JPH0536901U - Stripline resonator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stripline resonator that is miniaturized in its entirety and equipped with electronic components. [Structure] A plurality of resonance electrodes 2a, 2 on one main surface of a substrate 1
b and 2c are provided, and the recess 5a,
5b is formed, and the coils (electronic parts) L1 and L2 are formed in the recess 5
Provided in a and 5b. [Effect] By using the electronic component as the lumped constant circuit component, for example, the λ / 4 transmission line is not required, and the electronic component can be accommodated within the thickness dimension of the dielectric substrate, so that the overall size is reduced. Further, by using the electronic component, it is possible to obtain a stripline resonator having characteristics that cannot be obtained only by the resonance electrode provided on the dielectric substrate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stripline resonator formed by forming a resonance electrode on a dielectric substrate.

[0002]

[Prior Art]

 Strip line resonators have been conventionally used as, for example, band pass filters and band stop filters in the microwave band.

FIG. 7 shows a configuration example of a microstrip line type band elimination filter using a single dielectric substrate. In FIG. 7, reference numeral 1 is a dielectric substrate, and three resonance electrodes 2a, 2b, 2c and transmission lines 3a, 3b are formed on a first main surface (surface in the figure) of the dielectric substrate. As shown in the figure, the transmission lines 3a and 3b are capacitively coupled with the open ends of the three resonance electrodes 2a, 2b and 2c. A substantially whole surface ground electrode is formed on the second main surface (back surface in the figure) of the dielectric substrate 1, and the short-circuited ends of the three resonance electrodes 2a, 2b, 2c are connected to the ground electrode via the end surface of the substrate. It is connected.

An equivalent circuit diagram of the filter shown in FIG. 7 is shown in FIG. In FIG. 8, R1, R2 and R3 are λ / 4 resonators by the resonance electrodes 2a, 2b and 2c shown in FIG. 7, and C1, C2 and C3 are couplings between the resonators R1, R2 and R3 and the transmission lines 3a and 3b. Capacity. In this way, it acts as a three-stage band elimination filter.

[0005]

[Problems to be solved by the device]

 In a conventional stripline resonator in which multiple resonance electrodes are provided on the same dielectric substrate and adjacent resonance electrodes are connected via a transmission line, the transmission line connecting adjacent resonators is , A length of at least λ / 4 is required.

Therefore, when a large number of resonance electrodes are provided, there is a problem that the size is increased as a whole. Moreover, only the resonance electrode and other electrodes such as a transmission line that is capacitively coupled to the resonance electrode are formed on the dielectric substrate, and electronic components or active elements as a lumped constant circuit cannot be provided. It was

An object of the present invention is to solve the above-mentioned various problems and provide a stripline resonator having a small size and excellent characteristics.

[0008]

[Means for Solving the Problems]

 A stripline resonator according to claim 1 of the present invention is a stripline resonator in which a plurality of resonant electrodes are formed on one main surface of a dielectric substrate, wherein a recess is formed in a part of a dielectric substrate. At the same time, an electronic component is provided in the recess.

A stripline resonator according to a second aspect is a stripline resonator in which a resonance electrode is provided on a bonding surface of two dielectric substrates, and at least one dielectric substrate has the other dielectric substrate. It is characterized in that a recess is formed in a part of the joint surface with respect to the body substrate and an electronic component is provided in the recess.

[0010]

[Action]

 In the stripline resonator according to the first aspect, the recess is formed in a part of the dielectric substrate, and the electronic component is provided in the recess. Therefore, for example, the distance between the resonance electrodes can be shortened by replacing the conventional λ / 4 transmission line with an electronic component as a lumped constant circuit and providing it in the recess. Further, since the electronic component is provided in the recess, it is possible to eliminate the protrusion of the electronic component from the dielectric substrate or to reduce the protrusion amount.

In the stripline resonator according to claim 2, a resonance electrode is formed on the joint surface of two dielectric substrates, and the joint surface of at least one dielectric substrate to the other dielectric substrate is formed. A concave portion is formed in a part of the above, and an electronic component is further provided in the concave portion. Although it is a so-called tri-plate type resonator in which two dielectric substrates are bonded together in this way, electronic components can be incorporated inside the substrate, and the overall size can be easily reduced. The characteristics can also be improved.

[0012]

【Example】

 The structure of the band elimination filter according to the first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing a structure of a filter, (A) is a front side perspective view, and (B) is a back side perspective view. In FIG. 1, reference numeral 1 is a dielectric substrate, and three resonance electrodes 2a, 2b, 2c and three capacitor electrodes 4a, 4b, 4c are formed on the first main surface (front surface) thereof. Further, on the first main surface side of the dielectric substrate 1, a recess 5a is formed between the capacitor electrodes 4a-4b and a recess 5b is formed between the capacitor electrodes 4b-4c. Then, as shown in the figure, the coil L1 is arranged in the recess 5a, both ends thereof are connected to the capacitor electrodes 4a, 4b, the coil L2 is arranged in the recess 5b, and both ends thereof are formed by the capacitor electrodes 4b, 4b. 4c is connected. As shown in FIG. 1 (B), a substantially entire surface ground electrode 6 is provided on the back surface of the dielectric substrate 1. The short-circuited ends of the three resonance electrodes 2a, 2b, 2c are connected to the ground electrode 6 on the back surface via the end surface of the dielectric substrate 1. Further, signal input / output terminals 7a and 7c are formed on the second main surface side through the other end surface of the dielectric substrate 1.

