JPS60190002A - Strip line resonator - Google Patents

Abstract

PURPOSE:To attain ease of manufacture and also to improve the electric performance through the weakened coupling between open ends by providing a conductor film to upper and lower faces of a dielectric substrate and also providing a slit to a dielectric in the lengthwise direction from one end face of the substrate so as to split the conductor film and the dielectric into two in a U- form. CONSTITUTION:The slit 24 is provided in a U-shape in the lengthwise direction from one end face of the dielectric substrate 21 so as to form the conductor pattern on two faces having a slit, one is used as a ground conductor and the other is used for a center conductor of a microstrip resonator. Since the metallic conductor is manufactured easily by means of the method such as printing or sputtering without using any mask, it is possible to reduce remarkably the cost. Since air gap exists between the two open ends in the resonator in Fig., the coupling between the open ends in decreased remarkably, the dielectric loss is reduced and the Q at no load is improved. Furthermore, the tuning range of the frequency is increased as much as one octave by changing the length of the slit.

Description

[Detailed description of the invention] Industrial applications The present invention is a filter for VHF-5HF band.

This invention relates to a strip line resonator using a dielectric material used as a resonant element in an oscillator or the like.

Conventional Structure and Problems The strip line resonator of 11 has a simple structure and is extremely easy to use as a film, so it is frequently used as a resonant element in VHF-3HF filters and oscillators. In order to reduce the m-loss of this resonator, a non-adjustable resonator is used, and a U-shaped resonator folded into a hairpin shape is often used to achieve miniaturization.

FIG. 1 shows a conventional U-shaped storage line 1/1 wavelength resonator with both ends open.

In FIG. 1, reference numeral 11 denotes a dielectric substrate, on one side of which is provided a grounded beech body 13, and on the other side are provided with a strinograph L and a 'f body 12. Although this example uses an unbalanced ΔP microstrip line, there is also a balanced type (II) configuration using a dielectric substrate on the + side of the strut 9119629 body. Such a resonator has a high no-load Q and good reproducibility of characteristics such as resonance frequency. There are manufacturing problems such as difficulty in accurately positioning the board, and furthermore, since the phases of the two open ends are 180° different, a large coupling occurs at both ends, increasing the loss of power. It also has problems in terms of electrical performance, such as causing stray coupling.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention simplifies the manufacture of a U-shaped strip or 1-micro strip line resonator with open ends, reduces costs, and makes it easier to manufacture a U-shaped strip line resonator with open ends*.
The purpose of the present invention is to provide a strip line resonator 43H which is capable of improving electrical performance by removing the coupling between 1.

Structure of the Invention The present invention has a film dedicated to the subsurface of the dielectric substrate, and also has a structure in which the substrate is divided into two parts. A slit is provided in the dielectric body in a U-shape in the direction k from one end surface, and the #'
By using one surface with a pattern as a ground conductor and the other surfaces with an I-body film as strip conductors, the two objectives are achieved.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a strip line resonator according to an embodiment of the present invention. ! It shows an r cross section. In Figure 2,
A slit (groove) 24 is provided from one end surface of the dielectric substrate 21 in the J+ direction of the substrate to form a U-shape, and a conductive pattern is created between the two slits and one is grounded W.
and the center conductor of all other micro-strip resonators. This slit: After setting the body, the slit l-
(@te may be provided. Even in the case of At, metals I
Since it can be easily produced using techniques such as single-layer printing or sputtering without using a mask, IJJ can significantly reduce costs.

Figure 3 shows an example of a half-f, r-type strip resonator.
A U-shaped dielectric body 31, 32 similar to that shown in FIG. This type of structure allows the formation of a metal conductor to be realized much more easily than in the past.

In addition, in the resonators shown in Figures 2 and 3, since there is a gap between the two open ends, the coupling between the open ends can be significantly reduced, and it also contributes to reducing dielectric loss [,2 No-load Q The direction is 1. , Furthermore, regarding the unloaded dlr Q, the line +lj is wide at the part where the current is maximum, the conductor resistance is not small, and the structure is capable of reducing the body loss. You can improve.

