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A four-way compact unequal power divider is proposed in this paper. Compared to the traditional unequal power divider, the proposed circuit uses the transmission lines less than quarter wavelength to achieve desired power dividing. The analysis and general equations are presented. Finally, to demonstrate the validity of the proposed design strategies, a four-way power divider working at 1.5 GHz with...
A novel modified-design of Hilbert curve is presented, which has stable frequency response for both TE and TM polarizations. Furthermore, a frequency selective surface (FSS) based on this modified-Hilbert curve is proposed for shielding against dual-band WLAN. It has an insertion loss of more than 15 dB with the bandwidths of 220 MHz at 2.45 GHz and 160 MHz at 5.78 GHz. The proposed FSS provides an...
A Ka-band left-hand circularly polarized crank-line microstrip antenna is designed by HFSS. The operating frequency of antenna is 29.4–31GHz, using microstrip series-fed mode, the input impedance is 50Ω. The maximum gain of the center frequency of 30.2GHz is 11.8 dB, and 3-dB axial-ratio bandwidth is up to 10.9% (28.5–31.8GHz). The results show a better axis ratio of 2dB and VSWR of less than 1.25...
An implantable circularly polarized antenna, working at dual Industrial, Scientific, and Medical (ISM) bands, is investigated. The proposed antenna is composed of double rings and fed differentially. Reactive loading is employed to achieve a slow wave effect through adding equilateral-triangle-patches to the double rings. Thus, a compact size of 18 mm × 9 mm × 0.635 mm can be obtained. The generated...
A printed loop monopole antenna with wideband circular polarization is presented. The wideband circular polarization is achieved by asymmetrical excitation of hemicycle ground plane and planar loop monopole antenna. The combined radiation provides a wide axial-ratio bandwidth spanning from 1.73to 3.10GHz (54.8%). A parametric study of the key geometric parameters is given for the better understanding...
A novel end-fire magneto-electric (ME) dipole antenna fed by substrate integrated waveguide (SIW) is proposed at the 60-GHz band. The antenna is composed of an open-ended SIW and a pair of electric dipoles, which has a simple structure that is easy to integrate into substrates. Wide impedance bandwidth of 44%, symmetrical radiation patterns that are almost identical in two orthogonal planes, low backward...
A novel differential wide-slot ultrawideband(UWB) antenna with band-notched selectivity is proposed and investigated in this paper. The antenna consists of a rectangle ground with a wide slot and a stepped differential feeding line. In order to realize controllable notched bands characteristics, a pair of half-wave-length slits are utilized in ground and feeding structure. Moreover, the notched bands...
A new conformal antenna array for cylindrical structure is proposed in this paper. By employing symmetrical circular slots and coplanar waveguide (CPW) series-fed, a wide bandwidth is realized. The simulation results show that the bandwidth of the conformal antenna array is 2.1 GHz–3.35 GHz (the relative bandwidth is 45.9 %) for S11<−10 dB, which is 20.6 % wider than that of the planar structure...
In this paper, a ring-circled mono-cone antenna is proposed for wireless body area network (WBAN) applications. The proposed antenna, composed of a modified mono cone and a copper ring connecting to the ground plane by four cylinders, is vertically fed using a coaxial line through the bottom ground plane. The added ring and cylinders contribute to an extra lower frequency band, and thereby extend...
A broadband ±45 slant dual-polarized base station antenna element for LTE700/GSM850/GSM900 is presented in this paper. The proposed antenna is composed of two pairs of butterfly radiation patches which are coupling-fed by two Y-shaped microstrip lines. A prototype of the proposed antenna is designed fabricated and test. The measured results show that a bandwidth of 21.7% (0.65–1 GHZ) for VSWR<1...
A new differentially fed circularly polarized (CP) patch antenna is designed. The proposed antenna operates at the 2.40–2.48 GHz industrial-scientific-medical (ISM) band whose center frequency is 2.45 GHz. Utilizing differential feeding, it can interface directly with radio frequency integrated circuits. Cutting asymmetry square-shaped slots on the radiating patch and truncating two cross-shaped slots...
In this paper, balanced bandpass filter (BPF) with controllable dual passband performance is presented. Based on the voltage distribution of traditional half-wavelength resonator, the stub-loaded theory with independently controlled differential-mode resonances is presented and applied to design dual-band balanced BPF with independently controlled passband locations. Then, except for the main coupling...
This presentation overviews recent advances in the designs of low profile circular patch antennas with monopole like radiation patterns. This type of antennas can provide omnidirectional radiation patterns in the azimuth plane. Techniques for the enhancement of the bandwidths are discussed. The antennas can be designed for linear and circular polarizations.
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