Miniature Ka frequency band gain equalizer circuit

Abstract

The utility model discloses a miniature Ka frequency band gain equalizer circuit, and belongs to the technical field of equalizers. Comprising a dielectric plate, a thin-film resistor and a resonance unit arranged on the dielectric plate, the resonance unit comprises a main microstrip line, a coupling resonance branch knot and at least two groups of open-circuit resonance branch knots, the main microstrip line, the coupling resonance branch knot and the open-circuit resonance branch knots are all installed on the dielectric plate, and the input end of the main microstrip line is connected with an input port transmission line of an equalizer. The output end of the main microstrip line is connected with an output port transmission line of the equalizer, each group of open-circuit resonance branches is connected with one side of the middle part of the main microstrip line through a thin-film resistor, and the coupling resonance branches are arranged on the other side of the middle part of the main microstrip line in parallel. According to the utility model, the required equalization curve is fitted by superposing the open-circuit resonance branch knot and the coupling resonance branch knot, so that the requirement of a Ka frequency band power amplifier or a communication system on amplitude equalization can be better met.

Description

Technical Field

[0001] This utility model belongs to the field of equalizer technology, specifically relating to a small Ka-band gain equalizer circuit. Background Technology

[0002] With the development of new materials and the rapid advancement of radio frequency and microwave technologies, testing equipment such as EMC and electromagnetic compatibility tests, as well as various communication equipment systems, place higher demands on the amplitude-frequency response of power amplifier products. To achieve greater power output, modern power amplifiers typically use a combination of multiple low-power power amplifier modules. Signals transmit through complex multi-path paths, and devices or subsystems will have different responses to signals of different frequencies or even the same frequency. When these signals are combined into a single output, they inevitably interfere with each other, resulting in a passband waveform filled with fluctuations. The flatness of the output power within the frequency band is a crucial technical indicator for power amplifier systems, directly affecting the overall system performance. Excessive fluctuations in the transmitted signal power can affect the phase parameter correction of the antenna or the safe operation of the combiner and other components in the system. Utility Model Content

[0003] Purpose of this utility model: To provide a small Ka-band gain equalizer circuit that solves the aforementioned problems existing in the prior art.

[0004] Technical Solution: A small Ka-band gain equalizer circuit includes a dielectric substrate, a thin-film resistor, and a resonant unit mounted on the dielectric substrate. The resonant unit includes a main microstrip line, coupled resonant stubs, and at least two sets of open-circuit resonant stubs. The main microstrip line, coupled resonant stubs, and open-circuit resonant stubs are all mounted on the dielectric substrate. The input end of the main microstrip line is connected to the input port transmission line of the equalizer, and the output end of the main microstrip line is connected to the output port transmission line of the equalizer. Each set of open-circuit resonant stubs is connected to one side of the middle of the main microstrip line through a thin-film resistor. Each set of open-circuit resonant stubs works with the main microstrip line to reduce the modulation of signals with large input fluctuations. The coupled resonant stubs are placed parallel to the other side of the middle of the main microstrip line. The gap capacitance between the coupled resonant stubs and the main microstrip line increases the modulation of signals with small input fluctuations.

[0005] Preferably, the main microstrip line includes an input wide microstrip line segment, a narrow microstrip line segment, and an output wide microstrip line segment. The input end of the input wide microstrip line segment is connected to the input port transmission line of the equalizer. The output end of the input wide microstrip line segment is connected to the input end of the narrow microstrip line segment. The output end of the narrow microstrip line segment is connected to the input end of the output wide microstrip line segment. The output end of the output wide microstrip line segment is connected to the output port transmission line of the equalizer.

[0006] Preferably, the coupled resonant stub includes a sixth microstrip line and a seventh microstrip line. The sixth microstrip line is placed parallel to one side of the narrow microstrip segment of the main microstrip line, and a gap is reserved between the sixth microstrip line and the narrow microstrip segment. One end of the sixth microstrip line away from the narrow microstrip segment is connected to a thin-film resistor, and the thin-film resistor is connected to the seventh microstrip line. The seventh microstrip line is parallel to the sixth microstrip line.

[0007] Preferably, each group of open-circuit resonant stubs is parallel to each other and sequentially perpendicularly connected to the narrow microstrip line segment of the main microstrip line. The open-circuit resonant stub includes a secondary microstrip line, one end of which is perpendicularly connected to the narrow microstrip line through a thin-film resistor, and the other end of which is open-circuit, forming an open-circuit resonant stub. Multiple groups of open-circuit resonant stubs are symmetrically distributed on both sides of the vertical centerline of the main microstrip line.

[0008] Preferably, the dielectric substrate is made of alumina ceramic with a dielectric constant of 9.8.

[0009] Preferably, the main microstrip line, the sixth microstrip line, and the seventh microstrip line are all gold-plated with a thickness of 0.035 mm and a length of 3-5 mm.

