CN106785264A - A kind of sawtooth grooves microwave band-pass filter - Google Patents

Abstract

The invention discloses a kind of sawtooth grooves microwave band-pass filter, wherein, including the filtering chamber that the dieelctric sheet set by two panels balance is formed, the opposite face of microwave input port and microwave output end is arranged with guided wave curved surface on dieelctric sheet described in two panels, the filtering groove surface for filtering is arranged with the middle part opposite face of dieelctric sheet described in two panels, described guided wave curved surface is the curved surface of the exponential type curve structure set along microwave transmission direction, described filtering groove surface is the multiple filtering grooves set in the vertical microwave transmission direction of dieelctric sheet opposite face, the groove face of the filtering groove is zigzag.A kind of sawtooth grooves microwave band-pass filter of the invention can fully improve the constraint effect of microwave band sub-wavelength so that wave filter anti-electromagnetic interference capability is more preferable.

Description

A Zigzag Groove Microwave Bandpass Filter

technical field

The present invention relates to an artificial surface plasmon type microwave filter, and more specifically relates to a sawtooth groove microwave band-pass filter.

Background technique

With the advent of the era of big data, the demand for information is growing explosively. The field of mobile communication requires the manufacture of microwave devices with higher integration. However, as the size of microwave integrated circuits continues to shrink, a series of technical problems have emerged. , including electromagnetic interference noise caused by ultra-small transmission line spacing, RC delay reaching the limit and causing unstable operation of microwave devices and other issues. Compared with ordinary microwave dielectric devices, artificial surface plasmon microwave devices have special properties, such as stronger anti-electromagnetic interference ability, higher sensitivity and greater bandwidth advantages, and can break through diffraction The limit realizes the miniaturization of the device (such as nanometer size) and so on. Therefore, the existing microwave devices cannot adapt to the development of today's large-scale microwave integrated circuits. Based on this technical background, it is urgent to invent a new type of artificial surface plasmon microwave filter.

Contents of the invention

The object of the present invention is to provide a sawtooth groove microwave bandpass filter, which can fully improve the sub-wavelength confinement effect in the microwave band, so that the filter has better anti-electromagnetic interference ability.

The technical scheme that the present invention adopts is as follows:

A saw-tooth groove microwave bandpass filter, which includes a filter cavity formed by two balanced dielectric sheets, and waveguide curved surfaces are symmetrically arranged on the opposite faces of the microwave input end and the microwave output end of the two dielectric sheets A filter groove surface for filtering is symmetrically arranged on the opposite sides of the middle parts of the two dielectric sheets, and the waveguide curved surface is a curved surface with an exponential curve structure arranged along the microwave transmission direction, and the filter groove The surface is a plurality of filter grooves arranged on the opposite surface of the dielectric sheet perpendicular to the microwave transmission direction, and the groove surfaces of the filter grooves are zigzag.

Further, the exponential curve equation of the guided wave surface is:

y=d+p*(exp(a*x/L1-1)/(exp(a)-1)

Among them, d is the position coefficient of the exponential curve, the value is 0.5~15mm, p and a are the shape coefficients of the exponential curve, among them, the value of p is 0.2~8mm, the value of k is 1~30mm, L1 is the guided wave along the microwave The length in the transport direction.

Further, a plurality of filter grooves are evenly arranged, the groove surface width of the filter groove is 1-4mm, the groove surface height of the filter groove is 1-4mm, and the distance between two adjacent filter grooves is The distance is 3 ~ 7mm.

Further, the length of the filter groove surface along the microwave transmission direction is 90-130 mm, the width of the filter groove surface perpendicular to the microwave transmission direction is 11-16 mm, and the length of the waveguide curved surface along the microwave transmission direction is 11 mm. ~14mm.

Further, the length of the dielectric sheet perpendicular to the microwave transmission direction is 12-52 mm, and the thickness of the dielectric sheet is 0.3-0.7 mm.

Further, the filter grooves on the two dielectric sheets are mirror-symmetrical.

