JPS61290801A - Microstrip resonator - Google Patents

Abstract

PURPOSE:To attain miniaturization, stability and low cost of the circuit by constituting the titled resonator of a rectangular dielectric, the 1st conductor arranged on the 1st face of dielectric, and the 2nd and 3rd conductors separated mutually by a gap formed on the 2nd face opposed to the 1st face of the dielectric and arranged on the 2nd face. CONSTITUTION:When the conductor 3 is connected to ground, the conductor 4 opposed to the conductor 3 forms a microstrip line, the line length is the same as that of the conductor 3 and the part of the conductor 4 opposed to the conductor 2 and the part of the conductor 2 form a capacitor via the dielectric 1. A capacitor 6 is capacitor by the conductor 2 and a capacitor 7 is a capacitor by the conductor 4 and the dielectric 1. A microstrip line 8 has the same line length as that of the conductor 3 and consists of the conductors 3, 4 and the dielectric 1 and acts like a resonator resonated at a frequency corresponding to 1/2 wavelength according to the effective dielectric constant decided by the size of the conductor 3, the dielectric constant and the distance between the conductors 3 and 4. When the conductors 3, 4 at the end face of the opposite side to the conductor 2 are connected, a resonator resonated at a frequency corresponding to 1/4 wavelength is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a resonator using a dielectric material, and particularly to a microstrip resonator suitable for a microwave band filter or oscillator.

[Background of the invention]

The conventional microstrip resonator is disclosed in Japanese Patent Application Laid-Open No. 59-10
As described in No. 7605, two opposing rectangular parallelepiped dielectrics
It is a resonator with conductors arranged on one side and one conductor grounded to form a microstrip line. This resonator is constructed by blocking only the resonance aK made of a microstrip line, and sufficient consideration has not been given to the connection between this resonator and the circuit in which it is used.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of conventional block microstrip resonators, and to take into account connection with circuits in which microstrip resonators are used.
The purpose of the present invention is to provide an IJ tube common camera block.

[Summary of the invention]

A capacitor having capacitance between the strip conductors forming the four microstrip resonators is inserted into the same microstrip resonator block.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. ,?
Figure 1 shows a plan view (-) and a side view (b) of a microstrip resonator.

In the figure, 1 is a rectangular parallelepiped dielectric, 2, 3° 4 is a conductor, and 5 is a gap. If conductor 3 is connected to ground,
The conductor 4 facing the conductor 3 forms a microstrip line, the line length of which is the same as that of the conductor 3, and the conductor 2 and the portion of the conductor 4 facing the conductor 2 form a capacitor via the dielectric 1. It turns out. This microstrip resonator is represented by an equivalent circuit as shown in FIG. 6 is connected to conductor 2, 7 is a capacitor made up of conductor 4 and dielectric 1, 8 has the same line length as conductor 3, and conductor 3. A microstrip line consisting of a conductor 4 and a dielectric material serves as a resonator that resonates at a frequency corresponding to the T wavelength according to the size and dielectric constant of the conductor 3, and the effective dielectric constant determined by the distance between the conductors 5 and 40. When the conductor 3 and conductor 4 on the end face opposite to the conductor 2 are connected, a resonator is formed that resonates at a frequency equivalent to one wavelength.

What is Figure 3? A bandpass filter is constructed using the embodiment shown in FIG. 1, and (4) is a plan view.

(b) is a side view. Components in the same figure that have the same functions as those in FIG. 18
is a dielectric substrate, 9.10 is a signal input or output line,
? 1 and 12° are ground conductors, 13 is a gap, and 14 is the first
This is the microstrip resonator shown in the figure. Dielectric substrate 50
A microstrip circuit board is formed by arranging ground conductors 1L12 on both sides, an input line 9 and an output line 1G, and the microstrip resonators 14 mentioned above are placed on the board in parallel to each other as shown in the figure. The conductor 2 is connected to the input line 9 or the output line 10, the conductor 3 is connected to the ground conductor 11, and together with the capacitor formed by the gap 13, the band pass filter described in JP-A-56-43801 is used. It is possible to construct a filter having characteristics equivalent to . In this case, the use of an expensive dielectric substrate with good electrical characteristics can be limited to the size shown in FIG. 1, which is effective in reducing costs and is also advantageous in mounting.

By arbitrarily selecting the temperature coefficient of permittivity of the dielectric of the resonator shown in Figure 1, the resonance characteristic stability can be set arbitrarily, which is effective for temperature compensation. Needless to say, it can be made into any shape, and the area of the circuit board to which it is attached can be used effectively.

,? Considering mass production efficiency, it is effective to use a microstrip resonator like the one shown in Figure 1 by cutting out a dielectric substrate with a conductor arranged on a wider area. When cut out, resonance characteristics are likely to deteriorate due to peeling of the conductor, chipping of the conductor and dielectric material, etc. at the cut end face. Therefore, another embodiment as shown in FIG. 4 will be described.

Figure 4 shows a top view (a) and a side view (b) of a microstrip resonator.

1 is a rectangular parallelepiped dielectric, 14, 15 and 16 are conductors, and 17 is a gap. As for the operation? Same as the microstrip resonator in Figure 1, except for 14.15.16
Each of the conductors is arranged at a certain distance from the end face of the dielectric 1, thereby reducing loss of the conductor due to chipping of the dielectric at the end.

〔Effect of the invention〕

According to the present invention, an expensive dielectric substrate can be effectively utilized, and furthermore, the resonator can be formed of a dielectric material different from that of the circuit board to which the resonator of the present invention is attached. It is effective in making circuits smaller, more stable, and lower in cost.

[Brief explanation of the drawing]

Figures 1 (a) and (') show an embodiment of the present invention; a plan view and a side sectional view of a microstrip resonator; Figure 2 is an equivalent circuit diagram of the resonator of the present invention; Figure 3 ('' ), C4) are plan views and side sectional views showing the configuration of a band-pass filter using the resonator of the present invention, and Figures 4 (cL) and (J!r) are microscopic views showing other embodiments of the present invention. 1) A plan view and a side sectional view of an IJ tube resonator. 1... Dielectric, 18-... Dielectric substrate, 2.44...
·conductor,. 9.10... Input/output line, lL12... Ground conductor,
14...Resonator, 14.15.16-...Conductor, 5.
...Gap, 17...Gap.

Claims (1)

[Claims] 1. A rectangular parallelepiped dielectric, a first conductor disposed on a first surface of the dielectric, and a second conductor formed on a second surface opposite the first surface of the dielectric. second and third conductors separated from each other by a gap and disposed on a second surface. 2. The microstrip according to claim 1, in the knob resonator, the first, second and third conductors are arranged at a certain distance from the periphery of the spear 1 or the second surface. A microstrip resonator characterized in that it is arranged on a surface of.