[0010] Preferably, the submicrostrip line is gold-plated with a thickness of 0.035 mm and a length of 3-5 mm.

[0011] Preferably, the thin-film resistor is made of tantalum nitride material and has a resistance range of 25 to 200 Ω.

[0012] Beneficial effects: This utility model relates to a small Ka-band gain equalizer circuit, which uses thin-film resistors to load open-circuit resonant stubs and coupled resonant stubs. The required equalization curve is obtained by superimposing the open-circuit resonant stubs and coupled resonant stubs, which can better meet the amplitude equalization requirements of Ka-band power amplifiers or communication systems. The open-circuit resonant stubs introduce reverse fluctuation compensation in the region to avoid affecting the performance of other frequency bands. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is the overall circuit diagram of this utility model;

[0015] Figure 3 The transmission curve to be balanced in this utility model;

[0016] Figure 4 This is the equalized transmission curve of this utility model;

[0017] Figure 5The results are the port standing wave test results of this utility model.

[0018] Figures 1 to 2 The reference numerals in the attached diagram are: 1. Main microstrip line; 2. Secondary microstrip line; 3. Seventh microstrip line; 4. Sixth microstrip line. Detailed Implementation

[0019] like Figures 1 to 5 As shown, this utility model provides a technical solution: a small Ka-band gain equalizer circuit, including a dielectric substrate, a thin-film resistor, and a resonant unit disposed on the dielectric substrate. The dielectric substrate is made of alumina ceramic with a dielectric constant of 9.8. The thin-film resistor is made of tantalum nitride material with a resistance range of 25–200 Ω. In this embodiment, the dielectric substrate thickness is 0.127 mm, and the thin-film resistor has a resistance of 50 Ω. The resonant unit includes a main microstrip line 1, coupled resonant stubs, and at least two sets of open-circuit resonant stubs. The main microstrip line 1 is gold-plated with a thickness of 0.035 mm and a length of 3–5 mm. Figure 1 As shown, the main microstrip line 1, coupled resonant stubs, and open-circuit resonant stubs are all mounted on the dielectric substrate. The main microstrip line 1 includes an input wide microstrip segment, a narrow microstrip segment, and an output wide microstrip segment. The input terminal of the input wide microstrip segment is connected to the input port transmission line of the equalizer. The output terminal of the input wide microstrip segment is connected to the input terminal of the narrow microstrip segment. The output terminal of the narrow microstrip segment is connected to the input terminal of the output wide microstrip segment. The output terminal of the output wide microstrip segment is connected to the output port transmission line of the equalizer. Each set of open-circuit resonant stubs is connected to one side of the middle of the main microstrip line 1 through a thin-film resistor. Each set of open-circuit resonant stubs works with the main microstrip line 1 to reduce the amplitude of signals with large input fluctuations. The coupled resonant stubs are placed parallel to the other side of the middle of the main microstrip line 1. The circuit diagram is shown below. Figure 2 As shown, the gap capacitance between the coupled resonant stub and the main microstrip line 1 increases the modulation of signals with small input fluctuations. That is, the open-circuit resonant stub and the coupled resonant stub are loaded with thin-film resistors. The equalization curve required in the Ka band is obtained by superimposing the open-circuit resonant stub and the coupled resonant stub. This can better meet the amplitude equalization requirements of Ka band power amplifiers or communication systems. The open-circuit resonant stub introduces reverse fluctuation compensation in the region to avoid affecting the performance of other frequency bands.

[0020] In a further embodiment, the coupled resonant stub includes a sixth microstrip line 4 and a seventh microstrip line 3. Both the sixth microstrip line 4 and the seventh microstrip line 3 are gold-plated with a thickness of 0.035 mm and a length of 3-5 mm. The sixth microstrip line 4 is placed parallel to one side of the narrow microstrip segment of the main microstrip line 1, with a gap reserved between the sixth microstrip line 4 and the narrow microstrip segment. One end of the sixth microstrip line 4, away from the narrow microstrip segment, is connected to a thin-film resistor, which is connected to the seventh microstrip line 3. The other ends of the sixth microstrip line 4 and the seventh microstrip line 3 are both open circuits. The seventh microstrip line 3 is parallel to the sixth microstrip line 4, thus forming an open-circuit coupled resonant stub. The gap capacitance between the coupled resonant stub and the main microstrip line 1 affects the signal transmission in the main microstrip line 1. Depending on the different microstrip line lengths, larger fluctuations can be formed at predetermined positions within the microstrip line.

[0021] In a further embodiment, each group of open-circuit resonant stubs is parallel to each other and sequentially perpendicularly connected to the narrow microstrip segment of the main microstrip line 1. The open-circuit resonant stub includes a secondary microstrip line 2, which is gold-plated with a thickness of 0.035 mm and a length of 3-5 mm. One end of the secondary microstrip line 2 is perpendicularly connected to the narrow microstrip line through a thin-film resistor, and the other end of the secondary microstrip line 2 is open-circuited, forming an open-circuit resonant stub. Multiple groups of open-circuit resonant stubs are symmetrically distributed on both sides of the vertical centerline of the main microstrip line 1. Each group of open-circuit resonant stubs cooperates with the main microstrip line 1 to reduce the amplitude of signals with large input fluctuations.