Compared with prior art, the beneficial effect that the present invention has is:

A sawtooth groove microwave bandpass filter of the present invention, which includes a filter cavity formed by two balanced dielectric sheets, symmetrically arranged on the opposite surfaces of the microwave input end and the microwave output end of the two dielectric sheets The wave-guiding curved surface is symmetrically provided with a filtering groove surface for filtering in the middle of the two dielectric sheets. The said wave-guiding curved surface is a curved surface with an exponential curve structure arranged along the microwave transmission direction. The said The filter groove surface is a plurality of filter grooves arranged on the opposite surface of the dielectric sheet perpendicular to the microwave transmission direction, and the groove surfaces of the filter grooves are zigzag. The waveguide curved surface is used to realize the input or output of microwave signals, and multiple zigzag filter groove structures are used in the filter groove surface, which improves the sub-wavelength binding effect of the microwave band and makes the filter more resistant to electromagnetic interference. excellent.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the S parameter characteristic curve diagram of the specific embodiment of the present invention;

Fig. 3 is a diagram of electric field distribution in the normal direction of a specific embodiment of the present invention.

detailed description

The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments, but this does not constitute any limitation to the present invention.

With reference to shown in Figure 1, a kind of sawtooth groove microwave bandpass filter of the present invention is characterized in that, comprises the filter cavity that is formed by the dielectric sheet 1 that two pieces of balance are arranged, on two described dielectric sheets 1 microwave input The waveguide curved surface 2 is symmetrically arranged on the opposite surface of the end and the microwave output end, and the filter groove surface 3 for filtering is symmetrically arranged on the opposite surface of the middle part of the two dielectric sheets 1, and the waveguide curved surface 2 is along the The curved surface of the exponential curve structure arranged in the microwave transmission direction, the filter groove surface 3 is a plurality of filter grooves 4 arranged perpendicular to the microwave transmission direction on the opposite surface of the dielectric sheet 1, and the groove surface of the filter groove 4 is Serrated. The waveguide curved surface is used to realize the input or output of the microwave signal, and a plurality of zigzag filter groove 4 structures are used in the filter groove surface, which improves the sub-wavelength binding effect of the microwave band, and makes the filter bandwidth and anti-electromagnetic interference Ability is more excellent. Therefore, a sawtooth groove microwave bandpass filter of the present invention can be applied to civil microwave communication systems in the L-S band, and has certain engineering practical value.

The filter of the present invention pre-counts the geometric dimensions of the arc-shaped filter groove 4 according to customer needs, and then selects a filter with a suitable size filter groove 4, which can accurately control the passband range and stopband suppression characteristics of the filter . Moreover, the arc-shaped filtering groove 4 structure does not increase the overall geometric size of the filter, and further optimizes the filtering characteristics of the band-pass filter while ensuring miniaturization.

Adjusting the geometric size of the zigzag filter groove 4 can precisely adjust the passband range and stopband suppression characteristics of the filter. As the size of the filter groove 4 increases, the high frequency cutoff frequency of the filter decreases, and the passband range continues to increase. decrease. Moreover, the zigzag filter groove 4 structure does not increase the overall geometric size of the filter, and further optimizes the filter characteristics of the bandpass filter while ensuring miniaturization.

The exponential curve equation of the waveguide curved surface 2 is:

y=d+p*(exp(a*x/L1-1)/(exp(a)-1)

Among them, d is the position coefficient of the exponential curve, the value is 0.5~15mm, p and a are the shape coefficients of the exponential curve, among them, the value of p is 0.2~8mm, the value of k is 1~30mm, L1 is the 2 edge of the guided wave surface The length in the microwave propagation direction. The waveguide curved surface 2 adopts an exponential curve structure to prevent sudden changes in electromagnetic impedance and achieve a good connection with the filter groove surface 3 .

A plurality of filter grooves 4 are evenly arranged, the groove surface width of the filter groove 4 is 1-4mm, the groove surface height of the filter groove 4 is 1-4mm, and two adjacent filter grooves 4 The distance between them is 3-7mm, and the passband range of the filter can be adjusted by setting the zigzag filter groove 4, and the electromagnetic field can be tightly bound to prevent electromagnetic interference.

