JP3309578B2 - High frequency resonator and high frequency filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency resonator and a filter used in a high-frequency region such as a microwave band.

[0002]

2. Description of the Related Art In recent years, small and low-cost portable terminals have been actively developed in mobile communication. For this purpose, miniaturization of the radio unit circuit is indispensable, and miniaturization of the resonator, which occupies a particularly large volume in this radio unit,
There is a strong demand for higher performance. A quarter-wavelength resonator is widely used as a resonator having a strip or microstrip line structure as a resonator in a high-frequency band. However, since the size is larger than other components, the resonator is configured. Attempts have been made to reduce the size by changing the characteristic impedance of the line in a stepwise manner.

A conventional high frequency resonator having an impedance step will be described below. Here, a microstrip line resonator will be described as an example.

FIG. 12 is a perspective view showing a microstrip line resonator in which the characteristic impedance is changed stepwise.

In FIG. 12, 1 is a dielectric substrate, 2 is a microstrip line serving as a resonance element, 3 is a ground conductor,
4 is a ground conductor 3 formed on the front and back surfaces of the dielectric substrate 1.
Is a via hole.

In the above configuration, the characteristic impedance of the microstrip line 2 is changed stepwise by changing the line width of the microstrip line 2 stepwise.
By this example of thickening than the ground portion the thickness of the open portion of the microstrip line 2, and higher than the impedance Z ₂ of the open portion of the impedance Z ₁ of the ground portion is miniaturized resonator. With the above configuration, this resonance element operates as a quarter-wavelength resonator with one end open and the other end grounded.

[0007]

However, as the size of the portable terminal is reduced by integration of the radio section circuit,
A device using a resonator has a problem that even if the above-described conventional resonator is used, its shape is still larger than other components.

The present invention has been made to solve the above-mentioned conventional problems, and has been made to achieve both a reduction in the size of the resonator and a reduction in loss, a structure having harmonic suppression characteristics, and changing the conventional impedance in steps. An object of the present invention is to provide a high-frequency resonator having a smaller shape than a resonator and a small-sized high-frequency filter using the resonator.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a single line having a grounded strip or microstrip line, the open end of which is branched into a plurality of lines and bent. Grounded at its open end
The Rukoto be added capacity, constitute a compact high-frequency resonator of the characteristic impedance is changed stepwise at an open end side and the ground terminal side.

According to the present invention, the characteristic of the open end and the ground end is obtained by branching and bending the ground end of a single line composed of a strip or a microstrip line having one open end into a plurality of lines. The impedance is changed stepwise to form a small-sized high-frequency resonator with low loss.

The present invention further comprises a high-frequency resonator having the above-mentioned configuration, and an input / output coupling circuit connected to an external circuit, and the high-frequency resonator is arranged side by side such that an open end, a ground end, or a branch portion is adjacent to the high-frequency resonator. This constitutes a small-sized high-frequency filter.

[0012]

The characteristic impedance at the open end side of the line serving as the resonance element is made lower than that at the ground end side by the above-mentioned configuration, so that a resonator smaller than a quarter-wave resonator having a uniform impedance can be obtained. By making the open end side branch into multiple lines and bending them, it is possible to realize a resonator that is even smaller than conventional resonators whose impedance is changed stepwise. Yes, by combining these, a small-sized filter can be realized.

According to the present invention, the characteristic impedance at the ground end side of the single line is made lower than that at the open end side, so that a resonator having lower loss than a resonator having a uniform impedance can be obtained. Since the ground end side is branched into a plurality of lines and bent, a small-sized resonator having low loss can be realized. By combining these, a low-loss filter can be realized.

[0014]

【Example】

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a perspective view of a high-frequency resonator according to a first embodiment of the present invention. In FIG.
11 is a dielectric substrate, 12 is a microstrip line resonator, 121 is a ground end of the microstrip line resonator 12, 122 and 123 are open ends of the microstrip line resonator 12 branched into two, and 13 is a ground conductor. , 14 are ground conductors 13 formed on the front and back surfaces of the dielectric substrate 11.
Is a via hole.

