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A realization of a negative-refractive-index (NRI) metamaterial uses a periodic structure with a unit cell composed of a capacitively loaded loop (CLL) and a conducting pole. This realization can lead to a lens mechanism with refraction focusing. This paper presents the results of a simulation of such refraction focusing using Ansoftpsilas HFSS. The simulation shows the return loss of a transmitting...
A perturbed slot with reconfigurable polarization is presented that allows operation in LHCP, RHCP, or LP. This antenna topology is well-suited for wireless communications applications requiring polarization diversity. This design is realizable using cost effective printed circuit board technology making it an attractive design for low cost personal communications devices.
Two miniature phased array antenna designs that can be used in small wireless sensor packages to access satellites are presented in this paper. The antennas are designed using an array simulation program. The two models are 19- and 37-element arrays with diameters of 2.35 and 3.35 cm, respectively, operating at the Ka band frequency of 30 GHz. The antennas are well-suited for the small wireless sensors...
Size reduction of the antennas in personal wireless communications has become an important task for the antenna engineer due to the increasing popularity of compact handsets. In this paper, a new technique to reduce the size of a shorted annular ring (SAR) antenna is presented. This technique uses a capacitive loading structure that is analogous to a parallel plate capacitor. Increasing the antenna...
Interest in terahertz science has expanded rapidly in recent years due largely to the advent of new RF components and new fast-pulse optical time domain spectroscopic techniques. The two traditional development communities that border the terahertz gap - optical and microwave, are beginning to converge as we see more wide spread use of terahertz systems. One technology area where both these communities...
This paper describes a concept for a hybrid antenna that combines the conventional reflector with an array of printed circuit elements that uses the reflector surface as the array aperture. The objective is to increase the gain and the functionality of the antenna by reusing the conical surface of the reflector as a direct radiating array. The reflector surface can be a single parabolic or a dual...
A simple, low-cost, 20-GHz MMIC/MIC-to-waveguide septum-type transition is described for rectangular, square, or circular waveguides operating in single- or dual-polarization modes. The MMIC is attached to a dielectric substrate surface with a circuit that transforms the waveguide impedance to that of the MMIC. Good insertion loss, return loss, and cross polarization are measured.
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