A novel UWB slot antenna with reconfigurable rejection bands

Abstract

Abstract:A coplanar waveguide (CPW) fed Ultra Wideband (UWB) slot antenna with reconfigurable rejection bands is presented. Specific band of the rejection is achieved by placing switching diodes over the rectangular slot in the ground plane at a position of effective length of λ/2 for the center frequency of the rejection band. The rejection of WiMax, IEEE 802.11a and HYPERLAN/2 bands can be achieved by switching the diodes. The simple configuration and low profile of the proposed antenna leads to easy fabrication that may be used in any wireless UWB device applications where reconfigurable rejection bands are required.

Ultra‐wideband slot antenna with a stop‐band notch

“…8, the 4.5 GHz radiation pattern has a slight degrading comparing with the 9 GHz radiation patterns. This discrepancy between measured and expected results is mostly because of a number of parameters such as the fabricated antenna dimensions as well as the thickness and dielectric constant of the substrate on which the antenna is fabricated, the wide range of simulation frequencies and also the effect of, sub miniature version A (SMA) connector, because in the practice the effect of the coaxial cable which is connected to the SMA at the input of the antenna is considerable, especially the additional inductance which is produced by the length of its inner conductor, is not negligible [18, 19]. To confirm the accurate return loss characteristics for the designed antenna, it is recommended that the manufacturing and measurement process need to be performed carefully, besides, SMA soldering accuracy and FR4 substrate quality needs to be taken into consideration.…”

Wideband frequency reconfigurable antenna array

“…To achieve this performance, many frequency reconfigurable antennas [1,2,3,4,5,6,7,8] and reconfigurable frequency selective surfaces [9,10] with wide tuning ratio were published. They can use switching components such as PIN diodes, varactor diodes, and microelectromechanical systems (MEMS) to provide multi-band operation more easily.…”

Novel design of reconfigurable microstrip slot antenna with switchable band‐notched characteristic

“…To effectively and fully utilize the UWB spectrum and to improve the performance of the UWB system, it is desirable to design the UWB antenna with reconfigurable notch band to isolate and block any interference between the systems. In Ref.…”

“…In Ref. , for reconfigurable performance of rejection band which is between 5 and 6 GHz, RF microelectronic mechanical system (MEMS) is utilized while in diodes are used for the same reason. That demands the use of “smart” reconfigurable antennas capable of cancelling in‐band interference.…”