The operation of the high-frequency resonator configured as described above will be described below. In the high frequency resonator of this embodiment shown in FIG. 1, the characteristic impedance of the open end portion and the ground end portion is changed at the branch portion of the line of the microstrip line resonator 12.

Referring to FIG. 2, the relationship between the conventional resonator shown in FIG. 12 and the resonator of this embodiment will be described.

FIG. 2A shows a resonator 22 having a conventional impedance step. In this example, the open end 220
Since the line width of the portion is wider than the line width of the ground end 221, the impedance of the open end 220 is lower than that of the ground end 221. Under such conditions, the length of the resonator is shortened, and the resonator is reduced in size as compared with a quarter-wave resonator having a uniform characteristic impedance.

FIG. 2 (b) shows an equivalent circuit of FIG. 2 (a). The impedance on the open end 220 side in FIG. 2A is equivalent to a parallel connection of a line having a higher impedance, that is, a line having a small line width. FIG. 2B shows an example in which two lines having an open end 222 and an open end 223 are connected in parallel.

FIG. 2C is a diagram showing a resonator according to the present embodiment. The circuit shown in FIG. 2B has two open ends 222 and 223.
Since each of the two lines is bent 180 degrees toward the ground end 221, the characteristic length of the lines changes stepwise, so that the resonator length is shortened to a quarter wavelength. In addition, a resonator having a small height is realized by bending the line at the open end toward the ground end.

As shown in FIG. 1, the reason why the line is cut obliquely at the bent portion of the line at the open end is to prevent impedance discontinuity other than at the branch portion.

In the high-frequency resonator shown in FIG. 1, the characteristic impedance is changed stepwise, so that the odd-order higher-order resonance frequency, which is a problem in the quarter-wave resonator, is multiplied by an odd number of the basic resonance frequency. This high-frequency resonator can have an effect of suppressing harmonics.

When the resonance frequency deviates from a desired frequency, the frequency can be easily adjusted by cutting off the open ends 122 to 123 and changing the length of the resonance line.

As described above, according to this embodiment, the characteristic impedance of the resonance element is stepped by branching the open ends 122 and 123 of the resonator into a plurality of lines and bending them. It is possible to realize a high-frequency resonator which is small and has excellent harmonic suppression characteristics.

In this embodiment, the embodiment in which the open end portion of the resonator is branched into two lines has been described. However, it is needless to say that the resonator may be branched into three or more lines. Moreover, the present invention can be realized even if the thicknesses and lengths of the branched lines are not equal to each other. Even if the plurality of branched lines are bent in arbitrary directions due to the space for disposing the resonators, the same characteristic can be obtained. It goes without saying that a vessel can be realized.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a perspective view of a high-frequency resonator according to a second embodiment of the present invention.

FIG. 3 is different from the configuration of FIG.
The point is that the grounded ends 322 and 323 of the microstrip line resonator 12 in FIG. 1 are branched into a plurality of lines instead of the open ends 122 and 123.

In FIG. 3, 31 is a dielectric substrate, 32 is a microstrip line resonator, 321 is an open end of the resonator 32, 322 and 323 are grounded ends of the resonator 32, 33 is a grounded conductor, and 34 is a dielectric. The via hole connects the ground conductor 33 formed on the front surface and the back surface of the substrate 31.

