GaAs IPD-based symmetrical-structure S-band filter

Abstract

The invention discloses a symmetrical structure S-band filter based on GaAs IPD, which belongs to the technical field of microwaves and comprises a first-order series resonance circuit, a coupling capacitor C1, a grounding inductor L2, a coupling capacitor C2, a second-order parallel resonance, a third-order parallel resonance, a grounding capacitor C6, a coupling capacitor C7, a fourth-order parallel resonance, a grounding capacitor C66, a fifth-order parallel resonance, a coupling capacitor C22 and a grounding inductor L22. And a coupling capacitor C11 and a sixth-order series resonance. The third-order parallel resonance and the fourth-order parallel resonance can improve the low-frequency out-of-band suppression degree of the band-pass filter; the first-order series resonance and the sixth-order series resonance as well as the second-order parallel resonance and the fifth-order parallel resonance can improve the high-frequency out-of-band suppression degree of the band-pass filter.

Description

Technical Field

[0001] The invention relates to the field of microwave technology, in particular to a symmetrical structure S-band filter based on GaAs IPD. Background Art

[0002] Bandpass filters have frequency selection functions and are important passive components in communication systems. The main benefit of bandpass filters is that they can selectively allow signals within a certain frequency range to pass through while suppressing signals below and above this frequency range. This characteristic makes bandpass filters widely used in many fields, including electronic communications, audio processing, biomedical engineering, and image processing. By suppressing unwanted frequency components, bandpass filters can improve the clarity and quality of signals and reduce noise and interference. In audio processing, bandpass filters can be used to enhance the frequency range that the human ear is most sensitive to, providing a richer auditory experience. In complex electronic systems, bandpass filters help analyze and control signals of specific frequencies, such as extracting the spectrum near the resonance point in the resonance suppression control of a three-phase LCL inverter. In fields such as atmospheric science, bandpass filters are used to filter weather data within a specific time range to help researchers analyze scientific issues such as climate change.

[0003] For existing narrowband S-band filters, the size of the inductor Q value has a great impact on the key performance indicators of the filter. The out-of-band suppression difference of the S-band filter is relatively large, which affects its use effect. Summary of the invention

[0004] With regard to the above problems existing in the prior art, the object of the present invention is to provide a symmetrical structure S-band filter based on GaAs IPD to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A symmetrical structure S-band filter based on GaAs IPD, comprising a first-order series resonant circuit, a coupling capacitor C1, a grounding inductor L2, a coupling capacitor C2, a second-order parallel resonant circuit, a third-order parallel resonant circuit, a grounding capacitor C6, a coupling capacitor C7, a fourth-order parallel resonant circuit, a grounding capacitor C66, a fifth-order parallel resonant circuit, a coupling capacitor C22, a grounding inductor L22, a coupling capacitor C11 and a sixth-order series resonant circuit;

[0007] The coupling capacitor C1, coupling capacitor C2, second-order parallel resonance, coupling capacitor C7, fifth-order parallel resonance, coupling capacitor C22, and coupling capacitor C11 are connected in series in sequence, and one end of the coupling capacitor C1 is connected to one end of the first-order series resonance circuit, the connected node constitutes the input end of the filter, and the output end of the first-order series resonance circuit is grounded; the other end of the coupling capacitor C1 is connected to one end of the coupling capacitor C2 and one end of the grounding inductor L2, and the output end of the grounding inductor L2 is grounded;

[0008] The input end of the second-order parallel resonance circuit is connected to the other end of the coupling capacitor C2, the output end of the second-order parallel resonance circuit is connected to the input end of the third-order parallel resonance circuit and one end of the coupling capacitor C7, the output end of the third-order parallel resonance is connected to one end of the grounding capacitor C6, and the other end of the grounding capacitor C6 is grounded;

[0009] The other end of the coupling capacitor C7 is connected to the input end of the fourth-order parallel resonant circuit and the input end of the fifth-order parallel resonant circuit, the output end of the fourth-order parallel resonant circuit is connected to one end of the grounding capacitor C66, and the other end of the grounding capacitor C66 is grounded;

[0010] The output end of the fifth-order parallel resonant circuit is connected to one end of the coupling capacitor C22, the other end of the coupling capacitor C22 is connected to one end of the grounding inductor L22 and one end of the coupling capacitor C11, and the other end of the grounding inductor L22 is grounded;

[0011] The other end of the coupling capacitor C11 is connected to the input end of the sixth-order series resonant circuit, and the connection node constitutes the output end of the filter. The sixth-order series resonant output end is grounded.

