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In this paper, we propose and design a coaxial-line fed slot array with a waveguide-to-coaxial transition using a crank-shaped slot. We analyze the 8×8-element trapezoidal array with the designed transition. The bandwidth for VSWR less than 1.5 is 2.1% in the waveguide for boresight radiation and 2.0% in the waveguide for tilted radiation from 77 to 81 GHz.
By introducing a meander T-shaped feeding strip, a planar LTE/WWAN monopole antenna with eight-band operation is proposed for 4G tablet computers. The impedance bandwidths across dual operating bands approach 297 / 1323 MHz at the LTE / WWAN bands, respectively. The proposed planar monopole antenna has the antenna size of only 375 mm3. The measured peak gains and antenna efficiencies are approximately...
This paper presents the analysis of CPW-fed trapezoidal monopole antenna added with parasitic elements and slot. The U slot applied on trapezoidal patch to investigate the effects of slot geometrical altering to the notch and operation frequency.
Differential-signal transmission performances good noise immunity and low EMI characteristics benefiting from its symmetry architecture. While asymmetry occurs in the differential architecture due to process or other imperfect factors, these advantages forfeit and would cause more bit error rate to the communication system due to skew or mode conversion. In order to interpret the phenomenon and physical...
This paper presents performance enhancement of a conventional circularly-polarized (CP) microstrip patch array using anisotropic metasurfaces. In addition to boresight gain, axial-ratio and impedance bandwidth amplifications, sidelobe levels suppression were also focused.
This paper presents the analysis of CPW-fed trapezoidal monopole antenna added with parasitic elements and slots. From previous work, the proposed antenna altered by adding parasitic elements to enhance the operation bandwidth and achieved frequencies from 3.2GHz to 11.5GHz which covered Ultra Wide Bandwidth. This antenna is fabricated on FR4 for real measurement. Next experiment continues with slots...
This paper reviews the past and current research progress in microwave antenna applications using 2D planar metamaterials or metasurfaces. Firstly, we revisit the definitions of metamaterial and metasurface, and the applications of the ultra-thin metasurfaces for low-profile printed antennas in microwave frequency regime, for the purposes of size reduction and performance enhancement. Then we summarize...
This paper presents a compact-size co-planar waveguide (CPW) -fed antenna for ultrawideband (UWB) applications. The feeding structure of the proposed antenna is a fork-shaped type, and the ground plane is an open-loop type made of two L-shaped extended ground plane stubs. The size of this proposed antenna is only 26 × 20 × 0.8 mm3. The simulated 10-dB return loss bandwidth is 0.17 GHz (3.1-17.0 GHz),...
In this letter, a novel patch crossover is proposed for the millimeter-wave signal distribution and routing applications. Great simplicity can be found both in design and structure because the symmetrical circular patch with several metallic posts loaded along the edge is employed as the core part of the crossover. It's well known that the standard crossover is usually implemented by cascading two...
In this paper, a compact omnidirectional circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) is presented. The DRA is excited in its TM01δ mode by a probe located at the center, giving linearly polarized (LP) omnidirectional radiation patterns. Four interleaved strips serving as a wave polarizer are placed on the top of the DRA. By tuning the strips, the LP fields can be changed...
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