Microstrip Patch antennas are very prevalent these days due to various attractive features possessed by them. Coplanar Waveguide (CPW) fed patch antenna has benefits of compact size, ease of fabrication and integration with other monolithic circuits. Moreover, the proposed design is very simple design fed with CPW feed. The proposed antenna performs dual band (1. 5 GHz and 7 GHz) operation with...

NASA Langley Research Center (LaRC) has pursued the development of tensioned membrane antenna technology for several years. For many applications, it is desirable to have space-based antennas which are very large. As the physical size increases, antennas constructed of conventional materials quickly become too bulky and heavy to be practical for space applications. For some of these application...

Recent progress in the development of Continuous Wave Terahertz sources based on Ultra-Fast Photodetectors operating at 1.55 μm is reported. The Uni-Travelling Carrier Photodiode is realised as a broadband and high-efficiency photomixer while the frequency response advantage of employing a travelling wave design is demonstrated. State-of-the-art bandwidth-efficiency product from Coplanar Wavegu...

A bow-tie slot antenna fed by a coplanar waveguide is designed for wideband operation for radar applications. The new design exhibits 40% bandwidth with center frequency around 1 1 GHz. One and two elements are designed analyzed and verification with measurements is presented.

The purpose of this work was to study the rectangular dielectric waveguide and its transitions to metalwaveguide at millimeter wavelengths. The thesis reviews different dielectric waveguiding structures, theiranalysis methods and their transitions to the metal waveguide. In this thesis work the analysis methods andtransitions are further developed. The main results of this work are:...

Interfaces between a coaxial structure and a post-wall waveguide are proposed as the essential components for cost-effective millimeter-wave modules. PTFE substrate is selected in terms of loss and manufacturability. The reflection and the transmission characteristics are investigated. The short-stepped and the short-taper-stepped feeding structures provide 14.7% and 13.2% bandwidths for the re...