[0012] As a further solution of the present invention: the first-order series resonant circuit comprises a spiral winding inductor L1 and a capacitor C5 connected in series, one end of the capacitor C5 is connected to one end of the coupling capacitor C, the other end of the capacitor C5 is connected to one end of the spiral winding inductor L1, and the other end of the spiral winding inductor L1 is grounded;

[0013] The sixth-order series resonant circuit includes a spiral winding inductor L11 and a capacitor C55 connected in series, one end of the capacitor C55 is connected to the other end of the coupling capacitor C22, the other end of the capacitor C55 is connected to one end of the spiral winding inductor L11, and the other end of the spiral winding inductor L11 is grounded;

[0014] The inductor L1 and the inductor L11 have the same inductance value, and the capacitor C5 and the capacitor C55 are both MIM capacitors with the same capacitance value.

[0015] As a further solution of the present invention: the coupling capacitor C1, coupling capacitor C2, coupling capacitor C7, coupling capacitor C11, and coupling capacitor C22 are all MIM capacitors, and the coupling capacitor C1 and coupling capacitor C11 have the same capacitance, and the coupling capacitor C2 and coupling capacitor C22 have the same capacitance.

[0016] As a further solution of the present invention: the grounding inductor L2 and the grounding inductor L22 are both in the form of planar spiral windings, and the grounding inductor L2 and the grounding inductor L22 have the same inductance value.

[0017] As a further solution of the present invention: the second-order parallel resonant circuit includes a spiral winding inductor L3 and a capacitor C3 in parallel, and the fifth-order parallel resonant circuit includes a spiral winding inductor L33 and a capacitor C33 in parallel, the inductor L3 and the inductor L33 have the same inductance value, and the capacitor C3 and the capacitor C33 are both MIM capacitors with the same capacitance value.

[0018] As a further solution of the present invention: the third-order parallel resonant circuit includes a spiral winding inductor L4 and a capacitor C4 in parallel, and the fourth-order parallel resonant circuit includes a spiral winding inductor L44 and a capacitor C44 in parallel, the inductor L4 and the inductor L44 have the same inductance value, and the capacitor C4 and the capacitor C44 are both MIM capacitors with the same capacitance value.

[0019] As a further solution of the present invention: the grounding capacitor C6 and the grounding capacitor C66 are both MIM capacitors, and the grounding capacitor C6 and the grounding capacitor C66 have the same capacitance.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with the prior art, the coupling capacitor C1, coupling capacitor C2, coupling capacitor C7, coupling capacitor C11 and coupling capacitor C22 of the present invention will respectively affect the return loss of the bandpass filter. The third-order parallel resonance and the fourth-order parallel resonance will improve the low-frequency out-of-band suppression of the bandpass filter; the first-order series resonance and the sixth-order series resonance, the second-order parallel resonance and the fifth-order parallel resonance will improve the high-frequency out-of-band suppression of the bandpass filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The schematic diagram of the circuit principle of a symmetrical structure S-band filter based on GaAs IPD disclosed in the embodiment.

[0023] Figure 2 The circuit layout of a symmetrical structure S-band filter based on GaAs IPD disclosed in an embodiment.

[0024] Figure 3 The figure is a schematic diagram of parameter curves in a symmetrical structure S-band filter based on GaAs IPD disclosed in an embodiment. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1-3 , a symmetrical structure S-band filter based on GaAs IPD, including a first-order series resonant circuit, a coupling capacitor C1, a grounding inductor L2, a coupling capacitor C2, a second-order parallel resonant circuit, a third-order parallel resonant circuit, a grounding capacitor C6, a coupling capacitor C7, a fourth-order parallel resonant circuit, a grounding capacitor C66, a fifth-order parallel resonant circuit, a coupling capacitor C22, a grounding inductor L22, a coupling capacitor C11 and a sixth-order series resonant circuit;

[0028] The coupling capacitor C1, coupling capacitor C2, second-order parallel resonance, coupling capacitor C7, fifth-order parallel resonance, coupling capacitor C22, and coupling capacitor C11 are connected in series in sequence, and one end of the coupling capacitor C1 is connected to one end of the first-order series resonance circuit, the connected node constitutes the input end of the filter, and the output end of the first-order series resonance circuit is grounded; the other end of the coupling capacitor C1 is connected to one end of the coupling capacitor C2 and one end of the grounding inductor L2, and the output end of the grounding inductor L2 is grounded;

