Electromagnetically coupled coaxial dipole array antenna

Omnidirectional uniplanar elecromagnetically coupled antenna array

“…The feeding TCS line, shown in Figure 1(a), is open ended at a distance g 2 ϭ 3/4 g between the last feeding point (that is, the last slot) and the open end. Basically, a similar concept was used for coaxial antenna array in [4].…”

A low sidelobe and high gain omni-directional COCO antenna array

“…Since the sidelobe of common COCO antenna is about10dB, to achieve a sidelobe less than -15dB, a new trapezoidal patches is designed in this antenna [10]. The schematic diagram of the antenna is shown in Fig 1. As the radiation of each unite patch is added at far field ,the electric intensity in far field will enhance by the number of units increasing, to obtain a high gain more than 7dB, there are six sections of trapezoidal coaxial strips and five connections and a feeding microstrip in each side of the antenna.…”

Reconfigurable antenna with high-directive beam using active cylindrical PRS

“…The proposed antenna is mainly composed of a cylindrical EBG structure and an excitation source. The excitation source is achieved through a 4-coaxial-dipole array [5] located at the center of the EBG. Furthermore, the EBG structure is used as a Partially Reflecting Surface (PRS) with active elements like PIN diodes that work as a reflector to increase the directivity of the antenna in elevation plane.…”

“…Circular pipe fed electromagnetically by a slot ring in the middle of the circular pipe with width of Wslot = 0.0041Ao on the outer conductor of the coaxial cable. The metallic circular pipes work as radiating dipoles and their in-phase excitation gives an array performance [5]. The coaxial cable has a dielectric constant of 2 978-1-4244-3647-7/09/$25.00 ©2009 IEEE and the inner and outer radius of conductors is O.0026Ao and O.0085Ao, respectively, where Ao is the wavelength of working frequency 10 = 2GHz.…”