A reconfigurable bandpass filter for RF/microwave multifunctional systems

Fathelbab, Wael M.; Steer, M.B.

doi:10.1109/tmtt.2005.843502

Cited by 47 publications

(14 citation statements)

References 11 publications

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“…To accommodate multiple radio standards with different bandwidths and modulation schemes, multi-mode lowpass filters need to compromise bandwidth, center frequency, selectivity, and group delay for optimal dynamic range and power consumption [22][23][24]. To accommodate multiple radio standards with different bandwidths and modulation schemes, multi-mode lowpass filters need to compromise bandwidth, center frequency, selectivity, and group delay for optimal dynamic range and power consumption [22][23][24].…”

Section: Multi-mode and Adaptive Rf Circuit Designmentioning

confidence: 99%

Adaptive Multi‐Mode RF Front‐End Circuits

Hueber

Staszewski²

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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Section: Multi-mode and Adaptive Rf Circuit Designmentioning

confidence: 99%

Adaptive Multi‐Mode RF Front‐End Circuits

Hueber

Staszewski²

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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“…This technology could increase the frequency range over which passive microstrip devices (such as filters) useful, since tuning technology would enable precise placement of poles and zeros and thus allow greatly enhanced control over the bandpass or bandstop characteristics[l6,17]. At a more advanced level, tuning technology could enable device reconfiguration-a highly desirable feature for emerging applications such as software defined radio (SDR) [18].…”

Section: Designmentioning

confidence: 99%

Tunable Microstrip Filters Using Selectively Etched Ferroelectric Thin-Film Varactors for Coupling

Miranda

Mueller

Keuls

et al. 2010

Integrated Ferroelectrics

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We report on the use of patterned ferroelectric films to fabricate proof of concept tunable one-pole microstrip filters with excellent transmission and mismatch/reflection properties at frequencies up to 24 GHz. By controlling the electric field distribution within the coupling region between the resonator and inputloutput lines, sufficiently high loaded and unloaded Q values are maintained so as to be useful for microstrip filter design, with low mismatch loss. In the 23 -24 GHz region, the filter was tunable over a 100 MHz range, the loaded and unloaded Q values were 29 and 68, respectively, and the reflection losses were below -16 dB, which demonstrates the suitability of these films for practical microwave applications.

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“…Furthermore, experimental results of a second-order microstrip dual-band filter prototype for the 0.9/1.8-GHz bands have also been shown, hence proving the practical viability of the presented topology. Finally, note that the great tuning possibilities of combline-type filter arrangements in terms of center frequency [13], bandwidth [14], and even selectivity [15] open the way towards the design of tunable multi-band filters as further research on this topic. …”

Section: B Inter-resonator Couplingmentioning

confidence: 99%

Microwave combline-type dual-passband filter

Sánchez‐Renedo

Gómez‐García

2007

2007 European Microwave Conference

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A dual-passband microwave filter topology based on a combline-type arrangement is presented in this paper. The described structure is made up of dual-band resonators formed by the parallel connection of two line segments grounded at one extreme and ended in a lumped capacitor at the opposite edge. The theoretical analysis of the proposed dual-band combline resonator is detailed. Moreover, guidelines for the suitable feeding and coupling of this type of resonator in dual-passband filtering applications are discussed. To validate the concept, simulation and measurement results of a manufactured filter prototype in microstrip technology are also given. I. INTRODUCTIONModern trends towards the development of multifunction high-frequency systems, capable of supporting multiple standards at the same time [e.g., global system for mobility (GSM) and code division multiple access (CDMA) mobile cell phone services operating at around 0.9 GHz and 1.8 GHz, or wireless local area network (WLAN) applications at both the 2.4-GHz and 5.2-GHz bands] have motivated the research into circuits demonstrating multi-band operation capabilities. As a result of its immediate need, this effort has been mainly focused on double-band specifications through the design of a large variety of RF and microwave dual-band subsystems; among them, low-noise amplifiers [1], mixers [2], oscillators [3], antennas [4], or even full transceiver architectures [5].Since dual-band transmitter and receiver modules inherently need for the selection of two different passbands at some chain point, most of the attention has been on the development of dual-passband microwave filters. In this area, a great number of solutions, approached from both the conceptual (i.e., invention of novel circuit topologies in classic technologies [6]-[9]) and technological [10], [11] perspectives have been proposed.The simplest way to design a dual-passband filter was shown in [6], by properly cascading a stopband and a wide bandpass filter to conform the two desired passbands. Here, the main drawbacks are an inter-band spectral separation limited by the maximum achievable bandwidth for the wide-band filter and the excessive circuit size resulting from the connection of two high-order filters in high-selectivity situations. Lately, other compact dual-band filter structures developed in planar technologies have been proposed, such as arrangements based on double parallel-stub resonators [7], stepped-impedance resonators [8], or split-ring resonators [9]. These solutions have allowed the aforementioned difficulties to be partially circumvented, but with a trade-off between design complexity and degree of flexibility in the second passband performances. On the other hand, emerging technologies, such as those employing low-temperature co-fired ceramic (LTCC) or liquid crystal polymer (LCP) substrates, have also proven to be useful in the design of very small dual-passband filters (e.g., [10], [11]). Nevertheless, the results reported by some of these works reveal that further research...

show abstract

A reconfigurable bandpass filter for RF/microwave multifunctional systems

Cited by 47 publications

References 11 publications

Adaptive Multi‐Mode RF Front‐End Circuits

Adaptive Multi‐Mode RF Front‐End Circuits

Tunable Microstrip Filters Using Selectively Etched Ferroelectric Thin-Film Varactors for Coupling

Microwave combline-type dual-passband filter

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