The operation of the high-frequency resonator configured as described above will be described below. The high-frequency resonator of this embodiment shown in FIG. 3 has an open end 321 and grounded ends 322 and 3.
Although the characteristic impedance of the 23 portion is changed at the branch portion of the line of the microstrip line resonator 32, the characteristic impedance of the ground terminals 322 and 323 is reduced by branching the ground terminals 322 and 323 into a plurality of lines. Since it is lower than the open end 321 side, the ground end 32 where the current becomes maximum in the microstrip line resonator 32
The conductor loss at the portions 2 and 323 is reduced, and a resonator having a high unloaded Q is realized. Normally, when the impedance of the open end 321 is higher than that of the ground ends 322 and 323, the resonator length becomes longer than that of a quarter-wave resonator with uniform impedance. A small shape is obtained by branching into a plurality of lines and bending at 180 degrees. As in the first embodiment, the reason why the line is cut obliquely at the bent portion is to prevent impedance discontinuity other than at the branch portion.

Since the characteristic impedance of the high-frequency resonator shown in FIG. 3 is changed stepwise, the odd-order high-order resonance frequency, which is a problem in the quarter-wavelength resonator, is multiplied by an odd number of the basic resonance frequency. This high-frequency resonator can have an effect of suppressing harmonics. When the resonance frequency deviates from a desired frequency, the open end 321 is cut off, and the resonance line length is changed.
Frequency adjustment is easy.

As described above, according to the present embodiment, the characteristic impedance of the resonance element is reduced by branching and bending the ground ends 322 and 323 of the microstrip line resonator 32 into a plurality of lines. It is possible to realize a small-sized high-frequency resonator which is partially changed and has low loss and excellent harmonic suppression characteristics.

In this embodiment, the embodiment in which the ground ends 322 and 323 of the microstrip line resonator 32 are branched into two lines has been described. However, it is possible to branch into three or more lines. Needless to say. Further, it is possible to realize even if the thicknesses and lengths of the branched lines are not equal to each other, and even if the plurality of branched lines are bent in arbitrary directions due to the arrangement space of the resonator, the position of the ground conductor, and the like. It goes without saying that a resonator having similar characteristics can be realized.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a plan view of a high-frequency resonator according to a third embodiment of the present invention as viewed from above. In FIG. 4, reference numeral 42 denotes a microstrip line resonator; 43, a ground conductor; and 45, a ground capacitance connecting the open end of the resonator 42 and the ground conductor 43.

The operation of the high-frequency resonator configured as described above will be described below. FIG. 4A shows a high-frequency resonator according to the first embodiment in which a grounding capacitor 45 is connected between two open ends and a grounding conductor. FIG.
(B) shows a configuration in which a ground capacitor 45 is connected between the open end of the high-frequency resonator shown in the second embodiment and a ground conductor. The basic operation is the same as in the first and second embodiments. By adding the ground capacitance 45, the length of the microstrip line resonator 42 can be further reduced, and the resonator becomes smaller as the capacitance value increases.

As described above, according to the present embodiment, by adding the ground capacitance 45 between the open end of the microstrip line resonator 42 and the ground conductor 43, it is possible to realize a more compact high-frequency resonator. is there.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a plan view of a high-frequency resonator according to a fourth embodiment of the present invention as viewed from above. In FIG. 5, 52 is a microstrip line resonator, 53 is a ground conductor, and 56 is a distributed coupling circuit provided between the open end of the resonator 52 and the ground conductor 53.

The operation of the high-frequency resonator configured as described above will be described below. FIG. 5A shows a configuration in which the open end of the high-frequency resonator shown in the first embodiment and the ground conductor 53 are distributed-coupled. FIG. 5B shows a distribution coupling between the open end of the high-frequency resonator shown in the second embodiment and a ground conductor. The basic operation is the first and second
This is the same as the embodiment. By providing the distributed coupling circuit 56, the length of the resonator 72 is further reduced, and the higher the degree of coupling of the distributed coupling circuit 56, the smaller the high-frequency resonator becomes.

