JPS58223902A - Strip resonator - Google Patents

Abstract

PURPOSE:To make the manufacture easy and to make the frequency adjustable after manufacture, by eliminating a part of a ground conductor layer near a resonance strip conductor and decreasing the effective dielectric constant of a base for increasing a conductor pattern size. CONSTITUTION:The ground conductor layer 12 is formed on one side of the insulating base 12, the square resonance strip conductor 13 is formed on the other side of the base 11, and the strip line is constituted with the ground conductor layer 12 and the strip conductor 13. Further, the ground conductor layer 12 near the strip conductor 13 is removed to form a removing section 18. An electromagnetic field inputted from a signal input/output conductor 15 is leaked from the removing section 18, the effective dielectric constant of the base 11 is decreased and the resonance frequency is increased, then the electromagnetic field having a high frequency is propagated from the strip conductor 13 to an input/ output conductor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strip resonator mainly used for microwaves and made of a strip line.

<Prior art> For example, as shown in FIG. 1, this conventional resonator has a ground conductor/112 formed on one side of an insulating substrate 11, and a rectangular resonant strip conductor 13 on the other side of the insulating substrate 11. A strip line is formed by the ground conductor (12) and the strip conductor 13, which resonates at the frequency of 1r&constant. S) Signal output conductors 14 and 15 are formed close to both ends of the IJ tag body 13, respectively. Some have conductors 16 formed thereon. Furthermore, as shown in FIG. 3, a disc-shaped strip conductor 17 is also known in place of the rectangular strip conductor 13.

In these conventional strip resonators, when the applicable frequency range is high or when the relative dielectric constant of the insulating substrate 11 is high, (1) the strip conductor A of the resonator? The turn dimensions become smaller, making manufacturing difficult. ■ Due to slight manufacturing errors in the pattern dimensions, the resonant frequency deviates significantly from the design value. ■ Filters are constructed by combining multiple rectangular microstrips and strips. However, there were drawbacks such as the small gap between the microstrip lines, which made manufacturing difficult, and (2) the inability to adjust the frequency after manufacturing.

<Summary of the Invention> An object of the present invention is to make it possible to make the dimensions of the string conductor i4 turns relatively large, so that the resonant frequency does not deviate greatly from the design value even due to slight manufacturing errors in the dimensions.
Another object of the present invention is to provide a strip resonator whose resonant frequency can be adjusted after manufacturing.

According to this invention, a portion of the ground conductor layer near the resonant strip conductor of the strip resonator is removed. With this configuration, electricity is removed from the removed portion of the ground conductor layer.
The magnetic field leaks to the outside, and as a result, the effective lightning arresting factor of the insulating substrate decreases. Therefore, the resonant frequency is higher using a resonant strip conductor of the same size than when the ground conductor layer is not removed.

First Embodiment] FIGS. 4 and 5 show an example of a strip resonator according to the present invention, and parts corresponding to those in FIGS. 1 to 3 are given the same reference numerals. This example is a case where a rectangular strip conductor 13 is used as the vibration strip conductor,
In the present invention, the ground conductor layer 12 near the resonant strip conductor 13 is removed to form a removed portion 18. The removed portion 18 in this example has a rectangular shape, and is rectangular when viewed from a direction perpendicular to the surface of the insulator substrate 110.
3 and the longitudinal center line of the rectangular removal part 18 are aligned. (for resonance) IJ conductor 13
This is a case where the length Xl of the removed portion 18 is made slightly shorter than the length XR, and the width WL of the removed portion 18 is made slightly longer than the width WR of the strip conductor 130. (for resonance) IJ, f
The distances between the conductor 13 and the input/output conductors 14, 151'H1 are both G. Input/output conductor 14.15 and ground conductor layer 1
2 and 2 constitute microstrip lines, respectively.

Input from the signal input/output conductor 15 and towards the signal input/output conductor 14! Consider the case where the magnetic field advances. The electromagnetic field in this case propagates along the line of the resonant strip f conductor 13. If there is no removal s18, that is, if the width WL of the removed portion 18 is zero in FIG.
However, when WL-(O is established, the electromagnetic field leaks from the ground conductor layer 12 through the removal part 18 as shown by the arrow in FIG. 5 when the pick removal part 18 is provided. Therefore, the effective permittivity of the dielectric substrate 11 decreases, and the resonant frequency increases.
The signal is transmitted from the input/output conductor 14 to the strip line.

In the specific example of the actual Is example shown in FIGS. 4 and 5, the insulator substrate 11 has a relative frost and a rate of 9.6. Thickness 0.3 dark alumina ceramic; board, ground conductor layer 12 thickness 3
It was plated with μm gold. The input/output conductors 14 and 15 have a line width of 0.3 mm (50 Ω thread), and the width WR of the strip conductor 13 is constant at 0.3 rm, and the line length XR and , m- of the removing section 18.

