Antenna device for beam steering and focusing
Provided is an antenna apparatus including: 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 a phase of each signal included in the second signal; a transmission beam adjustor configured to generate a fourth signal including N signals by shifting a phase of each signal included in the third signal by 0 degree or 180 degrees; and a transmitter including N transmission antennas transmitting respectively transmitting the N signals included in the fourth signal.
1. 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 having a virtual focus at one point by shifting a phase of each signal included in the second signal;
a transmission beam adjustor configured to generate a fourth signal including N signals by shifting a phase of each signal included in the third signal by 0 degree or 180 degrees; and
a transmitter including N transmission antennas respectively transmitting the N signals included in the fourth signal.
2. The antenna apparatus of claim 1 , wherein the signal splitter comprises:
a signal supplier transmitting the first signal; and
a receiver including N reception antennas receiving 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 to generate the second signal including the N equal-phase signals by splitting the first signal.
3. The antenna apparatus of claim 2 , wherein the N reception antennas are arranged in a radiative near-field region of the signal supplier.
4. The antenna apparatus of claim 2 , wherein the N reception antennas are arranged in a plane, and
the signal supplier comprises a waveguide configured to transmit the first signal to arrive at the N reception antennas as a plane wave.
5. The antenna apparatus of claim 2 , wherein the N reception antennas are arranged in a plane at uniform distances, and
the signal supplier comprises N transmission antennas arranged in a plane at the uniform distances.
6. The antenna apparatus of claim 2 , wherein the N reception antennas are arranged in a plane at uniform distances, and
the signal supplier comprises N transmission antennas arranged in a plane quasi-periodically to correspond to the uniform distances.
7. The antenna apparatus of claim 2 , wherein the N reception antennas are slot antennas formed on a ground surface, and
the signal source virtual beam adjustor is coupled to the slot antennas via strip lines.
8. The antenna apparatus of claim 2 , wherein the antenna apparatus comprises a multi-layer substrate comprising three main layers,
wherein a first main layer of the multi-layer substrate includes the transmitter including a patch antenna and the transmission beam adjustor including a switching element capable of changing a phase of a radiation signal of the patch antenna by 0 degree or 180 degrees,
a second main layer under the first main layer of the multi-layer substrate includes the signal source virtual beam adjustor including a fixed phase shift section including a delay line, and
a third main layer under the second main layer of the multi-layer substrate includes the receiver including a reception antenna array.
9. The antenna apparatus of claim 2 , wherein the antenna apparatus comprises a multi-layer substrate comprising two main layers,
wherein a first main layer of the multi-layer substrate includes the transmitter including a patch antenna and the transmission beam adjustor including a switching element capable of changing a phase of a radiation signal of the patch antenna by 0 degree or 180 degrees,
a second main layer under the first main layer of the multi-layer substrate includes the signal source virtual beam adjustor including a fixed phase shift section including a delay line, and
a ground layer under the second main layer of the multi-layer substrate includes the receiver including a slot antenna array.
10. The antenna apparatus of claim 1 , wherein the signal source virtual beam adjustor configured to shift the phase of each signal 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 transmission antennas when the first signal is transmitted from the one point.
11. The antenna apparatus of claim 1 , wherein the N transmission antennas are arranged in a plane at uniform distances, and
the signal source virtual beam adjustor configured to shift the phase of each signal 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 transmission antennas when the first signal is transmitted from a point that is away from a center of the plane by a certain distance in a direction perpendicular to the plane.
12. The antenna apparatus of claim 1 , wherein each value at which the signal source virtual beam adjustor shifts a phase of each signal included in the second signal is a fixed value.
13. The antenna apparatus of claim 12 , wherein the signal source virtual beam adjustor shifts a phase of each signal included in the second signal by a fixed value via a delay line.
14. The antenna apparatus of claim 13 , wherein a length difference among delay lines with respect to the signals included in the second signal is limited to be within a wavelength.
15. The antenna apparatus of claim 1 , wherein the transmission beam adjustor determines a phase shift value of 0 degree or 180 degrees to be applied to each signal, according to a phase shift value of each signal for adjusting a transmission beam under an assumption that the signals included in the third signal have the same phase.
16. The antenna apparatus of claim 1 , wherein the transmission beam adjustor determines a phase shift value of 0 degree or 180 degrees to be applied to each signal, according to a value obtained by adding a phase shift value of each signal in the signal source virtual beam adjustor to a phase shift value of each signal for adjusting a transmission beam under an assumption that the signals included in the third signal have the same phase.
17. The antenna apparatus of claim 1 , wherein the transmission beam adjustor determines a phase shift value of 0 degree or 180 degrees to be applied to each signal, according to a value obtained by subtracting a phase shift value of each signal in the signal source virtual beam adjustor from a phase shift value of each signal for adjusting a transmission beam under an assumption that the signals included in the third signal have the same phase.
18. The antenna apparatus of claim 1 , wherein each of the N transmission antennas is in a form of a rectangular patch having diagonally chamfered edges so that a transmission signal is circularly polarized.
19. An antenna apparatus comprising:
a receiver comprising N signal receivers;
a signal source virtual beam adjustor configured to shift a phase of each of N signals received by the N signal receivers to have a virtual focus at one point;
a transmission beam adjustor configured to shift a phase of each of the N signals that are phase-shifted by the signal source virtual beam adjustor, by 0 degree or 180 degrees; and
a transmitter comprising N transmission antennas respectively transmitting the N signals that are phase-shifted by the transmission beam adjustor.
20. The antenna apparatus of claim 19 , wherein, when a same first signal is received by the N signal receivers, the signal source virtual beam adjustor shifts the phase of each of the N signals received by the N signal receivers so that the phase of each of the N signals that are phase-shifted by the signal source virtual beam adjustor is equal to a phase of the first signal that would reach each of the N transmission antennas arranged in a plane when the first signal is transmitted from the one point.