Browsing by Author "Lin, Lieh-Chuan"

Now showing 1 - 6 of 6

Broadband Inverted-T Leaky-wave Antennas
(2008)
Lin, Lieh-Chuan
;
Kitazawa, Toshihide
;
Lin, Yu-De
;
交大名義發表
;
National Chiao Tung University
Characterization and design of cylindrical microstrip leaky-wave antennas
(2008-07-01)
Lin, Lieh-Chuan
;
Miyagawa, Hayato
;
Kitazawa, Toshihide
;
Hwang, Ruey Bing
;
Lin, Yu-De
The spectral-domain approach is applied for the analysis and the design of the cylindrical microstrip leaky-wave antenna. The first higher-order leaky-mode is thoroughly investigated. We perform the well-known spectral-domain approach and Galerkin's method to acquire the complex propagation constants of leaky modes, which are verified with results obtained by the scattering-parameter extraction technique. Two practical antennas are designed and implemented. Measured return loss and radiation patterns show a good performance of these cylindrical antennas, compared to that of the planar ones.
Circularly Polarized Slotted Conductor-backed Coplanar Waveguide (CBCPW) Antenna Array with Sequentially Rotated Feeding Structure
(2009)
Lin, Yow-Shyan
;
Lin, Lieh-Chuan
;
Kitazawa, Toshihide
;
Lin, Yu-De
;
電信工程研究所
In this paper, circularly polarized slotted antenna arrays on conductor-backed coplanar waveguide (CBCPW) operating at Ku band are proposed. Radiating slots along the propagation direction of the parallel-plate mode in the CBCPW structure are etched to radiate into the air. By appropriately arranging the position and tilt angle for each slot, we can implement a kite-shaped linearly polarized antenna array with high gain and narrow beamwidth. Combining four linearly polarized arrays with a sequentially rotated feeding structure can produce a circularly polarized slotted CBCPW antenna arrays. Two arrangements of the sequential rotation method with the feeding phases in a 0 degrees, 90 degrees, 0 degrees, 90 degrees fashion and a 0 degrees, 90 degrees, 180 degrees, 270 degrees fashion are used. The measured gains are 24.889 dBiC for the 0 degrees, 90 degrees, 0 degrees, 90 degrees arrangement and 24.691 dBiC for the 0 degrees, 90 degrees, 180 degrees, 270 degrees arrangement, respectively. The bandwidths of the axial ratio (AR) below 3 dB are 330 MHz and 370 MHz,
Leaky-mode propagation characteristics of slotted coaxial lines
(2007)
Lin, Lieh-Chuan
;
Lin, Yu-De
;
Kitazawa, Toshihide
;
交大名義發表
;
National Chiao Tung University
Propagation Characteristics of Leaky Coplanar Waveguides on Cylindrical Substrates
(2007)
Lin, Lieh-Chuan
;
Lin, Yu-De
;
Kitazawa, Toshihide
;
電信工程研究所
;
Institute of Communications Engineering
In this paper, we investigate the space-wave leaky modes of coplanar waveguides (CPW) on cylindrical substrates and analyze their propagation characteristics. The first higher order leaky mode is assumed and propagation constants of it are solved by the spectral-domain approach (SDA). The effects of outer radii, center strip widths, and slot widths, are discussed. From our numerical results, center strip widths and slot widths play similar roles in design of these structures. Besides, we find that coplanar waveguides on cylindrical substrates have the capability to be wideband antennas.
UWB Printed Monopole Antenna with Radiation-Suppression in 5-GHz ISM Band
(2008)
Chen, Yu
;
Lin, Lieh-Chuan
;
Lin, Yu-De
;
Kitazawa, Toshihide
;
電信工程研究所