Two novel classes of band-reject filters realizing broad upper pass bandwidth

Fathelbab, Wael M.; Jaradat, Hamzeh M.; Reynolds, Daniel B.

doi:10.1109/mwsym.2010.5515673

Cited by 1 publication

(2 citation statements)

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“…5 to form novel coupled-line sections in an effort to develop practically realisable microwave structures. This is done in a similar fashion as previously presented in [7,13,17,18]. To this end, we re-visit the network model of a pair of coupled lines in a homogenous [7] media as illustrated in Figs.…”

Section: Novel Reconfigurable Coupled-line Band-reject Sections and Tmentioning

confidence: 99%

“…To this end there has been a lot of research that is mainly focused on the design of tunable and/or reconfigurable bandpass filters utilising different tuning technologies [1][2][3][4][5]. Band-reject filters [6][7][8][9][10][11][12][13][14][15][16][17][18] are also a class of filters required to suppress known interfering signals to protect receivers from malfunctioning or being driven into saturation. It is the objective of this paper to introduce novel classes of band-reject filters that lend themselves to be reconfigured between two distinct centre frequencies while achieving constant absolute bandwidth in each state.…”

Section: Introductionmentioning

confidence: 99%

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Classes of reconfigurable band‐reject filters realising constant absolute bandwidth in two distinct states

Fathelbab

2015

IET Microwaves, Antennas & Propagation

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This study presents the synthesis and design of novel band‐reject filters whose frequency characteristics can be reconfigured between two distinct states, each of which is centred at a different resonant frequency. The absolute bandwidth of the reconfigurable filters in the two distinct states is maintained constant by virtue of introducing two new resonator types which are thoroughly studied and analysed in this work. The synthesis of two prototype networks realising a common electrical specification is illustrated and each network is subsequently transformed into two types of band‐reject filters comprising novel coupled‐line sections. The presented circuit concepts are then validated through the simulation of a suspended‐substrate stripline filter modelled utilising high frequency structure simulator (HFSS) which realises an absolute bandwidth of 200 MHz in the two distinct states centred at 1180 and 1485 MHz. The HFSS filter model is manually reconfigured between the two distinct states upon terminating stubs within each of its resonator structures as either open circuit or short circuit. The performance of the HFSS filter model shows close correspondence to the performance of the synthesised prototype network, thus demonstrating the validity of the proposed circuit principles.

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Section: Novel Reconfigurable Coupled-line Band-reject Sections and Tmentioning

confidence: 99%