A simplified analysis for high power microwave bandpass filter structures

Sivadas, A.; Yu, Ming; Cameron, Richard J.

doi:10.1109/mwsym.2000.862322

Cited by 17 publications

(11 citation statements)

References 3 publications

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“…Figure 4 shows the power-handling capability of the filter for different fractional bandwidths. As the ratio of the voltage at any resonator node to the input voltage (V 1 / V i , V 2 /V i ) is inversely proportional to the square root of the fractional bandwidth of the filter for a given center frequency [11], there is a linear relationship between the maximum allowable input power to the filter and its fractional bandwidth. To evaluate the dependency of the phase noise of the tunable filter to the input power, the input power must be chosen such that the filter does not enter breakdown region for a given fractional bandwidth.…”

Section: Power Handling Versus Bandwidthmentioning

confidence: 99%

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

Sekar

Entesari

2009

Int J RF and Microwave Comp Aid Eng

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The effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches is investigated in this article. It is shown that the phase noise of a tunable filter is dependent on the input power, fractional bandwidth, filter order, resonator quality factor, and tuning state. Phase noise is higher for filters with smaller fractional bandwidth. In filters with high fractional bandwidth (>3%), phase noise increases as the input power approaches the power-handling capability of the filter. In filters with smaller bandwidths, phase noise increases with input power upto a threshold level of input power, but begins to decrease thereafter. The unloaded quality factor of the filter has a noticeable effect on the phase noise of filters with narrow bandwidths. The phase noise changes with the filter tuning state and is maximum when all the switches are in the upstate position. It is also shown that the phase noise increases with the filter order, due to increase in the number of noisy elements in the filter structure. This article provides a methodology to evaluate the phase noise of a tunable filter and proves that RF MEMS filters are suitable for high performance applications without considerable phase-noise penalty.

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Section: Power Handling Versus Bandwidthmentioning

confidence: 99%

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

Sekar

Entesari

2009

Int J RF and Microwave Comp Aid Eng

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“…Due to this fact a lot of efforts are currently being put towards the accurate modelingr and prediction of multipaction risk in high power satellite components. For instance, in [2] a method was derived for the calculation of the peak voltages inside bandpass filters and multiplexers. In addition to the important conclusions derived from the study performed, two new filter topologies are proposed for critical multipaction applications.…”

Section: Introductionmentioning

confidence: 99%

“…where Vi> is the total voltage associated to the exciting mode in the structure, and the explicit dependence with the frequency of the VMF is shown in (2). The maximum power handling capabilities in the device can be obtained using the susceptibility voltage limit Vd05 proposed in [5].…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the integration in equation (1) must be extended alone each vertical line (whose length varies with the position alonu the x-axis). Once the maximum of the voltage has been computed using a variable height line integration, the VMF can be evaluated as in (2). An additional difficulty of the wedge waveguide is that the maximum of the field will not in general coincide with the maximum of the voltage.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Multipaction Phenomena in Passive Waveguide Filters for Space Applications

Pereira

Boria

Gimeno

et al. 2006

2006 IEEE MTT-S International Microwave Symposium Digest

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This paper presents an investigation on multipaction risk in microwave bandpass filters. The study reveals higher multipaction risk for narrower bandpass filters. To alleviate the problem with multipaction generation, different novel filtering structures are proposed. Results demonstrate that using the new structures multipaction risk can be reduced as much as 30% with regard to the initial design.

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“…The network is described using the nodal system of equations [11] Y.V=I and thus each transform is described by a set of rotations.…”

Section: Introductionmentioning

confidence: 99%

An Optimised Network Topology to Minimise E-Fields Occuring in Coaxial Resonator Filters

Senior

Hunter

Postoyalko

et al. 2002

32nd European Microwave Conference, 2002

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A demand for high power filters is met by a theoretical procedure to produce prototype networks designed to minimise peak voltages occuring due to stored energies in resonant cavities. The stored energies are re-distributed within the filter. This is in contrast to previous techniques which have looked at physical design methods to minimise breakdown in the various technologies used for realisation. Limitations are placed on the optimisations to ensure practical topologies are generated. A 4th Degree Chebychev coaxial resonator type filter is developed using the new procedure. The peak fields responsible for breakdown at high incident power levels are reduced. This allows greater power handling capacity when compared to conventional network topologies producing the same overall small-signal transfer function.A 4th Degree Chebychev filter is designed for implementation using coaxial resonator technology. Additional external couplings and cross-couplings are introduced to distribute the large stored energies from the second cavity into the fourth cavity. When compared to the ladder network significant reduction of peak voltages in the second cavity is obtained by increasing the level of peak voltage in the fourth to an equal value.

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A simplified analysis for high power microwave bandpass filter structures

Cited by 17 publications

References 3 publications

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

Investigation of Multipaction Phenomena in Passive Waveguide Filters for Space Applications

An Optimised Network Topology to Minimise E-Fields Occuring in Coaxial Resonator Filters

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