CPW - fed folded spiral strip monopole slot antenna for 5.8 GHz RFID application

Novel UWB hybrid dipole antenna with quasi-isotropic radiation pattern

“…The input impedance of the antenna is 34 -j16 Ω at 5.8 GHz. In many 5.8 GHz RFID applications, a bandwidth of 23% is considered over which the reflection coefficient is below -10 dB [10]. The introduced hybrid dipole antenna, however, demonstrates a bandwidth of more than 25%.…”

Compact coplanar waveguide‐fed monopole antenna with a folded ground strip for 5‐GHz wireless applications

“…Unlike the aforementioned designs [1][2][3][4][5][6][7] that built on a 1.6-mm FR4 substrate (e r ¼ 4.4 and loss tangent 0.02), the proposed antenna geometry as depicted in Figure 1 is printed on a 0.8mm-thick FR4 substrate. Here, a vertical monopole fed directly by a 50 X feed line is top loaded by an inverted L-shaped radiating element.…”

“…The reconfigurable characteristics of antennas are very valuable for many modern wireless communication and radar system applications, such as object detection, secure communications, multifrequency communications, and vehicle speed tests. The reconfiguration can be implemented through the use of integrated switches, such as p-i-n doping structure device (PIN diode) switches [7], optoelectronic switches [8], and microelectromechanical switches [9]. In the applications of reconfigurable antennas, switches are integrated in a shared radiation aperture.…”

“…Hence, a compact CPW‐fed monopole antenna for 5‐GHz band application is proposed [6]; however, this design can only offer either the 5.2‐ or the 5.8‐GHz operating band by tuning the length of its radiating element. To operate across the entire 5‐GHz band, a folded‐slot antenna is therefore studied [7], but the size of this antenna is twice of Ref. 6 at around 16.5 × 20 mm 2 .…”