Abstract
A wideband grid dipole with low passive intermodulation (PIM) distortion, low profile, and low cost is proposed for multi-input multi-output (MIMO) cellular base station applications. The proposed dipole with a high ratio of unbalanced to balanced current can be achieved by introducing a circular loop at the center of a dipole arm to suppress the unwanted current traveling from the dipole arm to outer coaxial shield. As a result, the profile can be reduced from 0.25λ 0to 0.19 λ 0 due to a 6-dB improvement in PIM performance. The third-order PIM distortion <-151 dBc (at 2 × 43 dBm carriers) is obtained over the operating bandwidth. The 14-dB impedance bandwidth is 43% over the frequency range of 639-989 MHz.
| Original language | English |
|---|---|
| Pages (from-to) | 2369-2374 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Antennas and Propagation |
| Volume | 73 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2025 |
Keywords
- 5G
- balanced dipole
- balun
- cellular base station antenna
- crossed dipole
- dual polarized
- dual slant
- high balance ratio
- interference
- low passive intermodulation (PIM)
- low-cost
- low-profile
- multi-input multi-output (MIMO)
- nonlinear
- PIM
- reverse treated electrodeposited copper foil
- third-order intermodulation
- unbalanced dipole
- wideband antenna
- ± 45A °
- λ/4