Gert F. Pedersen

Multi-layer 5G mobile phone antenna for multi-user MIMO communications

In this study, a new design of multi-layer phased array antenna for millimeter-wave (mm-Wave) fifth generation (5G) mobile terminals is proposed. The proposed linear phased array antenna is designed on four layers of the Rogers RT5880 substrates to operate at 28 GHz which is under consideration for 5G wireless communications. Two identical linear sub arrays can be simultaneously used at different sides of the mobile-phone printed circuit board (PCB) for operation in diversity or multiple-input multiple-output (MIMO) modes. Each sub array contains eight elements of very compact off-center dipole antennas with dimensions of 5.4×0.65 mm2. The feature of compact design with good beam-steering function makes them well-suited to integrate into the mobile-phone mock-up. The fundamental properties of the proposed antenna have been investigated. Simulations show that the proposed 5G antenna is effective for the required beam-coverage in multi-user MIMO communications.

Design of Vivaldi antenna array with end-fire beam steering function for 5G mobile terminals

This manuscript proposes a new design of phased array antenna for future fifth generation (5G) cellular communications. The proposed phased array antenna is designed on a low-cost N9000 PTFE substrate with overall size of 60×130×0.8 mm3. It consists of eight 28-GHz Vivaldi antenna elements used to form a linear phased array in the edge region (top-side) on a mobile phone PCB. The simulated results show that the antenna has the reflection coefficient (S11) less than -10 dB in the frequency range of 27.4 to 28.6 GHz. The proposed phased array antenna has good gain, efficiency, and 3D beam steering characteristics in the entire operation band, which makes it suitable for millimeter-wave 5G communications. In addition, the performance of the antenna in the vicinity of users hand has been investigated in this study.

Compact multiband sensing MIMO antenna array for cognitive radio system

This paper presents a new design for a multiband sensing MIMO antenna system that can be used in cognitive radio communication for a mobile platform. The antenna system consists of two identical small-size multiband antennas with dimensions 29.5 × 17 × 5 mm3 and each of them is comprised of a driven strip monopole and a coupled parasitic shorted strip. These antennas are located diagonally to limit the mutual coupling and antenna correlation at low frequencies. The obtained operating bands are 698-990 MHz and 1710-5530 MHz, which include most of the LTE and Wi-Fi frequency bands. A prototype was fabricated and the measured results indicate that the realized efficiency is acceptable for a mobile application considering the compact size.

Performance Investigation of a Mobile Terminal Phased Array With User Effects at 3.5 GHz for LTE Advanced

This letter discusses the performance investigation of a beam-steerable antenna system at 3.5 GHz with user effects. To show how to investigate the performance of such a system, an antenna array system in a metal frame structure is used as one example. The antenna system includes four phased subarrays. Each subarray consists of two slot antenna elements. In the application, it is possible to control the beam by phase in each subarray and switch the main beam direction among the four phased subarrays, depending on the incoming power and interference directions. The main idea in this letter is to evaluate the performance of the phased array system by using the metrics of total scan pattern and coverage efficiency with CTIA standards. The proposed antenna system is simulated and measured in free space and with user effects. Losses in both scan angles and coverage efficiency due to the user effects are also given and discussed in this letter.

Low-cost planar MM-wave phased array antenna for use in mobile satellite (MSAT) platforms

In this paper, a compact 8×8 phased array antenna for mobile satellite (MSAT) devices is designed and investigated. 64-elements of 22 GHz patch antennas with coaxial-probe feeds have been used for the proposed planar design. The antenna is designed on a low-cost FR4 substrate with thickness, dielectric constant, and loss tangent of 0.8 mm, 4.3, and 0.025, respectively. The antenna exhibits good performance in terms of impedance-matching, gain and efficiency characteristics, even though it is designed using high loss substrate with compact dimension (Wsub×Lsub=55×55 mm2). The antenna has more than 23 dB realized gain and -0.8 dB radiation efficiency when its beam is tilted to 0° elevation. The center frequency of the designed array can be controlled by adjusting the values of the antenna parameters. Compared with the previous designs, the proposed planar phased array has the advantages of simple configuration, low-cost, low-profile, and easy fabrication. Simulations have been done to validate the feasibility of the proposed phased array antenna for MSAT applications.