This paper presents a new reconfigurable antenna based on coplanar waveguide (CPW). The design for reconfigurable antenna is based on monolithic microwave integrate circuit (MMIC). This scheme combines a CPW antenna and switchable resonator radio frequency micro-electromechanical system (RF-MEMS). The resonator RF-MEMS presents a meander inductor structure and tuning capacitor controlled by the...

A high-linearity and high-efficiency MMIC power amplifier is demonstrated adopting a new on-chip adaptive bias circuit, which improves efficiency at the low output power level and linearity at the high output power level automatically. The intelligent two-stage W-CDMA power amplifier using the newly proposed adaptive bias circuit extends the maximum linear output power of 0.6dB and exhibits an ...

Microwave technology plays a more important role in modern industrial sensing applications. Pushed by the significant progress in monolithic microwave integrated circuit technology over the past decades, complex sensing systems operating in the microwave and even millimeter-wave range are available for reasonable costs combined with exquisite performance. In the context of industrial sensing, t...

Introduction: Multi-throw switches are widely used in microwave circuits for switch matrices and true-time-delay phase shifting applications. Traditionally, the multi-throw switch uses GaAs MESFETs and pin diodes to perform its switching function. It exhibits good performances at low frequencies, but deteriorates in the high frequency range beyond 1 GHz [1]. On the other hand, the monolithic mi...

In low frequency astronomy « 300 MHz), antennas used to collect radiation from the sky; function like short dipoles (1« )./2) over an appreciable range of wavelengths. Since the short dipoles do not possess appreciable impedance matched bandwidth for 50 [2 systems, coupling of sky radiation to amplifiers connected to the output of antennas will be highly inefficient over a substantial portion o...

For the first time, a new circuit to extend the linear operation bandwidth of a LTE (Long Term Evolution) power amplifier, while delivering a high efficiency is implemented in less than 1 mm2 chip area. The 950 µm × 900 µm monolithic microwave integrated circuit (MMIC) power amplifier (PA) is fabricated in a 2 µm InGaP/GaAs process. An on-chip analog pre-distorter (APD) is designed to improve t...

This paper describes the requirements of the antennas or antenna systems in recent high-speed and high-capacity wireless communication systems and the key technologies for satisfying them. It also explains the antennas and antenna systems being researched and developed for next-generation wireless communication systems. The antenna in such a system requires high gain, high-efficiency antenna el...

To achieve radio frequency (RF) power detection, gain control, and circuit protection, this paper presents n⁺ GaAs/AuGeNi-Au thermocouple-type RF microelectromechanical system (MEMS) power sensors based on dual thermal flow paths. The sensors utilize a conversion principle of RF power-heat-voltage, where a thermovoltage is obtained as the RF power changes. To improve the heat transfer efficienc...

This article reports on the first demonstration of distributed amplifier monolithic microwave integrated circuits (MMICs) with a bandwidth (BW) more than 300 GHz. The three presented utilize uniform traveling-wave topology six, eight, and ten unit cells, respectively. In this article, impact connection between gate line transistors achievable performance is investigated. It demonstrated that sh...

Simulation in the frequency-domain avoids many of the severe problems experienced when trying to use traditional time-domain simulators such as Spice [1] to find the steady-state behavior of analog, RF, and microwave circuits. In particular, frequency-domain simulation eliminates problems from distributed components and high-Q circuits by forgoing a nonlinear differential equation representatio...