Integrated Tunable RF Filter for TV Reception [42MHz..870MHz]

Bouhamame, M.; Amiot, S.; Crand, O.; Lococo, L.; Paris, Jean‐Marc; Kristen, M.; Tourret, J.R.; Pruvost, X.; Toutain, S.

doi:10.1109/icecs.2007.4511121

Cited by 1 publication

(1 citation statement)

References 6 publications

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“…FH filters are often used in multiband telecommunication systems, radiometers, and wideband radar systems, and typically based on different technologies such as: 1) mechanically tuning [1,2]; 2) barium strontium titanate (BST) thin film technology [3]; 3) yttrium-iron-garnet(YIG)-based resonators [4]; 4) RF micro-electromechanical systems (RF-MEMS) devices [5]; 5) semiconductor (silicon, ferroelectric, GaAs) varactors [6,7]; 6) LC elements [8]. However, none of the approaches can meet the requirement of VHF FH filters with high power handling capability and high linearity.…”

Section: Introductionmentioning

confidence: 99%

High Power VHF Frequency-Hopping Filters With High Suppression of Second Harmonic

Zhao¹,

Li²,

Kun-lun³

et al. 2011

PIER Letters

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A compact helix structure implementation and associated design formula of lumped element second-order bandpass filter circuit for high power frequency-hopping (FH) filter are proposed in this paper.The filter schematic provides one, two or three finite transmission zeros (Tzs), and these Tzs locate in the upper stopband to improve the rejection of stopband above the center frequency, especially the suppression of second harmonic with two Tzs. The filter is built on a common grounded helix coil of inductive coupled resonator tanks whose suspectance is tunable. Due to the parasitical capacitance of the helix coil, the filter has a feedback capacitor between input and output. Its working mechanism is revealed both mathematically and graphically. The measured results have a good agreement with the 3D full-wave electromagnetic simulation responses. The experimental filter has an insertion loss < 1.2 dB, a return loss > 15 dB, a 3-dB bandwidth of 5.8% ∼ 8.3% over entire operating range with the power handling capability greater than 49 dBm and the suppression of second harmonic better than 66 dB.

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