Furthermore, by changing the length of the slit (full),
In the resonator shown in FIGS. 2 to 3, the wave number tuning range can be approximately one octave, and the impedance of the slit (groove) line is 22, &! The electrical length of the line is 02, the impedance of the line without slits (grooves) is 21, and the electrical length of the line is 20.
．． Then, the resonator can be made isometrically with three (/- lines 41, 42, 43) as shown in Fig. 4.The resonance conditions at this time are tan θ, , tan θ2-Z2/ Z.

The total length of the resonator is 4°, and the length of the slit is l. closing, the number I in the phase of the line, the resonance t
If the wave JQ in rot ii* number is λg, θ1
=/j(eo-e)/2-π(eo-4)/λ.

02−βeo=2πeo/λ.

becomes. Now let the length of the slit (t((i; ) be O and 1
'', this resonator becomes a uniform line resonator, the resonance +i', j wave number at this time is 210, and a slit (1 it
J) As the length e increases, the resonance frequency increases to 1□□□2 as shown in Figure 6, and as eovC approaches, it approaches 2f o/”-no〇. 1. This is because as the line length becomes almost twice as long, the resonant frequency also becomes equal to the current.In this way, both J++ < the whole of the device: /!
Even if the distance is constant, a slit (and) hill must be provided &'1=
91: Jo-zfo=z, huh? The resonant frequency across the 1 octave can be changed to J. By changing the length of the /kome slit (?i"11) to W11, 1.
°･'' Wave number can be finely adjusted.

It should be noted that when a slit (groove) exists, the resonator becomes a composite line resonator as shown in Fig. 4, and as is well known, its Sgelius circumference? The skin number deviates from an integral multiple of the fundamental wave. This means that when a signal containing harmonic components is passed through a filter using this resonator, it is possible to achieve a characteristic in which only the fundamental wave propagates and does not pass harmonics, which are integral multiples of the fundamental wave. means. This is a feature not found in ordinary uniform line resonators, and is extremely useful as an output filter that receives a large amount of equal harmonics IyM of the booster IIJ.

Effects of the Invention As mentioned above, the present invention is simple and easy to manufacture, making it a low-cost resonator.
Cow attack by tying to publish a slit in the open end 1
+M+Q resonance 2:n can be achieved by reducing the deterioration of '1/
・-To change the length of the slit,-
11 is IJJ over one octave in the resonator of Jθ,
It is possible to realize a variable ΦlL circumference, and furthermore, the slit length can be adjusted to the key I! By doing so, the frequency value becomes i14, and the spurious resonance frequency does not deviate from 74 times the fundamental wave. This strip line resonator is extremely useful as a resonant element for filters and oscillators, especially in the VHF-UHF band, and its industrial 111
I1111'I is large.

[Brief explanation of drawings]

Figures 1a and b are sectional views of a conventional strip line open-ended residual wavelength resonator, respectively; Figure 2 a and bii are sectional views of a strip line and J-type resonator according to an embodiment of the present invention; and Figure 3 a. , bid each other length/liu of the present invention
Cross-sectional view of strip line J (wavelength 2: ;
Figure 4 shows the γI of the strip line resonator in Figures 2 and 3.
Value 1! -! The circuit diagram and FIG. 6 are characteristic diagrams showing changes in resonance frequency when the length of the slit is changed. 21.31.32...Electricity visiting body board, 22.33
・・・S]・S、P conductor, 23, 34, 36...
・Ja ground body, 24, 36-=...slit. Representative's name: Patent attorney Toshi Nakao (Male)
Figure 2 (0-t (b+

Claims (4)

[Claims] (1) A conductor film is provided in the vertical direction of the visitor board, and a slit is formed in the dielectric member (l) in the length direction from one end surface of the board so as to divide the conductor film and the dielectric member into two. 1. A strip line resonator, characterized in that the strip line resonator is provided in the shape of a letter, and one surface of the conductor film is used as a ground conductor, and the other surface of the conductor film is used exclusively as a strip. (2) After making a slit in the dielectric and forming it into a U-shape,
(a) IJ tube line resonator according to claim 1, characterized in that the conductor 11K is formed on two surfaces with slits. (3) 1. A balanced type in which U-shaped dielectrics of the same shape with a conductor film on the bottom surface are stacked in the same direction and crimped or fused together, with the outer two six-body surfaces serving as the ground plane and the middle conductor serving as the center conductor. A stripline resonator according to claim 1. (4) The strip line resonator according to claim 1fj4, wherein the frequency is adjusted by changing the length of the slit.