Broadb and planar antennas chen zhi ning chia michael yan wah. Zhi Ning Chen Inventions, Patents and Patent Applications 2019-03-17

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Plasmon Hybridization in Stacked Cut‐Wire Metamaterials

broadb and planar antennas chen zhi ning chia michael yan wah

Preferably, the probe-like feeding structure 506 is balanced and configured to feed the suspended plate antenna symmetrically about the center of the plate radiator 502. Variations of the plate radiator 102 may be used. As a further example, better radiation performance is achieved for suspended plate antennas according to embodiments of the invention. For purposes of brevity, only the structures of the plate radiator 102 and the ground plane 104 are described in detail. The probe feed 410 and the ground wall 412 may be completely or partially separated by foam, or any other infinitely- or finitely-sized dielectric material 416 that is inserted into the space between the probe feed 410 and the ground wall 412. As a result, the impedance bandwidth is increased.

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Zhi Ning Chen Inventions, Patents and Patent Applications

broadb and planar antennas chen zhi ning chia michael yan wah

The improved radiation is equivalent to the radiation from an ideal electric current distribution on a plate radiator without a slot as shown in Fig. In this instance, the probe-type feeding structure 306 is a microstrip line fed by a probe feed 310 that is spaced apart from and in parallel with a ground wall 312 as shown in Figs. The antenna as in claim 1, wherein the slot is symmetrical about at least one midline of the plate radiator. Based on the foregoing design concept, the feeding methods are provided to ameliorate the radiation performance of the suspended plate antennas within the broad impedance pass-band, in which only one balanced or balanced-like feeding structure with simple feeding network is used. Also, the longer and shorter sides of both the inverted-L probe feed 610 and inverted-L ground wire 612 are coplanar. The method as in claim 11, wherein the step of providing the cut slot includes the step of providing a cut slot which is symmetrical about at least one midline of the plate radiator.

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Plasmon Hybridization in Stacked Cut‐Wire Metamaterials

broadb and planar antennas chen zhi ning chia michael yan wah

Each of the probe feed 410, and ground wall 412 and ground strips 413, is connected to each of the pair of feed points 418 for symmetrically feeding the plate radiator 402. A pair of feed points 418 are present on the plate radiator 402, each feed point 418 being located at the center of and proximal to the edge of each of the longer sides of a rectangular slot 408 cut in the center of the plate radiator 402 as described in the foregoing manner for the first embodiment. Applications: mainly highlights the latest the applications of antennas in all wireless systems ranging from communication, radar, imaging, and sensing systems for life styles including personal communications, entertainments, biology, healthcare, medicine, education, and so on, as well as defence and industry transportation, power grid, energy, broadcasting, space, maritime applications. He is the recipient of several international and local Best Paper Award and Engineering Achievement Award. The plate radiator 102 may be completely or partially supported by electrically thin or thick air, foam, or any other infinitely- or finitely-sized dielectric material which is inserted into the space between the plate radiator 102 and the ground plane 104. The antenna as in claim 9, wherein the space between the plate radiator and the ground plane is filled with dielectric material. For example, dual-polarization base stations usually require planar antennas with high polarization purity.

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LOW CROSS

broadb and planar antennas chen zhi ning chia michael yan wah

The resultant radiation performance of the respective antenna is improved within a broad well-matched pass-band. Preferably, the probe-type feeding structure 406 is balanced and configured to feed the suspended plate antenna symmetrically about the center of the plate radiator 402. The balanced feeding structures are preferably used to symmetrical feed the suspended plate antennas and microstrip patch antennas as well as to suppress cross-polarization levels in the H-plane and improve the radiation patterns in the E-plane within a broad well-matched pass-band. This drawback therefore severely limits the scope of practical applications of broadband suspended plate antennas. Summary In accordance with a first aspect of the invention, a suspended plate antenna for broadband applications is provided. The balanced feeding structure of the fifth embodiment is described in greater detail with reference to Figs. The balanced feeding structure of the second embodiment is described in greater detail with reference to Figs.

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Plasmon Hybridization in Stacked Cut‐Wire Metamaterials

broadb and planar antennas chen zhi ning chia michael yan wah

In this instance, the probe-type feeding structure 506 is a balance feeding system 506 that consists of a pair of parallel probe feeds 510, each of which carries signal being completely 180° out of phase with signals carried by the other, as shown in Figs. Each of the probe feed 310 and ground wall 312 is connected to each of the pair of feed points 318 for symmetrically feeding the plate radiator 302. A second supplement strip is provided on the backside of the printed circuit board which provides the second resonance at the 2. Furthermore, the unwanted radiation resulting from the higher order modes is canceled out well because the induced cross-polarized electric currents mainly exist near the slot. Urzhumov, Hui Wang, Janardan Kundu, Naomi J.

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Characterization of ultrawideband antennas using transfer functions

broadb and planar antennas chen zhi ning chia michael yan wah

The front, side and bottom elevations of a rectangular suspended plate antenna according to a first embodiment of the invention are shown in Figs. As another example, feeding methods for suspended plate antennas are provided. David Wright, Design of practicable phase-change metadevices for near-infrared absorber and modulator applications , Optics Express , 10. The low costs inherent in manufacturing ease and inexpensive materials usage in relation to antennas usually attract, and therefore encourage, industrial applications of such antennas. The balanced feeding structure of the third embodiment is described in greater detail with reference to Figs. This is because the effect of such slots on current distributions at the plate radiators is reduced and as a result the higher order modes are to some degree suppressed. Preferably, the probe-type feeding structure 206 is balanced and configured to feed the suspended plate antenna symmetrically about the center of the plate radiator 202.

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Dual elliptically tapered antipodal slot antenna loaded by curved terminations f

broadb and planar antennas chen zhi ning chia michael yan wah

The balanced feeding structure is further preferably a pair if inverted-L feeding strips 606 as shown in Figs. A variety of matching techniques is introduced to these planar antennas for realising good matching conditions in broadband applications. Nash, Hasan Hayat, Martin J. The method as in claim 19, wherein the step of providing the ground plane further includes the step of providing the ground plane wherein the space between the plate radiator and the ground plane is filled with dielectric material. There are a number of attendant advantages associated with the embodiments of the invention described hereinafter.

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Dual elliptically tapered antipodal slot antenna loaded by curved terminations f

broadb and planar antennas chen zhi ning chia michael yan wah

In accordance with a second aspect of the invention, a method for feeding a suspended plate antenna for broadband applications is provided. A pair of feed points 218 are present on the plate radiator 202, each feed point 218 being located at the center of and proximal to the edge of each of the opposing longer sides of a rectangular slot 208 cut in the center of the plate radiator 202 as described in the foregoing manner for the first embodiment. The method comprises the steps of providing a plate radiator and a ground plane, providing a slot cut in the plate radiator, and using a substantially balanced feeding structure for symmetrically feeding the plate radiator with respect to and close to the center of the plate radiator. The antenna as in claim 1, further including a ground plane above which the plate radiator is suspended. The information provided in Table 2 suggests that a broadband suspended plate antenna equipped with a feeding structure according to an embodiment of the invention is more attractive in the context of industrial applicability. To afford wireless communication devices with mobility and allow for sectorization of wireless communication base station antennas, compact antennas are typically required. The feeding points 1 and 2 are located along midline B-B' and symmetrical about midline A-A'.

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