Voltage controlled oscillator small in reduction of inductance and Q

Abstract

The voltage-controlled oscillator of the present invention comprises: a circuit substrate (1) formed by stacking a plurality of insulating substrates (2); a wiring pattern (3) formed on the surface of the circuit substrate (1); The electronic component (8) mounted on it; the resonant stripline (5) provided on the inner layer of the circuit substrate (1); the circuit substrate (1) between the wiring pattern (3) and the stripline (5) The grounding pattern (7) formed on the inner layer of the grounding pattern (7) reduces the inductance and the Q value by passing the conductor removal portion (7a) of the grounding pattern (7) near the part with high current density including the strip line (5). Furthermore, a portion of the strip line (5) and the wiring pattern (3) are shielded by the ground pattern (7), and as a result, a voltage controlled oscillator with good shielding characteristics is obtained. Provided is a voltage-controlled oscillator with good shielding properties between a strip line and a wiring pattern, and with less drop in inductance and Q value.

Description

technical field [0001] The present invention relates to a voltage-controlled oscillator suitable for use in portable telephones and the like. Background technique [0002] First, the drawing of a conventional voltage-controlled oscillator will be described. Figure 13 It is an exploded perspective view of a conventional voltage-controlled oscillator, Figure 14 is a cross-sectional view of main parts of a conventional voltage-controlled oscillator. [0003] Second, based on Figure 13 , Figure 14 The structure of the conventional voltage-controlled oscillator will be described. The circuit board 51 is formed by laminating a plurality of thin insulating plates 52. On the surface 51a of the circuit board 51, a wiring pattern 53 composed of a conductive pattern is provided, and, The entire back surface 51b of the circuit board 51 is provided with a ground conductor 54 composed of a conductive pattern. [0004] In addition, the inner layer of the circuit board 51 is provided...

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Problems solved by technology

[0009] However, in such a conventional voltage-controlled oscillator, the ground pattern 56 is not provided on the surface side of the strip line 55, and the inductance and Q However, since the entire surface of the stripline 55 faces the surface 51a of the circuit board 51 due to the conductor cutout portion 56a, the shielding characteristic between the stripline 55 and the wiring pattern 53 deteriorates.

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