Deqiang Yang

Bio: Deqiang Yang is an academic researcher from University of Electronic Science and Technology of China. The author has contributed to research in topics: Time domain & Dipole antenna. The author has an hindex of 2, co-authored 4 publications receiving 4 citations.

The new design of miniaturized dual-band 180° hybrid-ring coupler

Abstract: A dual-band hybrid-ring coupler made-fed by microstrip lines was designed based on the cyclic characteristic of hybrid-race conventional form. Using compact folded and coupled transmission lines, the model was miniaturized and the bandwidth was significantly broaden. The design idea is hoped to be applied for dual-band. Then measurement result was presented. It can be kept a perfect consistency with the simulation result.

Broadband planar quasi-Yagi antenna with band rejection

Abstract: Aiming to realize an end-on-fire antenna with band rejection for UWB system, this paper proposes a planar quasi Yagi antenna with dual-dipole structure. The antenna uses a dual-dipole to generate reverse surface currents at some specific frequency points. This mechanism is used to design band rejection. Simulated and measured results show that the bandwidth of the proposed antenna is from 3.37 GHz to 11.28 GHz. Meanwhile, the antenna achieves a band rejection from 5.15 GHz to 6.12 GHz, which avoids WLAN interference. In passband, the antenna achieves a moderate gain, from 4.3 dBi to 7.9 dBi.

Design of an optical fibre system for time-domain impulse signal transmission

Abstract: Due to the sharp pulse generated by the time-domain impulse radar has widely instantaneous bandwidth, it is very difficult to achieve undistorted, low-loss and dispersion-free transmission by coaxial cable With the technique of direct modulation and automatic power control of the analog optical transceiver module, a transmission system of the wideband RF signals over optical fibre is proposed in this subject Test of the Gaussian pulses shows that, the impulse waveform has good shape retention

A novel time delay controlling UWB array based on analytical algorithm

Abstract: In this paper, a new design of time controlling time domain ultra wide band (UWB) antenna array based on software radio technology (SRT) analytical algorithm is presented. With the novel design array, automatic scan of synthetic pattern is realized. Theoretical analysis and computation is employed to set accurate delay time for each element of the array. Scanning angle can be reached to ±30 degrees. It has high precision and speed, and it is a promising choice for ground penetrating radar (GPR), nondestructive testing (NDT).

Novel Dual-Band Coupled-Line Quadrature Couplers with Unequal Power Division

Abstract: A dual-band coupled-line 90° unequal coupler is proposed in this paper It is simply composed of three pairs of coupled lines and four port extensions Analytical design methodology and detailed design guidance are given, which significantly simplifies the design procedure Due to the utilization of coupled lines, the proposed coupler possesses tight circuit configuration, and since the degree of freedom is increased for the even- and odd-mode characteristic impedances, the coupled lines enable the dual-band operation Meanwhile, the coupler can operate with unequal power division Furthermore, the employment of port extensions eliminates the additional insertion loss caused by additional port lines Eventually, two prototypes of the proposed coupler are designed and fabricated The good agreement between the expected and measured results confirms the design methodology in this work to be correct and effective

Ultra-wideband antenna for achieving trap function based on planar double dipoles

Abstract: The invention provides an ultra-wideband antenna for achieving a trap function based on planar double dipoles. The ultra-wideband antenna comprises a dielectric substrate and a metal antenna patch, wherein the metal antenna patch comprises a feed coupling unit, an energy transmission unit, a radiating unit and a guide unit; the feed coupling unit comprises a floor, a microstrip feeder and a slot line; the radiating unit comprises two pairs of dipoles; short dipoles are arranged at the upper part and long dipoles are arranged at the lower part; the energy transmission unit comprises two symmetrical coplanar strip lines; and the guide unit comprises two parallel parasitic metal strips which are located at the centers above the dipoles. The overall space structure is compact; an antenna backboard is tightly connected with the feeder; a radiation oscillator meets the phase requirements in a coplanar strip line power supply manner; the size is reduced; the design is convenient; the broadband radiation principle of the antenna is easy to understand; the replicability of a trap generation method is high; and a stop band with any frequency point can be achieved by the method in theory.

A New Multi-Band Multiple Beam Forming Nolen Matrix Antenna Feeding Network for Cognitive Radio

Abstract: A novel method of Beam forming network for multiband frequencies based on Nolen matrix (4×4) topology using multiband 90o ring Coupler was proposed and its performance was analyzed in this paper. The above method is able to produce a multiband Beam forming output with different center resonant frequencies for 2.8GHz, 6.3GHz and 9GHz which provides beam steering in various directions so as to avoid the interference between the users. Beam steering is used in smart antenna to minimize the wastage of power and to maximize the directivity in the desired direction .This formation was simulated and measured using Microstrip technology in ADS (Advanced Design system) software . The simulated and measured results show the good agreement in return loss. Keyword- ring coupler; multiband Beamforming network; nolen matrix

Wideband phased mobile antenna array devices, systems, and methods

Abstract: Wideband phased mobile antenna array devices, systems, and methods include antenna elements arranged in a substantially linear array and positioned and adjusted on a substrate to achieve an aggregate radiation pattern in an end-fire direction. In some embodiments, each antenna element includes two pairs of antenna arms, a pair on either side of the substrate. In some embodiments, each pair of antenna arms are configured to be adjusted and positioned symmetrically to generate the end-fire radiation pattern. In some embodiments, each of the antenna elements in the linear array is spaced apart from each other by a distance that is equal to approximately λ/2, where λ is a wavelength associated with a frequency within a desired operating frequency range of the antenna system.