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The Complexity‐to‐Diversity (CtD) strategy was applied to synthesize a 23‐member compound collection from the natural product drupacine, including 21 novel compounds. An unusual benzo [d] cyclopenta [b] azepin skeleton was constructed by Von Braun reaction to cleave C−N bond of drupacine. Moreover, compound 10 has potential cytotoxicity to human colon cancer cells with low toxicity to the normal human...
A wideband dual-polarization antenna applying multimode with high isolation is proposed here. The proposed antenna inculdes four square patches and a metal loop on the substrate. Excited as the conventional orthogonally cross dipoles by coaxial probe, high isolation and favorable impedance match can be realized. The presented antenna accomplishing a −15dB return loss bandwidth of about 52.8% for port...
The resonance characteristics of cross-dipole planar antennas are analyzed by using Theory of Characteristic Modes (TCM) in this paper. The resonant frequency, bandwidth, current distribution and other characteristics of the antenna are compared here. Unlike the traditional analysis methods, the mode decomposition is proposed here. It considering the radiating structure as a whole, seek the support...
A broadband frequency reconfigurable antenna used in UWB system is designed. Bow-tie-shaped patch is used as the radiating structure. Frequency reconfigurable performance is achieved by turning on or turning off the PIN diodes. The proposed antenna has two tuning states with wide frequency bandwidth. The lower and upper operating frequency band are 3.16–4.38GHz and 4.25–6.65GHz, respectively. The...
A circle stacked patch antenna is analyzed by using Theory of Characteristic Modes (TCM). The resonance and radiation characteristic of this kind of antenna is proposed. It is confirmed that by using a parasitic patch up to a conventional thick microstrip antenna, a second resonance frequency is introduced. Between the two resonance frequencies, there is an anti-resonance point, which is a benefit...
In this paper, a four port disk shaped compact multiple input multiple output (MIMO) patch antenna for vehicular application is proposed and fabricated. The structure is composed of a circle patch with cross slot combined to an annular ring patch. The structure is analyzed by using Theory of Characteristic Modes (TCM). The inner and outer part of the antenna operated at its TM11 and TM21 modes respectively...
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...
In this paper, a multimode microstrip antenna consist of two annular ring patch antennas operating at its TM11 and TM21 modes respectively for four ports multiple input multiple output (MIMO) applications is investigated. Both the two parts are dual-polarized. The inner patch which has cross slot in the center is excited by coaxial probe and the outer ring is excited by a microstrip curved bend. Therefore...
This paper presents a planar printed quasi-Yagi antenna. The proposed antenna consists of a microstrip line slotline transition structure, a driver dipole and two parasitic stripes. The driver dipole is connected to the slotline through coplanar stripline (CPS) which is designed by using a pair of exponential curves and a circular groove end, just the Vivaldi antenna structure, so as to achieve a...
In this paper, a beam-tilted array used as the reader antenna of ultra-wideband (UWB) location systems is proposed. Bow-tie antenna is adopted as element in the array to achieve a wideband performance. Feeding structure of coaxial line is employed to realize beam tilt angle. Good simulation and measurement results are presented. The antenna achieves a wide impedance bandwidth of 36.8% (3.1∼4.5GHz)...
A double-sided printed bow-tie antenna array fed by balanced Schiffman phase shifter, which used as a reader antenna in ultra-wideband (UWB) location system, is proposed in this paper. The presented antenna has a impedance bandwidth of 3.4–4.4 GHz and a high gain of more than 5dB within the whole bandwidth. Good omnidirectional radiation pattern is obtained in the plane of θ = 15°. Good simulation...
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