A Compact Ultrawideband Reflector Antenna: Using a Wide-Band Omnidirectional Antenna with a Mechanically Steerable Endfire Beam to Illuminate a Half-Cut Paraboloid Reflector

Elliptical Ring Antenna Excited by Circular Disc Monopole for UWB Communications

“…Furthermore, the low profile and size compactness are important features for actual applications. e antennas with a flat ground plane or reflector are low profile at the expense of a large planar dimension [3][4][5][6][7][8][9]. e modified biconical antenna [10] without a flat ground plane can overcome the bulky ground plane.…”

“…In Figure 17, the pulse distortion in E-plane in the upward direction was observed around 6 GHz and became less severe afterward. e phenomenon could be attributed [6] 0.88λ L × 0.88λ L × 0.216λ L 2.20-6.50 98.85 7.0-10.0 [7] 0.98λ L × 0.98λ L × 0.383λ L 1.66-11.00 147.55 8.7-18.9 [8] 0.67λ L × 0.67λ L × 0.050λ L 2.50-24.00 162.26 3.5-10.0 [9] 0.35λ L × 0.35λ L × 0.242λ L 0.58-1.75 100.43 3.6-5.5 [10] 0.29λ L × 0.29λ L × 0.270λ L 1.50-41.00 185.88 1.2-4.7 [11] 0.42λ L × 0.42λ L × 0.013λ L 2.50-12.0 131.03 2.0-6.0 [12] 0.21λ L × 0.29λ L × 0.004λ L 3.10-10.60 109.49 -1.0-3.0 [13] 0.21λ L × 0.25λ L × 0.013λ L 2.38-11.80 132.86 2.8-5.6 [14] 0.19λ L × 0.27λ L × 0.002λ L 2.85-11.85 122.45 − 1.2-3.2 [15] 0.47λ L × 0.53λ L × 0.004λ L 3.10-10.60 109.49 2.0-5.5 [16] 0.28λ L × 0.30λ L × 0.015λ L 2.80-12.00 124.32 4.0-5.0 [17] 0.24λ L × 0.36λ L × 0.015λ L 2.90-10.80 115.33 1.00-4.25 [18] 0.46λ L × 0.43λ L × 0.019λ L 3.50-11.70 107.89 4.33-6.00 [19] 1. to the induction of electric fields in the area between the top of the CDM and the elliptical ring. In Figure 18, the pulse distortion in E-plane in the downward direction became worse beyond 6.5 GHz as the electric fields in the area between the feeding point and the connector were induced.…”

“…Antennas with planar monopoles protruding from a perpendicular ground plane have been proposed in [3][4][5][6][7][8][9]. e antenna with a consistent monopole-like radiation characteristic was proposed [3].…”

“…e very wideband operation could be achieved with a reasonable gain. In [6,7], the UWB antennas with a reflector were presented for high gain and steerable beam purpose. e UWB patch antenna with a top loading was also designed for the WBAN system [8].…”

Automotive Antenna Roof for Cooperative Connected Driving

“…However, in order to evaluate the antenna positions and modules it is desired to measure standard wideband antennas. For this purpose, conical monopole antennas [42], [43] were used to characterize the antenna positions in a wide frequency range from 0.8 to 6 GHz. The cone angles were adapted to match the antenna impedances to the 50 Ohm feed cable impedances.…”