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A novel, dual-mode planar circularly polarized (CP) antenna with an end-fire radiation beam in parallel with its plane is proposed and numerically investigated. The antenna consists of an aperture and a printed dipole. A pair of stubs are unilaterally loaded along the dipole, and used to generate a dual-mode radiation characteristic. As simulated, it is observed that the impedance bandwidth (20log|S11|...
Operation principle and conceptual design of a non-uniform square loop circularly polarized (CP) antenna is proposed. At first, the even-mode square loop antenna with perimeter of one wavelength is analyzed by employing a simplified equivalent sources model. The inherent circularly polarized characteristic is theoretically revealed, and then used to conceptually design a non-uniform, bi-sensing square...
Effective wave impedances of substrate integrated waveguide (SIW) with square vias and circular vias are numerically de-embedded from three-dimensional (3-D) full-wave algorithm by virtue of a short-open-load (SOL) calibration approach. Full-wave simulation is at first conducted to model a finite-cell SIW with two feeding uniform waveguides. Afterwards, three calibration standards are established...
Currently, there are increasing demands for unmanned aerial vehicle (UAV) in urban application. UAV based on mobile communication network has further breached the limit of transmission distances. Taking into account the inherent characteristics of communication network infrastructures such as blind spots in distribution and space loss, this paper uses the wireless communication model of base station...
A dual-band bandpass filter using a transversal-interference multimode resonator is proposed. The resonator is composed of a flatten ring resonator attached with two open-circuited stubs. By properly selecting the connecting position between the stubs and a ring, the two pairs of resonant modes can be grouped to make up the dual-passband response, and they can be further separated with virtue of two...
Data transmission technology has a wide rang of application in the industrial production.But the security and reliability of the data transmission can not be guaranteed because of difficult and complex wiring. As for these problems,this paper puts forward a new scheme of wireless data transmission system based on Si4421, the system's hardware and software design is also explained in detail in this...
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