Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Abstract

Abstract-A novel frequency reconfigurable 4G Multiple-Input Multiple-Output (MIMO) handset antenna is presented and verified with experimental results. Frequency tuning is used to minimize the antenna volume and to compensate for the losses related to user-originated impedance detuning. Both antenna elements are independently frequency reconfigurable and can cover most of the LTE-A bands. The study compares the losses of CMOS-and MEMS-based digitally tunable capacitors (DTC). In addition, two prototypes with total antenna volumes of 1170 and 3900 mm 3 have been studied. The results show that the larger antenna structure operates with an efficiency better than 49% across the frequencies of 698-960 MHz and better than 56% across the frequencies of 1430-2690 MHz, when a MEMS-based DTC is used. In addition, a new method is introduced to estimate the suitability of the antenna geometry for frequency tunable antennas.

Carrier Aggregation Compatible Mimo Antenna for Lte Handset

“…With the proposed antenna design, the simulated and measured multiplexing efficiencies are approximately −2 to −3 dB and −4 dB, respectively at HB. The obtainedη mux values are comparable to or even better than those achieved in [24], especially at LB.…”

“…The efficiency performances of the proposed main and diversity antennas can be compared to some of the MIMO handset antennas presented in recent literature [7,8,23,24]. For the four-element MIMO design given in [7], the measured efficiency is from −2.2 to −4 dB at the low band, but no HB results are given.…”

“…Examples of MIMO antennas with tunable matching circuits are given in, e.g., [8,24]. The twoelement design of [8] achieves an efficiency of −1.5 to −4 dB at both LB and HB.…”

“…However, as mentioned previously, the LB starts only from the 800-MHz range, meaning that the most challenging LTE LB frequencies are missing even with tuning. In [24], identical main and diversity antennas with a digitallytunable capacitor (DTC) are used in the same end of the device. With this approach, the efficiency is better than −3 dB at LB and HB, but one drawback is the need for a tunable matching circuit.…”

Frequency Reconfigurable Multiband Handset Antenna Based on a Multichannel Transceiver

“…Instead of covering all the channels simultaneously, the antenna can be tuned to a specific channel, thus relaxing the bandwidth requirements of the antenna. Approaches for antenna tuning include tunable matching components [7]- [9], switching between multiple matching circuit networks [10] or using, e.g., p-i-n diodes [11], [12] or FET switches [13] to modify the currents in the antenna. The last option is also known as aperture tuning.…”