High frequency ceramic multi-layer substrate

A high frequency ceramic multi-layer substrate comprising:

• a first dielectric layer made of a first dielectric material;
• a first ground electrode being formed on a surface of the first dielectric layer;
• a stripline formed on a surface of the first dielectric layer different from the other surface in contact with the first ground electrode;
• a second dielectric layer made of the first dielectric material, which second dielectric layer being layered on the first dielectric layer interposing said stripline between them;
• a second ground electrode being formed on a surface of the second dielectric layer different from the other surface in contact with the second dielectric layer;
• a third dielectric layer made of a second dielectric material, which third dielectric layer being applied to the second ground electrode;
• an electric circuit provided on the third dielectric layer;
• and
• an electrically conductive line extending through the second and third dielectric layers from a connection point with the stripline to a connection point with the electric circuit without electrical contact with the second ground electrode, the equivalent length of the electrically conductive line from the connection point with the stripline to the electric circuit being a fourth of the wavelength of a signal to be input through the stripline, whereby the length of the electrically conductive line results in high frequency attenuation characteristics;
• further comprising a space of said second and third dielectric layers and said second ground electrode provided above said first dielectric layer to expose a part of said stripline;
• and a high frequency electric circuit arranged at the exposed surface of said first dielectric layer and connected to said stripline.

A high frequency ceramic multi-layer substrate further comprising:

• a first dielectric layer made of a first dielectric material;
• a first ground electrode being formed on a surface of the first dielectric layer;
• a stripline formed on a surface of the first dielectric layer different from the other surface in contact with the first ground electrode;
• a second dielectric layer made of the first dielectric material, which second dielectric layer being layered on the first dielectric layer interposing said stripline between them;
• a second ground electrode being formed on a surface of the second dielectric layer different from the other surface in contact with the second dielectric layer;
• a third dielectric layer made of a second dielectric material, which third dielectric layer being applied to the second ground electrode;
• an electric circuit provided on the third dielectric layer;
• an electrically conductive line extending through the second and third dielectric layers from a connection point with the stripline to a connection point with the electric circuit without electrical contact with the second ground electrode, the equivalent length of the electrically conductive line from the connection point with the stripline to the electric circuit being a fourth of the wavelength of a signal to be input through the stripline, whereby the length of the electrically conductive line results in high frequency attenuation characteristics;
• a fourth dielectric layer applied to said first ground electrode;
• a second stripline formed on the fourth dielectric layer;
• and
• a fifth dielectric layer applied to the second stripline and the fourth dielectric layer;
• wherein said stripline interposed between said first and second dielectric layers consists of two parts separated from each other and electrically conductive lines isolated electrically from the first ground electrode connect the second stripline through the fourth dielectric layer in series to the two parts of said stripline.

A high frequency ceramic multi-layer substrate comprising:

• a first dielectric layer made of a first dielectric material;
• a first ground electrode being formed on a surface of the first dielectric layer;
• a stripline formed on a surface of the first dielectric layer different from the other surface in contact with the first ground electrode;
• a second dielectric layer made of the first dielectric material, which second dielectric layer being layered on the first dielectric layer interposing said stripline between the two dielectric layers;
• a second ground electrode being formed on a surface of the second dielectric layer different from the other surface in contact with the first dielectric layer;
• a third dielectric layer made of a second dielectric material, which third dielectric layer being applied to the second ground electrode;
• a third electrode formed on the third dielectric layer to generate an electrostatic capacitance between the third electrode and the second ground electrode;
• a fourth dielectric layer made of a third dielectric material, which fourth dielectric layer being applied to the third electrode and the third dielectric layer;
• an electric circuit provided on the fourth dielectric layer;
• a first electrically conductive line extending through the second, third and fourth dielectric layers from a connection point with the stripline without electrical contact with the second ground electrode to a connection point with the electric circuit;
• and
• a second electrically conductive line extending between a connection point with the electric circuit to a connection point with the third electrode.