Dielectric Rod Antenna Design Research Articles

A Fast Geometric Optics-Based Design Approach for Dielectric Rod Antennas

A simple and effective dielectric rod antenna design approach based on geometric optics and modal analysis is presented. The tapered antennas from microwave to terahertz can be readily designed with the equations presented in this paper. The radius of antenna is determined by the desired traveling wave mode inside the antenna. The field inside the antenna consists of the fundamental mode and the second mode. For the end-fire operation, there is only the fundamental mode. The length of the antenna is designed based on geometric optics theory so that most of the traveling wave will be converted to the radiating field towards the output plane, avoiding reflection inside the antenna. Such antennas can achieve wide bandwidth. The gain increases with the length of the antenna as long as the diameters and length satisfy the conditions given in this paper. A number of antenna design examples with high gain and wide bandwidth are presented. The measurement results of a 130 GHz rectangular antenna with a length of 4λshow a bandwidth of 60 GHz and a gain of 12 dB.

NEW METHOD FOR ULTRA WIDE BAND AND HIGH GAIN RECTANGULAR DIELECTRIC ROD ANTENNA DESIGN

A novel method for tapered rectangular dielectric rod antenna design is presented. This method can be used to design from millimetre to terahertz antennas. The work modes of antenna have been analysed. The input modes are fundamental mode and second mode, and the end-flre mode is only fundamental mode. The calculation formulas for bottom diameter and top diameter are given according to the work modes. In order to avoid standing wave in the antenna, the wave will not re∞ect on the boundary surface of antenna. The calculation formula of antenna length is given based on the radial theory. Difierent shaped 300GHz antennas have been designed based on the method. The results indicate that this method is suitable for difierent shapes of rectangular rod antennas. We also give the other two 1THz and 32GHz antenna design to demonstrate this method. The antenna gain will increase with the length expanding based on our design. The bottom and top diameters can be tuned slightly because the work mode formulas of rectangular dielectric waveguide are derived approximately. As an example difierent tuning designs of 100GHz indicate that the tuning region is based on the calculation results. The design results have ultra wide bandwidth which is almost 50% of centre frequency and high gain.

Dielectric Rod Antenna Array With Substrate Integrated Waveguide Planar Feed Network for Wideband Applications

Dielectric rod antenna (DRA) elements have numerous advantages over conventional waveguide and horn antenna elements. They have low insertion loss, broadband input match, high mutual decoupling efficiency, and low-cost manufacturing. Additionally, the radiation pattern of the dielectric rod antenna is almost frequency-independent. However, its feeding is generally a challenge. This paper demonstrates a novel ultrawideband (UWB) eight-element DRA fed by a wideband substrate integrated waveguide (SIW) structure. The eight-way feed net work has less than 1.1 dB insertion loss and only ±0.9 dB and ±4° amplitude and phase imbalance, respectively. The developed low-cost and compact dual-layer DRA design covers over 40% bandwidth at X-band. It has a good input match, almost constant radiation pattern with a gain of 14.5 ± 2 dB over the frequency band, low dispersion, low squint performance, and almost flat group delay, which are essential requirements for many UWB ap plications. The developed array antenna is compact and occupies only 10 × 9 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .

Design of Short Axial Length High Gain Dielectric Rod Antenna

A novel design of dielectric rod antenna is presented here. Compared to the conventionally used tapered dielectric antennas, this configuration is capable of producing higher gain for a given length of the antenna. The design of an antenna using the new configuration having a gain of 16.7 dBi at 5.6 GHz is discussed. The length of this antenna is 2.3 , which is considerably less compared to the conventional design. The material used for the antenna is Teflon. Along with the detail simulated results, the measured results of the fabricated prototype antenna are also presented.

A tapered-permittivity rod antenna for ground penetrating radar applications

A new dielectric rod antenna design modified from its previous version developed by Chen [IEEE Trans. Geosci. Remote Sens. (accepted for publication)] is presented. Such an antenna is useful in detecting small and shallow subsurface objects with excellent depth and spatial resolutions. These features make it useful in detecting small anti-personnel (AP) mines, pavement cracks and the surface layer. Broad bandwidth electromagnetic energy is fed into the rod from one end, guided along the rod and then radiated from the other end where the rod diameter is linearly tapered to a point. The tapered-permittivity design uses an additional permittivity taper to overcome the problem of a frequency-dependent pattern when high dielectric material is used for size reduction. This new design reduces the internal reflections at the tapered section and results in better efficiency and less antenna clutter.