CN115020952B - Miniaturized plane matching load - Google Patents
Miniaturized plane matching load Download PDFInfo
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- CN115020952B CN115020952B CN202210561023.4A CN202210561023A CN115020952B CN 115020952 B CN115020952 B CN 115020952B CN 202210561023 A CN202210561023 A CN 202210561023A CN 115020952 B CN115020952 B CN 115020952B
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- lossy
- electromagnetic energy
- interdigital band
- interdigital
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/26—Dissipative terminations
- H01P1/268—Strip line terminations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/26—Dissipative terminations
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Abstract
The invention relates to a miniaturized planar matching load, which is realized by cascading a plurality of lossy interdigital band-pass filters and comprises a metal micro-strip layer, a dielectric substrate and a metal grounding plate; the electromagnetic energy of the microwave signal is gradually absorbed by the lossy dielectric substrate and converted into heat energy in the process of passing through the lossy interdigital band-pass filter; the miniaturized planar matching load is easy to integrate with other circuits; the method is based on the distributed transmission line design, has accurate model and can be applied to millimeter wave/terahertz circuits and systems; the method has the advantages of low cost, small size, low section, easy integration, easy processing, simple assembly and the like, and has wide application prospect in systems such as microwave measurement, wireless communication, radar and the like.
Description
Technical Field
The invention relates to a miniaturized planar matching load.
Background
The matching load is an important single-port passive device, is commonly used in a microwave circuit, and has the main function of absorbing input electromagnetic energy and improving the matching performance of the circuit. At present, the common matching load forms comprise rectangular waveguide, circular waveguide, coaxial line and the like, and are widely used in systems such as microwave measurement systems, communication systems, radars and the like. With the development of a radio electronic system, the matching load of the traditional three-dimensional structural forms such as rectangular waveguide, circular waveguide and coaxial line is large in size, high in cost, difficult to process, difficult to integrate and the like, and is more and more difficult to adapt to the development requirement of high integration level of the system, and low-profile and planar devices and circuits are a development trend. Therefore, the study and development of low-cost, miniaturized, low-profile, planar matched loads are of great importance to the development of modern microwave circuits and systems.
The microstrip line is a typical planar transmission line, is widely used, is easy to process, and has a characteristic of high integration, and thus, a low-cost, miniaturized, low-profile, planar matching load based on the microstrip line form has an important application prospect.
Disclosure of Invention
The invention aims to provide a miniaturized planar matching load, which is based on lossy filter cascade, realizes a planar matching load in a microstrip form, has the advantages of low cost, small size, low section, easy integration, easy processing and assembly and is suitable for systems such as microwave measurement, wireless communication, radar and the like.
In order to achieve the purpose, the invention provides a miniaturized planar matching load for realizing the filtering characteristic based on the cascade connection of lossy interdigital band-pass filters. The specific technical scheme is as follows:
a miniaturized planar matching load is realized by cascading a plurality of lossy interdigital band-pass filters and comprises a metal micro-strip layer, a dielectric substrate and a metal grounding plate; the signal input end is an impedance 50 ohm microstrip line, and the terminal is short-circuited or open-circuited to form a single-port plane matching load; the dielectric substrate is a lossy dielectric substrate, the metal micro-strip layer is connected with the metal connection bottom plate through the metalized through hole, the metal micro-strip layer is arranged on the upper surface of the lossy dielectric substrate, and the metal grounding plate is arranged on the lower surface of the lossy dielectric substrate; the lossy interdigital band-pass filter consists of a plurality of quarter-wavelength microstrip resonators with one open end and one short circuit end, parallel coupling modes are adopted among the microstrip resonators, and the input/output ends of the lossy interdigital band-pass filter realize magnetic coupling with the microstrip resonators in a tapping mode; the lossy interdigital band-pass filters are cascaded through a section of microstrip line, and the miniaturized planar matched load realizes the absorption of microwave signal electromagnetic energy through the cascade of multi-stage lossy filters.
The working principle of the miniaturized plane matching load provided by the invention is as follows:
microwave signals are fed in from a signal input port of the miniaturized planar matched load and enter the cascaded lossy interdigital band-pass filters, part of electromagnetic energy of the microwave signals is absorbed by the lossy dielectric substrate and converted into heat energy in the process of passing through the lossy interdigital band-pass filters, and the residual electromagnetic energy of the microwave signals is continuously transmitted to the next lossy interdigital band-pass filter; the final residual microwave signal electromagnetic energy is reflected when reaching the terminal, the reflected electromagnetic energy is reversely transmitted to each lossy interdigital band-pass filter, the energy is respectively absorbed by each lossy interdigital band-pass filter and converted into heat energy, the final residual microwave signal electromagnetic energy is very small and can be ignored when being reversely transmitted to the input end, and therefore good impedance matching of the input port is achieved, meanwhile, the electrical length of the whole matching load is greatly shortened on the basis of the slow wave effect of the high-order strong coupling filter, and only about 2 waveguide wavelengths exist.
