Elliptical Ring Antenna Research Articles

Elliptical Ring Antenna Excited by Circular Disc Monopole for UWB Communications

This research proposes a compact elliptical ring antenna excited by a circular disc monopole (CDM) for ultra-wideband (UWB) communications. In the study, time- and frequency-domain pulse distortions of the antenna in the transmission mode were characterized by magnitude and phase of the antenna transfer function (Hrad). The results showed that the gain and magnitude of Hrad in the boresight direction are sufficiently flat with linear phase response. The average antenna gain is 3.9 dBi over the UWB spectrum. The antenna also exhibits low pulse distortion with the correlation factors (ρ) of 0.98 and 0.93 for the fifth-order derivative Gaussian pulse and modulated Gaussian pulse with 6 GHz band rejection. The CDM-excited elliptical ring antenna possesses several attractive features, including wide bandwidth, flat gain, compactness, low cost, and low distortion.

A novel broadband magnetoelectric antenna

A broadband antenna based on magnetoelectric dipole is proposed. The proposed antenna is composed of a bowtie-shaped electric dipole and an elliptical ring antenna that works as a magnetic dipole. For a broadband performance, a microstrip-to-coplanar stripline transition balun is used to excite the antenna. All of them are printed on the same plane perpendicular to the ground. To validate the design, prototypes of the proposed antenna have been fabricated and measured. The measurement results show that the antenna has a wide impedance bandwidth of 66.7% (2.45–4.90 GHz) for voltage standing wave ratio (VSWR) less than 2 and a gain of 6.0–7.3 dBi over the operating frequency band. Meanwhile a high front-to back ratio better than 16 dB over the operating frequency is achieved. The agreements between the simulation and measurement results indicate that the proposed antenna is suitable for wireless communication systems and phased array systems. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:213–218, 2015.

Characteristics of an elliptical ring antenna excited by a linear electric probe

This paper presents the characteristics of an elliptical ring antenna excited by a linear electric probe. Based on the waveguide principle, the suitable cross-sectional dimension of the ring that yields the dominant mode (TEC11 mode) will be formulated in terms of the cut off wavelength. The variation of the antenna characteristics, depending on cross-sectional dimension, ring length and probe length, were investigated using numerical electromagnetic code (NEC) based on the method of moments (MoM). From the experiment, the prototype antenna provides bidirectional pattern with HPBW in E-plane and H-plane of 83 and 46 degrees, respectively, and the gain of 5.1 dBi with SWR < 2:1 over the bandwidth of 14% for the operating frequency of 1.92 GHz. This antenna is applicable for mobile communication on a highway, on a street, in a corridor and in a tunnel with the advantages of simple configuration and low cost.

Ultra-wideband planar elliptical ring antenna

An elliptical ring antenna fed by a coplanar waveguide line for ultra-wideband applications is presented. The wideband performance is achieved by extending the length of the elliptical ring's major axis. The elliptical ring antenna has a 2:1 VSWR (return loss <10 dB) from 4.6 to 10.3 GHz and has an average gain of 4.48 dBi. The antenna radiation patterns show a stable variation within its operation band. The parameters determining the antenna wideband characteristic are discussed and the measured performance is presented.