[0022] Through the above technical solution, the present invention can achieve the following working process:

[0023] The dielectric substrate material is alumina ceramic with a dielectric constant of 9.8. The substrate dimensions are 3*4*0.127mm. The lengths of the main microstrip line 1, secondary microstrip line 2, sixth microstrip line 4, and seventh microstrip line 3 are all approximately λ / 8, with a thickness of 0.035mm and gold plating. The thin-film resistor is made of tantalum nitride, and its resistance is calculated and adjusted to 50Ω according to the equalization requirements. This involves using thin-film resistors to load open-circuit resonant stubs and coupled resonant stubs, and then using the superposition of these open-circuit and coupled resonant stubs to fit the required equalization curve in the Ka operating frequency band. Figure 3 and Figure 4 , Figure 5 As shown, within the Ka operating frequency band, this embodiment achieves an overall equalization of 10dB within the band and 15dB in a small area requiring a large equalization, with a port VSWR of <1.6, achieving very good performance indicators and meeting the requirements for overall power amplifier gain equalization.

[0024] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solution of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A compact Ka-band gain equalizer circuit comprising a dielectric slab, a thin film resistor and a resonant cell disposed on the dielectric slab, characterized in that, The resonant unit includes a main microstrip line (1), a coupled resonant stub, and at least two sets of open-circuit resonant stubs. The main microstrip line (1), coupled resonant stubs, and open-circuit resonant stubs are all mounted on the dielectric substrate. The input end of the main microstrip line (1) is connected to the input port transmission line of the equalizer, and the output end of the main microstrip line (1) is connected to the output port transmission line of the equalizer. Each set of open-circuit resonant stubs is connected to one side of the middle of the main microstrip line (1) through a thin film resistor. Each set of open-circuit resonant stubs cooperates with the main microstrip line (1) to reduce the modulation of signals with large input fluctuations. The coupled resonant stubs are placed parallel to the other side of the middle of the main microstrip line (1). The gap capacitance between the coupled resonant stubs and the main microstrip line (1) increases the modulation of signals with small input fluctuations.

2. A compact Ka-band gain equalizer circuit according to claim 1, characterized in that The main microstrip line (1) includes an input wide microstrip line segment, a narrow microstrip line segment, and an output wide microstrip line segment. The input end of the input wide microstrip line segment is connected to the input port transmission line of the equalizer. The output end of the input wide microstrip line segment is connected to the input end of the narrow microstrip line segment. The output end of the narrow microstrip line segment is connected to the input end of the output wide microstrip line segment. The output end of the output wide microstrip line segment is connected to the output port transmission line of the equalizer.

3. A compact Ka-band gain equalizer circuit according to claim 2, characterized in that The coupled resonant stub includes a sixth microstrip line (4) and a seventh microstrip line (3). The sixth microstrip line (4) is placed parallel to one side of the narrow microstrip segment of the main microstrip line (1). A gap is reserved between the sixth microstrip line (4) and the narrow microstrip segment. One end of the sixth microstrip line (4) is connected to a thin film resistor on the side away from the narrow microstrip segment. The thin film resistor is connected to the seventh microstrip line (3). The seventh microstrip line (3) is parallel to the sixth microstrip line (4).

4. A compact Ka-band gain equalizer circuit according to claim 2, characterized in that Each group of open-circuit resonant stubs is parallel to each other and connected vertically to the narrow microstrip line segment of the main microstrip line (1). The open-circuit resonant stub includes a secondary microstrip line (2). One end of the secondary microstrip line (2) is vertically connected to the narrow microstrip line through a thin film resistor. The other end of the secondary microstrip line (2) is open-circuit, forming an open-circuit resonant stub. Multiple groups of open-circuit resonant stubs are symmetrically distributed on both sides of the vertical centerline of the main microstrip line (1).

5. A compact Ka-band gain equalizer circuit according to claim 1, characterized in that, The dielectric substrate is made of alumina ceramic with a dielectric constant of 9.

8.

6. A compact Ka-band gain equalizer circuit according to claim 3, characterized in that The main microstrip line (1), the sixth microstrip line (4) and the seventh microstrip line (3) are all gold-plated with a thickness of 0.035 mm and a length of 3~5 mm.

7. A compact Ka-band gain equalizer circuit according to claim 4, characterized in that The submicrostrip line (2) is gold-plated with a thickness of 0.035 mm and a length of 3-5 mm.

8. A compact Ka-band gain equalizer circuit according to any one of claims 1-7, characterized in that, The thin-film resistor is made of tantalum nitride material and has a resistance range of 25 to 200 Ω.

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