Directional coupler
AssigneeScientific Components Corporation
InventorsRadha Setty, Wei Ping Zheng, Igor Lumelskiy
Life of this patent
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Abstract
A directional coupler that has a small package size and repeatable electrical characteristics. The directional coupler includes a low temperature co-fired ceramic (LTCC) substrate with several layers. Electrical components such as resistors and capacitors are integrated within the LTCC substrate. A transformer is attached to the upper surface of the LTCC substrate and is electrically connected to the resistors and capacitors. The LTCC substrate has electrically conductive vias extending therethrough. The vias are used to make electrical connections between the layers of the LTCC substrate.
Claims25
A directional coupler comprising:
- a) a substrate having a plurality of layers;
- b) a film resistor formed on a top layers;
- c) a capacitor formed between two of the layers;
- d) a ground plane formed on one of the layers;
- e) a transformer attached to the top layer over the resistor, and the transformer electrically connected to the resistor and capacitor;
- and
- f) a plurality of vias extending between the layers for providing electrical connections between the resistor, capacitor, ground plane and transformer.
A coupler for providing coupling between an input port and a coupled port, the coupler having an output port and a terminated port, the coupler comprising:
- a) a multi-layered low temperature co-fired ceramic substrate, the substrate having a top surface and a bottom surface;
- b) a plurality of first terminals located on the top surface and a plurality of second terminals located on the bottom surface;
- c) a transformer attached to the top surface and electrically connected to the first terminals;
- and
- d) a plurality of vias extending through the substrate for providing an electrical connection between the first terminals and the second and
- e) a resistor formed on the top surface, under the transformer, the resistor electrically connected with the transformer.
A coupler comprising:
- a) an input port, a coupled port, an output port and a terminated port;
- b) a resistor connected to the terminated port;
- c) a capacitor connected to the terminated port;
- d) a low temperature co-fired ceramic substrate having a plurality of layers, the resistor formed on a first layer and the capacitor being formed on the substrate;
- e) a transformer attached to the substrate and electrically connected to the ports;
- f) an overglaze located over the resistor for protecting the resistor;
- and
- g) a plurality of vias extending through the substrate for providing an electrical connection between the transformer, the resistor, the capacitor and the ports.
Dependencies are inferred from the claim text.