JPH0758521A - Strip line resonator - Google Patents

Abstract

PURPOSE:To provide an inexpensive strip line resonator with an excellent electric characteristic by saving a mount space of the strip line resonator on a mount base. CONSTITUTION:One set of strip line resonance electrodes 6a, 6b, 6c, 6d, 7 and other one-set of strip line resonance electrodes 7, 8d, 8c, 8b, 8a are formed to one major side of a dielectric base 5 to form the strip line resonator using an input/output terminal 10 in common. Since the plural sets of the strip line resonators whose resonance frequency differs are constituted on the same dielectric base 5, the mount space on the mount base is saved and the transmission loss between the resonators is reduced and the cost is also reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripline resonator used as a plurality of filters and the like.

[0002]

2. Description of the Related Art For example, a plurality of filters as shown in FIG. 4 are used in a high frequency circuit section of a wireless communication device. In FIG. 4, TX is a transmission filter and RX is a reception filter, and these input / output units are commonly connected and connected to the connector of the antenna ANT. TX filter TX
A transmission circuit and a reception circuit are connected to the and the reception filter RX via a bandpass filter BPF, respectively.
The transmission filter TX is composed of a bandpass filter which passes the transmission frequency band or a band stop filter which has an attenuation band in the reception band, and the reception filter RX is composed of a bandpass filter which passes the reception band and has an attenuation pole in the transmission band, The duplexer DPX is composed of both filters. When configuring a high frequency circuit unit in such a communication device, for example, a stripline filter is generally used on the mobile station side in an 800 MHz band mobile communication system, and as shown in FIG. It is implemented in. In FIG. 5, reference numeral 3 is an insulator substrate having a connection line 4 formed on its surface, and reference numerals 1 and 2 are strip line filters constituting the TX filter and RX filter shown in FIG. 4, respectively.

[0003]

However, when a high frequency circuit section is constructed by using a plurality of filters in this way,
The mounting space of the filter on the substrate is widened, which has been a factor preventing the miniaturization of the entire device. Moreover, since the connection line is provided on the mounting board having a low dielectric constant,
The transmission loss due to the connection line is large. Further, there is a problem that the manufacturing cost increases because each filter is individually manufactured.

An object of the present invention is to solve the above-mentioned various problems and to provide a stripline resonator in which the size of the device is reduced, the transmission loss is reduced, and the manufacturing cost is reduced.

[0005]

In the stripline resonator of the present invention, a plurality of sets of stripline resonance electrodes having different resonance frequencies are coupled and arranged on one main surface of a dielectric substrate, and input / output electrodes are formed. The ground electrode is formed on the other main surface.

[0006]

In the stripline resonator of the present invention, a plurality of stripline-shaped resonant electrodes formed on one main surface of the dielectric substrate, a plurality of input / output electrodes, and a ground electrode formed on the other main surface are provided. A set of stripline resonators is constructed. Since the plurality of stripline resonators are formed on the common dielectric substrate as described above, the mounting space is reduced as compared with the case where the plurality of stripline resonators are mounted on the mounting substrate. Further, transmission loss is reduced by using each resonator as a filter and connecting the filters on the dielectric substrate. Further, since the number of parts is reduced, the manufacturing cost is also reduced.

[0007]

1 shows the structure of a stripline resonator used as a duplexer as an embodiment of the present invention.
~ Shown in FIG. FIG. 1 is a perspective view of a stripline resonator before assembly. In FIG. 1, 5 is a dielectric substrate,
6a, 6b, 6 on one main surface (upper surface in the figure)
A plurality of stripline resonance electrodes indicated by c, 6d, 7, 8d, 8c, 8b and 8a are formed. On the side surface of the dielectric substrate 5, the resonance electrodes 6b, 6c, 6d, 8d,
A side ground electrode 12 is formed to connect the short-circuited ends of 8c and 8b to the ground. In addition, the resonance electrodes 6a, 7, 8
Signal input / output terminals 9, 10 and 11 are formed at one end of a, respectively. Further, a ground electrode 13 is formed on the other main surface (lower surface in the figure) of the dielectric substrate 5 on substantially the entire surface except for the vicinity of the portions where the input / output terminals 9, 10, 11 are formed. In this way, two sets of λ / 4 interdigital stripline resonators with one end open and the other end short-circuited are constructed. The central resonance electrode 7 has resonance electrodes 6d adjacent to both sides thereof,
Since it is coupled to both 8d, the terminal 10 can be used as a common input / output terminal. For example, the terminal 9-10 can be used as an RX filter, and the terminal 11-10 can be used as a TX filter.

