Abstract Semi‐analytical design approach to electrically small, dual‐mode resonant, wideband circularly polarised (CP) microstrip annular sector patch antenna (MASPA) with variable polarization is proposed for satellite‐assisted Internet‐of‐vehicle (IoV). At first, the upper bound of small theoretically laid down by advancing an interpolated algorithm eigen‐roots characteristic equation, so that radius can be rapidly determined in initial step. In this way, MASPA patch, multimode and...

In this article, a design approach to radial-resonant wide beamwidth circular sector patch antenna is advanced. As properly evolved from U-shaped d ipole, prototype magnetic dipole can be fit in the radial direction of radiator, with its length set as positive odd-integer multiples one-quarter wavelength. way, multiple <tex>$\mathrm{TM}_{0m}(m=1$</tex> , 2,...) modes resonant short-circuited circumference and widened E-plane beam-width realized by proper excitation perturbations. Prototype...

The emergence and dissemination of Escherichia coli (E. coli) strains that produce extended-spectrum beta-lactamases (ESBLs) represents a major public health threat. present study was designed to evaluate the prevalence characteristics ESBL-producing isolates from chickens in central China during 2016-2019. A total 407 E. isolated 581 chicken swabs were identified conventionally analyzed for various cephalosporin susceptibility by disk-diffusion assay. screened using double=disk synergy test...

The radiation behavior of a horizontal sectorial electric dipole is studied. Azimuthal beamwidth investigated by employing numerical integrals and approximate analytical expressions. Closed-form formulas for calculation are derived using the Fourier series expansion generating functions. In these ways, broadening mechanism sheet can be quantitatively revealed mathematically understood. Numerical results on 2-D dipoles with centered angle <tex xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A novel triple-mode resonant circular sector patch antenna with azimuthal null frequency scanning functionality is advanced in this article. The implicit periodicity of the roots zero-order Bessel function revealed and then employed to design multi-mode resonant, antennas (ANFSAs). As proven, when a parasitic radiator properly incorporated, under resonances multiple TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> <italic...

A design approach to a planar dual-sense bidirectional circularly polarized (CP) antenna is advanced. The resultant can exhibit orthogonal CP radiations in arbitrary directions between 90° and 180°, i.e., the flared angle formed by pure left-handed (LHCP) right-handed (RHCP) could be set wide range from 180°. operational principle revealed an equivalent source model at first. Then, prototype antennas are advanced incorporating high-order mode resonant, V-shape dipole magnetic dipole,...

A novel design approach to triple-mode resonant null frequency scanning antenna (NFSA) with positive scanned slope is proposed. Firstly, a circular sector patch radiator short-circuited circumference introduced generate multiple TM0m (m = 1, 2, …) mode resonances. Then, as theoretically predicted and numerically proved, the first three 3) modes can be effectively combined yield functionality slopes. Next, prototype designed, fabricated, measured. As demonstrated experimentally validated,...

Circular sector patch antenna with circumferential short-circuited, wide beamwidth characteristic and low profile is presented studied. Two radial-resonant magnetic dipoles asymmetric boundary have been placed the radiation principle analyzed. As will be seen, resultant would exhibit a E-plane of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{90^{\circ}}$</tex> maintain greatly 0.036-guide wavelength.

Abstract Semianalytical design approach to a triple‐mode resonant, wideband null frequency scanning sectorial monopole antenna is proposed. As demonstrated, TE 3/5,1 , 9/5,1 and 3,1 mode within 150°, circumferentially resonant are simultaneously excited realize functionality. The prototype exhibits wide impedance bandwidth of 75.3%, ranging from 1.40 3.09 GHz. Within the band 1.55–2.70 GHz, radiation linearly scans θ = +90° +8° with sensitivity 12.9 MHz/°. Moreover, possesses maximum gain...

Abstract A novel synthesis design approach to multimode resonant, azimuthal null frequency scanning antennas (ANFSAs) coordinated by null‐depth is presented. The antenna composed of a principal radiator and an auxiliary one fed different ports. chart gauged null‐depths developed determine the respective exciting amplitude phase conditions for radiators. As theoretically demonstrated numerically verified, ANFSA can exhibit adjustable varying from −12∼−30 dB. three‐port unequal‐split power...

Design approach to a planar unidirectional, complementary dipole antenna under quadruple mode resonance is proposed. The design initiates from antenna, with pair of flat electric dipoles be closely incorporated slot element. As theoretically predicted by the equivalent multi-source model, can successfully excited yield unidirectional height about 0.04-wavelength. have been numerically demonstrated and experimentally validated at 2.5-GHz band, implemented on air substrate 5 mm (i.e.,...

A novel slot-combined complementary antenna composed of semicircular sector electric dipoles is proposed. Two pairs are properly incorporated to yield a low-profile, dipole antenna. The advanced measured with relatively thin profile 0.042-wavelength and the maximum front-to-back ratio (FBR) fabricated can reach up 12.7 dB. Measured results show that mode slot element be impedance bandwidth 2.38~3.11 GHz (i.e., 25.0% in fraction) an available quasi-unidirectional radiation 24.6%.

A mini-survey for null frequency scanning antennas (NFSAs) is presented in this article. NFSAs based upon different operation principles are classified and reviewed at first. Then, article concentrates on the recent advances of multi-mode resonant (NFSAs). Mode synthesis design approach to introduced. Finally, possible developing trends prospected.

A quasi-isotropic, circumferentially short-circuited magnetic dipole antenna is designed and different feed techniques are investigated. Coaxial cables without with a sleeve choke have been respectively used to excite the at 3.6 GHz. As can be seen, it has experimentally validated that able suppress spurious radiation caused by unbalanced sheath current, which enhances pattern's uniformity in $zx$ - $xy$-planes 6.6 dB most.

Preliminary studies of high gain, wideband triple-resonant patch antenna are advanced. Two circular sector radiators which flared angles different can be properly stacked, thus leads to wideband, dual-mode and low-profile characteristic. Then, the first order resonant mode within upper radiator is excited perturbed generate a In simulation, proposed exhibits usable bandwidth 12.3% boresight gain up 11dBi. Meanwhile, profile controlled less than 0.043-guided wavelength.

A wideband tilted circularly polarized (CP) beam dual-resonant patch antenna with low-profile is proposed. Initial size of the empirically calculated according to eigenmode functions microstrip radiator. Pin-loaded technique employed tune and lead a CP characteristic. As validations, prototype on air substrate thickness 4mm (i.e., 0.034-wavelength) fabricated, measured verified at 2.6GHz-band. The proposed centered angles 200° exhibits an impedance bandwidth up 24.1%. It radiation within...