FIG. 2 is a vertical cross-sectional view of the recess 5a portion shown in FIG. By thus providing the coil L1 in the recess 5a, the thickness of the filter can be made substantially equal to the thickness dimension of the dielectric substrate 1.

FIG. 3 is an equivalent circuit diagram of the filter shown in FIGS. 1 and 2. In FIG. 3, R 1, R 2 and R 3 are resonators by the resonance electrodes 2 a, 2 b and 2 c shown in FIG. 1, Ca, Cb and Cc are the capacitor electrodes 4 a, 4 b and 4 c shown in FIG. 1 and the second main surface side. Is a capacitance formed between the ground electrodes 6 on substantially the entire surface. C1, C2 and C3 are capacitors formed between the open ends of the resonance electrodes 2a, 2b and 2c shown in FIG. 1 and the capacitor electrodes 4a, 4b and 4c. The Ca-L1-Cb π-type LC circuit and the Cb-L2-Cc π-type LC circuit in FIG. 3 are each equivalent to a λ / 4 transmission line, and a filter equivalent to the filter shown in FIG. Can be configured in a small size. Moreover, unlike the case of the filter in which the transmission line is provided on the dielectric substrate, the filter characteristic can be adjusted by adjusting the inductance of the coils L1 and L2.

Next, the configuration of the band elimination filter according to the second embodiment will be described with reference to FIGS. 4 and 5.

FIG. 4 is an exploded perspective view of the filter. In FIG. 4, 11a and 11b are dielectric substrates, respectively. The structure of the dielectric substrate 11a is substantially the same as that shown in FIG. 1 as the first embodiment, and the resonance electrodes 2a, 2b, 2c, the capacitor electrodes 4a, 4b, 4c and the recess 5a are formed on the first main surface. 5b is provided, and the coils L1 and L2 are connected between the capacitor electrodes, respectively. The same electrode pattern and recesses as those on the first main surface side of the dielectric substrate 11a are formed on the first main surface (back surface side in the figure) of the dielectric substrate 11b. Ground electrodes 6a and 6b are formed on the second main surface and the end surfaces of the dielectric substrates 11a and 11b on substantially the entire surface except the signal input / output terminals and the lead-out portions thereof. By joining the two dielectric substrates shown in FIG. 4, a three-stage band elimination filter using a triplate-type stripline resonator can be constructed.

FIG. 5 is a vertical cross-sectional view of a recess forming portion of the filter shown in FIG. In FIG. 5, 5a is a recess provided on the side of the dielectric substrate 11a, and 5a 'is a recess provided on the side of the dielectric substrate 11b. The coil L 1 is arranged in the space formed by the facing of the recesses. . In this way, a triplate band stop filter can be constructed by using two dielectric substrates, and two coils L1 and L2 as lumped constant circuit components can be provided in the two dielectric substrates. .

Next, a cross-sectional view of the filter according to the third embodiment is shown in FIG. The difference from the filter shown in FIG. 5 as the second embodiment is that one end of the space formed by the facing of the recesses provided in the two dielectric substrates is opened to one end face of the dielectric substrate. It is that. According to this structure, the inductance of the coil L arranged in the space can be adjusted through the opening H, and the filter characteristics can be easily adjusted.

In each of the above-described embodiments, the band elimination filter is taken as an example, but the band pass filter can be similarly configured.

[0021]

[Effect of the device]

 According to the present invention, electronic components can be easily mounted on a dielectric substrate on which a plurality of resonance electrodes are formed, so that a stripline resonator having characteristics that cannot be obtained only by an electrode pattern on the dielectric substrate is obtained. You can In addition, since the electronic component is arranged in the concave portion provided on the dielectric substrate, it is possible to obtain a small stripline resonator as a whole.

[Brief description of drawings]

FIG. 1 is a perspective view of a filter according to a first embodiment,
(A) is a perspective view seen from the first main surface side, and (B) is a perspective view seen from the second main surface side.

FIG. 2 is a vertical cross-sectional view of the filter according to the first embodiment.

FIG. 3 is an equivalent circuit diagram of the filter according to the first embodiment.

FIG. 4 is an exploded perspective view of a filter according to a second embodiment.

FIG. 5 is a vertical sectional view of a filter according to a second embodiment.

FIG. 6 is a sectional view of a filter according to a third embodiment.

FIG. 7 is a perspective view of a conventional filter.

FIG. 8 is an equivalent circuit diagram of a general filter.

[Explanation of symbols]

 1, 11a, 11b-Dielectric substrate 2a, 2b, 2c-Resonance electrode 3a, 3b-Transmission line 4a, 4b, 4c-Capacitor electrode 5a, 5b-Coil 6,6a, 6b-Ground electrode 7a, 7c-Signal input Output terminals L1, L2-Coil

Claims (2)

[Scope of utility model registration request] 1. A stripline resonator comprising a plurality of resonant electrodes formed on one main surface of a dielectric substrate, wherein a recess is formed in a part of the dielectric substrate and an electronic component is provided in the recess. A stripline resonator characterized in that 2. A stripline resonator comprising a resonant electrode provided on the joint surface of two dielectric substrates, wherein a recess is formed on at least one of the joint surfaces of the dielectric substrate and the other dielectric substrate. In addition, the stripline resonator is characterized in that an electronic component is provided in the recess.