Two Asymmetrically Mirrored Gap-Coupled Loop Antennas as a Compact Building Block for Eight-Antenna MIMO Array in the Future Smartphone

Self Cite

Conjoined dual antennas with an ultra‐wideband (UWB) of 2300‐6000 MHz for multi‐input multi‐output operation in the fifth‐generation (5G) tablet device is presented. The UWB covers not only the 5G band in 3300‐5000 MHz, but also the long term evolution high band in 2300‐2400/2500‐2690 MHz and the Wireless Fidelity band in 2400‐2500/5100‐5900 MHz. Additionally, the envelope correlation coefficient in the UWB is less than 0.1. The conjoined dual antennas have a planar printed structure and require only 32.2 mm (about 0.25‐wavelength at 2.3 GHz) along the edge of the device ground plane. The dual antennas share a conjoined section of a ring strip for bandwidth enhancement and a band‐pass resonant structure for effective decoupling. The band‐pass resonant structure is formed by a printed structure of distributed capacitor and inductor connected in series. Details of the conjoined UWB dual antennas are presented.

Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Conjoined ultra‐wideband (2,300‐6,000 MHz) dual antennas for LTE HB/WiFi/5G multi‐input multi‐output operation in the fifth‐generation tablet device

Chen

2019

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“…The simulated ECCs (HFSS) are also shown for comparison. Although there are some discrepancies between the calculated and simulated ECCs, the ECCs are all <0.1 in the LTE M/HB, which is good for practical MIMO applications …”

Section: Resultsmentioning

confidence: 81%

“…Feed 2 and feed 3 are the feed networks to respectively excite Ant2 and Ant3. Feed 2 is mainly a radiating feed monopole of length 25.4 mm (strip D″H 2 , see Figure ) to generate a resonant mode at about 2.6 GHz and additionally to capacitively couple to frame DF (length 15.5 mm) to generate a quarter‐wavelength loop resonant mode at about 1.8 GHz . The two modes are combined to cover the desired LTE M/HB in 1710–2690 MHz.…”

Section: Proposed Metal‐frame Lte Mimo Antennasmentioning

confidence: 99%

One LTE LB and two conjoined LTE M/HB MIMO antennas with a compact symmetric frame structure at the short edge of the metal‐framed smartphone

Lin

Barani

2019

Self Cite

The metal‐frame long‐term evolution (LTE) antennas with a compact symmetric frame structure at the short edge of the metal‐framed smartphone are presented. The proposed metal‐frame antennas cover the LTE low band (LB) in 824~960 MHz and two LTE middle/high bands (M/HBs) in 1710~2690 MHz. The LTE LB antenna uses a short metal‐frame section of 41.8 mm (about 0.12 wavelength at 824 MHz). The two LTE M/HB antennas together use a continuous metal‐frame section of 41.8 mm (about 0.24 wavelength at 1710 MHz), same as the LTE LB antenna. The two LTE M/HB antennas show low envelope correlation coefficient (ECC) of <0.1 in 1710~2690 MHz, owing to using a capacitor‐loaded shorting strip for the two antennas conjoined to achieve a compact and decoupled structure. The low ECC allows the two LTE M/HB antennas to be promising for 2 × 2 multi‐input multi‐output operation.

“…Figure shows the calculated channel capacity of the fabricated dual‐feed U‐slot antenna in a 2 × 2 MIMO system with Rayleigh multipath environment and 20‐dB signal‐to‐noise ratio (SNR) at the receiver side . The results are calculated from the measured antenna efficiencies and calculated ECCs from the measured radiation patterns that are shown in Figures and .…”

Section: Resultsmentioning

confidence: 99%

Dual‐feed U‐slot antenna having low envelope correlation coefficients for the LTE MIMO operation in the metal‐framed smartphone

Barani

2018

Self Cite

A printed dual‐feed U‐shaped open‐slot (U‐slot) antenna disposed close to the top or bottom short edge of the system ground plane in the metal‐framed smartphone for the LTE (long‐term evolution) MIMO (multi‐input multi‐output) operation is presented. The U‐slot is printed in the ground region within 10 mm to the short edge of the system ground plane and its two open ends are disposed at the short edge thereof. The former makes the system ground plane capable of accommodating a large display panel for the smartphone, while the latter decreases the effects of the user's hand holding the smartphone. The U‐slot is short‐circuited at one position therein to provide one longer open slot and one shorter open slot, which are fed separately by two feed networks to form Ant1 and Ant2. Ant1 can cover the LTE low band (LB, 746–960 MHz for Band 13/5/8) and LTE middle/high band (M/HB, 1710–2690 MHz). Ant2 can cover the LTE M/HB in 1710–2690 MHz. In addition, very low envelope correlation coefficients (ECCs) less than 0.1 in the LTE M/HB for Ant1 and Ant2 can be obtained. That is, in addition to the coverage of the LTE LB, the dual‐feed U‐slot antenna can be applied for the 2 × 2 LTE M/HB MIMO operation. The antenna structure and operating principle of the dual‐feed U‐slot antenna are presented, and the antenna performance is verified by the experimental study.