Slot antenna apparatus, communication system, and method for adjusting angle of radio waves emitted from slot antenna apparatus

A communication system comprising:

• a base station having a signal input/output terminal;
• and
• a slot antenna apparatus connected to the signal input/output terminal;
• wherein the slot antenna apparatus includes:
• a waveguide including a sidewall and having an extending direction;
• a slot provided on the sidewall;
• and
• a dielectric member that is attached to the waveguide and is slidable in the extending direction with respect to the slot, the dielectric member including a first section and a second section, the first section covering the slot at a first slide position, the second section covering the slot at a second slide position next to the first slide position, and the first section and the second section having different relative permittivities or different thicknesses with each other.

A method for adjusting an angle of radio waves emitted from a slot antenna apparatus, the slot antenna apparatus including:

• a waveguide including a sidewall and having an extending direction;
• a slot provided on the sidewall;
• and
• a dielectric member that is attached to the waveguide and is slidable in the extending direction with respect to the slot, the dielectric member including a first section and a second section, the first section covering the slot at a first slide position, the second section covering the slot at a second slide position next to the first slide position, and the first section and the second section having different relative permittivities or different thicknesses with each other;
• the method comprising:
• sliding the dielectric member with respect to the waveguide to the first slide position where the first section covers the slot or to the second slide position where the second section covers the slot.