Conical Monopole Antenna With Integrated Tunable Notch Filters

An Ultra-Wideband MIMO Bowl-Shaped Monopole Antenna with Sturdy and Simple Construction

“…Since this material has the characteristics of fre prevention, the antenna interior is more practical for vehicle applications. Compared with other works [9][10][11][12], whose structure is solid or requires several components, the proposed antenna, as a single component, is easy to fabricate by CNC, and the weight is light due to the hollow structure made of aluminum. Tus, the proposed antenna is more suitable for the use of vehicle antennas.…”

“…With their wideband and omni-directional radiation properties, monopole antennas have been widely used to achieve UWB-MIMO antennas [7][8][9][10][11][12][13]. In [7], a top-hat monopole antenna was conceived to achieve a conical radiation pattern, but it had a narrow bandwidth.…”

“…In [9], only a conical monopole antenna was designed to simplify the structure, but the weight was heavy due to the solid brass cone's high profle. Perforated alloy surfaces were adopted to realize lightweight structure in [10]. However, a 3D printing technique was required, resulting in a high cost.…”

“…In [13], novel wideband roll-monopole antennas were devised, but the structures were not sturdy. Among the monopole antennas [7][8][9][10][11][12][13], the structures are either complicated or heavyweight. To achieve UWB-MIMO antennas, decoupling structures, such as ground stubs, defected ground slots, and refectors, are mostly used to improve the isolation [14][15][16][17][18], which also complicates the design.…”

Low‐profile omnidirectional antenna with broad bandwidth and high gain

“…In vehicular communications, the mobile communications between a vehicle and base stations require low profile omnidirectional antenna to provide wide signal coverage 1,2 . The ordinary monopole antenna usually has omnidirectional radiation in the horizontal plane, 3–6 but the high profile is not conducive to the overall design of the vehicle. The microstrip antenna has a lower profile so that high‐gain microstrip antenna with omnidirectional radiation has gradually attracted the attention of researchers 7–10 …”