor.
[0006] One end of the first 50-ohm interface inductor is used to connect an external 50-ohm transmission line or a 50-ohm port of a radio frequency device, and the other end is connected to the connection end of the first single-tuned inductor and the first single-tuned capacitor.
[0007] One end of the first single-tuned inductor is connected to the non-external end of the first 50-ohm interface inductor and the non-ground end of the first single-tuned capacitor, and the other end is connected to the non-ground end of the second single-tuned inductor.
[0008] The non-ground end of the second single-tuned inductor is connected to one end of the first single-tuned inductor and the coupling inductor.
[0009] The non-ground end of the third single-tuned inductor is connected to the non-ground end of the fourth single-tuned inductor and one end of the coupling inductor, and the other end is connected to the non-ground end of the second single-tuned capacitor and the non-external end of the second 50-ohm interface inductor.
[0010] The non-ground end of the fourth single-tuned inductor is connected to the third single-tuned inductor and one end of the coupling inductor.
[0011] Further, the first 50-ohm interface inductor and the second 50-ohm interface inductor are preferably 0.5mm enameled wire single-wire non-winding inductors with equal inductance values, used to achieve impedance matching and signal transmission. The first single-tuned inductor, the second single-tuned inductor, the third single-tuned inductor, and the fourth single-tuned inductor are preferably 3mm copper column inductors with equal inductance values, used to achieve the resonance function of the filter.
[0012] Further, the coupling inductor is preferably a 0.5mm enameled wire single-wire non-winding inductor, used to achieve coupling between inductors and improve the performance of the filter. The first single-tuned capacitor and the second single-tuned capacitor are preferably high-Q, COG material, 1111 package, 500V voltage withstand multilayer ceramic capacitors with equal capacitance values, used to cooperate with single-tuned inductors to achieve frequency tuning function.
[0013] Compared with the prior art, the present application has at least one of the following beneficial effects:
[0014] Simplified structure: the 2nd order band-pass filter structure is adopted, reducing the complex low-pass filter and radio frequency switch design in the traditional filter, and reducing the structural complexity and debugging difficulty.
[0015] Performance optimization: By coupling the design of inductor Lm1, the selectivity and harmonic suppression effect of the filter are improved, while the center frequency tuning function is realized, effectively preventing adjacent channel interference.
[0016] Convenient production: Optimized material selection and process design, reducing production difficulty and improving production efficiency, suitable for large-scale production.
[0017] High reliability: The use of high-Q, COG material, and stacked ceramic capacitors and copper column inductors ensures the stability and reliability of the filter under high power conditions.
[0018] Small volume and high power capacity: Through compact structural design, smaller volume and higher RF power capacity are achieved, suitable for L-band high-power frequency hopping radio application scenarios.
[0019] In summary, the frequency hopping filter of the present application solves the problems of complex structure, difficult debugging, and large production difficulty in the prior art, while achieving high selectivity, high harmonic suppression, and high reliability. It has wide application prospects and market value.
[0020] The above-listed benefits are not exhaustive of all advantages. Other potential benefits and detailed technical implementations will be further disclosed in the embodiments or other description sections of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0021] After reading the specific embodiments below in conjunction with the accompanying drawings, the aspects of the present disclosure will be better understood, and the positions, sizes, and ranges of the structures shown in the drawings, etc. are sometimes not representative of actual positions, sizes, and ranges, etc. In the drawings:
[0022] Figure 1 The circuit topology of the low-pass filter on the market;
[0023] Figure 2 The circuit topology of an embodiment disclosed in the present application; DETAILED DESCRIPTION
[0024] The present disclosure will be described below with reference to the accompanying drawings, which show several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully inform those skilled in the art of the scope of protection of the present disclosure. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.
[0025] It should be understood that like drawing reference numerals refer to like elements throughout the several views of the drawings. In the drawings, the sizes of some of the features can be exaggerated for clarity.
[0026] It should be understood that the language used in the specification has been principally selected for readability and instructional purposes and can not have been selected to delineate or circumscribe the patent rights recourseable to the disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used in the specification are to be interpreted as is customary in the art. For the purposes of the present disclosure, the terms "comprises", "comprising", "includes", "including" and "has" or "having" are inclusive (meaning and / or). The terms "preferably" and "preferred" are not superlatives and are merely intended to convey that the listed steps, features, devices, components, materials, or the like are examples of possible steps, features, devices, components, materials, or the like, and other steps, features, devices, components, materials, or the like are / are also possible.
