Mechanically Reconfigurable, Dual-Band Slot Dipole Antennas

Abstract

Range-angle-dependent beamforming by frequency diverse array antenna," Int.Abstract-Mechanically reconfigurable dual-band slot dipole antennas with wide tuning ranges are developed in this communication. The dualband operation is achieved by inserting parallel slots with different lengths and the tuning is realized by incorporating a dual rack and pinion mechanism to slide parasitic patches to vary the slot lengths and the frequency of operation of each band. To demonstrate the proposed approach, two frequency-tunable antennas are prototyped. The first design uses two motors to tune the frequency band ratio between 1 and 2.6. The second design uses one motor to maintain a constant frequency band ratio of 2 over the tuning range of 2-3 GHz for the lower band and 4-6 GHz for the upper band. Both designs show minimal variation in gain, polarization, and radiation pattern over the tuning range.Index Terms-Dual-band antenna, frequency tunable, reconfigurable antenna, slot antenna.

Design of Integrated Duplexing and Multi-Band Filtering Slot Antennas

“…However, the main challenge in designing multi-band antennas under one radiation element is how to maintain the stability of radiation patterns at the same time [18]. For slot antennas, the method to obtain multi-band function is various including stepped impedance slot [19], stair-shaped slot [20], multi-branch slot [21], [22], comb-like slot [23] and H-shaped slot [24]. Additionally, slot antennas with multi-resonant modes are not only suitable to improve the impedance bandwidth [25], but also have great potential to design multi-band antennas [26].…”

Mechanically pattern reconfigurable dual‐band antenna with omnidirectional/directional pattern for 2.4/5GHz WLAN application

“…Reconfigurable antennas provide a solution. There are some reconfigurable techniques, that is, the electrical reconfiguration using the PIN diodes or varactors, using the tunable materials such as liquid crystal and mechanically reconfiguration . However, the efficiencies of the reconfigurable antennas using the electronic devices are usually low, compared to that of the mechanically reconfigurable antenna.…”

“…There are some reconfigurable techniques, that is, the electrical reconfiguration using the PIN diodes or varactors, using the tunable materials such as liquid crystal and mechanically reconfiguration. [2][3][4][5][6][7][8][9][10][11] However, the efficiencies of the reconfigurable antennas using the electronic devices are usually low, compared to that of the mechanically reconfigurable antenna. Another solution is using two or more feed port to generate different radiation patterns, 12 which is not compatible with the single port system.…”

Dual‐band antenna with combination of printed dipole and aperture coupled rectangular patch antenna

“…Also, a dual‐band omnidirectional antennas with an omnidirectional radiation are most popular for covering all sides. For that reason, there are many studies about dual‐band antenna . Dipole antennas are the best choice for the good omnidirectional pattern and dual‐band applications, thus efforts have been done on the dipole antenna to make dual‐band and several techniques have been used to achieve dual‐band omnidirectional antenna .…”

“…Recently, a technique has been presented in Ref. [ ], using separate motors to slide parasitic patches over each slot pair, but besides its complex structure and large size, fabrication of this antenna is very complicated.…”