When trying to satisfy the requirem

When trying to satisfy the requirements in Table I, a possible choice consists in the combination of two antenna
modules used to separately match specifications in the two regions of interest, namely the radiative and reactive nearfield
regions (Fig. 1). The first module is a TWA (namely, a transmission line designed to increase the field on the
antenna surface with respect to a conventional low losses microstrip or CPW transmission line). A spiral or a
meandered structure is preferred to uniformly distribute the EM energy among all the field components [14]-[15]. The
TWA module has to be located in the middle of the reader antenna surface, which represents a premium location since it
is the region where a tagged item is more likely to be located. The region surrounding the TWA antenna can be used toplace one or two resonating antennas that are supposed to cover the radiative near-field region with a circularly
polarized field. Since most of the antenna surface has to be devoted to the TWA antenna, resonating antenna module
has to be realized with miniaturized antennas. It is worth noting that the miniaturization helps to meet the requirement
on low antenna gain. As an example, two possible configurations are sketched in Fig. 1. ANT1 is a TWA whose end is
connected to a resonating antenna that could be a loop-like antenna (Fig. 1a) or a broadside array made of two
miniaturized CP patches (Fig. 1b). Differently by TWAs closed on a matched load [14]-[18], in the proposed
configuration the power at the end of the lossy transmission line is used to radiate a field contribution in the radiative
near-field region. Moreover, the series-feeding helps to get a very low reflection coefficient at the antenna input, so
allowing a simpler design able to match requirements on the allowable antenna size. Depending on the particular
application, it is possible to optimize the radiating elements typology as well as their position on the antenna surface.
The degrees of freedom available in the proposed layout allow the antenna designer to easier meet most of the
requirements for desktop reader antennas; also, the proposed modular antenna can be easily scaled to fit with reader
cases of disparate size. The orientation and layouts of the two antenna modules have to be chosen by considering that
the mutual coupling between the radiators sharing the antenna surface is not negligible, as the radiating elements will be
close to each other and operate at the same frequency band. Moreover, miniaturized antennas usually are narrow band
antennas, and this will make difficult to design reader antenna covering both ETSI and FCC
(a)

ผลลัพธ์ (อังกฤษ) 2:

When trying to Satisfy the requirements in Table I, a possible combination of Choice consists in the Two Antenna
modules used to separately Match Specifications in the Two Regions of interest, namely the radiative and reactive Nearfield
Regions (Fig. 1). The First Module is a TWA (namely, a Transmission line designed to increase the field on the
Antenna surface with respect to a conventional microstrip or CPW low losses Transmission line). A Spiral or a
meandered structure is Preferred to uniformly distribute the EM Energy field among all the components [14] - [15]. The
TWA Module has to be located in the MIDDLE of the Reader Antenna surface, which represents a premium since it Location
is the Region where a Tagged item is more likely to be located. The Region Surrounding the TWA Antenna Can be used Toplace one or resonating Two Antennas that are supposed to Cover the radiative near-field Region with a circularly
Polarized field. Most of Antenna since the surface has to be Devoted to the TWA Antenna, resonating Antenna Module
has to be realized with miniaturized Antennas. It is Worth noting that the miniaturization helps to Meet the requirement
on low gain Antenna. As an example, two possible configurations are sketched in Fig. 1. ANT1 is a TWA whose End is
Connected to a resonating Antenna Antenna that could be a loop-like (Fig. 1A) or a Broadside array Made of Two
miniaturized CP patches (Fig. 1B). Differently by TWAS Closed on a matched Load [14] - [18], in the Proposed
Configuration the Power at the End of the lossy Transmission line is used to Radiate a contribution in the field radiative
near-field Region. Moreover, the Series-feeding helps to Get a very low coefficient Reflection at the Antenna input, so
allowing a simpler Able to Match Design requirements on the Allowable Antenna Size. Depending on the particular
Application, it is possible to Optimize the Radiating Elements typology as well as their position on the Antenna surface.
The Degrees of Freedom Antenna available in the Proposed layout Allow the designer easier to Meet Most of the
requirements for Desktop Reader Antennas; also, the Proposed modular Antenna Can be easily Scaled to Fit with Reader
Cases of disparate Size. Layouts and the orientation of the Two Antenna modules have to be Chosen by considering that
the Mutual coupling between the radiators Antenna Sharing the surface is not negligible, as the Radiating Elements Will be
close to each Other and operate at the Same frequency band. Moreover, miniaturized Antennas are usually Narrow band
Antennas, and this Reader Antenna Design Will Make difficult to covering both ETSI and FCC
(a).