Suppressing up to fourth harmonic of an ISM band microstrip patch antenna using compact defected ground structures

Abstract

Defected ground structure (DGS) consisting of 2 I-shaped etched-out patterns underneath a microstrip line with an inverted L-shaped stub is proposed to suppress all higher harmonics up to fourth harmonic of an inset cut microstrip patch antenna. The overall size of the proposed DGS and the position of the stub are optimized to achieve wide stop-band characteristics. All the higher order harmonics are investigated and suppressed successfully by utilizing the proposed compact DGS of area 24%-96% smaller than that published in other related articles. The overall length of the proposed DGS is successfully formulated and verified at the desired resonating frequency of the stop-band. The antenna is designed for ISM band (2.41-2.46 GHz) applications. An equivalent circuit of the proposed DGS is also modeled and the same is verified using ADS 2009. The simulated results are validated experimentally and good mutual agreements between the simulated and experimental results are observed. K E Y W O R D S DGS, inset cut, microstrip feed line, higher order harmonics, microstrip patch antenna, ISM band

Grating Lobes Suppression in Frequency Selective Surfaces Using Electromagnetic Band Gap with Square Holes

“…Several techniques have been used to suppress spurious modes, such as the use of defects in the ground plane (Defected ground structure -DGS) of planar antennas [7], [8], or the use of metamaterials in microstrip filters [9], [10] and the use of electromagnetic bandgap (EBG) in planar antennas [11], [12]. However, it is not known to the authors the use of these techniques for suppression or reduction grating lobes in FSS.…”

Ultrawideband Harmonic Suppression in Microstrip Patch Antenna Using Novel Defected Ground Structures

“…Alternative approaches such as the introduction of photonic bandgap structures [3], tuning stubs [4][5][6], DGS [7,8], and hybrid structures [9][10][11][12][13] have been proposed to overcome the problem. In 1999, a two-dimensional photonic bandgap structure was employed by Horii and Tsutsumi to reduce the harmonic radiation in a rectangular microstrip patch antenna, and suppression up to third harmonics was demonstrated [3].…”

“…In [12], a pair of partial ring DGSs instead of a pair of circular headed dumbbell DGSs was utilized, lowering the DGS area by 40%. Recently, a pair of I-shaped DGSs and an inverted L-shaped stub were proposed to realize the fifth harmonic suppression [13]. However, the area occupied by DGS is relatively large.…”

On the design of planar antenna using Fibonacci word fractal geometry in support of public safety

“…A triple band antenna with DGS was reported in Reference, for WLAN and WiMAX applications. Microstrip patch antenna with two I‐shaped DGS and modified T‐shaped microstrip patch antenna with I slot DGS were reported, for X‐band and Ku‐band applications. A hexagonal‐shaped minkoskwi‐based fractal antenna was discussed in Reference, for vehicular communication, WiMAX and global positioning system applications, but antenna structure is multilayered structure.…”