Directional coupler
First Claim
1. A directional coupler that is used in a certain frequency band, the directional coupler comprising:
- a first terminal;
a second terminal;
a third terminal;
a fourth terminal;
a main line that is connected between the first terminal and the second terminal;
a sub line that is connected between the third terminal and the fourth terminal and that is electromagnetically coupled to the main line;
a first low pass filter that includes a first coil which is connected between the first terminal and the main line and that has a characteristic in which attenuation increases with increasing frequency in the certain frequency band;
a second low pass filter that includes a second coil which is connected between the second terminal and the main line and that has a characteristic in which attenuation increases with increasing frequency in the certain frequency band; and
a high pass filter that is connected, in parallel to the main line, between a point between the first coil and the first terminal and a point between the second coil and the second terminal and that has a characteristic in which attenuation decreases with increasing frequency in the certain frequency band.
1 Assignment
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Accused Products
Abstract
In a directional coupler, a first low pass filter includes a first coil that is connected between a first outer electrode and a main line and has a characteristic in which attenuation increases with increasing frequency in a certain frequency band. A second low pass filter includes a second coil that is connected between a second outer electrode and the main line and has a characteristic in which attenuation increases with increasing frequency in the certain frequency band. A high pass filter is connected, in parallel to the main line, between a point between the first coil and the first outer electrode and a point between the second coil and the second outer electrode and has a characteristic in which attenuation decreases with increasing frequency in the certain frequency band.
19 Citations
18 Claims
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1. A directional coupler that is used in a certain frequency band, the directional coupler comprising:
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a first terminal; a second terminal; a third terminal; a fourth terminal; a main line that is connected between the first terminal and the second terminal; a sub line that is connected between the third terminal and the fourth terminal and that is electromagnetically coupled to the main line; a first low pass filter that includes a first coil which is connected between the first terminal and the main line and that has a characteristic in which attenuation increases with increasing frequency in the certain frequency band; a second low pass filter that includes a second coil which is connected between the second terminal and the main line and that has a characteristic in which attenuation increases with increasing frequency in the certain frequency band; and a high pass filter that is connected, in parallel to the main line, between a point between the first coil and the first terminal and a point between the second coil and the second terminal and that has a characteristic in which attenuation decreases with increasing frequency in the certain frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification