Simple Triple-Mode Dual-Polarized Dipole Antenna With Small Frequency Separation Ratio

Abstract

A triple-mode dual-polarized dipole antenna topology with a very small frequency separation ratio is proposed. The antenna has a simple structure with a very low manufacturing cost, while maintaining a good performance. A conventional dipole is fed by a feeding network also acting as a radiator to generate a second resonant mode. A shorted conductor loaded to the dipole is used to excite a third resonant mode. It is shown that the three modes can be tuned in order to cover different sets of applications. By fusing the two higher resonances, an antenna with a lower band and a very wide higher band can be obtained. Two orthogonal linear polarizations are achieved by integrating two of the aforementioned topologies. The conceptual structure is prototyped and measured. The realized antenna has a lower band of 2.38-2.54 GHz and a higher band of 3.11-4.15 GHz. Its electrical size is 0.8×0.8 λ 2 , with a profile of 0.27 λ (λ is the wavelength in free space at 2.4 GHz). The mutual coupling between the two ports is below -20 dB, which is quite beneficial for the diversity performance in MIMO systems.

3-D twelve-port multi-service diversity antenna for automotive communications

“…The antennas in 7 , 33 , 35 , 47 occupied an equivalent/smaller area but had fewer elements. The proposed MIMO antenna outperforms in terms of ECC, DG, MEG, TARC, and CCL, whereas all of these diversity factors were not investigated in the majority of reported papers 14 , 20 , 33 – 38 , 40 , 41 , 43 – 45 , 47 , 49 , 51 – 55 , 58 , 59 . The housing effect and on-car body performance of the proposed 3-D MIMO antenna are investigated, whereas they were previously studied only for single-element/two-element/2-D MIMO antenna designs 1 , 31 , 32 , 45 , 55 .…”

“…3. Unlike the antenna structures reported in 14,20,34,[36][37][38][39][40][41][42][43][44][45][46][47][48][50][51][52][53][54][55][56][57][58][59] , the proposed MIMO antenna configuration occupies less area while having a larger number of resonating elements. The antennas in 7,33,35,47 occupied an equivalent/ smaller area but had fewer elements.…”

“…4. The proposed MIMO antenna outperforms in terms of ECC, DG, MEG, TARC, and CCL, whereas all of these diversity factors were not investigated in the majority of reported papers 14,20,[33][34][35][36][37][38]40,41,[43][44][45]47,49,[51][52][53][54][55]58,59 . 5.…”

Dual-Band Dual-Polarized Massive MIMO Array for Maritime Applications

“…The required bands are 5.1 and 5.9 GHz which are authorized by the Norwegian government for testing. A dual-band antenna array rather than a wideband antenna array is more desired, since using a single wideband antenna to cover the separated required bands may introduce unwanted signals in the receiver [12]. The schematic view and the prototype of the antenna element are given in Fig.…”

Bandwidth and gain enhancement of triple‐band MIMO antenna incorporating metasurface‐based reflector for WLAN/WiMAX applications

“…There are different methods to lower down the mutual coupling in MIMO antennas such as DGS loadings [6], neutralisation lines [7, 8], split‐ring resonator loadings [9, 10], parasitic configuration loading [11], antennas with multilayer configurations [12, 13], frequency selective surfaces [14, 15], electromagnetic bandgap structures [16], and substrate integrated waveguide [17]. Also, the gain and bandwidth of the MIMO antennas are enhanced by artificial magnetic conductor loadings [18, 19], Fabry Perot metamaterial (MTM) superstrates [20], multilayer metasurface (MS)‐based superstrate [21], MTM inspired hexagonal ring based superstrate [22], epsilon and Mu near to zero MTM superstrates [23], MTM‐based superstrate [24], crossed‐dipole antenna with a small frequency separation ratio applicable for MIMO systems [25], crossed dual‐polarised and dual‐band bowtie dipole antenna combined with an AMC‐based reflector [26], dual‐band MIMO slot antenna with dual‐band AMC loadings [27], and dual‐band MIMO based four‐port array antenna with filtering structures [28]. The above‐explained multilayer antenna designs acquire higher antenna dimensions and larger antenna profile with more design complexity.…”