As described above, according to the present embodiment, a more compact high-frequency resonator can be realized by adding the distributed coupling circuit 56 between the open end of the microstrip line resonator 52 and the ground conductor 53. It is.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a plan view and a sectional view of a high-frequency resonator according to a fifth embodiment of the present invention as viewed from above. In FIG. 6, 61 is a dielectric substrate,
62 is a microstrip line resonator, 63 is a ground conductor, 621 is a ground end of the resonator 62, 622 and 623 are open ends of the resonator 62, and 624 is a ground end 621 of the resonator 62.
Via holes for connecting the ground conductor 63 to the
2 is an overlay metal and 681 to 682 are overlay dielectrics.

The operation of the high-frequency resonator configured as described above will be described below. FIG. 6A shows a distribution coupling in which the open ends 622 and 623 of the high-frequency resonator shown in the first embodiment are brought close to the ground conductor 63.

FIG. 6B shows a structure in which the open ends 622 and 623 of the microstrip line resonator 62 are vertically coupled to the ground conductor 63 via the dielectric 61.

FIG. 6C shows A in FIG. 6B.
It is sectional drawing cut | disconnected by the -A 'line. As shown in this figure, by configuring the ground conductor 63 such that the vertical distance between the ground conductor 63 and the dielectric of the dielectric substrate 61 is narrowed only at the open end of the microstrip line resonator 62, The characteristic impedance of the open end portion of the resonator 62 is further reduced, and the entire size can be reduced.

FIG. 6D shows an open end 622 of the resonator 62,
623 and ground conductor 63 are overlaid with dielectrics 681, 68
2, overlay metal 671, 672 provided on top
Are distributed-coupled.

FIG. 6E shows B in FIG. 6D.
It is sectional drawing cut | disconnected by the -B 'line. Basic operation is first
This is the same as the embodiment. As described above, FIGS.
The length of the resonator 62 can be further reduced by the distributed coupling shown in (1), and the resonator becomes smaller as the degree of coupling of the distributed coupling increases. Adjustment of the resonance frequency is performed as shown in FIG.
This can be easily performed by trimming the open ends 622 and 623 in the case of (b) and the overlay metals 671 and 672 in the case of FIG.

As described above, according to this embodiment, a gap or an overlay is used between the open end of the resonator and the ground conductor.
Alternatively, by performing distribution coupling by a structure in which the layers are vertically overlapped via a dielectric, a small high-frequency resonator with easy frequency adjustment can be realized.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view of a high frequency filter according to a sixth embodiment of the present invention.

In FIG. 7, 71 is a dielectric substrate, 72 is a microstrip line resonator, 73 is a ground conductor, 74
Are ground conductors 7 formed on the front and back surfaces of the dielectric substrate 71.
3 and via holes 721 to 726 are resonators 7.
The open end 791, 792 is an input / output coupling circuit constituted by a capacitor.

The operation of the high-frequency filter configured as described above will be described below. FIG. 7 shows a configuration in which the three high-frequency resonators shown in the first embodiment are arranged side by side so that the lines at the open ends are adjacent to each other. In FIG. 7, the open ends 722 and 723 and 724 and 725 are adjacent to each other. Since this high-frequency resonator has a small size as described in the first embodiment, a filter formed using this resonator can be realized in a very small size. Input / output coupling circuit 7
Reference numerals 91 and 792 are constituted by capacitors connected to the lines at the open ends 721 and 726. The center frequency of the high frequency filter is adjusted by the open ends 722 and 72 of the resonator 72.
It can be easily done by trimming 3, 724 and 725.

As described above, according to the present embodiment, the microstrip line resonators 72 shown in the first embodiment are arranged side by side so that the lines at the open ends 722 and 723 and 724 and 725 are adjacent to each other. By doing so, a very small high-frequency filter can be realized.

In this embodiment, a three-stage high-frequency filter in which three microstrip line resonators 72 are arranged is shown. However, it goes without saying that a high-frequency filter can be realized regardless of the number of resonators. Further, in this embodiment, the embodiment in which the capacitance is connected to the open ends 721 and 726 as the input / output coupling circuit is shown. A coupling circuit can be configured, and a high-frequency filter having similar features can be realized.

(Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is a perspective view of a high frequency filter according to a seventh embodiment of the present invention.

In FIG. 8, 81 is a dielectric substrate, 82 is a microstrip line resonator, 83 is a ground conductor, 84
Are ground conductors 8 formed on the front and back surfaces of the dielectric substrate 81.
3, 821 to 826 are the resonators 8
Reference numeral 891, 892 denotes an input / output coupling circuit formed by taps.

The operation of the high-frequency filter configured as described above will be described below. FIG. 8 shows an arrangement in which the three high-frequency resonators shown in the second embodiment are arranged side by side so that the lines at the ground end are adjacent to each other. In FIG. 8, the ground ends 822 and 823, and 824 and 825 are adjacent to each other. Since this high-frequency resonator has a high no-load Q as described in the second embodiment, a small-sized and low-loss filter can be realized. The input / output coupling circuits 891 and 892 are connected to the ground terminal 8.
It is constituted by taps connected to the lines 21 and 826. The center frequency of the high frequency filter is adjusted by trimming the open end at the center of the resonator 82. The input / output coupling is adjusted by an input / output coupling circuit 891,
This can be easily performed by trimming the tap portion at the tip of 892.

As described above, according to the present embodiment, a small high-frequency filter with low loss is realized by arranging the resonators shown in the second embodiment such that the lines at the ground end are adjacent to each other. It is possible.

In this embodiment, the three-stage high-frequency filter in which three resonators are arranged is shown. However, it goes without saying that a high-frequency filter can be realized regardless of the number of resonators. In the present embodiment, the input / output coupling circuit 79
Although the embodiment in which a tap is provided at the ground end portion as 1 and 792 has been described, an input / output coupling circuit can be configured even when magnetic field coupling is performed with the ground end using an inductor or a parallel coupling line, and a high-frequency filter having similar characteristics is realized. It is possible.

Embodiment 8 Hereinafter, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a plan view of a high-frequency filter according to an eighth embodiment of the present invention as viewed from above. In FIG. 9, reference numerals 921 and 922 denote microstrip line resonators, and reference numerals 991 and 994 denote input / output coupling circuits composed of parallel coupling lines.

The operation of the high-frequency filter configured as described above will be described below. FIG. 9A shows an arrangement in which the high-frequency resonator shown in the first embodiment is arranged such that the branch portions of the line are adjacent to each other. FIG. 9B shows the high-frequency resonator shown in the second embodiment arranged such that the branch portions of the line are adjacent to each other.

With the configuration shown in FIG. 9, a two-stage filter which is very small in FIG. 9A and low in loss in FIG. 9B can be realized. The input / output coupling circuits 991 and 992 include a resonator 921
, And input / output coupling circuits 993 and 994 are parallel coupling lines magnetically coupled to the line at the ground end of the resonator 922. The center frequency of the high frequency filter can be easily adjusted by trimming the open ends of the resonators 921 and 922, and the input / output coupling can be easily adjusted by trimming the tips of the input / output coupling circuits 991 and 992.

As described above, according to the present embodiment, an ultra-small or low-loss high-frequency filter can be realized by arranging the branch lines of the resonator so as to be adjacent to each other.

In this embodiment, the input / output coupling circuit 99
Although an embodiment in which 1 and 992 and 993 and 994 are parallel coupled lines has been described, an input / output coupling circuit is constituted by a capacitor and a gap for an open end portion and an inductor and a tap for a ground end portion. However, a high-frequency filter having similar characteristics can be realized.

Embodiment 9 Hereinafter, a ninth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a plan view of a high-frequency filter according to a ninth embodiment of the present invention as viewed from above. In FIG. 10, reference numerals 1021 to 1023 denote microstrip line resonators, and reference numerals 1091 and 1092 denote input / output coupling circuits formed by gaps.

