Antenna for Ultrawideband Channel Sounding

Abstract

A novel compact antenna for ultrawideband channel sounding is presented. The antenna is composed of a symmetrical biconical antenna modified by adding a cylinder and a ring to each cone. A feeding coaxial cable is employed during the simulations in order to evaluate and reduce its impact on the antenna performance. The optimized antenna demonstrates S11 below-10 dB and a stable omnidirectional radiation pattern robust against the cable effect over the frequency band 1.5-41 GHz despite its compactness (the maximum electrical dimension is of 0.29λmax, where λmax is the free space wavelength at the lowest frequency of operation). A prototype of the antenna is fabricated and tested. The simulated and measured S11 are in a good agreement. Measured radiation patterns confirm the pattern stability in terms of the direction of maximum radiation and 3 dB beamwidth.

User Effects on the Circular Polarization of 5G Mobile Terminal Antennas

“…The phantom's accuracy is verified by measuring the linearly polarized omnidirectional UWB antenna proposed by [17] in two orientations. The chosen antenna has a gain of approximately 5 dBi at 28 GHz.…”

Elliptical Ring Antenna Excited by Circular Disc Monopole for UWB Communications

“…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. However, the antenna volume is relatively huge.…”

“…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.…”

“…Despite low profile structure, these antennas lack a compact size because of its extended ground plane structure. To obtain a more compact structure, the modified biconical antenna [10] and the coplanar waveguide (CPW)-feeding antennas [11][12][13][14] have been reported for some specific applications. In addition, the printed antennas with different structures in both sides had been realized for bandwidth enhancement size miniaturizations [15][16][17][18][19].…”

Biconical antenna with inhomogeneous dielectric lens for UWB applications

“…Introduction: Biconical antennas are widely used as parts of ultrawideband (UWB) radio systems when an omnidirectional radiation pattern in the azimuthal plane is required [1,2]. Their bandwidth and gain in the main direction of radiation depend on the antenna geometry, which is illustrated in Fig.…”