Metamaterial structure
A second conductor ( 200 ) is opposite to a first conductor ( 100 ), and is repeatedly arranged. A plurality of vias ( 400 ) are provided to each of a plurality of second conductors ( 200 ), and provide an inductance component between the first conductor ( 100 ) and the second conductor ( 200 ). A third conductor ( 300 ) is connected to a first one of the second conductors ( 200 ) through a via ( 500 ), and is opposite to a second one of the second conductors ( 200 ) located next to the first one of the second conductors ( 200 ), to thereby form a transmission line between the first one of the second conductors and the second one of the second conductors ( 200 ). That is, the third conductor ( 300 ) functions as a stub together with the second one of the second conductors ( 200 ).
1. A structure comprising:
a first conductor;
a first one of a plurality of second conductors, a second one of the second conductors, and a third one of the second conductors opposite to the first conductor, which are arranged in line at a same layer;
an inductance element provided at least one for each of the plurality of second conductors, which provides an inductance component between the first conductor and the second conductor; and
a third conductor, electrically connected to the first one of the second conductors, which is spaced from and overlaps with the second one of the second conductors located next to the first one of the second conductors, without the third conductor being electrically connected to the second one of the second conductors.
2. The structure according to claim 1 , wherein three or more second conductors are provided, and
the third conductor is provided between all of the second conductors located next to each other.
3. The structure according to claim 1 , wherein the third conductor is located at the opposite side to the first conductor through the second conductor.
4. The structure according to claim 1 , wherein the third conductor is located between the first conductor and the second conductor.
5. The structure according to claim 1 , wherein the inductance element includes
a via of which one end is connected to the first conductor, and
a fourth conductor which is connected to the other end of the via and formed on a layer different from that of the second conductor, and is opposite to the second conductor.
6. The structure according to claim 1 , wherein one of the second conductors located at an end of an array of the plurality of second conductors is set as a reference second conductor, and
the conductor which is close to the reference second conductor out of the second conductors located next to each other is set as the first one of the second conductors.
7. The structure according to claim 1 , wherein the third conductor is formed on the same layer as the second conductor.
8. The structure according to claim 7 , wherein the second one of the second conductors includes a concave portion at a side which is opposite to the first one of the second conductors, and
the third conductor extends from the first one of the second conductors to an inner side of the concave portion.
9. The structure according to claim 8 , wherein the first one of the second conductors and the second one of the second conductors are arranged in a first direction, and
the third conductor extends from a side which is opposite to the second one of the second conductors in the first one of the second conductors to a direction intersecting the first direction.
10. The structure according to claim 1 , further comprising a power feed line which is connected to the first conductor and the second conductor located at an end of the array of the plurality of second conductors,
wherein the structure is at least a portion of an antenna.
11. The structure according to claim 10 , wherein the transmission line has an open end, and
when a wavelength of a signal which is input to the power feed line is set to λ, a length of the transmission line is equal to λ/4.
12. The structure according to claim 1 , wherein the third conductor forms a transmission line using the second one of the second conductors as a return path.
13. The structure according to claim 12 , wherein the transmission line is a microstrip line.
14. The structure according to claim 12 , wherein the transmission line is a coplanar line.
15. The structure according to claim 12 , wherein the transmission line is a balanced type transmission line.
16. The structure according to claim 12 , wherein the transmission line has an open end.
17. The structure according to claim 16 , wherein a signal is input to the first conductor and a plurality of the second conductors, and
when a wavelength of the signal is set to λ, a length of the transmission line is equal to or less than λ/4.
18. A structure comprising:
a first conductor;
a second conductor, opposite to the first conductor, which is linear;
a plurality of slits that are repeatedly provided in the first conductor and extend in a direction intersecting the second conductor, which has a larger width than that of the second conductor; and
an inductance element that provides an inductance component between the first conductor and the second conductor,
wherein in a planar view of the structure, a connection part between the inductance element and the first conductor is located between slits, of the plurality of slits, that are adjacent to each other.
19. The structure according to claim 18 , wherein the first conductor forms a transmission line in a portion provided with the slit.
20. The structure according to claim 19 , wherein the transmission line is a slot line.