The operation of the high frequency filter configured as described above will be described below. FIG. 10 shows the lines at the open ends of the high-frequency resonators 1021 and 1023 shown in the first embodiment and the high-frequency resonators 10 shown in the second embodiment.
22 are arranged alternately so that the lines at the grounded end are adjacent to each other. Resonator 10 with branched open end
Resonators 1022 branching off the grounding end portion from the grounding portions 21 and 1023
Since each has a different spurious response, a high-frequency filter formed by alternately combining these has a wider stop band and a higher spurious suppression effect than a combination of the same resonator.

Further, since the degree of coupling between the open end portion and the ground end portion is relatively small, even if the resonators are arranged close to each other, the coupling between the stages is reduced and narrow band characteristics can be obtained. In addition, a narrow band filter which usually has a large shape can be realized in a small size. The input / output coupling circuits 1091 and 1092 are configured by providing a gap between the line at the open end and the tip of the input / output line. The center frequency of the high frequency filter can be easily adjusted by trimming the open ends of the resonators 1021 to 1023, and the input / output coupling can be easily adjusted by trimming the gap width.

As described above, according to the present embodiment, the resonator whose open end is branched and the resonator whose ground end is branched are so arranged that the open end line and the ground end line are adjacent to each other. By alternately arranging them, a small high-frequency filter having a high spurious suppression effect can be realized.

In this embodiment, an example is shown in which the input / output coupling circuit is connected to a resonator whose open end is branched, but a good spurious response can be obtained even if it is connected to a resonator whose ground end is branched. Needless to say, a small-sized high-frequency filter can be realized. Further, in the present embodiment, an example in which three resonators are arranged is shown, but it goes without saying that a high-frequency filter can be configured regardless of the number of resonators.

Embodiment 10 Hereinafter, a tenth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a plan view of a high-frequency filter according to a tenth embodiment of the present invention as viewed from above. In FIG. 11, 1121, 11
22 is a microstrip line resonator, 1191 and 12
Reference numeral 92 denotes an input / output coupling circuit connected to an external circuit.

The operation of the high-frequency filter configured as described above will be described below. FIG. 11 shows an arrangement in which the high-frequency resonator 1121 shown in the first embodiment and the branch portion of the high-frequency resonator 1122 shown in the second embodiment are arranged side by side. Resonators 1121 and 1122
Since these have different spurious responses, the high-frequency filter formed by combining these has a wider stop band and a higher spurious suppression effect than that obtained by combining the same resonator. The input / output coupling circuit 1191 is formed by gap coupling with the line at the open end of the resonator 1121, and the input / output coupling circuit 1192 is configured by tap coupling with the line at the ground end of the resonator 1122. By using both electric field coupling and magnetic field coupling for output coupling, it is possible to improve both the attenuation characteristics of the stop band on the low band side and the high band side of the pass band. The center frequency of the high frequency filter is adjusted by the microstrip line resonator 1
This can be easily performed by trimming the open ends of 121 and 1222. The adjustment of the input / output coupling can be easily performed by trimming and adjusting the tap and the gap.

As described above, according to the present embodiment, the spurious suppression is achieved by arranging the resonator branching from the open end portion and the resonator branching from the ground end portion so that the branch portions are adjacent to each other. A small high-frequency filter with high effect can be realized, and a high-frequency filter having good attenuation characteristics can be realized by using both electric field coupling and magnetic field coupling in the input / output coupling circuit.

In this embodiment, the two input / output coupling circuits are provided on the opposite sides of the resonator, respectively. However, it is needless to say that a high frequency filter can be realized even if they are provided on the same side.

[0069]

As described above, according to the present invention, the resonator having the conventional structure in which the open end portion is branched and bent so as to partially change the conventional line impedance to reduce the size is achieved. An even more compact high-frequency resonator can be realized. Further, by forming a structure in which the grounded end portion of the resonator is branched and bent, a small-sized high-frequency resonator having low loss can be realized. The high-frequency resonator of the present invention has a characteristic that is useful as a high-frequency device, such as having an effect of suppressing harmonics because the line impedance is not uniform, and easily adjusting the resonance frequency by trimming the open end. ing.

