Compact frequency reconfigurable triple band notched monopole antenna for ultrawideband applications

Abstract

A compact ultra-wideband (UWB) reconfigurable microstrip fed monopole antenna having size of 0.22 λ 0 × 0.28 λ 0 × 0.005 λ 0 with switchable frequency bands is presented. Triple band notched characteristics are achieved by inserting two stubs at top of radiator and one slot in between the radiator and microstrip feed line. Proposed antenna achieves reconfigurability with three PIN diodes at strategic positions to obtain eight different operational modes. In one of the operational modes, antenna operates in the entire UWB (3-14 GHz) with fractional bandwidth of 127.5%. Two stubs are used to notch two frequency bands worldwide interoperability for microwave access (3.3-3.6 GHz/WiMAX) and C-band (3.7-4.2 GHz). T-shaped slot is also inserted to notch wireless local area network (5.725-5.825 GHz/WLAN) frequency band. Proper biasing of PIN diodes is done by using suitable chip inductors and capacitors. Proposed antenna exhibits stable radiation patterns with average gain of around 3 dBi. Simulation and measurement results are in good agreement. Proposed antenna is suitable for on-demand band rejection of parasitic bands coexisting in UWB. K E Y W O R D S frequency reconfigurable, monopole antenna, PIN diode, ultra wideband

Design and analysis of on‐demand reconfigurable WiMAX / WLAN high isolation 2 × 2 MIMO antenna oriented adjacent/orthogonally for imaging applications in UWB‐X band

“…However, researchers face a major challenge in designing these UWB‐MIMO antenna configurations because the required bandwidth and isolation between the radiation elements have to be maintained. As reported, 1 two stubs are used in a compact size antenna (0.22λ o × 0.28λ o ) and these filters are reconfigured by using PIN diode. Also, a reconfigurable MIMO antenna using a multi‐branch grounded T‐shape stub achieves isolation better than 15 dB 2 .…”

Ultrawideband Antennas: Growth and Evolution

“…Five PIN diodes have been used to perform the switching between the seven stages of operation. References [154,155] have presented a G-shaped monopole UWB reconfigurable antenna with a PIN diode for switching and a cup-shaped UWB reconfigurable antenna with rejection in three bands using stubs and slots with three PIN diodes for switching, respectively. In [156], the authors have proposed the usage of hexagonal SRR metamaterial cells and switches for reconfiguration.…”

A miniaturized reconfigurable unlicensed ultra‐wideband antenna with multiple band‐notch performance

“…Conventionally, the reconfigurable band-notch property is achieved by using radio frequency switches such as ideal switch, 5 PIN diodes, [6][7][8][9][10][11][12][13][14] MEMS 15,16 and varactor diodes. [17][18][19][20][21] In [11], the reconfigurable band-notch is realized by controlling the states of the PIN diodes inserted in the R-shaped stub and Tshaped slot. In [15], the band-notch reconfigurability is produced by turning the MEMS switches up or down, which is integrated in the U-shaped slot or L-shaped stub.…”

“…Thus, it is desirable to design UWB antennas with reconfigurable band‐notch performance. Conventionally, the reconfigurable band‐notch property is achieved by using radio frequency switches such as ideal switch, 5 PIN diodes, 6‐14 MEMS 15,16 and varactor diodes 17‐21 . In [11], the reconfigurable band‐notch is realized by controlling the states of the PIN diodes inserted in the R‐shaped stub and T‐shaped slot.…”

“…To achieve the reconfigurable band-notches, three PIN diodes are embedded in the C-shaped slots and the parasitic strip. Compared to the reconfigurable triple band-notch UWB antennas, 5,10,11,13,20 the size of the proposed antenna is the smallest. In comparison with the reconfigurable triple band-notch antennas for similar bands, 5,10,13 the dimension of the antenna in this work reduces 34%, 64%, and 80%, respectively.…”