[0029] The input end of the second-order parallel resonance circuit is connected to the other end of the coupling capacitor C2, the output end of the second-order parallel resonance circuit is connected to the input end of the third-order parallel resonance circuit and one end of the coupling capacitor C7, the output end of the third-order parallel resonance is connected to one end of the grounding capacitor C6, and the other end of the grounding capacitor C6 is grounded;

[0030] The other end of the coupling capacitor C7 is connected to the input end of the fourth-order parallel resonant circuit and the input end of the fifth-order parallel resonant circuit, the output end of the fourth-order parallel resonant circuit is connected to one end of the grounding capacitor C66, and the other end of the grounding capacitor C66 is grounded;

[0031] The output end of the fifth-order parallel resonant circuit is connected to one end of the coupling capacitor C22, the other end of the coupling capacitor C22 is connected to one end of the grounding inductor L22 and one end of the coupling capacitor C11, and the other end of the grounding inductor L22 is grounded;

[0032] The other end of the coupling capacitor C11 is connected to the input end of the sixth-order series resonant circuit, and the connection node constitutes the output end of the filter. The sixth-order series resonant output end is grounded.

[0033] In the embodiment provided by the present invention, the first-order series resonant circuit comprises a spiral winding inductor L1 and a capacitor C5 connected in series, one end of the capacitor C5 is connected to one end of the coupling capacitor C, the other end of the capacitor C5 is connected to one end of the spiral winding inductor L1, and the other end of the spiral winding inductor L1 is grounded;

[0034] The sixth-order series resonant circuit includes a spiral winding inductor L11 and a capacitor C55 connected in series, one end of the capacitor C55 is connected to the other end of the coupling capacitor C22, the other end of the capacitor C55 is connected to one end of the spiral winding inductor L11, and the other end of the spiral winding inductor L11 is grounded;

[0035] The inductor L1 and the inductor L11 have the same inductance value, and the capacitor C5 and the capacitor C55 are both MIM capacitors with the same capacitance value.

[0036] In the embodiment provided by the present invention, coupling capacitor C1, coupling capacitor C2, coupling capacitor C7, coupling capacitor C11, and coupling capacitor C22 are all MIM capacitors, and coupling capacitor C1 and coupling capacitor C11 have the same capacitance, and coupling capacitor C2 and coupling capacitor C22 have the same capacitance.

[0037] In the embodiment provided by the present invention, the ground inductor L2 and the ground inductor L22 are both in the form of planar spiral windings, and the ground inductor L2 and the ground inductor L22 have the same inductance value.

[0038] In the embodiment provided by the present invention, the second-order parallel resonant circuit includes a spiral winding inductor L3 and a capacitor C3 connected in parallel, and the fifth-order parallel resonant circuit includes a spiral winding inductor L33 and a capacitor C33 connected in parallel, the inductor L3 and the inductor L33 have the same inductance value, and the capacitor C3 and the capacitor C33 are both MIM capacitors with the same capacitance value.

[0039] In the embodiment provided by the present invention, the third-order parallel resonant circuit includes a spiral winding inductor L4 and a capacitor C4 in parallel, and the fourth-order parallel resonant circuit includes a spiral winding inductor L44 and a capacitor C44 in parallel, the inductor L4 and the inductor L44 have the same inductance value, and the capacitor C4 and the capacitor C44 are both MIM capacitors with the same capacitance value.

[0040] In the embodiment provided by the present invention, both the grounding capacitor C6 and the grounding capacitor C66 are MIM capacitors, and the grounding capacitor C6 and the grounding capacitor C66 have the same capacitance.

[0041] In one embodiment, multiple metal layers are stacked from top to bottom, with the upper layer being the metal layer, the middle layer being the dielectric layer, and the bottom layer being the grounded lower metal layer.

[0042] like Figure 2 As shown, the input and output ends of the filter, inductor L1, inductor L2, inductor L3, inductor L4, inductor L11, inductor L22, inductor L33, inductor L44, coupling capacitor C1, coupling capacitor C2, coupling capacitor C7, coupling capacitor C11, coupling capacitor C2, capacitor C4, capacitor C5, capacitor C44, and capacitor C55 are arranged on the upper multi-metal layer;

[0043] In one embodiment, the input end and the output end are respectively connected to the two ends of the lower metal plate, the input end of the filter is connected to the coupling capacitor C1 and the lower metal plate of the capacitor C5; the other pole of the coupling capacitor C1 is connected to one end of the grounding inductor L2 and the lower metal plate of the coupling capacitor C2 through the upper metal transmission line; the upper metal plate of the capacitor C5 is connected to one end of the inductor L1; the upper metal plate of the coupling capacitor C2 is connected to one end of the inductor L3 and the lower metal plate of the capacitor C3 through the metal transmission line; the other end of the inductor L3 is connected to the upper metal plate of the capacitor C6 and the lower metal plate of the coupling capacitor C7; the lower metal plate of the capacitor C6 is connected to the One end is connected to the lower metal plate of capacitor C4, and the other end of inductor L4 is grounded through a metal through-hole; the upper metal plate of coupling capacitor C7 is connected to capacitor C66, the upper metal plate of capacitor C33 and one end of inductor L33; the lower metal plate of capacitor C66 is connected to one end of inductor L44 and the lower metal plate of capacitor C44; the other end of inductor L33 is connected to the upper metal plate of coupling capacitor C22, and the lower metal plate of coupling capacitor C22 is connected to one end of grounded inductor L22 and the upper metal plate of coupling capacitor C11 through a metal transmission line; the lower metal plate of coupling capacitor C11 is connected to the lower metal plate of capacitor C55 and the output end of the filter.

[0044] In one of the embodiments, with the longitudinal axis where the coupling capacitor C7 is located as the central axis, the inductor L1 and the inductor L11 are symmetrically arranged relative to the central axis, the inductor L2 and the inductor L22 are symmetrically arranged relative to the central axis, the inductor L3 and the inductor L33 are symmetrically arranged relative to the central axis, and the inductor L4 and the inductor L44 are symmetrically arranged relative to the central axis; the capacitor C1 and the capacitor C11 are symmetrically arranged relative to the central axis, the capacitor C2 and the capacitor C22 are symmetrically arranged relative to the central axis, the capacitor C3 and the capacitor C33 are symmetrically arranged relative to the central axis, the capacitor C4 and the capacitor C44 are symmetrically arranged relative to the central axis, the capacitor C5 and the capacitor C55 are symmetrically arranged relative to the central axis, and the capacitor C6 and the capacitor C66 are symmetrically arranged relative to the central axis.

[0045] like Figure 3 The figure shows the schematic simulation and layout simulation curves of the S-band bandpass filter. It can be found that the pre-simulation results and post-simulation results are basically consistent. In the simulation results, it can be seen that the bandpass filter has an in-band loss of 2.9dB at the center frequency of 3.1GHz, and the return loss is below -20dB. The out-of-band suppression is -20dB at 2.8G, and -18dB at 3.4G, with a passband range of 2.95GHz to 3.25GHz. The simulation results show that the design has excellent performance such as narrow frequency band, low insertion loss, and high out-of-band suppression.

