A Q-Slot Monopole for UWB Body-Centric Wireless Communications

Abstract

Abstract-This paper presents a novel and simple ultrawideband (UWB) printed rectangular monopole antenna (PRMA) for body-centric wireless communications. The design is based on etching a Q-slot on a rectangular radiator, and is optimized to produce the largest bandwidth in free space and close to the human body. We analyze the design of the proposed antenna and assess its performance in terms of bandwidth, gain, efficiency, and radiation patterns. We also characterize the antenna in the time-domain by calculating its fidelity factor. Our results show that the Q-slot antenna maintains its bandwidth when placed in close contact with the human body, or in contact with breast-mimicking tissue phantoms. The very good agreement between calculated and measured antenna performance in free space and on body suggests that the antenna is immune to variations in the human tissue, and is also robust to fabrication tolerances.

Elliptical Ring Antenna Excited by Circular Disc Monopole for UWB Communications

“…However, the antenna volume is relatively huge. e patch antennas using a printed circuit board (PCB) [11][12][13][14][15][16][17][18][19] that can accommodate the radiator and ground plane within the single structure such as coplanar waveguide (CPW), strip line, and partial ground plane can reduce the overall antenna size with the suffered gain limitation. Apparently, the antenna presented in this work is compact with a very wide impedance bandwidth and efficient gain.…”

“…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.…”

“…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]. e main advantage of these antennas is that the flat structure could be readily integrated into electronic circuits.…”

Investigations of Specific Absorption Rate and Temperature Variations for an Uwb Antenna for Wireless Applications

“…Authors in [3] designed a reconfigurable spiral antenna for biomedical applications over an FR4 substrate with a size of 32 × 50.3 × 1.8 mm 3 . In a Q-slot monopole antenna for UWB body centric communication, a slot was introduced in the patch to have additional resonance [4]. Paper [5] discussed the bandwidth enhancement technique and also addressed SAR issues using T-junction dual symmetrical meander line antenna.…”

Design of a miniaturized planar half elliptical ultra‐wideband dipole using a concaved arm

“…Miniaturized antennas receive considerable research attention in both the academia and industries. In particular, miniaturized ultra‐wideband (UWB) antennas are highly desired in space‐limited applications such as body‐centric wireless communications, wireless universal serial bus, and biomedical implants . Several miniaturization approaches have been proposed to realize small UWB antennas .…”