Dispersion compensation in mm-wave communication over plastic waveguide using composite right/left-handed metamaterial assembly
A millimeter-wave communication device includes a coupler, Radio-Frequency (RF) circuitry and a composite right/left-handed metamaterial assembly. The coupler is configured to connect to a waveguide, the waveguide being transmissive at millimeter-wave frequencies and having a given dispersion characteristic over a predefined band of the millimeter-wave frequencies. The RF circuitry is configured to transmit a millimeter-wave signal into the waveguide via the coupler, or to receive a millimeter-wave signal from the waveguide via the coupler, and to process the millimeter-wave signal. The composite right/left-handed metamaterial assembly is formed to apply to the millimeter-wave signal, or to an Intermediate-Frequency (IF) signal corresponding to the millimeter-wave signal, a dispersion compensation that compensates for at least part of the dispersion characteristic of the waveguide over the predefined band.
1. A millimeter-wave communication device, comprising:
a coupler, configured to connect to a waveguide, the waveguide being transmissive at millimeter-wave frequencies and having a given dispersion characteristic over a predefined band of the millimeter-wave frequencies;
Radio-Frequency (RF) circuitry that is configured to transmit a millimeter-wave signal into the waveguide via the coupler, or to receive a millimeter-wave signal from the waveguide via the coupler, and to process the millimeter-wave signal; and
a composite right/left-handed metamaterial assembly, which is formed to apply to the millimeter-wave signal, or to an Intermediate-Frequency (IF) signal corresponding to the millimeter-wave signal, a dispersion compensation that compensates for at least part of the dispersion characteristic of the waveguide over the predefined band,
wherein the composite right/left-handed metamaterial assembly comprises (i) multiple capacitors, (ii) multiple inductors, and (iii) two or more switches configured to select a setting of the dispersion compensation from among multiple predefined settings of the dispersion compensation, by selectably connecting and disconnecting selected ones of the capacitors and the inductors.
2. The millimeter-wave communication device according to claim 1 , wherein the composite right/left-handed metamaterial assembly comprises a cascade of multiple transmission-line unit cells, each unit cell comprising (i) a series capacitance and a series inductance, and (ii) a shunt capacitance in parallel to a shunt inductance.
3. The millimeter-wave communication device according to claim 1 , wherein the dispersion characteristic of the waveguide exhibits a group-delay that increases with frequency over the predefined band of the millimeter-wave signal, and wherein the composite right/left-handed metamaterial assembly exhibits a group-delay that decreases with frequency over the predefined band.
4. The millimeter-wave communication device according to claim 1 , wherein the RF circuitry is configured to transmit the millimeter-wave signal into the waveguide, and wherein the composite right/left-handed metamaterial assembly is configured to compensate for the at least part of the dispersion characteristic by pre-distorting the millimeter-wave signal prior to transmission into the waveguide.
5. The millimeter-wave communication device according to claim 1 , wherein the RF circuitry is configured to receive the millimeter-wave signal from the waveguide, and wherein the composite right/left-handed metamaterial assembly is configured to compensate for the at least part of the dispersion characteristic by applying the dispersion compensation to the millimeter-wave signal received from the waveguide.
6. The millimeter-wave communication device according to claim 1 , wherein the RF circuitry and the composite right/left-handed metamaterial assembly are integrated in a same semiconductor chip.
7. The millimeter-wave communication device according to claim 1 , further comprising digital baseband circuitry, wherein the digital baseband circuitry and the composite right/left-handed metamaterial assembly are integrated in a same semiconductor chip.
8. The millimeter-wave communication device according to claim 1 , further comprising digital baseband circuitry, wherein the digital baseband circuitry, the RF circuitry and the composite right/left-handed metamaterial assembly are packaged in a same device package.
9. The millimeter-wave communication device according to claim 8 , wherein the digital baseband circuitry, the RF circuitry and the composite right/left-handed metamaterial assembly are mounted on a same substrate in the same device package.
