Conical Beam Array Antenna With Polarization Diversity

Abstract

This study designed a 2 2 circular disc array antenna with omnidirectional radiation pattern and polarization diversity. Each disc element was located above a circular slot fed by an L-shaped strip, in which the switching between two orthogonal linear polarizations (LP) and circular polarization (CP) were realized by controlling two pin diodes. To allow conical beam for all polarization senses, a meticulously designed cross-shaped feeding network is proposed, and besides showing a sufficient 10 dB return loss bandwidth that covers the 2.4 GHz band of WLAN operation, good cross-polarization level (XPL) were measured when the array operated in all available polarization senses.

Circularly Polarized Omnidirectional Antenna with Dipole Core and Diagonally Adjoined Parasitic Braces for ISM Band Applications

“…In [5], bended dipoles integrated with baluns were used to realize circular polarization with 2.32-2.61 GHz axial ratio bandwidth and a gain of 1.2 dBic. In [6], a circular slot fed by an L-shaped strip was proposed to realize circular polarization. The antenna gains in [2][3][4][5][6] were less than satisfactory, however.…”

“…In [6], a circular slot fed by an L-shaped strip was proposed to realize circular polarization. The antenna gains in [2][3][4][5][6] were less than satisfactory, however.…”

Conical-Beam Circularly-Polarized Microstrip Antenna Array for Ceiling Mount Doppler Sensors

“…Although such approach ensures wide bandwidth and good radiation properties it occupies significant amount of space and requires usage of an electromagnetic wave absorber. Some examples of sequentially-rotated conical-beam circularly-polarized microstrip antenna arrays were described in [21], [23] and [26], in which the circularly-polarized radiating elements were appropriately located and excited. Another circularly-polarized antenna producing conical-beam was described in [26] and was composed of four sequentially-rotated L-patches with the shorting walls.…”

Wideband circularly‐polarised high‐gain diversity antenna loaded with metasurface reflector for small satellite applications

“…Recently, circularly polarised (CP) antennas are prominent in satellite communication systems due to the flexibility in the arrangement of antennas at both trans-receiver side and also reduces the losses occurring due to the Faraday rotation effects [1]. A wide variety of high gain antenna designs with CP characteristics are found in [1][2][3][4][5][6]. They use techniques such as metasurface loading [1], artificial magnetic conductors loading [2,3], antenna arrays [4], printed dipoles [5], and metamaterial absorber loading [6], and so on.…”

“…A wide variety of high gain antenna designs with CP characteristics are found in [1][2][3][4][5][6]. They use techniques such as metasurface loading [1], artificial magnetic conductors loading [2,3], antenna arrays [4], printed dipoles [5], and metamaterial absorber loading [6], and so on. These antennas will provide a larger volume [5], higher antenna profile [2][3][4][5][6], and narrow impedance bandwidth [2,6].…”