- 4x4 channel matrix was recorded as a function of time over multiple 1.9 second intervals.
- The system simultaneously transmits 2 tones at 4 MHz spacing
- H matrix were normalized to eliminate antenna gain differences and focus on gains due to array configurations instead.
Parameter |
Value |
| Carrier Frequency |
2.48 GHz or 2.40 GHz |
| Bandwidth |
4 MHz (2 tones at 4 MHz spacing) |
| Transmit Power |
2W per Channel |
| Record Length |
1.9 s |
| Excitation Time |
10 µs |
| Excitation Spacing |
3.2 ms |
- In most locations MTM has higher bits/sec/Hz compared to Monopole with higher antenna separation
- Over all, compact MTM Tx and Rx performed better than MP Tx configurations
- Couldn't measure with MTM Tx and MTM Rx @ λ/8 because of Freq. Tuning
| Test Conf. |
Tx |
Rx |
Loc. 1
bits/sec/Hz |
Loc. 2
bits/sec/Hz |
Loc. 3
bits/sec/Hz |
Loc. 4
bits/sec/Hz |
Loc. 5
bits/sec/Hz |
Loc. 6
bits/sec/Hz |
| A |
MP λ/2 |
MP λ/2 |
9.8946 |
10.6714 |
10.3777 |
7.8385 |
9.4432 |
9.1549 |
| B |
MP λ/2 |
MP λ/4 |
10.0130 |
10.4674 |
10.2508 |
8.7181 |
7.7124 |
8.9112 |
| C |
MP λ/2 |
MP λ/6 |
9.2474 |
9.7783 |
10.4548 |
7.5176 |
7.8453 |
8.9023 |
| E |
MP λ/2 |
MTM λ/4 |
9.6351 |
10.0065 |
9.7665 |
8.2544 |
10.1055 |
10.6015 |
| F |
MP λ/2 |
MTM λ/6 |
9.6085 |
9.3649 |
9.9582 |
8.2800 |
9.56109 |
10.3154 |
| G |
MP λ/2 |
MTM λ/8 |
9.8841 |
9.9486 |
9.7802 |
8.1282 |
10.5910 |
10.2697 |
| H |
MTM λ/4 |
MTM λ/6 |
10.3382 |
10.2995 |
10.1547 |
8.7787 |
9.0809 |
10.7628 |
MP: Monopole
MTM: Metamaterial |
- MetarrayTM antennas are superior to monopole in seeing near-orthogonal channels (optimal MIMO case).
- In rich multipath environment (strong MIMO channels), MetarrayTM provides better performance than an array of monopole spaced half a wavelength apart.
- In weaker MIMO channels, the overall diversity provided by MetarrayTM drastically improves the combined channel gain.
Total MIMO Gain = Antenna Gain + Array Gain
| Features |
Conventional |
MTM |
| Size |
Large |
Small |
| Array Size |
Large |
Small |
| Integration |
Complex/Expensive |
Simple/Low Cost |
| Ant. Gain |
High |
Average |
| Array Gain |
Average |
High |
|
