Stripline filter with improved resonator structure

A stripline filter apparatus comprising:

• a first ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• a second ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• at least one resonator device including first and second resonator halves situated on the inner surfaces of said first and second substrates, respectively, said first resonator half being situated in a first groove situated in the inner surface of said first substrate, said second resonator half being situated in the inner surface of said second substrate in a second groove aligned with said first groove, wherein said first and second grooves exhibit half ellipsoidal shapes;
• and
• said first and second substrates being sandwiched together with the inner surfaces of said first and second substrates facing each other.

A stripline filter apparatus comprising:

• a first ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• a second ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• at least one resonator device including first and second resonator halves situated on the inner surfaces of said first and second substrates, respectively, said first resonator half being situated in a first groove situated in the inner surface of said first substrate, said second resonator half being situated in the inner surface of said second substrate in a second groove aligned with said first groove, wherein said first and second resonator halves exhibit half ellipsoidal shapes;
• and
• said first and second substrates being sandwiched together with the inner surfaces of said first and second substrates facing each other.

A stripline filter apparatus comprising:

• a first ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• a second ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• at least one resonator device including first and second resonator halves situated on the inner surfaces of said first and second substrates, respectively, said first resonator half being situated in a first groove situated in the inner surface of said first substrate, said second resonator half being situated in the inner surface of said second substrate in a second groove aligned with said first groove, wherein said first and second grooves exhibit substantially rectangular geometries in cross-section with rounded corners;
• and
• said first and second substrates being sandwiched together with the inner surfaces of said first and second substrates facing each other.

A stripline filter apparatus comprising:

• a first ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• a second ceramic substrate including inner and outer opposed surfaces and including a metallized ground plane situated on said outer surface;
• at least one resonator device including first and second resonator halves situated on the inner surfaces of said first and second substrates, respectively, said first resonator half being situated in a first groove situated in the inner surface of said first substrate, said second resonator half being situated in the inner surface of said second substrate in a second groove aligned with said first groove, wherein said first and second resonator halves exhibit substantially rectangular geometries in cross-section with rounded corners;
• and
• said first and second substrates being sandwiched together with the inner surfaces of said first and second substrates facing each other.