The miniaturized plane matching load provided by the invention is easy to integrate with other circuits; the method is based on the distributed transmission line design, has accurate model and can be applied to millimeter wave/terahertz circuits and systems; the method has the advantages of low cost, small size, low section, easy integration, easy processing, simple assembly and the like, and has wide application prospect in systems such as microwave measurement, wireless communication, radar and the like.
Drawings
FIG. 1 is a front view of a miniaturized planar matched load structure as proposed by the present invention;
FIG. 2 is an S-parameter simulation curve of a miniaturized planar matched load of an embodiment;
corresponding names are identified in the drawings:
the metal microstrip layer, (2) the dielectric substrate, (3) the signal input end, (4) the multistage interdigital filter, (5) the metallized through hole.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The miniaturized planar matched load structure of this embodiment is shown in fig. 1, and its terminals are open-circuited, and the circuit is implemented using an FR-4 dielectric substrate with a loss tangent of 0.02, a dielectric constant of 4.4 and a thickness of 0.4 mm. And 6 interdigital filters are cascaded, wherein the interdigital filters are 7-order broadband bandpass filters, and the center frequency is 8.5GHz. Microwave signals enter the cascaded lossy interdigital filter from the input port of 50 omega, after the terminal is reflected, the energy of the microwave signals is almost completely absorbed by the miniaturized planar matching load when the microwave signals reach the input port in a backward transmission mode.
Fig. 2 is an S-parameter simulation curve of the input port of the miniaturized planar matched load of the present embodiment. As can be seen, the input return loss of the miniaturized planar matched load is about 20dB in the frequency range of 6.86GHz-10.05GHz (relative bandwidth of 37%), and the total electrical length of the miniaturized planar matched load is about 2 wavelengths.
Claims (4)
1. A miniaturized planar matched load, characterized by: the miniaturized planar matching load is based on a distributed transmission line design, and the model is accurate; the metal micro-strip layer is arranged on the upper surface of the lossy dielectric substrate, and the metal grounding plate is arranged on the lower surface of the lossy dielectric substrate; the metal micro-strip layer is formed by cascading a plurality of quarter-wavelength lossy interdigital band-pass filters, the impedance of an input end is 50 omega, a terminal is short-circuited or broken, a microwave signal enters the multistage lossy interdigital band-pass filters from the input end to reach the terminal and is reflected, electromagnetic energy is gradually absorbed by each lossy filter, and therefore a matched load with the filtering characteristic is achieved, meanwhile, the electrical length of the whole matched load is greatly shortened on the basis of the slow wave effect of a high-order strong coupling filter, and only about 2 waveguide wavelengths exist.
2. The miniaturized planar matched load of claim 1, which is implemented by cascading a plurality of lossy interdigital band-pass filters through microstrip lines, wherein each lossy interdigital band-pass filter consists of a plurality of quarter-wavelength microstrip resonators with one open end and one short circuit, and the microstrip resonators are coupled in parallel.
3. The miniaturized planar matched load of claim 2, wherein: in the process that the electromagnetic energy of the microwave signal passes through the lossy interdigital band-pass filter, one part of the electromagnetic energy is absorbed by the lossy dielectric substrate and converted into heat energy, and then the electromagnetic energy of the microwave signal is continuously transmitted to the next stage of lossy interdigital band-pass filter.
4. The miniaturized planar matched load of claim 3, wherein: finally, the electromagnetic energy of the residual microwave signals is reflected when reaching the terminal, the reflected electromagnetic energy is reversely transmitted to each lossy interdigital band-pass filter, the energy is respectively absorbed by each lossy interdigital band-pass filter and converted into heat energy, the electromagnetic energy is very small and can be ignored when the microwave signals are reversely transmitted to the input end, and therefore good impedance matching of the input port is achieved.
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| CN202210561023.4A CN115020952B (en) | 2022-08-08 | 2022-08-08 | Miniaturized plane matching load |
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| CN202210561023.4A CN115020952B (en) | 2022-08-08 | 2022-08-08 | Miniaturized plane matching load |
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| CN115020952A CN115020952A (en) | 2022-09-06 |
| CN115020952B true CN115020952B (en) | 2023-01-17 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377406A (en) * | 2014-09-01 | 2015-02-25 | 南京理工大学 | Microwave millimeter wave self-loading multi-orthogonal filter capable of inverting phase |
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| US20060142853A1 (en) * | 2003-04-08 | 2006-06-29 | Xingwu Wang | Coated substrate assembly |
| CN103928732A (en) * | 2014-05-07 | 2014-07-16 | 电子科技大学 | Micro-strip line absorption band-pass filter |
| CN104091986B (en) * | 2014-07-29 | 2017-01-18 | 西安电子科技大学 | Plane lossy filter of hybrid structure |
| EP3853941A1 (en) * | 2018-09-17 | 2021-07-28 | European Space Agency | A radio frequency pass-band filter |
| CN110212275B (en) * | 2019-07-15 | 2021-06-04 | 电子科技大学 | Millimeter wave waveguide matching load based on lossy dielectric substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104377406A (en) * | 2014-09-01 | 2015-02-25 | 南京理工大学 | Microwave millimeter wave self-loading multi-orthogonal filter capable of inverting phase |
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