A new filtering monopole antenna with wideband harmonic suppression

Abstract

In this letter, a new integrated filtering monopole antenna with wideband harmonic suppression is presented. In the design of the proposed antenna, a compact multiple harmonic suppression low pass filter is introduced and its stopband characteristic from 5 to 20 GHz is well integrated with the common monopole antenna. The final integrated filtering antenna can work from 2.88 to 4.02 GHz, and its wideband harmonic suppression successfully achieves 5.8 times of the central working frequency. The good performances of the present filtering antenna are shown by the simulated results and measured results, which could be a good candidate for the 5G anti‐interference wireless terminal communication system.

Substrate integrated waveguide omnidirectional filtering antenna with a controllable radiation null for 5.8 GHz WiFi application

“…Some filtering antennas were also reported to have an enhanced impedance bandwidth, [1][2][3] and other filtering antennas have the capability to suppress the harmonics. [4][5][6][7] According to the radiation pattern, the filtering antenna can be divided into two categories, the directional filtering antenna 1,2,4-6,8-17 and the omnidirectional filtering antenna. 3,7,[18][19][20][21][22][23] The radiating element for a directional filtering antenna is usually a patch, 2,5,6,[8][9][10][11] slot, 1,[12][13][14][15][16][17] and ring, 4 while for an omnidirectional pattern, the radiator can be a monopole 3,7,[18][19][20][21][22] and coco antenna.…”

“…[4][5][6][7] According to the radiation pattern, the filtering antenna can be divided into two categories, the directional filtering antenna 1,2,4-6,8-17 and the omnidirectional filtering antenna. 3,7,[18][19][20][21][22][23] The radiating element for a directional filtering antenna is usually a patch, 2,5,6,[8][9][10][11] slot, 1,[12][13][14][15][16][17] and ring, 4 while for an omnidirectional pattern, the radiator can be a monopole 3,7,[18][19][20][21][22] and coco antenna. 23 Although the directional filtering antenna may have a higher gain than the omnidirectional filtering antenna, the omnidirectional filtering antenna is more useful in a communication system where large area coverage is required.…”

“…The filtering antenna which efficiently integrates the filter and antenna into a single module has attracted growing attentions in recent years 1–24 . Compared with an ordinary antenna, the filtering antenna can eliminate strong out‐of‐band interference in a communication system.…”

“…Not only the size is reduced, but also the loss generated by the matching networks is eliminated. Some filtering antennas were also reported to have an enhanced impedance bandwidth, 1–3 and other filtering antennas have the capability to suppress the harmonics 4–7 …”

“…According to the radiation pattern, the filtering antenna can be divided into two categories, the directional filtering antenna 1,2,4–6,8–17 and the omnidirectional filtering antenna 3,7,18–23 . The radiating element for a directional filtering antenna is usually a patch, 2,5,6,8–11 slot, 1,12–17 and ring, 4 while for an omnidirectional pattern, the radiator can be a monopole 3,7,18–22 and coco antenna 23 .…”