Multiband Pyramidal Antenna Loaded With a Cutoff Open-Ended Waveguide

Abstract

An original and flexible pyramidal antenna for satellite or terrestrial application services is presented. The ground plane of the antenna is perforated and loaded with a cutoff open-ended waveguide: this original configuration leads to a good tradeoff between rear radiation and impedance matching. Trap-loads are used to achieve multiband operation while frequency agility may be simply obtained by loading the radiating element by radio-frequency switches. The antenna radiates linearly or circularly polarized electromagnetic fields with quasi-hemispheric radiation patterns at multiple operating frequencies. Several prototypes have been simulated, manufactured, and finally measured. A specific application is given in this paper for a triband GPS/Galileo/MicroSat Telemetry antenna to combine positioning and telemetry applications. The experimental results confirm the good performances observed with the electromagnetic simulations.

Multiband pyramidal antenna for radio navigation and telemetry systems

“…The originally proposed pyramidal antenna consists of 4 inclined radiating elements printed on a square-base pyramid [1], [2]. Trap-loads are used to achieve resonant multifrequency behavior.…”

“…To improve input matching of the pyramidal antenna, the authors suggested to make a hole in the ground plane and continuing this hole by a cut-off cylindrical waveguide to keep reasonable rear radiation level [1]- [3]. This waveguide is designed such that no modes are propagating inside of it at the operating frequencies of the antenna.…”

“…The authors have recently introduced a new multi-band pyramidal antenna topology with independent and easily adjustable operating frequency ratios that combines radio navigation and telemetry applications [1], [2]. The proposed topology is also particularly flexible in terms of polarization as it depends only on the feeding network and not the radiating part.…”

“…Sierpinski version of the pyramidal multiband antenna[6] The minimum S 11 and the maximum rear radiation directivity versus the length of the cut-off and open-ended metallic waveguide[1] …”

Compact multi‐band novel‐shaped planar monopole antenna for DCS, Bluetooth, and ultra‐wide‐band applications

“…To mitigate the requirement of multi‐band communication applications, different antennas have been designed and developed [1–18]. Modified T‐shape radiating structure for multi‐band operation is proposed [1].…”