Coupling device for coaxial cable and antenna apparatus
First Claim
1. A coupling device for a plurality of coaxial cables, which is adapted for carrying out coupling between the coaxial cables through a dielectric plate, the device comprising:
- a pair of center conductor coupling electrodes disposed so that said electrodes are opposite to each other by placing the dielectric plate between the center conductor coupling electrodes, and respectively connected to center conductors of the coaxial cables; and
a pair of external conductor coupling electrodes disposed so that they are opposite to each other by placing the dielectric plate between the external conductor coupling electrodes, and respectively connected to external conductors of the coaxial cables, wherein the external conductor coupling electrodes are formed so that electric length of the electrodes in an extending direction of the electrodes from the junction between the external conductors and the external conductor coupling electrodes becomes equal to multiple of odd number of substantially one fourth wavelength of a passing signal transmitted through the coaxial cables.
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Accused Products
Abstract
A coupling device for coaxial cable which can maintain coaxial transmission mode of low loss is provided. In the coaxial cable coupling device of the capacitor coupling type, in the case where center conductor coupling electrodes for connecting between center conductors of the coaxial cables and external conductor coupling electrodes for connecting between external conductors are used, electric length of the external conductor coupling electrode is set to length of substantially one fourth (1/4) wavelength, or length of multiple of odd number of substantially one fourth (1/4) wavelength of a passing signal. Thus, transmission by the coaxial transmission mode is carried out at an extremely low loss.
40 Citations
8 Claims
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1. A coupling device for a plurality of coaxial cables, which is adapted for carrying out coupling between the coaxial cables through a dielectric plate, the device comprising:
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a pair of center conductor coupling electrodes disposed so that said electrodes are opposite to each other by placing the dielectric plate between the center conductor coupling electrodes, and respectively connected to center conductors of the coaxial cables; and a pair of external conductor coupling electrodes disposed so that they are opposite to each other by placing the dielectric plate between the external conductor coupling electrodes, and respectively connected to external conductors of the coaxial cables, wherein the external conductor coupling electrodes are formed so that electric length of the electrodes in an extending direction of the electrodes from the junction between the external conductors and the external conductor coupling electrodes becomes equal to multiple of odd number of substantially one fourth wavelength of a passing signal transmitted through the coaxial cables. - View Dependent Claims (2, 3, 4)
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5. An antenna apparatus comprising:
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an antenna installed on a first surface on one side of a dielectric plate; a coaxial cable having a center conductor and an external conductor, wherein said external conductor is provided on a second surface on the other side of said dielectric plate; first and second center conductor coupling electrodes having substantially the same shape and area, and being disposed on said first and second surfaces of said dielectric plate, respectively, wherein said first center conductor coupling electrode is connected to said antenna and said second center conductor coupling electrode is connected to said center conductor; and first and second external conductor coupling electrodes having substantially the same shape and area, and being disposed on said first and second surfaces of said dielectric plate, respectively, wherein said first external conductor coupling electrode is connected to said antenna and said second external conductor coupling electrode is connected to said external conductor, said first and second external conductor coupling electrodes are formed having an electric length equal to a multiple of odd number of substantially one fourth wavelength of a passing signal and said first and second external conductor coupling electrodes have a predetermined shape different from that of said first and second center conductor coupling electrodes, respectively, and have a predetermined position to said first and second center conductor coupling electrodes, respectively. - View Dependent Claims (6, 7, 8)
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Specification