Oscillator and method of manufacturing the same
First Claim
1. An oscillator comprising:
- a substrate provided with a stripline embedded in its interior and ground patterns being formed to sandwich said stripline;
an oscillation circuit mounted on said substrate and electrically connected to said stripline; and
a shielding case on said substrate covering said oscillation circuit, wherein;
a ground electrode is formed on at least one side surface of said substrate and is electrically connected with said ground patterns, said shielding case is electrically connected with said ground electrode, and at least one remaining side surface of said substrate is covered with a shielding plate provided on said shielding case.
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Accused Products
Abstract
In an oscillator employing a triplate type stripline, earth (ground) electrodes are formed only on an opposite pair of side surfaces of a substrate in which the stripline is embedded. An oscillation circuit mounted on the substrate is covered with a shielding case and the remaining side surfaces of the substrate, which are provided with no earth electrodes, are covered with shielding plates which are provided on the shielding case. Connecting portions of the shielding case are electrically connected with the earth electrodes by soldering. Thus, the stripline is electromagnetically shielded in a simple manner so that it is possible to easily manufacture an oscillator employing a stripline at a low cost.
51 Citations
10 Claims
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1. An oscillator comprising:
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a substrate provided with a stripline embedded in its interior and ground patterns being formed to sandwich said stripline; an oscillation circuit mounted on said substrate and electrically connected to said stripline; and a shielding case on said substrate covering said oscillation circuit, wherein; a ground electrode is formed on at least one side surface of said substrate and is electrically connected with said ground patterns, said shielding case is electrically connected with said ground electrode, and at least one remaining side surface of said substrate is covered with a shielding plate provided on said shielding case. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing an oscillator comprising a substrate provided with a stripline embedded therein and ground patterns being formed to sandwich said stripline, and an oscillation circuit electrically connected to the stripline being mounted on said substrate, said method comprising the steps of:
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preparing an mother substrate capable of providing a plurality of individual substrates each provided with said stripline embedded therein and said ground patterns being formed to sandwich said stripline; defining cut lines on said mother substrate for being cut to provide said individual substrates, said cut lines including first and second cut lines for defining respective first and second opposite pairs of side surfaces of said individual substrates, said first cut lines defining side surfaces to be provided with ground electrodes; forming through holes along said first cut lines; forming metal films on the inner surfaces of said through holes; cutting said mother substrate along said first and second cut lines for dividing said through holes provided with said metal films so as to provide a plurality of individual substrates provided with said ground electrodes on said first opposite pairs of side surfaces; mounting an oscillation circuit on each said individual substrate; and covering said oscillation circuit with a shielding case, including covering said second side surfaces of said substrate, which are provided with no ground electrodes, with shielding plates provided on said shielding case, and electrically connecting said shielding case with said ground electrodes. - View Dependent Claims (10)
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Specification