This paper presents a new method of electronic tuning, i.e. frequency modulation of dielectric resonator oscillators. The method is based on perturbing the field above the dielectric resonator. A preliminary model showed a frequency shift of more than 40MHz at approximately 16GHz, with a keying rate higher than 20Mb/s. Application of analog frequency modulations is also possible. 

An accurate synthesis method is described for designing GaAs MESFET oscillators, which needs no complex large signal characterisation of the device. A graphic derived from a formula approximating the saturation characteristic of GaAs MESFET helps compute expected oscillator output power. It is assumed, that only |S21| is affected at large signal levels. The embedding networks are computed using th

This paper presents a series of calculating formulas for the optimal PLL bandwidth of a phase-locked microwave oscillator. The derivations of these formulas are according to the fact that the noise spectral densities of VCO are various possible distributions and the noise spectral density of the reference source is white PM. The experimental adjustment method of the optimal PLL bandwidth and its r

ABSTRACT: A 12GHz DBS receiver with 800MHz European DBS Bandwidth for mass-production has been designed. In this paper, configurations and design feature for mass-productivity and low-cost design of the low noise converter (LNC) and the FM demodulator unit (FMD) of the receiver are described. As the performance of LNC, a noise figure of 2.5dB (typical) and a gain of 54dB have been achieved ov

A new generation of sensors using microwaves should be derived from the classical concept of correlation. These systems are possible to be made with quite simple components (patch antennas, hybrid coupler, diodes or dual gate FET) ; they should concern applications devoted to telemetry, cinemometry and goniometry. 

A fast ALC amplifier for burst-to-burst amplitude equalization in Satellite Communication TDMA is described. Some considerations are also provided concerning the definition of the optimum loop bandwidth in actual systems. 

Two different high-power multiplexer module designs and prototypes suitable for 17-GHz direct-broadcast satellite earth stations are presented and compared. One of the units uses circular TE011 cavity mode filters and the other uses circular tests performed TE114 dual-mode filters. units are given, TE011 The results of high-power with the performance of a on both together triplexer construc

A high-power output multiplexing network suitable for direct broadcast" satellite (DBS) applications was designed, manufactured, and tested to full space qualification requirements. Extensive tradeoff studies of the multiplexer electrical characteristics and thermal/mechanical performance were conducted to achieve the design objectives of minimum insertion loss, low weight and volume, and thermal

This paper describes the synthesis and realization of a 12-GHz microwave filter which combines the properties of excellent frequency selectivity with a rounded in-band response and flat group delay. The filter is particularly suitable for use as a receive filter in a regenerative transponder where matched response to a PSK-modulated carrier is necessary to minimize bit error degradation. 

Highly accurate mode matching theory is applied to optimize ring-shaped dielectric resonators with respect to spurious mode separation. Effects of a supporting substrate and the conductive shieldings ar& taken into account. For one optimized resonator field plots for the lowest order circularly symmetric resonant modes, TEOl6 and TM016 and lowest order ' hybrid modes, EHl16 and HEllS' are given. U