I changed my long XL and it made me vomit. Note that the gap Gl between the input/output conductor 14.15 and the resonance strip f conductor 13 is 251 tm.
And so. The results of 6111 pairs of resonance characteristics in this case are shown in FIG. However, X, = XRo, 1 mm becomes 1
maintained the relationship. From FIG. 286, the solid line 19 represents the case where W,=0 and the removing portion 18 does not exist, as shown in FIG.

=0.3■, WL=0.6+m++.

In either case, the length of the IJ tube conductor 13 (for resonance)
As the time increases, the resonant frequency decreases. In the case of the same resonant frequency, if the width WL of the removal part 18 is increased, the strike 1
) The conductor length XR becomes longer. By providing the removed portion 18 in this way, four dimensions can be made larger even with the same resonant frequency.

Second Embodiment> FIGS. 7 and 8 show other embodiments of the present invention, in which the invention is applied to a coupled strip resonator, in which two rectangular strike 1 nog conductors 22 are used as resonance strip conductors. .23
are provided in close parallel to each other, these IJ tube conductors 2
Input/output conductors 14 and 157 are respectively connected to one end of 2.23 and the other end of 23. A rectangular removed portion 18 is provided in common to the strip conductors 22 and 23.

For example, the valley width Wn of the strip conductor 22.23 is 0.3 m.
are constant, and each length Xl and the length W of the removing section 18 are constant.
L and length X were changed. In addition, the input/output conductor 14
．． 15 strip conductors 22 and 23 each gap G1
was set to 25 μm, and the strip conductor 22.23 of Nanano 9 Lasin SR was set to 60 μm. In the coupled strip resonator, the electric field is connected to the ground conductor Jt412 and the resonant conductor 22.2.
@Vt3n (even) mode that occurs between 3 and
Odd where the electric field mainly occurs between the resonance conductors 22 and 23
(odo) mode occurs at the same time.

The measurement results of the resonance characteristics in the specific example are shown in FIGS. 9 and 10, respectively. Figure 9 shows the even mode, the first
Figure 0 is for odd mode.

In these figures, XL=XR-0,lran, solid line 24, 27iWL=0, broken line 25.28
is w, = 0, 3 songs, 1 point 6IA, cat 26.29 is WL =
This is the case of 0.6 solution. In the case of the even mode, leakage of the electromagnetic field from the removal section 18 has a greater effect than on the odd mode, and at the same resonance frequency, the larger the width WL of the removal section 180, the longer the length XR of the resonance strip conductor 64
<vr, 3 yi example> Fig. 11 and Fig. 1
In the embodiment shown in FIGS. 7 and 8, FIG. 2 shows a rectangular removed portion 30.31 having the same width WR as the conductor 22.23, respectively, for the resonance conductor 22.23.
This is the case when they are placed facing each other. Resonant strip conductor 2
Width WR of 2.23 is 0.3 wn T separation wr
/Sn is constant at 60 Jim, strip conductor 2
The length XR of 2.23 was varied. The width WL of the removal section 30.31 is 0.3 wa + the serage w 7 SL of the removal section 30.31 is constant at 60 ttm, and the removal section 30
．． The length XL of 31 was changed by keeping xR-o and i short. In addition, the input/output conductor 14゜15 and the strip conductor 14
．． Each gap G1 with respect to No. 15 was set to 25 μm. Figures 13 and 14 show the measurement results of resonance characteristics in this case.
V@n mode and odd mode are shown. Solid line 32.
34 is WL=0. The broken line 33.35 is WL=0.3 key. Similar relationships were obtained between the torsion and FIGS. 9 and 10.

In addition, in the embodiments shown in FIGS. 4, 5, 7, 8, 11, and 12, the centers of the resonant strip conductor and the removed portion are aligned, but this is It is okay to deviate, and the lengths XR and XL are Xi; == X
n O, 1mg and this 4 XL) XR-0,
It is good to set it as 1+m.

In the embodiments shown in FIGS. 11 and 12, the width WR1WL is set to WR=WL, but it may be different.

<Fourth Embodiment> FIGS. 15 and 16 show an embodiment in which the present invention is applied to an IJ resonator using the ring-shaped resonant strip conductor 16 shown in FIG. 2. Ring-shaped resonance strike+
Juzzo conductor 16 and ring-shaped removed portion 36 facing each other with insulator substrate 11 in between are formed concentrically on ground conductor layer 12 . The width of the ring-shaped strip conductor 16 is WRl
The width of the ring-shaped removed portion 36 is WLl. The average radius of each of the ring-shaped strip conductor 16 and the ring-shaped removed portion 36 is rM.
shall be.