The substrate 10 on which various electrodes are formed as described above
0, and a substrate 101 on which electrode patterns having a mirror symmetry relationship with these electrode patterns are formed, and the resonance electrode formation surfaces of the two are bonded together to form a triplate-type stripline resonator. Constitute. In the substrate 101 in FIG. 1, 15 is a dielectric substrate, 14 is a ground electrode formed on the back surface side of the resonance electrode formation surface, and 12 is formed on four side surfaces except the vicinity of the input / output terminals 9, 10, and 11. This is a side ground electrode.

FIG. 2 shows the two substrates 100, 1 shown in FIG.
FIG. 3 is an external perspective view of a triplate-type stripline resonator formed by bonding 01, and FIG. 3 is a central sectional view thereof.
In this way, a triplate-type stripline resonator having two sets of stripline resonance electrodes 6a to 7 and 7 to 8a and having three input / output terminals 9, 10 and 11 exposed at a part of the side surface is provided. Constitute.

In the above-described embodiment, two sets of band pass filters are formed on the dielectric substrate so that the common input / output terminal is drawn out from the central portion of the substrate. It is also possible to form, for example, the TX filter shown in FIG. 4 and one BPF connected thereto on the body substrate, and further, the TX filter, the RX filter and the two BPFs are formed.
It is also possible to construct the PF on a common dielectric substrate.

Further, in the embodiment, an interdigital type triplate type stripline resonator is constructed.
A single dielectric substrate may be used to form a microstrip line, and the resonance electrode may be a combline type.

Further, in the embodiment, 2 is formed in the central portion of the dielectric substrate.
Although the common input / output electrodes were formed on two stripline resonators, multiple stripline resonators were configured on a common dielectric substrate, and the stripline resonators were mounted on the mounting substrate. The devices may be connected by a connection line on the mounting board.

[0013]

According to the present invention, the following effects can be obtained.

(1) The mounting space on the mounting board is reduced, and the entire apparatus can be easily miniaturized.

(2) The transmission loss is reduced by connecting the resonators on the dielectric substrate having a higher Q than the mounting substrate.

(3) Stable characteristics can be obtained without adverse effects due to variations in mounting positions when mounting a large number of filters on a mounting board.

(4) Combined with the reduction of the number of parts, the total cost can be kept low.

[0018]

[Brief description of drawings]

FIG. 1 is a perspective view of a stripline resonator according to an embodiment of the present invention before assembly.

FIG. 2 is an external perspective view of the stripline resonator after assembly.

FIG. 3 is a central cross-sectional view of a stripline resonator.

FIG. 4 is a block diagram of a high frequency circuit unit of the wireless communication device.

FIG. 5 is a partial perspective view showing a mounting structure of a conventional stripline resonator.

[Explanation of symbols]

 1, 2-stripline filter 3-mounting substrate 4-connection line 5-dielectric substrate 6,7,8-resonance electrode 9,10,11-input / output terminal 12-side ground electrode 13,14-ground electrode 15- Dielectric substrate

Claims (1)

[Claims] 1. A plurality of sets of stripline resonance electrodes having different resonance frequencies are coupled and arranged on one main surface of a dielectric substrate, input / output electrodes are formed, and a ground electrode is formed on the other main surface. Stripline resonator.