[0027] As used in the description, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the term "includes" or "containing" means that other steps, features, devices, components, materials, or the like can also be present. The use of the term "and / or" includes any and all combinations of one or more of the associated listed items. Embodiments
[0028] Referring to the drawings Figure 2 The filter of the present embodiment is composed of a first 50-ohm interface inductor Lio1, a second 50-ohm interface inductor Lio2, a first single-tuned inductor Lr1, a second single-tuned inductor Lr2, a third single-tuned inductor Lr3, a fourth single-tuned inductor Lr4, a first single-tuned capacitor Cr1, a second single-tuned capacitor Cr2, and a coupling inductor Lm1. These components are connected in a specific manner to form a 2nd-order bandpass filter structure, which is used to realize the harmonic filtering function of the L-band high-power frequency hopping radio. The first 50-ohm interface inductor Lio1 and the second 50-ohm interface inductor Lio2 are respectively located at the input and output ends of the filter, and their main function is to realize impedance matching, ensuring efficient transmission of radio frequency signals at the input and output ends, and reducing signal reflection and loss. One end of the first 50-ohm interface inductor Lio1 is connected to an external 50-ohm transmission line or a 50-ohm port of a radio frequency device, and the other end is connected to the connection end of the first single-tuned inductor Lr1 and the first single-tuned capacitor Cr1. One end of the second 50-ohm interface inductor Lio2 is connected to an external 50-ohm transmission line or a 50-ohm port of a radio frequency device, and the other end is connected to the connection end of the third single-tuned inductor Lr3 and the second single-tuned capacitor Cr2. Through this design, the first 50-ohm interface inductor Lio1 and the second 50-ohm interface inductor Lio2 can effectively match the input and output impedances, ensuring the transmission efficiency of the signals in the filter.
[0029] In the embodiment, the first single-tuned inductor Lr1, the second single-tuned inductor Lr2, the third single-tuned inductor Lr3 and the fourth single-tuned inductor Lr4 are core resonant elements of the filter, used to form resonant circuits in cooperation with the first single-tuned capacitor Cr1 and the second single-tuned capacitor Cr2, to realize selective filtering of specific frequencies. The first single-tuned inductor Lr1 and the second single-tuned inductor Lr2 are located in the front half of the filter, and the third single-tuned inductor Lr3 and the fourth single-tuned inductor Lr4 are located in the rear half of the filter. One end of the first single-tuned inductor Lr1 is connected to the non-external end of the first 50-ohm interface inductor Lio1 and the non-ground end of the first single-tuned capacitor Cr1, and the other end is connected to the non-ground end of the second single-tuned inductor Lr2; the third single-tuned inductor Lr3 is connected to the non-ground end of the fourth single-tuned inductor Lr4 and one end of the coupling inductor Lm1, and the other end is connected to the non-ground end of the second single-tuned capacitor Cr2 and the non-external end of the second 50-ohm interface inductor Lio2. These inductors form resonant points in cooperation with the capacitors through their own inductive properties, to realize selective passing of the center frequency of the L band while suppressing other frequency components.
[0030] In the embodiment, the first single-tuned capacitor Cr1 and the second single-tuned capacitor Cr2 cooperate with the first single-tuned inductor Lr1, the second single-tuned inductor Lr2, the third single-tuned inductor Lr3 and the fourth single-tuned inductor Lr4 to form resonant circuits, to realize frequency tuning functions.
[0031] The first single-tuned capacitor Cr1 cooperates with the first single-tuned inductor Lr1 and the second single-tuned inductor Lr2 to form a resonant circuit in the front half; and the second single-tuned capacitor Cr2 cooperates with the third single-tuned inductor Lr3 and the fourth single-tuned inductor Lr4 to form a resonant circuit in the rear half. By adjusting the capacitance values of the first single-tuned capacitor Cr1 and the second single-tuned capacitor Cr2, the center frequency of the filter can be adjusted to adapt to different working frequency bands.
[0032] The first single-tuned capacitor Cr1 and the second single-tuned capacitor Cr2 are multilayer ceramic capacitors with high Q value, COG material, 1111 package and 500V voltage resistance, having the characteristics of low loss and high stability, and being able to maintain stable performance under high frequency and high power conditions.
[0033] In this embodiment, the coupling inductor Lm1 is the key coupling element of the filter, used to realize the energy coupling between the second single-tuned inductor Lr2 and the fourth single-tuned inductor Lr4, enhancing the selectivity and bandwidth of the filter. One end of the coupling inductor Lm1 is connected to the non-ground end of the second single-tuned inductor Lr2 and one end of the first single-tuned inductor Lr1, and the other end is connected to the non-ground end of the fourth single-tuned inductor Lr4 and one end of the third single-tuned inductor Lr3. Through the coupling effect of the coupling inductor Lm1, the front half and the back half of the filter can work together, further improving the performance of the filter. The coupling inductor Lm1 uses a 0.5mm enameled wire single-wire non-winding inductor, which has the characteristics of low loss and high coupling efficiency, and can effectively improve the harmonic suppression effect of the filter.
[0034] In practical applications, the L-band 10-watt high-power frequency hopping filter of this embodiment can achieve higher resonance frequency, smaller size and higher radio frequency power capacity through the above structural design and material selection. For example, in an L-band high-power frequency hopping radio, this filter can effectively suppress harmonic interference and improve signal purity. At the same time, through the tunable function of the center frequency, it prevents adjacent channel interference and enhances communication security. Compared with the traditional 2-section low-pass filter and 1 / 2 radio frequency switch filter, the filter structure of this embodiment is simpler, easier to debug, and the production difficulty is significantly reduced, while having higher selectivity and harmonic suppression effect.
