-This paper reports the development and characterization of a novel switching device for use in microwave systems. The device utilizes a switching mechanism based on nanoionics, in which mobile ions within a solid electrolyte undergo an electrochemical process to form and remove a conductive metallic "bridge" to define the change of state.The nanoionics-based switch has demonstrated an insertion loss of ~0.5dB, isolation of >30dB, low voltage operation (1V), low power (~μW) and low energy (~nJ) consumption, and excellent linearity up to 6 GHz. The switch requires fewer bias operations (due to non-volatile nature) and has a simple planar geometry allowing for novel device structures and easy integration into microwave power distribution circuits.

The finite-difference time-domain (FDTD) method is a widely used numerical technique for computer-aided design (CAD) of printed antennas and arrays. This technique can accurately predict performance characteristics of complex microstrip antennas, including the effects of parasitic elements and aperture-coupled feeds. In the case of arrays, mutual coupling effects between closely packed elements can also be modeled. This article will examine the advantages and limitations of the FDTD method for CAD of microstrip arrays. Calculated results are compared with experiment for a 3-patch coplanar parasitic patch array.

Notch antennas, also known as the tapered slot antennas (TSA), have been the topics of research for decades. TSA has demonstrated multioctave bandwidth, moderate gain (7–10 dB), and symmetric E ‐ and H ‐plane beam patterns and can be used for many different applications. This article summarizes the research activities on notch antennas over the since the early 1990s with emphasis on their most recent advances and applications. The article begins with some discussions on the design of single TSA, then follows with detailed discussions of issues associated with TSA designs and performance characteristics. To conclude the article, some recent developments in TSA arrays and their applications are highlighted.

No abstract

A new technique for exciting 2 × 2 subarray of linearly tapered slot antennas (LTSAs) with coplanar waveguide (CPW) is presented. rf power is coupled to each element through a CPW‐to‐slotline transition by a coax‐to‐CPW in‐phase four‐way radial power divider. The transition and the power divider are coupled by a novel nonplanar CPW right‐angle bend. Measured results at 18 GHz show excellent radiation patterns and return‐loss characteristics. © 1992 John Wiley & Sons, Inc.