For example, the insulator substrate 11 has a dielectric constant of 96° and a thickness of 0.
．． A 3-tone alumina ceramic substrate was used, and the ground conductor was plated with gold to a thickness of 3 μm. The input/output conductors 14 and 15 had a line width of 0.3 mm (50Ω system), and the average radius rM of the ring-shaped strip conductor 16 and the removal portion 36 was 9 mm. Also, the width of the ring-shaped conductor 16 is VVR.
The width WL of the ring-shaped removed portion 360 was changed while keeping FiO-3wm constant. Note that the gap Gtrj between the input/output conductor 14.15 and the ring-shaped strip conductor 14.15
:25 μm, and the measurement results of the resonance characteristics in this numerical example are shown in FIG. Curves 37 and 38 are used when the resonance order n in the circumferential direction of the ring is 1 and 2, respectively. As the width WL of the removing portion 36 increases, the resonance frequency increases. In other words, even if the size of the ring-shaped strip conductor 16 is the same, the resonant frequency can be lowered by providing the ring-shaped removed portion 36.

<Fifth Embodiment> FIGS. 18 and 19 show an example in which the present invention is applied to a strip resonator using the disc-shaped resonant strip conductor 17 shown in FIG. 3. A ring-shaped removed portion 36 is formed concentrically on the ground conductor layer 12, facing the peripheral edge of the IJ conductor 17 with the insulator substrate 11 interposed therebetween.

In the above description, the resonance conductor and the removed portion are rectangular or ring-shaped, but they may also be elliptical, polygonal, or the like. Also, Fig. 15, Fig. 16 and Fig. 18, ff1
1913'! The inner diameter of the ring-shaped removal part 36 may be set to zero at l, or the removal part 18.30°31.36F
i, each operates as a slot resonator, and since the removal parts 30 and 31 operate as IJ tag oscillators, by utilizing the slot mode excited in these slot resonators, the strip resonator It is also possible to construct a filter in which the resonance frequencies of the slot resonator and the slot resonator are made close to each other, and the passband is set between the respective center frequencies.

Effect> As explained above, this invention provides a removed portion with a finite area on the ground conductor layer facing one or more strip conductors with a finite area via an insulating substrate, so that the removed portion is The effective dielectric constant of the insulating substrate can be adjusted depending on the size. Therefore, even when the applicable frequency of the resonator is high or the dielectric constant of the insulating substrate is high, the main turn dimensions of the resonator can be made relatively large, making manufacturing easier. The influence of manufacturing errors in the turn dimensions on the resonant frequency is reduced. ■Resonance f: By trimming after f manufacturing, the dimensions of the removed part are changed, and the resonant frequency is reduced to 1.
■ By changing the dimensions of the removal part, the resonance frequencies of the evsn mode and odd mode excited between multiple resonant strip conductors can be adjusted.
A filter can be constructed by bringing these resonant frequencies close together.
(2) There is an advantage that a filter can be constructed by utilizing a slot mode excited between one or more removal sections.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a strip resonator using a conventional rectangular resonant (IJ) conductor, and Fig. 2 is a perspective view showing a strip resonator using a conventional ring-shaped resonant strip conductor. Figure 4 is a perspective view showing a strip resonator using a conventional circular resonance strip conductor, and Figure 4 shows an embodiment in which the present invention is applied to a strip resonator using a rectangular resonance strip conductor. Floor plan, 5th
The figure shows a cross-sectional view taken along line X-x' in Fig. 4, Fig. 6 shows a resonance characteristic curve of the first embodiment, and Fig. 7 shows a second embodiment in which the present invention is applied to a coupled strip resonator. The plan view, FIG. 8 is a sectional view taken along YY' Aoi in FIG. 7, and FIGS. 9 and 10 show the measurement results of the resonance characteristics of @V@n mode and odd mode of the second embodiment, respectively. Fig. 11 is a plan view showing a third embodiment in which the present invention is applied to a coupled strip resonator, Fig. 12 is a sectional view taken along the line Y-Y' in Fig. 11,
FIG. 13 and FIG. 14 are the even diagrams of the third embodiment, respectively.
Figure 15 is a diagram showing the measurement results of the resonance characteristics of mode and female dd mode. Fig. 16 is a cross-sectional view taken along the x-x' line in Fig. 15, and Fig. 17 is a resonance characteristic curve diagram of the fourth embodiment.
FIG. 8 is a plan view showing a fifth embodiment in which the present invention is applied to a strip resonator using a disc-shaped resonant strip conductor;
FIG. 19 is a sectional view taken along line x-x' in FIG. 18. 11: Insulator substrate, 12: Ground conductor layer, 13°22,
23: For square resonance) IJ tube conductor, 14°15:
Input/output conductor, 16: ring-shaped co-search strip conductor,
17 Two disc-shaped resonant strip conductors, 18.30, 31
: Square removed part, 36: Ring-shaped removed part. Special fraud applicant Takashi Kusano Agent of Nippon Telegraph and Telephone Public Corporation Figure 2 Figure 4 Figure 5 Zutrip copper prolongation
M ■ Fig. 12 St 9 tube conductor &XR<m) Fig. 15 Fig. 16

Claims (1)

[Claims] (1) In a strip resonator in which a ground conductor layer is formed on one surface of the insulating substrate and at least one resonant conductor of a finite area is formed on the other surface of the insulating substrate, the resonant A strip resonator characterized in that a portion of the ground conductor layer near the IJ conductor is removed.