[0046] The present invention provides a design method of a symmetrical structure S-band filter based on GaAs IPD, comprising a first-order series resonance circuit, a coupling capacitor C1, a grounding inductor L2, a coupling capacitor C2, a second-order parallel resonance, a third-order parallel resonance, a grounding capacitor C6, a coupling capacitor C7, a fourth-order parallel resonance, a grounding capacitor C66, a fifth-order parallel resonance, a coupling capacitor C22, a grounding inductor L22, a coupling capacitor C11, and a sixth-order series resonance. The third-order parallel resonance and the fourth-order parallel resonance can improve the low-frequency out-of-band suppression of the bandpass filter; the first-order series resonance and the sixth-order series resonance, the second-order parallel resonance and the fifth-order parallel resonance can improve the high-frequency out-of-band suppression of the bandpass filter.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention, and any reference numerals in the claims should not be considered as limiting the claims involved.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A symmetrical structure S-band filter based on GaAs IPD, characterized in that: It includes a first-order series resonant circuit, a coupling capacitor C1, a grounding inductor L2, a coupling capacitor C2, a second-order parallel resonant circuit, a third-order parallel resonant circuit, a grounding capacitor C6, a coupling capacitor C7, a fourth-order parallel resonant circuit, a grounding capacitor C66, a fifth-order parallel resonant circuit, a coupling capacitor C22, a grounding inductor L22, a coupling capacitor C11 and a sixth-order series resonant circuit; The coupling capacitor C1, coupling capacitor C2, second-order parallel resonance, coupling capacitor C7, fifth-order parallel resonance, coupling capacitor C22, and coupling capacitor C11 are connected in series in sequence, and one end of the coupling capacitor C1 is connected to one end of the first-order series resonance circuit, the connected node constitutes the input end of the filter, and the output end of the first-order series resonance circuit is grounded; the other end of the coupling capacitor C1 is connected to one end of the coupling capacitor C2 and one end of the grounding inductor L2, and the output end of the grounding inductor L2 is grounded; The input end of the second-order parallel resonance circuit is connected to the other end of the coupling capacitor C2, the output end of the second-order parallel resonance circuit is connected to the input end of the third-order parallel resonance circuit and one end of the coupling capacitor C7, the output end of the third-order parallel resonance is connected to one end of the grounding capacitor C6, and the other end of the grounding capacitor C6 is grounded; The other end of the coupling capacitor C7 is connected to the input end of the fourth-order parallel resonant circuit and the input end of the fifth-order parallel resonant circuit, the output end of the fourth-order parallel resonant circuit is connected to one end of the grounding capacitor C66, and the other end of the grounding capacitor C66 is grounded; The output end of the fifth-order parallel resonant circuit is connected to one end of the coupling capacitor C22, the other end of the coupling capacitor C22 is connected to one end of the grounding inductor L22 and one end of the coupling capacitor C11, and the other end of the grounding inductor L22 is grounded; The other end of the coupling capacitor C11 is connected to the input end of the sixth-order series resonant circuit, and the connection node constitutes the output end of the filter. The sixth-order series resonant output end is grounded.

2. A symmetrical structure S-band filter based on GaAs IPD according to claim 1, characterized in that: The first-order series resonant circuit comprises a spiral winding inductor L1 and a capacitor C5 connected in series, one end of the capacitor C5 is connected to one end of the coupling capacitor C, the other end of the capacitor C5 is connected to one end of the spiral winding inductor L1, and the other end of the spiral winding inductor L1 is grounded; The sixth-order series resonant circuit includes a spiral winding inductor L11 and a capacitor C55 connected in series, one end of the capacitor C55 is connected to the other end of the coupling capacitor C22, the other end of the capacitor C55 is connected to one end of the spiral winding inductor L11, and the other end of the spiral winding inductor L11 is grounded; The inductor L1 and the inductor L11 have the same inductance value, and the capacitor C5 and the capacitor C55 are both MIM capacitors with the same capacitance value.

3. A symmetrical structure S-band filter based on GaAs IPD according to claim 2, characterized in that: The coupling capacitor C1, coupling capacitor C2, coupling capacitor C7, coupling capacitor C11 and coupling capacitor C22 are all MIM capacitors, and the coupling capacitor C1 and coupling capacitor C11 have the same capacitance, and the coupling capacitor C2 and coupling capacitor C22 have the same capacitance.

4. The symmetrical structure S-band filter based on GaAs IPD according to claim 3, characterized in that: The grounding inductor L2 and the grounding inductor L22 are both in the form of planar spiral windings, and the grounding inductor L2 and the grounding inductor L22 have the same inductance value.

5. The symmetrical structure S-band filter based on GaAs IPD according to claim 4, characterized in that: The second-order parallel resonant circuit includes a spiral winding inductor L3 and a capacitor C3 in parallel, and the fifth-order parallel resonant circuit includes a spiral winding inductor L33 and a capacitor C33 in parallel, the inductor L3 and the inductor L33 have the same inductance value, and the capacitor C3 and the capacitor C33 are both MIM capacitors with the same capacitance value.

6. The symmetrical structure S-band filter based on GaAs IPD according to claim 5, characterized in that: The third-order parallel resonant circuit includes a spiral winding inductor L4 and a capacitor C4 in parallel, and the fourth-order parallel resonant circuit includes a spiral winding inductor L44 and a capacitor C44 in parallel. The inductor L4 and the inductor L44 have the same inductance value, and the capacitor C4 and the capacitor C44 are both MIM capacitors with the same capacitance value.

7. The symmetrical structure S-band filter based on GaAs IPD according to claim 6, characterized in that: The grounding capacitor C6 and the grounding capacitor C66 are both MIM capacitors, and the grounding capacitor C6 and the grounding capacitor C66 have the same capacitance.

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