| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-frequency circuit module which prevents a drop in the Q-value of a microstrip line, formed inside a plurality of dielectric layers which constitute a multilayered substrate. SOLUTION: At least a first dielectric layer 2a, a second dielectric layer 2b, and a third dielectric layer 2c are laminated sequentially. A first grounding conductor layer 13 is formed between the first dielectric layer 2a and the second dielectric layer 2b. A belt-like microstrip line 4 is formed between the second dielectric layer 2b and the third dielectric layer 2c to face opposite the first grounding conductor 3. A first dielectric removed hole 5 which is formed by cutting off the third dielectric layer 2c is formed in the third dielectric layer 2c, so as to face the microstrip line 4. A metal plate 8 which closes the first dielectric removed hole 5 on a face on the side opposite to a face on the side of the second dielectric layer 2c is installed on the third dielectric layer 2c. The metal plate 8 is connected to the first grounding conductor layer 3. |
