Directional coupler
First Claim
1. A directional coupler used in a predetermined frequency band, the directional coupler comprising:
- first, second, third and fourth terminals;
a main line connected between the first terminal and the second terminal;
a first sub line that is connected to the third terminal and electromagnetically coupled to the main line;
a second sub line that is connected to the fourth terminal and electromagnetically coupled to the main line; and
a phase conversion unit that is connected between the first sub line and the second sub line and that causes a phase shift to be generated in a passing signal passing therethrough;
whereina cut-off frequency of the low pass filter is not within the predetermined frequency band used in the directional coupler; and
the phase conversion unit includes a low pass filter.
1 Assignment
0 Petitions
Accused Products
Abstract
A directional coupler used in a predetermined frequency band includes a main line connected between a first terminal and a second terminal. A first sub line is connected to a third terminal and is electromagnetically coupled to the main line. A second sub line is connected to a fourth terminal and is electromagnetically coupled to the main line. A low pass filter is connected between the first sub line and the second sub line and causes a phase shift to be generated in a passing signal passing therethrough in such a manner that the phase shift monotonically increases within a range from about 0 to about 180 degrees with increasing frequency in the predetermined frequency band.
16 Citations
20 Claims
-
1. A directional coupler used in a predetermined frequency band, the directional coupler comprising:
-
first, second, third and fourth terminals; a main line connected between the first terminal and the second terminal; a first sub line that is connected to the third terminal and electromagnetically coupled to the main line; a second sub line that is connected to the fourth terminal and electromagnetically coupled to the main line; and a phase conversion unit that is connected between the first sub line and the second sub line and that causes a phase shift to be generated in a passing signal passing therethrough;
whereina cut-off frequency of the low pass filter is not within the predetermined frequency band used in the directional coupler; and the phase conversion unit includes a low pass filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A directional coupler used in a predetermined frequency band, the directional coupler comprising:
-
first, second, third and fourth terminals; a main line connected between the first terminal and the second terminal; a first sub line that is connected to the third terminal and electromagnetically coupled to the main line; a second sub line that is connected to the fourth terminal and electromagnetically coupled to the main line; a phase conversion unit that includes a low pass filter and is connected between the first sub line and the second sub line and that causes a phase shift to be generated in a passing signal passing therethrough; and a multilayer body including a plurality of insulating layers stacked on each other in a stacking direction, wherein the first sub line, the second sub line, and the phase conversion unit are defined by conductor layers provided on the insulating layers;
whereinthe low pass filter includes; a coil that is not electromagnetically coupled to the main line; and a capacitor that is connected to an end of the coil; and the sub lines are provided between the coil and the main line in the stacking direction. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification