Compact Pattern Reconfigurable Antenna Research Articles

A compact two-state pattern reconfigurable antenna for 5G Sub-6 GHz cellular applications

This paper presents a compact pattern reconfigurable antenna for sub-6 GHz (4.8 GHz-5 GHz) applications. The proposed antenna consists of a quarter-wavelength radiator with two circular slot-loaded oval-shaped patches on both sides of the radiator. The antenna's ground plane is loaded with an inverted l-shaped structure. Two PIN diodes are used to switch the direction of radiation. Good agreement between simulated and measured results is obtained. The −10 dB impedance bandwidth of the proposed design is 370 MHz. The peak gain is 5.5dBi, and efficiency is 82 % in different diode states. The proposed antenna is then analyzed with the Nordic nRF9160 DK board to check the design reliability.

A compact pattern reconfigurable antenna employing shorted quarterwave patch antennas

In this study, a compact pattern reconfigurable antenna structure is proposed. The proposed antenna is a half-wave square microstrip patch antenna divided into two quarter-wave antenna portions by a conducting wall. This wall forces potential zero at the connection point; therefore, it separates the antenna into two independent quarter-wave portions. Pattern reconfiguration is achieved by separate feeding of the quarter-wave portions. Phase difference between excitations of antenna ports result in variation at the maximum beam direction. Hence, pattern reconfiguration is achieved. Within such a compact antenna, beam steering up to 400 is achieved

Pattern Reconfigurable Antenna for Formation Flying Missions

In this paper, an innovative compact pattern reconfigurable antenna is proposed and developed to establish an inter-satellite communication link between the Formation flying spacecraft. The reconfigurable beam switching antenna comprises a driven Monopole at the center, encompassed with four Reconfigurable Selective Reflectors (RSR) which act as RF radiators and reflectors for different switching conditions. PIN diodes are used to electronically control the switch states of RSR and beam switching is achieved with uniform gain along the azimuth plane without affecting the antenna’s overall performance. The peculiar demands of Formation Flying Mission (FFM) satellites such as small size and low power for communication system are resolved by the proposed technique where a single antenna with different patterns communicates with multiple satellites reducing the antenna space and power consumption. Furthermore, it also offers a solution to the problem encountered in existing FFM antenna, like microstrip patch, which serves only one satellite at a time. The antenna is designed at 2.45GHz center frequency. Simulated results show good impedance matching and performance with 13 to 15% bandwidth and wide beamwidth. The experimental validation shows that the simulation results of the antenna agree well with the measured results.

A Multifunctional Compact Pattern Reconfigurable Antenna With Four Radiation Patterns for Sub-GHz IoT Applications

A compact pattern reconfigurable antenna with four radiation patterns is proposed for sub-GHz IoT applications. The antenna has two functional modes; Mode I has three uncorrelated patterns, while Mode II has electric and magnetic omnidirectional patterns. The resonant frequency of the antenna is 868 MHz with measured overlapped −6 dB impedance-bandwidths of 22 MHz and 20 MHz for Mode I and Mode II, respectively. The antenna is integrated in an $80\times 55$ mm2 terminal. The radiating elements consist of two meandered slots and one meandered monopole. Four pattern configurations are obtained with an average peak gain of 0 dBi, and an average radiation efficiency of 43.3%. Two of the patterns are with 5 dB directivity, and the other two are omnidirectional patterns. Pattern reconfigurability is achieved using four PIN diodes. The antenna is fabricated on a low-cost FR-4 substrate. By removing FR-4 material inside the slots, slots’ radiation efficiencies were improved by 2.25 dB.