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A direct synthesis method of microwave multi-passband filters is discussed in this paper. Different from the classical synthesis technology, this method does not require the frequency transformation or polynomial optimization, directly and separately synthesizes generalized Chebyshev characteristic function of each passband in band-pass domain, the final multiband filtering function obtained, which...
A novel synthesis technique which can arbitrarily place transmission zeros, directly synthesize in band-pass domain without a low-pass prototype transformation for generalized Chebyshev microwave band-pass filters is discussed in this paper. Compared with the classical synthesis theory for narrowband filters, this method can reduce the relative error generated in the frequency transformation and apply...
This paper presents the design methods of microwave filter with resonant windows instead of traditional cavity resonator. A equivalent circuit model with parallel resonator and the resonant irises as resonator is shown. And then, a Chebyshev filter without transmission zeros is designed. In this filter, the main coupling is achieved by quarter-wavelength waveguide, and there is not cross-coupling...
This paper introduces one new method to synthesize S parameters' polynomials of dual-passband filters, which have two passbands separated by one stopband. Both symmetric and asymmetric dual-passband filters can employ this method. A serial of optimization procedures were carried on to optimize one function with the band edges of stopbands as variables. The band edges of stopbands have their own ranges...
For GPS positioning, it is normally required that there be at least four GPS satellites in view. However, due to the frequent blockage of signals in an urban environment, it is difficult to meet that requirement; therefore, the operation of the GPS receiver may be interrupted. How to deal with this problem so that the service can be continuous is the main theme of this paper. The pseudorange predictor...
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