Browsing by Author "Chou, GJ"

Now showing 1 - 4 of 4

An integrated quasi-planar leaky-wave antenna
(1996-08-01)
Chou, GJ
;
Tzuang, CKC
;
交大名義發表
;
電信工程研究所
;
National Chiao Tung University
A new quasi-planar leaky-wave antenna is presented. It consists of microstrip line on one side of the substrate and uniplanar circuit on the other side placed in a partially opened waveguide. The leakage is produced by the excitation of the first higher order (odd) microstrip mode coupled electromagnetically through slotline on the opposite side of the substrate. Theoretic results based on rigorous Green's impedance integral equation method show that the new microstrip-slotline-coupled leaky-wave antenna has broadband tuning range via structure parameters and is Insensitive to microstrip line width variation. Measured relative power absorbed (RPA) results indicate that the useful frequency bandwidth agrees with what rigorous field theory predicts. The measured antenna radiation patterns also agree very well with approximate theoretic computations. Theory and experiments show that the proposed leaky-wave antenna can interface to feeding structure easily and directly, the new antenna may become good candidate for microwave and millimeter-wave integrated antenna design.
Oscillator-type active-integrated antenna: The leaky-mode approach
(1996-12-01)
Chou, GJ
;
Tzuang, CKC
;
交大名義發表
;
電信工程研究所
;
National Chiao Tung University
This paper describes basic research carried out to design a microwave source module employing the concept of an active-integrated leaky-mode antenna. The novel active-antenna source module utilizes a microstrip as the radiating element while adopting uniplanar technology for the active circuit design, The microstrip is operated in the first higher order odd mode, which is a leaky mode, and excited by a proximity-coupled center-fed slotline on the same surface of the uniplanar microwave-integrated circuit. The measured performance of an X-band transmission-type injection-locked active-integrated antenna source module demonstrated that such a design approach was suitable for linear array integration for quasi-optical power combining, The harmonic-balance (BOB) analysis of the proposed active-Integrated antenna agrees with the measurements in both free-running frequency and power level. The measured radiation patterns of the active-integrated antenna also agree well with the theoretical predictions.
Short leaky-wave antennas of sum and difference patterns
(1996-07-04)
Lin, JM
;
Tzuang, CKC
;
Chou, GJ
;
Su, S
;
交大名義發表
A set of differential feed short (similar to 0.7 lambda(0)) leaky-wave antennas with sum (Sigma) and difference (Delta) patterns is presented. Rigorous field-theory analyses show that the radiation characteristics of these antennas agree well with the measurements. The performance of these antennas is well suited for direction finding applications.
Short leaky-wave antennas of sum and difference patterns
(1996-07-04)
Lin, JM
;
Tzuang, CKC
;
Chou, GJ
;
Su, S
;
電信工程研究所
A set of differential feed short (similar to 0.7 lambda(0)) leaky-wave antennas with sum (Sigma) and difference (Delta) patterns is presented. Rigorous field-theory analyses show that the radiation characteristics of these antennas agree well with the measurements. The performance of these antennas is well suited for direction finding applications.