The high-frequency resonator of the present invention can be further miniaturized by adding a capacitance and a distributed coupling circuit to its open end. Adjustment of the resonance frequency in this case can be easily realized by trimming and overlaying the coupling line.

Further, by arranging the high-frequency resonator of the present invention such that the open end portion, the ground end portion, and the branch portion are adjacent to each other, it is possible to configure a high-frequency filter smaller than before. In this case, a filter having excellent harmonic suppression characteristics can be realized by alternately arranging different types of high-frequency resonators, and the attenuation characteristics can be realized by using both electric field coupling and magnetic field coupling in the input / output coupling circuit. Can be realized.

As described above, according to the present invention, a high-frequency resonator and a high-frequency filter having a small size and excellent characteristics can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a high-frequency resonator according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the relationship between a conventional high-frequency resonator and the high-frequency resonator according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a high-frequency resonator according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a configuration of a high-frequency resonator according to a third embodiment of the present invention.

FIG. 5 is a plan view showing a configuration of a high-frequency resonator according to a fourth embodiment of the present invention.

FIG. 6 is a plan view and a cross-sectional view illustrating a configuration of a high-frequency resonator according to a fifth embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of a high-frequency filter according to a sixth embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of a high-frequency filter according to a seventh embodiment of the present invention.

FIG. 9 is a plan view showing a configuration of a high-frequency filter according to an eighth embodiment of the present invention.

FIG. 10 is a plan view showing a configuration of a high-frequency filter according to a ninth embodiment of the present invention.

FIG. 11 is a plan view showing a configuration of a high-frequency filter according to a tenth embodiment of the present invention.

FIG. 12 is a perspective view showing a configuration of a conventional high-frequency resonator.

[Explanation of symbols]

1, 11, 31, 61, 71, 81 Dielectric substrate 2, 12, 22, 32, 42, 52, 62, 72, 8
2,921,922,1021,1023,1211,
1122 Microstrip line resonator 3, 13, 33, 43, 53, 63, 73, 83 Ground conductor 4, 14, 34, 74, 84 Via hole

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI H01P 5/08 H01P 5/08 H (56) References JP-A-4-68901 (JP, A) JP-A-3-162001 ( JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01P 1/20-1/219 H01P ^7/ 00-7/10

Claims (22)

