X-band compact dual circularly polarized isoflux antenna for nanosatellite applications

Abstract

International audience— This paper presents an original solution to design a compact dual circularly polarized isoflux antenna (DCPIA) for nanosatellite applications. This kind of antenna has been previously designed in our laboratory, for a single circular polarization. This antenna is composed of a dual circularly polarized feed and a choke horn antenna. This feed is a cross-shaped slot in the ground plane which provides coupling between a patch and a ring microstrip line with two ports. It is located at the centre of a choke horn antenna. The simulated antenna presents an axial ratio (AR) lower than 3 dB and a realized gain (RG) close to 0 dB over a 400 MHz bandwidth (8.0-8.4GHz) at the limit of coverage (LOC), i.e. 65° whatever the azimuth angle (φ) and the port. A 20 dB matching for each port and 13 dB isolation characteristics between the two ports have been achieved on this bandwidth. It has been realized and successfully measured

Design of 4 × 4 Low-Profile Antenna Array for CubeSat Applications

“…Moreover, this antenna showed return loss values of −18.5 dB, a bandwidth of 163 MHz, and a gain of 6.08 dB. Concerning the X band, a design for a compact antenna for isoflux radiation with circular polarization operating in the X band (8–8.4 GHz) was presented in [ 28 ]. Moreover, an array of 25 elements operating in the central frequency of 8.2 GHz with a realized gain of −10 dB was proposed in [ 29 ].…”

High inter‐port isolation dual circularly polarized slot antenna with interdigital capacitor

“…The most straightforward approach is to excite the microstrip antenna (MSA) by means of two distinct and spatially orthogonal feeds with a phase‐difference of 90° between them as reported in References . However, in these works, either the antenna has a large electrical size, or the AR bandwidth is low, or the antenna suffers from narrow impedance bandwidth . The linearly polarized MIMO antenna in Reference has a meander line resonator used to reduce the coupling between antenna ports.…”

“…In this work, we propose a DCP FDX slot antenna with high inter-port isolation and wider impedance and axial ratio (AR) bandwidth compared to contemporary designs. [4][5][6][7] This design incorporates the approach presented in Reference 7, where it was shown that the inter-port isolation may be enhanced by introducing a net negative admittance of −jβ to cancel out the residual signal between the T X and R X ports. The designed antenna has two "8" shaped slots inclined at 135 and 45 to the horizontal axis for R X and T X operations respectively.…”

Circularly polarised wideband quadrifilar helix antenna with ultra‐wide beamwidth isoflux pattern for a S‐band satellite ground station

“…According to these requirements, various structures have been developed and investigated. Some practical antennas such as cross dipoles [4], bifilar helixes [6,7], quadrifilar helixes [8], conical spirals [9] and isoflux antennas [10] have been investigated in the literature.…”