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In recent years, wireless communications have progressed very rapidly and wideband and multi-band antenna designs have become very important for wireless applications. Several promising wideband antennas are suitable for applications in wireless local area network (WLAN) systems and worldwide interoperability for microwave access (WiMAX). Some monopole antennas for WLAN...

Orthogonal frequency division multiplexing (OFDM) is a multi-carrier transmission technique whose history dates back to the mid-1960s. Although the concept of OFDM has been around for a long time, it has only recently been recognized and adopted as an effective technique for high speed bi-directional wireless data transfer. WiMAX,...

All companies need to see increasing income year on year to please investors and to fund their growth. A mounting need for microwave design, combined with skilled worker shortages, make seamless growth challenging. As a result, engineers in rapidly growing companies are faced with increased workloads, more diverse work...

There has always been a critical need to measure and control RF power in wireless communication networks. Accurate measurement and control aids in the setting of overall cell coverage, and ensures that the RF power amplifiers in the wireless base station are operated for optimum thermal performance. In early...

Desktop milling machines for prototyping circuit boards have long been particularly helpful to microwave engineering development teams. Often a circuit or a critical part (filter, amplifier, coupler, etc.) needs to be designed quickly to keep the entire project on schedule. In many cases the desktop milling system can create...

With system space ever at a premium and operating frequencies constantly on the rise today’s RF/microwave interconnection cables must follow suit and be smaller and higher performance. One of the limiting factors to this progression has always been the cable connector. Its pin/socket-type male and female interconnect system adds...

The power density of large periphery III-N HEMTs can be as high as 5 W/mm, 1–3 much greater than GaAs (1 W/mm) and Si LDMOS (0.8 W/mm). These devices can generate more power per unit area of chip, or equivalent power in a much smaller package. All power that...

In recent applications of telecommunications and remote sensing at microwave frequencies, the exploitation of UWB antennas is steadily growing. 1 UWB radio can use the frequency band from 3.1 to 10.6 GHz. UWB systems also need to be compatible with other already existing standards. 2 To allow such a...

A great deal of attention has recently been paid to ultra-wideband (UWB) technologies for short-range and high data-rate wireless personal area networks (WPAN). By supporting data rates up to several hundred megabits per second (Mbps), these technologies are expected to be used in multimedia consumer electronic products in the...

A variety of commercial, governmental and military applications utilize the 4.40 to 4.99 GHz band. In the US and NATO countries, the 4.4 to 4.5 GHz band is designated for military fixed and mobile communications such as point-to-point microwave links and telemetry applications such as unmanned aerial vehicles (UAV),...