JPS62298202A - Ring type resonator - Google Patents

Abstract

PURPOSE:To block a harmonic frequency of a resonance frequency or an optional frequency by providing a 2nd transmission line coupled in a way of distribution with a part of a 1st transmission line of ring form and providing a capacitor between the 1st transmission line and ground. CONSTITUTION:A tuning capacitor 7 and a resonance transmission line 8 form the titled ring type resonator having a mode close to the TEM mode. The resonance frequency depends on the tuning capacitor capacitance and the length of the resonance transmission line. A coupling capacitor 6 exists as the input/ output terminal of the resonance circuit. One capacitor 6 is provided in general as the input/output terminal of the resonance circuit and further, the resonance transmission line 8 and a coupling transmission line 9 are coupled in a distribution way to form another input/output terminal thereby isolating the input and output. Moreover, a frequency block capacitor 11 is provided between the line 8 and ground in the vicinity of the distributed coupling, and the harmonic frequency of the resonance frequency or an optional frequency is blocked by adjusting the capacitance and said distributed coupling condition.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a ring-shaped resonator used in a filter or oscillator of various radio frequency devices, communication devices, measuring instruments, etc. be.

Conventional Technology TEM mode resonators are most often used as small resonators used in high frequency filters, oscillators, etc., and there are many commercially available publications regarding these resonators (for example, Yoshihiro Konishi, 1 Microwave Integration). There are many descriptions in the circuit "Circuit".For example, in Figure 3,
) is an example of an open-ended 1/2 wavelength resonator, and 1 is a resonant line. Figure 3(b) shows a ring-shaped resonant line 1.
The wavelength resonator shown in FIG. 3(C) is made smaller than the one shown in FIG. 3(b) by providing a gap 4 in the resonant line 3 and connecting a capacitor 5 to the gap. By adopting such a structure, the resonant line length can be reduced to 1/2 wavelength or less, and a resonator suitable for miniaturization can be realized.

Since these resonators can be manufactured on a dielectric substrate by printing technology or photoenotinking technology, they are suitable for mass production and are used as resonators with good reproducibility of characteristics.

Problems to be Solved by the Invention However, the resonant frequency of the above-mentioned resonator is determined by the physical shape, and there is a resonant moat even at a frequency that is an integral multiple of the resonant frequency. For this reason, filters and oscillators using this resonator have the drawback that harmonic frequencies pass through and oscillate.The present invention connects a capacitor between one point of the ring-shaped resonator and the ground, and furthermore, the ring-shaped resonator is A part of the first transmission line and the second transmission line are distributed electromagnetically coupled, and a capacitor to ground is provided on the first transmission line,
The above problem is solved by extracting the output.

According to the above-mentioned structure, the present invention blocks harmonic frequencies of the resonant frequency or arbitrary frequencies by the coupling portion of the first transmission line and the second transmission line of the grounded capacitor Salling type. It is.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.

In Fig. 1, 6 is a ring-shaped resonant coupling capacitor;
7 is a tuning capacitor for ring resonance, 8 is a transmission line for link resonance, 9 is a coupling river transmission line for output extraction, transmission line, 1
0 is a capacitor for taking out the output, and 11 is a grounding capacitor for blocking frequency.

The operation of the above configuration will be explained below.

First, the tuning capacitor 7 and the resonant transmission line 8 make it 18M.
A ring-shaped resonant circuit close to the mode is formed. The resonant frequency is determined by the tuning capacitor capacity and the length of the resonant transmission line. A coupling capacitor 6 is provided at the input and output ends of this resonant circuit. Generally, the external end of the resonant circuit has one capacitor 6, but in this embodiment, a resonant transmission line 8 and a coupling transmission line 9 are further coupled in a distributed manner to form another input/output end. This structure provides separation between input and output. Further, a capacitor 11 for open frequency is provided between ground and near the distributed coupling, and by adjusting the capacitance of this capacitor and the above-mentioned distributed coupling conditions, harmonic frequencies of the resonant frequency or arbitrary frequencies can be blocked. You can.

FIG. 2 shows the frequency characteristics when this resonator is used as a filter. A is the resonant frequency and B is the blocking created by the configuration of FIG. As is clear from the figure, according to the configuration of FIG. 1, harmonic frequencies of the resonance frequency or arbitrary frequencies can be blocked.

In this way, by distributively coupling the coupling transmission line 9 to the ring-shaped resonant transmission line 8 close to the 18M mode and using it as an input/output terminal, and by providing a grounding capacitor 11 near the distributed coupling part, resonance with a blocking band can be achieved. It is possible to realize a vessel.

In the above description, only the coupling transmission line 9 has been described, but an additional transmission line may be connected to both ends or one end of the coupling transmission line 9 for impedance matching at the input and output ends.

Effects of the Invention As described above, the present invention provides a second transmission line that is distributedly coupled to a part of the link-shaped first transmission line, and
By providing a capacitor between the first transmission line and the ground, it is possible to block harmonic frequencies of the resonant frequency, even arbitrary frequencies, which has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a link type resonator according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of the structure shown in FIG. 1, and FIG. 3 is a plan view of a conventional resonator. 6... - Coupling capacitor for ring type resonance, 7 - Tuning capacitor for ring type resonance, 8... Transmission line for ring type resonance, 9... Transmission line for coupling, 10... Capacitor for output extraction, 11 Grounding capacitor for blocking frequency. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure Shoulder Bead ≦, Figure 3 <a> (b)

Claims (1)

[Claims] a ring-shaped first transmission line connected in parallel to the resonance capacitor and having a gap; a coupling capacitor connected to the gap of the first transmission line; and one end connected to the first transmission line. , a ring-shaped resonator comprising a blocking frequency capacitor whose other end is grounded, and a second transmission line that is distributedly coupled to a part of the first transmission line.