There are many methods for mitigating GNSS multipath errors. However, none of them completely eliminate the effects of multipath or suit all GNSS applications. A new class of multipath mitigation methods exploit new dualpolarization antenna technology. GNSS signals received 140 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation, Portland, OR, September...

Circularly-polarized antenna is built based on a new SIW (substrate integrated waveguide)structure which contains cavity-backed resonator and a conventional polarized ring with twosquare slits in inner and outer ring that differ 90° at position and is proposed for right-handedcircular polarization (RHCP) and fabricated in two separate layers. A broadband impedancebandwidth of 13.9% and a RHCP a...

Background: A mobile health (mHealth) technology based application was developed to help rural health care providers (RHCPs) identify and refer presumptive tuberculosis (TB) patients to the nearest microscopy centre for sputum examination using mobile applications on their smart phones. Objective: To determine the feasibility and yield of presumptive TB case referrals by RHCPs using mHealth tec...

A compact reconfigurable four-feeding microstrip antenna with polarization diversity is presented in this paper. With four triangle-shaped elements as the radiation patch, the proposed antenna can achieve good impedance match for linear polarization (LP), left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). A four-way power divider made by three Wilkinson power di...

We analyze the geometric structure and mechanical stability of a complete set of isostatic and hyperstatic sphere packings obtained via exact enumeration. The number of nonisomorphic isostatic packings grows exponentially with the number of spheres N, and their diversity of structure and symmetry increases with increasing N and decreases with increasing hyperstaticity H≡N_{c}-N_{ISO}, where N_{...

The implementation of a null-steering antenna array using dual polarised patch antennas is considered. Several optimality criterion for adjusting the array weights are discussed. The most effective criteria minimises the output power of the array subject to maintaining a right hand circular polarisation (RHCP) response on the reference antenna. An unconstrained form of this criteria is derived,...

Abstract: Tilt beam characteristic by changing the length of finite-sized square dielectric substrate of one arm rectangular spiral antenna has been investigated. Rectangular spiral is printed on a finite sized dielectric substrate (εr=3.27) backed by a finite-sized conducting plane. Rectangular spiral radiates in Right Handed Circular Polarization (RHCP). Horizontal spiral arm length (HL) is v...

A circularly polarized (CP) substrate integrated waveguide (SIW) cavity-backed slot antenna is proposed. A slot split ring (SSR) etched on the top metal surface of an SIW resonator is employed to generate the right-handed circularly polarized (RHCP) wave. The proposed antenna is excited directly by a coaxial probe with a proper distance from the symmetric axis of the SSR resonator. A prototype ...

Abstract Taking advantage of multimaterial additive manufacturing, this work demonstrates a kind polarization‐maintaining metasurface (MS) for spin‐decoupled beam shaping. The wavefronts the two spin states, i.e., left‐hand circular polarization (LHCP) and right‐hand (RHCP), can be independently manipulated while output state remains same as input. meta‐atom is implemented with dual‐polarized a...

[RhCp*(OAc)(2)(H(2)O)] [Cp* = pentamethylcyclopentadienyl] catalyzed the C-H bond amidation of ferrocenes possessing directing groups with isocyanates in the presence of 2 equiv/Rh of HBF(4)·OEt(2). A variety of disubstituted ferrocenes were prepared in high yields, or excellent diastereoselectivities.