Transmission line and antenna
A transmission line having, for example, a first frequency-selecting surface.
1. A transmission line having:
a first frequency-selecting surface that covers an outer circumference of a conductor; and
a second frequency-selecting surface provided on a core wire located inside the conductor,
wherein the second frequency-selecting surface is configured to allow electromagnetic waves to pass of a same frequency band as electromagnetic waves passed by the first frequency-selecting surface.
2. The transmission line according to claim 1 , wherein the first frequency-selecting surface is provided on a ground conductor.
3. The transmission line according to claim 1 , wherein the transmission line is a power supply line for a first antenna element in a multi-antenna.
4. The transmission line according to claim 3 , wherein the multi-antenna supports electromagnetic waves of a first frequency and electromagnetic waves of a second frequency; and
wherein the transmission line is configured to:
allow the electromagnetic waves of the first frequency to pass; and
supply the electromagnetic waves of the second frequency to the first antenna element.
5. The transmission line according to claim 1 , wherein the transmission line is a power supply line for a first antenna element in a multi-antenna;
wherein the multi-antenna supports electromagnetic waves of a first frequency and electromagnetic waves of a second frequency;
wherein the transmission line is configured to:
allow the electromagnetic waves of the first frequency to pass;
supply the electromagnetic waves of the second frequency to the first antenna element; and
allow the electromagnetic waves of the second frequency to pass.
6. An antenna comprising:
a transmission line having:
a first frequency-selecting surface that covers an outer circumference of a conductor; and
a second frequency-selecting surface provided on a core wire located inside the conductor,
wherein the second frequency-selecting surface is configured to allow electromagnetic waves to pass of a same frequency band as electromagnetic waves passed by the first frequency-selecting surface; and
a reflective plate.