Carrier Aggregation Compatible Mimo Antenna for Lte Handset

Abstract

Abstract-This paper proposes a two-element LTE MIMO handset antenna with physically different main and diversity antennas. The performance of the design is studied theoretically and experimentally. The investigated design utilises physically different main and diversity antennas to improve especially the low-band MIMO performance. A Combined Parasitic-coupled, Aperture-Matched (CPAM) antenna is used as the main antenna, and the diversity antenna is a simple Capacitive Coupling Element (CCE) design. The antenna covers the LTE bands from 698-960 MHz and 1710-2690 MHz with fixed matching circuits suitable for low-band (LB) Carrier Aggregation (CA). Measured total efficiency of the antennas is from −3 to −6 dB and −2 to −5 dB at the low and high bands, respectively. In the MIMO case, envelope correlation coefficient (ECC) and multiplexing efficiency (η mux ) are studied also from measurements.

Cross Polarized 2×2 Uwb-Mimo Antenna System for 5g Wireless Applications

“…As the two radiators are identical with similar ground planes (S 11 is similar to S 22 ), Figure 7 only shows S 11 and S 21 . The bandwidth of impedance provided by the antenna under discussion is 10 GHz (2 GHz-12 GHz), with an isolation of −10 dB throughout the operating band, which is well accepted for a standard MIMO system [24,25]. As clear from both Figures 8 and 9, the designed antenna system elements show nearly omnidirectional radiation pattern pertaining to the whole frequency range.…”

MIMO Performance of Today's Metal-covered Handset

“…At HB, where ECC is basically negligible, we see similar difference between simulations and measurements that is with total efficiencies. Comparing our design with [2], [5], the multiplexing efficiencies are very similar in the LB and HB. In our design that is mainly between −8 to −4 dB.…”

On the Operating Principle of an LTE Handset Antenna with Multiple Closely-Located Radiators

“…With this concept, it is possible to achieve instantaneous coverage of the LTE low band (698-960 MHz) with passive matching circuits, which makes this approach CA compatible. However, the fundamental, underlying mechanisms behind the operation of the CPAM antenna are not analysed in detail in [4], [5]. The current investigation extends the work of [4] by considering the individual contribution of the parasitic elements and aperture matching on the overall antenna performance at the low and high bands (LB and HB, respectively).…”

“…The mutual coupling can occur between adjacent antennas or between different feeds connected to the same antenna [2], [3]. Recent works have shown designs that use combinations of closely-located fed, aperture-matched, and fully parasitic radiators in various configurations [4], [5]. This kind of design is also referred to as a Combined Parasitic-coupled, Aperture-Matched (CPAM) antenna [5].…”

“…Recent works have shown designs that use combinations of closely-located fed, aperture-matched, and fully parasitic radiators in various configurations [4], [5]. This kind of design is also referred to as a Combined Parasitic-coupled, Aperture-Matched (CPAM) antenna [5]. With this concept, it is possible to achieve instantaneous coverage of the LTE low band (698-960 MHz) with passive matching circuits, which makes this approach CA compatible.…”