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- W1992664980 abstract "<para xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> This paper presents a front-end passive circuit module for ZigBee applications using low-temperature co-fired ceramic technology. The front-end part consists of an antenna, a bandpass filter, a switch, and two baluns. In antenna design, the solenoid shape is employed for reducing the size of the antenna, resulting in an overall size of <formula formulatype=inline><tex>${hbox {9}}times {hbox {16.4}}times {hbox {1.82}} {hbox {mm}}^{3}$</tex></formula> and a gain of <formula formulatype=inline><tex>$-$</tex></formula>1.4 dBi. As for the filter, two types of filters are suggested. First, the lumped-type filter employing a high-<formula><tex>$Q$</tex></formula> spiral inductor has more than 20-dB attenuation at both stopbands, very near to the passband. Secondly, the semilumped-type filter adopting an edge coupled line and a loading capacitor provides a group delay of below 5 ns and is adequate for the full module structure due to the structure flexibility. A balun is evaluated using lumped components instead of a transmission line and, thus, it provides an insertion loss of only 0.3 dB and a phase difference of 180<formula formulatype=inline> <tex>$^{circ}$</tex></formula> between balanced signals. Based on these components, an RF front-end module including attaching pads for an RF integrated circuit (IC) and baseband IC is implemented. In case of using the lumped-type filter, the insertion loss of the front-end module is 6.5 dB, and the group delay is below 7 ns. In case of adopting the semilumped-type filter, the insertion loss is 6.2 dB, and the group delay is below 4 ns. The overall size of the former and latter is <formula formulatype=inline><tex>${hbox {25.14}}times {hbox {28.5}}times {hbox {0.68}} {hbox {mm}}^{3}$</tex></formula> and <formula formulatype=inline><tex>${hbox {25.66}}times {hbox {25.58}}times {hbox {1.17}} {hbox {mm}}^{3}$</tex></formula>, respectively. </para>" @default.
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- W1992664980 date "2007-05-01" @default.
- W1992664980 modified "2023-09-23" @default.
- W1992664980 title "RF Front-End Passive Circuit Implementation Including Antenna for ZigBee Applications" @default.
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- W1992664980 doi "https://doi.org/10.1109/tmtt.2007.895651" @default.
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