[0035] The working principle of this embodiment is as follows: when the radio frequency signal is input through the first 50-ohm interface inductor Lio1, the signal first passes through the resonance circuit of the first single-tuned inductor Lr1 and the first single-tuned capacitor Cr1, realizing preliminary frequency selection and harmonic suppression. Subsequently, the signal passes through the coupling effect of the coupling inductor Lm1 with the second single-tuned inductor Lr2 and the fourth single-tuned inductor Lr4, further filtering out unwanted frequency components. Finally, the signal passes through the resonance circuit of the third single-tuned inductor Lr3 and the second single-tuned capacitor Cr2, and is output to the second 50-ohm interface inductor Lio2, completing the entire filtering process. The design of the coupling inductor Lm1 enables the filter to maintain high selectivity while achieving wider bandwidth and higher harmonic suppression effect.
[0036] In terms of design principles, this embodiment optimizes the layout and connection method of inductors and capacitors, reducing the complex low-pass filter and radio frequency switch design in traditional filters, reducing structural complexity and debugging difficulty. At the same time, high-Q inductors and capacitor materials are used to ensure the stability and reliability of the filter under high power conditions. In addition, the compact structural design makes the filter smaller in size, suitable for space-limited application scenarios.
[0037] It should be noted that the parts not disclosed in detail in the present embodiment, such as the specific winding process of the first 50-ohm interface inductor Lio1 and the second 50-ohm interface inductor Lio2, the copper column processing method of the first single-tuned inductor Lr1 to the fourth single-tuned inductor Lr4, and the packaging process of the first single-tuned capacitor Cr1 and the second single-tuned capacitor Cr2, etc., all belong to the known technology or prior art of those skilled in the art, and do not need to be described in detail in the present embodiment. The specific implementation of these technologies can be adjusted and optimized according to the actual application requirements, but will not affect the core technical scheme and implementation effect of the present embodiment.
[0038] In summary, the L-band 10-watt high-power frequency hopping filter of the present embodiment realizes the technical effects of simple structure, convenient debugging, low production difficulty, excellent selectivity and harmonic suppression effect through innovative structural design and optimal material selection, is suitable for harmonic filtering applications of L-band high-power frequency hopping radios, and has wide market prospects and application value.
[0039] Although the exemplary embodiments of the present disclosure have been described, it should be understood that those skilled in the art can make various changes and modifications to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included in the protection scope of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and the equivalents of these claims are also included.
Claims
1. An L-band 10 watt high power frequency hopping filter characterized by: The first 50-ohm interface inductor, the second 50-ohm interface inductor, the first single-tuned inductor, the second single-tuned inductor, the third single-tuned inductor, the fourth single-tuned inductor, the first single-tuned capacitor, the second single-tuned capacitor, and the coupling inductor are connected in series. One end of the first 50-ohm interface inductor is connected to an external 50-ohm transmission line or a 50-ohm port of a radio frequency device, and the other end is connected to the connection end of the first single-tuned inductor and the first single-tuned capacitor; one end of the second 50-ohm interface inductor is connected to an external 50-ohm transmission line or a 50-ohm port of a radio frequency device, and the other end is connected to the connection end of the third single-tuned inductor and the second single-tuned capacitor. One end of the first single-tuned inductor is connected to the non-external end of the first 50-ohm interface inductor and the non-ground end of the first single-tuned capacitor, and the other end is connected to the non-ground end of the second single-tuned inductor. The non-ground end of the second single-tuned inductor is connected to one end of the first single-tuned inductor and the coupling inductor. One end of the coupling inductor is connected to the non-ground end of the second single-tuned inductor and one end of the first single-tuned inductor, and the other end is connected to the non-ground end of the fourth single-tuned inductor and one end of the third single-tuned inductor. The third single-tuned inductor is connected to the non-ground end of the fourth single-tuned inductor and one end of the coupling inductor, and the other end is connected to the non-ground end of the second single-tuned capacitor and the non-external end of the second 50-ohm interface inductor. The non-ground end of the fourth single-tuned inductor is connected to the third single-tuned inductor and one end of the coupling inductor. The non-external end of the second 50-ohm interface inductor is connected to the non-ground end of the second single-tuned capacitor and one end of the third single-tuned inductor.
2. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The inductance values of the first 50-ohm interface inductor and the second 50-ohm interface inductor are equal.
3. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The inductance values of the first single-tuned inductor and the third single-tuned inductor are equal.
4. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The inductance values of the second single-tuned inductor and the fourth single-tuned inductor are equal.
5. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The capacitance values of the first single-tuned capacitor and the second single-tuned capacitor are equal.
6. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The first 50-ohm interface inductor and the second 50-ohm interface inductor are 0.5mm enameled wire single-wire non-winding inductors; the first single-tuned inductor and the second single-tuned inductor are 3mm copper column inductors; the third single-tuned inductor and the fourth single-tuned inductor are 3mm copper column inductors; and the coupling inductor is a 0.5mm enameled wire single-wire non-winding inductor.
7. The L-band 10 watt high power frequency hopping filter of claim 1, wherein: The first single-tuned capacitor and the second single-tuned capacitor are high-Q, COG material, 1111 package, 500V voltage-resistant stacked ceramic capacitors.