Printed circular ring monopole antennas

Abstract

1 reconfigures its radiation direction in three switchable directions in the H-plane, that is, Ϫ25°, 0°, and ϩ25°. In comparison with the original RMPA, it eliminates two switches and sacrifices only a slight decrease in the tilt angle of the pattern. After replacing the switches with varactors, variation 2 is able to continuously scan its radiation pattern from Ϫ27°and 27°by controlling the value of the varactors. Variation 3 expands the H-plane pattern scan range to Ϫ(32°, 54°) ഫ (32°, 54°) by using inductors to series-resonate the varactors in variation 2. Variations 1 and 2 have a combined impedance and pattern bandwidth of more than 4.5% with respect to the center frequency, while variation 3 has a bandwidth of only 1.5%. In all the experiments, copper strips were used as switches in an on/off state and differently valued chip capacitors were used to mimic the behavior of the varactors. Implementation of electronic control of the radiation behavior of these antennas using PIN diodes and varactors is underway.

An ISM/UWB Antenna with Offset feeding and Slotted Ground Plane for Body-centric Communications

“…The design of efficient and compact size antennas for wideband applications is still a major challenge nowadays. Many microstrip-fed and coplanar waveguide-fed antennas have been reported for UWB applications [6][7][8][9][10][11][12] and the UWB propagation channel has also been studied [13]. These antennas employed either the monopole configuration with different shapes (circular ring, ellipse, annual ring, triangle, pentagon or hexagon) [10,11] or the dipole configuration (e.g.…”

Improved Grating Monopole Antenna With Zigzag for DVB-T Application

“…These techniques include the use of a concavity in the ground plane [7], sleeve monopole antenna [16][17][18], circular-ring monopole antennas [19], a multiple-ring monopole antenna with sleeve-shaped ground [9] and a bevelling radiating element [20]. They have lengths between 135 mm and 257 mm.…”

Ultra-Wideband monopole antenna with modified ground plane

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IntroductionUltra-Wideband (UWB) technology has drawn great attention since its emergence at the beginning of the new millennium, and the monopole microstrip antenna with a truncated ground plane has proved to be a good UWB antenna choice as shown in [1][2][3]. A different shape of microstrip monopole antenna is introduced to cover most of the UWB systems with satisfactory characteristics that meet UWB technology requirements.

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