A Dual-Frequency Feed with Electronic Tracking Capability
نویسندگان
چکیده
A dual-frequency Q-/K-band circularly polarized feed with electronic tracking capability was developed. Four circumferentially located, externally coupled, diode controlled, resonant cavities were used at the horn throat to produce phase-center lateral movement. When used to feed a 24-in-diam. offset paraboloidal reflector, an average beam squint from boresight of 10 percent of the 3-dB beamwidth was obtained over a 5-percent bandwidth.
منابع مشابه
Frequency tracking and stabilization of a tunable dual-wavelength external-cavity diode laser
We show a unique dual-wavelength external-cavity laser diode with frequency tracking capability and obtain a stable beat frequency between the dual-wavelength output. By using a Fabry–Perot interferometer as the frequency discriminator and the time-gating technique in a servo loop, the peak-to-peak frequency fluctuations were stabilized, with respect to the Fabry–Perot cavity, to 86 kHz in the ...
متن کاملHigh Performance Synchronous Buck Controller with DCR Current Sensing
The LM27402 is a synchronous voltage mode DC/DC buck controller with inductor DCR current sense capability. Sensing the inductor current eliminates the need to add resistive powertrain elements which increases overall efficiency and facilitates accurate continuous current limit sensing. A 0.6V ±1% voltage reference enables high accuracy and low voltage capability at the output. An input operati...
متن کاملHigh Performance Dual Circularly Polarized S- Band Feed
A high performance feed for 11 meters dual shaped reflector system is designed, developed and tested. It is a dual circularly polarized monopulse tracking feed with a measured axial ratio of 0.5dB over the required frequency band of 2GHz to 2.3GHz (Uplink: 2.02GHz -2.12GHz, Downlink: 2.2GHz-2.3GHz). This feed consists of four high performance Teflon dielectric radiating elements. Each dielectri...
متن کاملSliding Mode Control For Heartbeat Electrocardiogram Tracking Problem
In this paper, we have exploited the first-order sliding mode control method to track the ECG data of the human heart by three different nonlinear control laws. In order to lessen the intrinsic chattering of the classic sliding mode control system, smooth function approximations of the control input, by means of the hyperbolic tangent and the saturation function, were used. The fast Fourier tra...
متن کاملImplementation of Fuzzy Self-Tuning PID and Feed-Forward Design for High-Performance Motion Control System
The existing conventional motion controller does not perform well in the presence of nonlinear properties, uncertain factors, and servo lag phenomena of industrial actuators. Hence, a feasible and effective fuzzy self-tuning proportional integral derivative (PID) and feed-forward control scheme is introduced to overcome these problems. In this design, a fuzzy tuner is used to tune the PID param...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2010