Adjustable filters are desirable when the amplitude or phase of a signal needs to be changed dynamically, using a controlling voltage or current. This article demonstrates a simple design, tested for use as a cheap phase-shifter for a phased-array application. As shown in the article about LCR jig for measurement
Signal generators for microwave bands are expensive and difficult to obtain, especially over the L Band. This frequency multiplier, based on harmonic generation and filtering, works with low part count, easily extending the maximum frequencies at home labs. A modern BFP420 BJT is used as a saturated amplifier, producing strong
Sometime ago, I started tests of zero-bias detectors as a side project, and it evolved in a full Microwave Power Meter system. The system is able to measure powers from -40dbm to 15dbm (55dB of input dynamic range) at frequencies from 100MHz to 6GHz (probably up to 10GHz). Articles about
As explained in the article about the RF Probe, the main task of the power meter device is the precise measurement of voltages over multiple decades, conversion to the calibrated measured value and control of the probe heater. In this article, we discuss the working principles of the front-end design
The final performance of the any metering equipment is primarily defined by the characteristics of the transducer device. For an RF power meter, the important attributes are power sensitivity, bandwidth and stability. The design of this probe is based around the simple Zero Bias Detector, with a Schottky diode as