Wave transmission lines and networks – Resonators
Reexamination Certificate
1999-12-14
2001-06-19
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Resonators
C333S219100, C333S235000
Reexamination Certificate
active
06249196
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to resonators having ready-to-use conductor lines mounted with other circuit components on printed circuit boards, and more particularly relates to a resonator in which inductance or impedance may be varied uniformly in the longitudinal direction of a conductor line.
2. Description of the Related Art
A resonator, for example, for determining the oscillating frequency of a voltage-controlled oscillator, has been constructed with a strip conductor line directly formed on a printed circuit board on which other circuit components for the circuit construction are mounted.
FIG. 7
illustrates a conventional resonator. In
FIG. 7
, a printed circuit board
21
has circuit components (not shown) constituting the voltage-controlled oscillator or the like, mounted thereon. A strip conductor line
22
is directly formed on this printed circuit board
21
and is connected to circuit components.
For example, when the oscillating frequency is adjusted, as shown in
FIG. 8
, the inductance or the impedance of the resonator is varied by locally changing the width of a slit
23
provided in the conductor line
22
.
As described above, the conventional resonator, in which the conductor line
22
is used, is directly formed on the printed circuit board on which circuit components are mounted. Accordingly, in a case where conductor lines
22
having different widths or different lengths are required, since the design for each printed circuit board is different, a universal printed circuit board cannot be designed.
Since the oscillating frequency is adjusted by locally changing the width of the slit
23
, the inductance or the impedance of the conductor line
22
varies in accordance with the position of the conductor line
22
in the longitudinal direction thereof. In order to secure the required range of frequency change, the optimal position of the slit
23
must be selected. Moreover, the impedance locally increases in the periphery of the slit
23
. Additionally, as the width of the conductor line
22
decreases, loss therein increases and the Q-factor therein decreases.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a resonator which has a construction allowing it to be mounted on a motherboard in the same manner as other circuit components, thus enabling a universal printed circuit board to be designed, and enabling the inductance or the impedance of the resonator to uniformly vary in the longitudinal direction of the conductor line.
To this end, according to a first aspect of the present invention, there is provided a resonator including an insulating plate having a circular through hole provided, an arc-shaped conductor line formed in the periphery of the through hole and on the top face of the insulating plate or in the inner wall of the through hole, a first electrode connected to one of the edges of the conductor line, and a second electrode connected to the other edge of the conductor line, and wherein the first electrode and the second electrode are provided on a side face of the insulating plate.
This construction allows the resonator to be mounted with other circuit components on the printed circuit board and to be connected to conductors thereon. Therefore, the universal printed circuit board can be achieved by preparing plural resonators, which have different widths and different lengths. Because ground electrodes, and the first and the second electrodes which are connected to the ends of the conductor line, are formed on the side faces of the insulating plate, in the same manner as for other surface-mounted components, it is easy for the resonator to be connected to the printed circuit board.
Moreover, since the width of the conductor line is uniformly changed by cutting edges of the through hole by a drill, there is no discontinuous point in the inductance or the impedance in the longitudinal direction thereof. Thus, there is no risk of loss due to mismatching.
In a resonator according to a first aspect of the present invention, the conductor line may be formed in the periphery of the through hole and on the top face of the insulating plate, a ground conductor may be formed on the bottom face of the insulating plate so as to face the conductor line and a ground electrode, connected to the ground conductor, may be provided on a side face of the insulating plate.
Thus, it is easy to adjust the impedance of the conductor line.
In a resonator according to a first aspect of the present invention, the conductor line may be formed on the inner wall and a ground electrode may be formed on a side face of the insulating plate so as to face the conductor line.
Thus, high Q-factor of the resonator can be maintained. the insulating plate is quadrilateral;
In a resonator according to a first aspect of the present invention, ground electrodes may be provided on three side faces of the insulating plate, and both the first electrode and the second electrode may be provided on the side face of the insulating plate.
Thus, in a case in which the conductor line is mounted on the printed circuit board, the conductor line can be connected to the printed circuit board at the minimum distance.
REFERENCES:
patent: 5208565 (1993-05-01), Sogo et al.
patent: 5945895 (1999-08-01), Ono
patent: 2220526 (1990-10-01), None
patent: 63-142901 (1988-06-01), None
patent: 2-11002 (1990-01-01), None
patent: 7-220927 (1995-08-01), None
patent: 8-186461 (1996-07-01), None
Ishigaki Isao
Shibuya Shuichi
Alps Electric Co. Ltd
Brinks Hofer Gilson & Lione
Nguyen Patricia T.
Pascal Robert
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