Circuit board structure for high frequency signals

A circuit board structure for high frequency signals, comprising:

• a dielectric plastic film;
• and
• an electrical conductive circuit layer embedded in the dielectric plastic film, exposed to an upper surface of the dielectric plastic film, and including a plurality of circuit patterns and a plurality of connection pads, each of the plurality of circuit patterns having a base part connected to a circular bottom part, the base part being exposed to the upper surface and having a uniform width, the circular bottom part having a shape of a lower hemisphere with a largest horizontal cross section at a top of the lower hemisphere where the base part is connected;
• wherein, the circuit patterns are electrically connected to the connection pads, the largest horizontal cross section of the lower hemisphere has a diameter no greater than the uniform width, and the circular bottom part is incorporated with the base part as an integrated body.

A circuit board structure for high frequency signals, comprising:

• a dielectric plastic film;
• and
• an electrical conductive circuit layer embedded in the dielectric plastic film, projecting to an upper surface of the dielectric plastic film, and including a plurality of circuit patterns and a plurality of connection pads, each of the plurality of circuit patterns having a base part connected to a circular top part and a circular bottom part, the circular bottom part and the base part being embedded in the dielectric plastic film, the circular top part having a shape of an upper hemisphere protruding from the upper surface with a largest horizontal cross section at a bottom of the upper hemisphere where the base part is connected, the base part having a uniform width, the circular bottom part having a shape of a lower hemisphere with a largest horizontal cross section at a bottom of the lower hemisphere where the base part is connected;
• wherein the circuit patterns are electrically connected to the connection pads, the largest horizontal cross section of the upper hemisphere has a diameter no greater than the uniform width, the largest horizontal cross section of the lower hemisphere has a diameter no greater than the uniform width, and the circular top part and the circular bottom part are incorporated with the base part as an integrated body.