The length L2 of the filter groove surface 3 along the microwave transmission direction is 90-130 mm, the width of the filter groove surface 3 perpendicular to the microwave transmission direction is 11-16 mm, and the length of the waveguide curved surface 2 along the microwave transmission direction is 11-14mm, using the guided wave surface 2 can achieve a good match between the electromagnetic field impedance and the mode.

The length of the dielectric sheet 1 perpendicular to the microwave transmission direction is 12-52 mm, and the thickness of the dielectric sheet 1 is 0.3-0.7 mm. The filter grooves 4 on the two dielectric sheets 1 are mirror-symmetrical, so that the confinement effect of the sub-wavelength in the microwave band is better.

Example

The structure of the microwave filter of this embodiment is the same as that of the embodiment. The dielectric sheet 1 adopts a substrate with a dielectric constant of 2.65. The physical dimension data of each part of a sawtooth groove microwave bandpass filter of the present invention As shown in Table 1:

Table 1 The physical dimensions of each part of the microwave filter (unit: mm)

The physical size data is shown in Table 1. The filter characteristic curve of the microwave filter is calculated by time-domain finite difference, as shown in Figure 2. The filter center frequency is 7.56GHz, where the insertion loss is 1.52dB, and the -3dB passband is 1.78 ～13.33GHz, the reflection in the passband is less than -10.0dB, and the ripple jitter is less than 0.67dB. According to Figure 3, the filter is a stop band in the range of 13.598-16.073GHz, and its transmission constant S21 is less than 30dB in this frequency band. The physical size data is obtained when the microwave filter works at 3GHz as shown in Table 1 The electric field distribution diagram in the line direction is shown in Fig. 3. According to Fig. 3, when the filter works in the passband, its microwave electric field is mainly bound around the arc-shaped filter groove 4, and there is little leakage, which effectively improves the anti-electromagnetic interference capability of the filter.

The above descriptions are only preferred embodiments of the present invention, and any modifications, equivalent replacements and improvements made within the spirit and scope of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a kind of sawtooth grooves microwave band-pass filter, it is characterised in that the dieelctric sheet (1) including being set by two panels balance is formed Filtering chamber, the opposite face of microwave input port and microwave output end is arranged with guided wave curved surface on dieelctric sheet described in two panels (1) (2), the middle part opposite face in dieelctric sheet described in two panels (1) is arranged with the filtering groove surface (3) for filtering, described guided wave Curved surface (2) is the curved surface of the exponential type curve structure set along microwave transmission direction, and described filtering groove surface (3) is in medium Multiple filtering groove (4) that the vertical microwave transmission direction of piece (1) opposite face is set, the groove face of filtering groove (4) is sawtooth Shape.

2. a kind of sawtooth grooves microwave band-pass filter according to claim 1, it is characterised in that described guided wave curved surface (2) exponential curve equation is：

Y=d+p* (exp (a*x/L1-1)/(exp (a) -1)

Wherein d is exponential curve position parameter, and value is 0.5~15mm, and p, a are exponential curve form factor, wherein, p takes It is 0.2~8mm to be worth, and k values are 1~30mm, and L1 is length of the guided wave curved surface (2) along microwave transmission direction.

3. a kind of sawtooth grooves microwave band-pass filter according to claim 1, it is characterised in that the filtering described in multiple Groove (4) is uniformly arranged, and the groove face width of filtering groove (4) is 1~4mm, and the groove face of the filtering groove (4) is highly Distance between 1~4mm, two neighboring filtering groove (4) is 3~7mm.

4. a kind of sawtooth grooves microwave band-pass filter according to claim 1, it is characterised in that the filtering groove surface (3) it is 90~130mm along the length in microwave transmission direction, the width in the vertical microwave transmission direction of the filtering groove surface (3) is 11~16mm, the guided wave curved surface (2) is 11~14mm along the length in microwave transmission direction.

5. a kind of sawtooth grooves microwave band-pass filter according to claim 1, it is characterised in that the dieelctric sheet (1) The length in vertical microwave transmission direction is 12~52mm, and the thickness of the dieelctric sheet (1) is 0.3~0.7mm.

6. a kind of sawtooth grooves microwave band-pass filter according to claim 1, it is characterised in that dieelctric sheet described in two panels (1) filtering groove (4) specular on.