Hyunho Wi

Closely Mounted Mobile Handset MIMO Antenna for LTE 13 Band Application

A compact (60 × 15 × 5 mm 3) mobile handset multiple-input-multiple-output (MIMO) antenna for LTE 13 band (746-787 MHz) applications is proposed. The antenna consists of two symmetrical planar inverted-F antennas (PIFAs) in conjunction with a T-shaped common radiator. Without using any additional coupling elements between these closely mounted antennas, both high isolation ( > 17 dB) and low envelope correlation coefficient (ECC <; 0.05 ) are achieved. The low ECC is achieved by using diagonally orthogonal radiation patterns from optimized locations of the MIMO antenna feeds and elements. Low mutual coupling achieved by using the T-shaped common radiator gives rise to the high isolation.

Multiband Handset Antenna Analysis Including LTE Band MIMO Service

A compact multiband handset antenna including MIMO antenna operation for LTE 13 band (746 » 787MHz) applications is proposed. The proposed antennas are separately located on the top and bottom portions of a mobile handset in order to use the antenna area more efiectively. The proposed antenna achieves isolations of higher than 14dB, enveloped correlation coe-cients (ECC) of less than 0.25, and total e-ciencies of greater than 40%. The operating frequency bands of Antenna 1 and Antenna 2 include the LTE 13 (746 » 787MHz)/DCS/PCS/UMTS (1710 » 2170MHz) bands and the LTE 13 (746 » 787MHz)/GSM850/900 (824 » 960MHz) bands, respectively.

Closely Mounted Compact Wideband Diversity Antenna for Mobile Phone Applications

Here a compact wideband diversity antenna covering the PCS/UMTS/WiMAX bands with high isolation and low enveloped correlation coefficient (ECC) is proposed. To widen the bandwidth, the proposed antenna uses a structure with a gap-coupled feed and an inductively shorted line that has capacitive compensation between the radiator and the ground plane. Also, a suspended line with a parasitic element is used to enhance the isolation between the two antennas.

Isolation Enhancement of USB Dongle MIMO Antenna in LTE 700 Band Applications

A compact USB dongle multiple-input-multiple-output (MIMO) antenna for Long Term Evolution (LTE) 700 band (704 ~ 746 MHz) applications is proposed. The proposed antenna consists of two symmetrical meander radiators with a capacitively coupled feed. Without the usage of any additional coupling elements between closely mounted antennas, the proposed antenna achieves isolations of higher than 13 dB, enveloped correlation coefficients (ECCs) of less than 0.43, and total efficiencies of higher than 37%.

New Configuration of Handset MIMO Antenna for LTE 700 Band Applications

A compact handset multiple-input multiple-output (MIMO) antenna for long-term evolution (LTE) 700 band (746~787 MHz) applications is proposed. The proposed antenna consists of two symmetrical PIFAs. Without the usage of any additional coupling elements between closely mounted antennas, a high isolation (>15 dB) and a low enveloped correlation coefficient () are achieved by the optimum location and arrangement of MIMO antenna elements.

Multiband LTE MIMO antenna for laptop applications

A slim multi-band LTE MIMO antenna covering the LTE12/LTE13/LTE14/LTE17 bands is proposed and designed for laptop applications. Each MIMO antenna mounted on the vertical side edges of a laptop consists of two PIFAs with a single proximity coupled-feed. The radiation efficiency of the proposed antenna is higher than 60% over the entire LTE band. The isolation between two ports is more than 15 dB, and the correlation coefficient is less than 0.2 over the entire operating LTE band.

A Compact Frequency Reconfigurable Antenna for LTE Mobile Handset Applications

A compact (8 × 62 × 5 mm3; 2.48 cc) frequency reconfigurable antenna that uses electrical switching with PIN diodes is proposed for the low frequency LTE band (699 MHz–862 MHz), high frequency LTE band (2496 MHz–2690 MHz), GSM850/900 bands (824 MHz–960 MHz), and DCS/PCS/WCDMA bands (1710 MHz–2170 MHz). The penta-band PIFA is first designed for GSM850/900/DCS/PCS/WCDMA bands by using two slits and ground pins within a limited antenna volume (8 × 54.6 × 5 mm3; 2.18 cc). The frequency reconfigurable antenna based on this penta-band PIFA is thus proposed to additionally cover all LTE bands. The proposed antenna has two PIN diodes with an optimal location. For State 1 (PIN diode 1: ON state, PIN diode 2: OFF state), the proposed antenna covers the low frequency LTE band, DCS/PCS/WCDMA bands, and high frequency LTE band. For State 2 (PIN diode 1: OFF state, PIN diode 2: ON state), the antenna covers the GSM850/900 bands. Simulated and measured results show that the total efficiency of the proposed antenna was greater than 40% for all operating frequency bands.

Ground Plane With Loop Structure for Reducing User's Hand Effect

A half-wavelength loop structure on the ground plane for mobile handset applications is proposed to mitigate the users hand effect on antenna radiation efficiency. The proposed loop structure makes a major portion of electric field distribution on the ground plane shift away from the users hand. This considerably improves the antenna radiation efficiency compared to an antenna without a loop structure under the influence of the users hand.

Diversity and MIMO antenna for multi-band mobile handset applications

A multi-band antenna, which consists of a diversity antenna in the DCS/PCS/UMTS bands and a MIMO antenna in the LTE17/LTE4 bands, is proposed and designed for mobile handset applications. The proposed antenna consists of the meandered PIFAs with branch lines. The radiation efficiency of the proposed antenna is higher than 30% in the LTE17/LTE4 bands and higher than 40% in the DCS/PCS/UMTS bands. The ECC between two identical antennas is less than 0.5 over the entire LTE17/LTE4/DCS/PCS/ UMTS bands.

Mobi-Kids Study: Exposure Assessment of Electromagnetic Radiation from Mobile Phones I. Analysis on Exposure Types

Four countries are participating in exposure assessment for Mobi-Kids Study. Each country evaluates RF and ELF exposure from mobile phones considering telecommunication system and environment in the corresponding area. The results will be used to determine accumulation exposure level of each subject in case and control groups to assess the potential carcinogenic effects of childhood and adolescent exposure to radio frequency(RF) and extremely low frequency( ELF) from mobile phones on the central nervous system. This paper analyzes exposure types of mobile phones which have been used in Korea for about 10 years, based on Mobi-Kids protocol. It includes investigation of mobile phone models released in the domestic market, design of numerical phone models to represent each exposure type, and measurement of ELF radiation from mobile phones.