JPH0296402A - Spiral resonator - Google Patents

Abstract

PURPOSE:To miniaturize the shape of a resonator by making a resonator for high frequency into a spiral shape. CONSTITUTION:A resonance line 7 is a transmitting line for resonance formed by two outer-most circumferential parallel lines, the central line of three intermediate parallel lines and two inner-most circumferential parallel lines and at both edges of the line, a tuning capacity 8 for resonance is connected. The construction can be called to be a ring resonator in which the impedance is electrically changed in a step way. Thus, in order to obtain the same resonance line length, the resonator can be formed with a smaller area than the ring resonator of a single line construction and the shape of the resonator can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high frequency spiral resonator used in filters or oscillators of various radio equipment, communication equipment, measuring instruments, etc.

Conventional Technology TEM mode resonators are most commonly used as small resonators used in high-frequency filters, oscillators, etc., and commercial publications regarding these resonators (for example, Yoshihiro Konishi
“Microwave Integrated Circuit°.

There are many descriptions in the Japanese Industrial Report. In FIG. 2, (a) is an example of an open-ended 1/2 wavelength resonator, and 1 is a resonant line. FIG. 2(b) shows a hairpin-structured resonator obtained by folding the FIG. Figure (C) shows a one-wavelength resonator with a ring-shaped resonant line 3, and Figure (d) shows a gap 5 in the resonant line 4 in order to miniaturize Figure (C). It has a structure in which 6 are connected. With such a structure, a resonator with a resonant line length of 1/2 wavelength or less can be realized.

Problems to be Solved by the Invention However, although conventional resonators can shorten the resonant line length to 1/2 wavelength or less, since they have a single line structure, the area occupied by the resonator is required to obtain the desired resonant line length. The problem was that the shape of the resonator could not be made smaller.

The present invention solves the above problems and reduces the size of a resonator.

Means for Solving the Problems In order to achieve the above object, the technical solution of the present invention is as follows:
The resonant line has a spiral structure.

Function The present invention achieves the same effect by forming the resonant line in a spiral shape.
Since the resonant line can be made longer within the dedicated area, the shape of the resonator can be made smaller.

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

In FIG. 1, (a) is an example of a spiral resonator, and 7 is the outermost two parallel lines (characteristic impedance ZI), the center line of the middle three parallel lines (characteristic impedance Z2), and the innermost two parallel lines (characteristic impedance Z2). It is a resonant transmission line formed by a characteristic impedance Z, ), and has a structure in which a resonant tuning capacitor 8 is connected to both ends of the line. (In the case of a multi-H substrate, the capacitor 8 may be formed on another surface.) Figure 1(b) is an equivalent circuit of the spiral resonator shown in Figure 1(a), and this structure is , electrically speaking, it can be said to be a ring resonator whose impedance changes stepwise;
It can be treated in the same way as the ring resonator in figure (d).

Therefore, in order to obtain the same resonant line length, the spiral resonator can be formed in a smaller area than the conventional ring resonator, and the shape of the resonator can be made smaller.

Also, if the characteristic impedance of a single line is 70,
The relationship is Zz>L>Zo. Due to this characteristic, the line length to obtain the same resonant frequency is shorter than that of a conventional ring resonator, and as mentioned above, the shape of the resonator can be made smaller.

In addition to the above-mentioned features, the spiral resonator has the ability to form an inductance without shorting one end of the line, and high Q can be obtained because there is no need for high-frequency grounding. Further, since it can be manufactured on a dielectric substrate by printing technology or photoetching technology, it is easy to planarize it, is suitable for mass production, and has the advantage that a resonator with good reproducibility of characteristics can be obtained.

Note that although a spiral resonator having three turns is illustrated in this embodiment, there is no restriction on the number of turns, and a spiral resonator with any number of turns may be used.

Moreover, although the shape of the spiral resonator is circular, it goes without saying that any shape such as a rectangle can be considered.

Effects of the Invention As described above, the effects of the present invention are that by making the high frequency resonator used in filters and oscillators of various wireless devices into a spiral shape, it is small, has a high no-load Q, and is inexpensive. A resonator has been realized, and the effect is extremely large.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of a spiral resonator according to an embodiment of the present invention, FIG. 1(b) is an equivalent circuit diagram of FIG. 1(a), and FIGS. 2(a) to (d) are conventional This is a plan view of the resonator. 7... Resonant line, 8... Capacity. Name of agent: Patent attorney Shigetaka Awano 1 idiot 1st g (Q) X2>X1nX. (go*-m*-des) Figure (Q) (b) (C) (d)

Claims (1)

[Claims] A spiral resonator comprising a resonance capacitor and a transmission line connected in parallel to the capacitor, the transmission line having a multi-winding structure.