Spatial communication systems need antennas circularly polarized. In this article, we propose a new compact dual-frequency circularly polarized antenna. The two circular polarizations obtained in each frequency band are on opposite sense. This antenna is a patch of dimensions 36 ϫ 36 mm 2 , printed on duroid substrate. Left hand circular polarization and right hand circular polarization maximum gains are 6.46 dB at the low frequency and 7.14 dB at the high frequency. Theoretical total efficiency is about 91% in the two bands. Parametric study shows that each frequency band can be controlled separately and that circular polarization can be maintained in each band.
ABSTRACT: A novel design concept for implementing an antenna on a compact LTCC module is proposed for a Bluetooth application. The integrated antenna consists of an LTCC module and a two-layered radi-ating element, which occupies a volume of 5 mm ϫ 6.3 mm ϫ 0.8 mm. The antenna has a 7.5 dB return loss bandwidth of 100 MHz, from 2.39 to 2.49 GHz and has nearly omni-directional radiation patterns with good antenna gain in spite of its small size.
[2, 3] that requires high-frequency data fitting in CSB configuration. This indicates that the new technique results in an accurate extraction even in the LF range without any linear regression of high-frequency data. Although different configurations are used, extracted value of (13) agrees well with that of (16), justifying the R sub extraction accuracy. From these, it is found that R d ϭ 19 ⍀, R g ϭ 9 ⍀, and R sub ϭ 72 ⍀. The accuracy of these extracted resistances and capacitances is also verified in the saturation region under CSB configuration by observing an excellent agreement between modeled and measured S-parameters up to 20 GHz as shown in Figure 6.
CONCLUSIONA new and direct method to extract resistances and capacitances of the AC equivalent circuit of BSIM3v3 RF model is proposed to get rid of the extraction difficulties of previous ones using CSB configuration. This method is based on the combination of two equivalent circuits arranged from CSG and CSD configurations at zero bias. Good agreement between modeled and measured Sparameters under CSB configuration is achieved up to 20 GHz, demonstrating the extraction accuracy.
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