(57) [Claims] 1. A grounding end in which one end of a single line composed of a strip or a microstrip line is grounded, and a tip of the single line which is not on the grounding end side is branched into a plurality of lines and bent and opened. Open end and
A high-frequency resonator having a ground capacitance added to an open end . 2. A single line composed of a strip or a microstrip line, a grounded end that is obtained by branching one end of the single line into a plurality of lines, bending the ground, and grounding;
A high-frequency resonator having an open end in which the other end of the single line other than the ground end is open. 3. The high-frequency resonator according to claim 2 , wherein a ground capacitance is added to the open end. 4. A high frequency resonator according to claim 1 or 3, wherein the ground capacitance was replaced by distributed coupling circuit and the ground conductor. 5. The ground conductor is formed on the same plane as the line.
It is, distributed coupling circuit and the ground conductor, said open on the same plane
5. The high-frequency resonator according to claim 4, wherein a side portion of the emission end is arranged close to the ground conductor. 6. A ground conductor is formed on the same plane as the line.
It is, distributed coupling circuit and the ground conductor, said open on the same plane
5. The high-frequency resonator according to claim 4, wherein the tip of the emission end is arranged close to the ground conductor. 7. A distributed coupling circuit with a ground conductor is used to open a line.
The end part and the ground conductor are vertically overlapped via the dielectric
5. The high-frequency resonator according to claim 4, comprising a coupling line. 8. distributed coupling circuit and the ground conductor, open line
5. The structure according to claim 4, wherein an overlay is provided so as to extend over the emission end portion and the upper part of the ground conductor.
A high-frequency resonator as described. 9. An open end of the high-frequency resonator, comprising: at least two high-frequency resonators according to claim 1; and an input / output coupling circuit that connects the high-frequency resonator to an external circuit. Branch at the open end
A high frequency filter , wherein each line is arranged adjacent to each other. 10. The method according to claim 2, wherein
At least two high-frequency resonators, and the high-frequency resonator and an external
An input / output coupling circuit for connecting the circuit;
Branch at the grounding end side of the vibration
Roads are arranged adjacent to each other.
High frequency filter. 11. A branch portion of a line of the high-frequency resonator, comprising: at least two high-frequency resonators according to claim 1; and an input / output coupling circuit that connects the high-frequency resonator to an external circuit. Are arranged adjacent to each other. 12. A first high frequency resonator constituted by branching a grounding end side of the high-frequency resonator according to any one of claims 2 to 8, the high-frequency resonance according to any one of claims 1 or 4 to 8 A second high-frequency resonator formed by branching an open end side of the device, and an input / output coupling circuit for connecting the first and second high-frequency resonators to an external circuit, wherein the first high-frequency resonator is provided. Wherein the line at the ground end and the line at the open end of the second high-frequency resonator are alternately arranged so as to be adjacent to each other. 13. A high-frequency resonator according to claim 2 , wherein the open-ended side of the high-frequency resonator according to claim 1 or 4 is branched.
A second high-frequency resonator formed by branching a ground end side of the resonator; and an input / output coupling circuit for connecting the first and second high-frequency resonators to an external circuit. A high-frequency filter, wherein the branch portions of the lines of the high-frequency resonator are arranged adjacent to each other. 14. The high frequency filter according to claim 9 , wherein the input / output coupling circuit is a capacitor connected to a line at an open end of the high frequency resonator. 15. The high frequency filter according to claim 9 , wherein the input / output coupling circuit is an inductor connected to a line at a ground end of the high frequency resonator. 16. The high-frequency filter according to claim 9 , wherein the input / output coupling circuit is a distributed constant circuit that is electrically coupled to a line at an open end of the high-frequency resonator. 17. The high-frequency filter according to claim 9 , wherein the input / output coupling circuit is a distributed constant circuit that magnetically couples with a line at a ground end of the high-frequency resonator. 18. An input / output coupling circuit, wherein one of an input side and an output side is a distributed constant circuit for electric field coupling with an open end line or a capacitance connected to an open end line, and the other is a ground end line. 14. A high-frequency filter according to claim 9 , wherein the high-frequency filter is a distributed constant circuit that is magnetically coupled to the high-frequency filter or an inductor that is connected to a line at a ground end. 19. A distributed constant circuit for electric field coupling with an open end is provided by providing an input / output line connected to an external circuit and providing a gap between the tip of the input / output line and the line at the open end. 2. The method according to claim 1, wherein
19. The high frequency filter according to 6 or 18 . 20. A distributed constant circuit for electric field coupling with an open end is provided by providing an input / output line connected to an external circuit, and connecting the open end portion line and the input / output line in parallel. 19. The high frequency filter according to claim 16, wherein: 21. A distributed constant circuit which is magnetically coupled to a ground terminal is provided by providing an input / output line connected to an external circuit, and connecting the input / output line to a line at the ground terminal portion using a tip of the input / output line as a tap. 18. The method of claim 17, wherein
Or the high-frequency filter according to 18 . 22. A distributed constant circuit magnetically coupled to a ground terminal, comprising: an input / output line connected to an external circuit; and the input / output line being grounded near the ground terminal. The high-frequency filter according to claim 17 or 18, wherein: