Compact log‐periodic dipole array antenna with bandwidth‐enhancement techniques for the low frequency band

Abstract

A compact planar log‐periodic dipole array (LPDA) antenna operating from 0.55 to 9GHz with high measured gain is proposed to be implemented in a reverberation chamber as a source antenna. To minimise the total size of the LPDA antenna, variants of top‐loading techniques are utilised, and a much smaller spacing factor is opted to specify the spacing between the elements. However, miniaturisation of the LPDA antenna limits the antenna's wideband characteristics over the desired range of frequencies. Hence, a feedline meander and a trapezoidal stub are incorporated into the design as impedance matching techniques to effectively enhance the bandwidth performance especially for the lower band of the antenna's operating frequency range. The LPDA antenna exhibits radiation patterns with and without a radome having the measured gain ranging from 2.48 to 7.89 dBi and from −1.20 to 7.94 dBi, respectively.

Development and Validation of New Reverberation Chamber for Wireless Devices

“…Figure 12 shows a photograph of the developed LPDA antenna. Detailed results for this LPDA antenna are described in [23]. A Rogers RO4003 substrate was used to fabricate the LPDA antenna, and its overall size was 282 mm × 194 mm × 0.508 mm (L × W × H).…”

Printed log‐periodic trapezoidal dipole array antenna with a balun‐feed for ultra‐wideband applications

“…As listed in Table 1, no comparison can be made in some studies because the final dimensions of the antennas were not given. In [7, 19], the antenna bandwidth is broader than the bandwidth of the proposed antenna. However, the antenna performance of the PLPTDA antenna is better in terms of the variation of the gain value along the bandwidth and the maximum value of gain.…”

Wideband planar monopole antenna for digital TV reception and UHF band communications

“…This research was supported by the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the C-ITRC (Convergence Information Technology Research Center) (grant no. IITP-2016- [4] 0.39λ × 0.22λ × 0.002λ 1070-3360 103.39 3.7 [6] 0.23λ × 0.06λ × 0.001λ 474-1212 87.54 1.9 [8] 0.28λ × 0.28λ × 0.004λ 700-4710 148.24 5.4 [16] 0.60λ × 0.31λ × 0.001λ 500-3000 142.86 6.9 [19] 0.52λ × 0.36λ × 0.003λ 550-8500 175.69 7.9 [21] 1.18λ × 0.35λ × 0.001λ 2337-2690 12.65 5.1 [22] 0.56λ × 0.48λ × 0.…”

“…The planar monopole antenna offers these physical features and characteristics [1][2][3][4][5][6][7][8]. Moreover, various antennas with wideband and small size have been reported for UHF band applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Some are unable to operate in the whole UHF band, owing to their small size [2][3][4][5][6][7][8].…”

“…In addition, although the antenna indicates for wideband characteristics, they have three-dimensional (3D) structure and large ground plane [9][10][11][12][13][14]. The other antenna varieties are able to cover the UHF band, but they are relatively large in size [15][16][17][18][19].…”