10. The millimeter-wave communication device according to claim 1 , further comprising digital baseband circuitry configured to identify, from among the multiple predefined settings, a setting that best compensates for the dispersion characteristic of the waveguide, and to set the switches of the composite right/left-handed metamaterial assembly to the identified setting.
11. The millimeter-wave communication device according to claim 1 , wherein the multiple capacitors and the multiple inductors are arranged in multiple cascades of transmission-line unit cells, and wherein the switches are configured to select the setting of the dispersion compensation by selecting one of the cascades.
12. The millimeter-wave communication device according to claim 1 , wherein at least some of the multiple capacitors are series capacitors, wherein at least some of the inductors are shunt inductors, and wherein the switches are configured to select the setting of the dispersion compensation by selectably connecting and disconnecting selected ones of the series capacitors and the shunt inductors.
13. The millimeter-wave communication device according to claim 10 , wherein the digital baseband circuitry is configured to identify the setting that best compensates for the dispersion characteristic of the waveguide, by evaluating a Bit Error Rate (BER) or an Error Vector Magnitude (EVM) of a signal transmitted via the waveguide.
14. A method for millimeter-wave communication, comprising:
transmitting a millimeter-wave signal into, or receiving a millimeter-wave signal from, a waveguide, the waveguide being transmissive at millimeter-wave frequencies and having a given dispersion characteristic over a predefined band of the millimeter-wave frequencies; and
using a composite right/left-handed metamaterial assembly comprising multiple capacitors and multiple inductors, applying to the millimeter-wave signal, or to an Intermediate-Frequency (IF) signal corresponding to the millimeter-wave signal, a dispersion compensation that compensates for at least part of the given dispersion characteristic of the waveguide over the predefined band, including selecting a setting of the dispersion compensation from among multiple predefined settings of the dispersion compensation, by selectably connecting and disconnecting selected ones of the capacitors and the inductors.
15. The method according to claim 14 , wherein applying the dispersion compensation comprises passing the millimeter-wave signal, or the IF signal, through a cascade of multiple transmission-line unit cells, each unit cell comprising (i) a series capacitance and a series inductance, and (ii) a shunt capacitance in parallel to a shunt inductance.
16. The method according to claim 14 , wherein the dispersion characteristic of the waveguide exhibits a group-delay that increases with frequency over the predefined band of the millimeter-wave signal, and wherein applying the dispersion compensation comprises applying, by the composite right/left-handed metamaterial assembly, a group-delay that decreases with frequency over the predefined band.
17. The method according to claim 14 , wherein applying the dispersion compensation comprises pre-distorting the millimeter-wave signal prior to transmission into the waveguide.
18. The method according to claim 14 , wherein applying the dispersion compensation comprises applying the dispersion compensation to the millimeter-wave signal received from the waveguide.
19. The method according to claim 14 , wherein selecting the setting comprises identifying, from among the multiple predefined settings, a setting that best compensates for the dispersion characteristic of the waveguide, and connecting and disconnecting the selected ones of the capacitors and the inductors to set the composite right/left-handed metamaterial assembly to the identified setting.
20. A millimeter-wave communication system, comprising:
a first communication device, configured to transmit a millimeter-wave signal into a waveguide, the waveguide being transmissive at millimeter-wave frequencies and having a given dispersion characteristic over a predefined band of the millimeter-wave frequencies; and
a second communication device, configured to receive the millimeter-wave signal from the waveguide and to process the received millimeter-wave signal,
wherein at least one of the first communication device and the second communication device comprises a composite right/left-handed metamaterial assembly, which is formed to apply to the millimeter-wave signal, or to an Intermediate-Frequency (IF) signal corresponding to the millimeter-wave signal, a dispersion compensation that compensates for at least part of the dispersion characteristic of the waveguide over the predefined band,
and wherein the composite right/left-handed metamaterial assembly comprises (i) multiple capacitors, (ii) multiple inductors, and (iii) two or more switches configured to select a setting of the dispersion compensation from among multiple predefined settings of the dispersion compensation, by selectably connecting and disconnecting selected ones of the capacitors and the inductors.