An antenna apparatus comprising: a signal splitter configured to generate a second signal including N equal-phase signals by splitting a first signal received from a signal source; a signal source virtual beam adjustor configured to generate a third signal including N signals by shifting phases of each of the N signals included in the second signal by respective fixed values via delay lines; a transmission beam adjustor configured to generate a fourth signal including N signals by shifting phases of each of the N signals included in the third signal by 0 degree or 180 degrees; and a transmitter including N first transmission antennas respectively configured to transmit the N signals included in the fourth signal, wherein the signal splitter comprises: a signal supplier configured to transmit the first signal; and a receiver including N reception antennas configured to receive the first signal from the signal supplier, wherein the first signal transmitted from the signal supplier is received at a same phase by the N reception antennas, wherein the N reception antennas are arranged in a plane at uniform distances, and the signal supplier comprises N second transmission antennas arranged in a plane at the uniform distances, wherein the signal source virtual beam adjustor is configured to shift the phases of each of the N signals included in the second signal so that the phase of each signal included in the third signal is equal to a phase of the first signal that would reach each of the N first transmission antennas when the first signal would be transmitted from one virtual focal point, wherein the one virtual focal point is defined as 0, 0, -F with respect to a plane on which the N transmission antennas are arranged wherein 0, 0 refer to a center point of the plane and the -F refers to a shift along an axis perpendicularly crossing the plane via its center point; wherein the fixed value of each phase shift is defined by the following equation: Δ φ VFi = 2 π λ x i 2 + y i 2 + F 2 − F whereas: x is a shift from the center point along a width of the plane y is a shift from the center point along a height of the plane i is an index of a unit cell of the N transmission antennas. a signal splitter configured to generate a second signal including N equal-phase signals by splitting a first signal received from a signal source; a signal source virtual beam adjustor configured to generate a third signal including N signals by shifting phases of each of the N signals included in the second signal by respective fixed values via delay lines; a transmission beam adjustor configured to generate a fourth signal including N signals by shifting phases of each of the N signals included in the third signal by 0 degree or 180 degrees; and a transmitter including N first transmission antennas respectively configured to transmit the N signals included in the fourth signal, wherein the signal splitter comprises: a signal supplier configured to transmit the first signal; and a receiver including N reception antennas configured to receive the first signal from the signal supplier, wherein the first signal transmitted from the signal supplier is received at a same phase by the N reception antennas, a signal supplier configured to transmit the first signal; and a receiver including N reception antennas configured to receive the first signal from the signal supplier, wherein the first signal transmitted from the signal supplier is received at a same phase by the N reception antennas, the signal supplier comprises N second transmission antennas arranged in a plane at the uniform distances, wherein the signal source virtual beam adjustor is configured to shift the phases of each of the N signals included in the second signal so that the phase of each signal included in the third signal is equal to a phase of the first signal that would reach each of the N first transmission antennas when the first signal would be transmitted from one virtual focal point, wherein the one virtual focal point is defined as 0, 0, -F with respect to a plane on which the N transmission antennas are arranged wherein 0, 0 refer to a center point of the plane and the -F refers to a shift along an axis perpendicularly crossing the plane via its center point; wherein the fixed value of each phase shift is defined by the following equation: Δ φ VFi = 2 π λ x i 2 + y i 2 + F 2 − F whereas: x is a shift from the center point along a width of the plane y is a shift from the center point along a height of the plane x is a shift from the center point along a width of the plane y is a shift from the center point along a height of the plane i is an index of a unit cell of the N transmission antennas.