Tunable Band-Notched High Selective UWB Filtering Monopole Antenna

Tunable Triple Band-Notched Uwb Antenna Using Single Ebg and Varactor Diode

“…Various techniques are employed in band-notched antennas to produce notches at specific frequency of interest. However, these band notches are achieved by etching slots on radiating elements, using resonators or with multi-parasitic elements around the feed line [7][8][9][10][11][12][13][14][15][16][19][20][21][22][23][24][25][26][27][28][29][30][31]. In order to achieve multiple band-notches, UWB antennas should not only make effective use of the space around the radiating patch but also be able to minimize coupling effects with less parasitic elements near the feed line.…”

“…12(a) and (b), respectively. Previously, various reconfigurable band-notched antennas using more active devices such as capacitors and varactors have been reported in [19][20][21][22][23][24][25][26][27][28][29][30][31]. In [19], open loop resonators (OLRs) are used around the feed line of antenna to produce single band-notch, and the antenna is tuned from 5.1 to 5.9 GHz using two varactors embedded in the OLRs.…”

“…In [28,29], capacitors are embedded within the resonators to tune WLAN band from 5.0 to 6.0 GHz. In [30], triple band notching and tuning are achieved with open ended stubs and three varactors, respectively. In [31], two EBG structures, namely TVEL and fractal, are used to produce dual band notches at WIMAX and WLAN bands, respectively.…”

“…The EBG structures are loaded with two varactor diodes and tuned independently between 2.8-4.0 GHz and 4.7-6.2 GHz. The works reported in [19][20][21][24][25][26][27][28][29][30][31] have either managed to produce tunability with more varactors/capacitors or are able to tune only single notch-band [22,23]. Considering the power supply constraints and biasing circuit's complexity, it is always desirable to design multi-band notch antennas with minimum active devices for continuous tuning.…”

Fully tunable filter‐antenna with microstrip and quarter‐mode substrate‐integrated waveguide hybrid structure

“…For the filter-antenna with adjustable bandwidth, in previous studies, the bandwidth adjustable is the use of discrete bandwidth switching, [7][8][9][10] but less continuous bandwidth adjust-ment is achieved. As in Reference 11, the filterantenna have a fixed bandwidth to achieve continuous adjustment of the CF.…”