نتایج جستجو برای: two polarization antenna
تعداد نتایج: 2523054 فیلتر نتایج به سال:
In this paper, a technical concept and design of circular polarization detection patch array antenna using a double-balanced RF multiplier is proposed. The microwave integration technology is effectively employed to realize the proposed array antenna. The double-balanced RF multiplier is integrated with an orthogonal planar array antenna. The array antenna which consists of 12 patch elements an...
Kyungho Chung et al. 379 ABSTRACT⎯A novel reconfigurable microstrip patch antenna with frequency and polarization diversities is proposed. A U-slot is incorporated into a square patch, and a PIN diode is utilized to switch the slot on and off, which realizes the frequency diversity characteristic. The polarization diversities among linear polarization (LP), right-hand circular polarization (RHC...
In this paper, we study a Dielectric Resonator Antenna of cylindrical shape with circular polarization for applications in the C band. The proposed antenna is composed of two different layers. The first is Polyflon Polyguide with relative permittivity εr1 = 2.32 and a loss tangent tanδ = 0.002 as a lower layer. The second is Rogers RO3010 with relative permittivity εr2 = 10.2 and a loss tangent...
For polarization measurement of terahertz (THz) electromagnetic radiation we conventionally have been using a set of wire-grid polarizers. In the THz time domain spectroscopy (TDS) measurements, such a method requires twice of the time-delay scans, which is time consuming and can be the origin of the systematic error caused by the intensity fluctuation of laser. In addition, the efficiency of a...
In this paper we propose a circularly polarized (CP) microstrip antenna on a suspended substrate with a coplanar capacitive feed and a slot within the rectangular patch. The antenna has an axial ratio bandwidth (< 3 dB) of 7.1%. The proposed antenna exhibits a much higher impedance bandwidth of about 49% (S11 < −10 dB) and also yields return loss better than −15 dB in the useful range of circul...
In this paper, the effects of antenna pattern and antenna polarization on indoor obstructed (OBS) wireless channels are investigated experimentally. Our results show that linearly polarized (LP) directional antennas are more effective in combating multipath components than other types of antennas in OBS channels, The measurement results are verified with a deterministic wide-band propagation mo...
Abstract—In this article, the design of an electromagnetically-coupled millimeter-wave elliptical patch array antenna prepared to work in the 56–65 GHz (14.8%) frequency band is presented. The introduced antenna array is designed for low-loss, high-gain and low cross-polarization levels. The proposed antenna exhibits a measured gain of 8 dBi and good linear polarization across the desired frequ...
The impact of transmit-antenna spacing and signal-to-noiseratio on channel capacity has been measured intensively in a variety of scenarios. When looking at the physical layer throughput of a multiantenna communication system, the behavior over antenna spacing may look completely different, leading to other conclusions regarding the optimal antenna distance. In this paper, we compare —by testbe...
In this paper, a novel wideband single-feed circularly polarized patch antenna is presented. The antenna consists of an L-shaped probe, four parasitic patches perpendicular to the probe, and a planar reflector. By modifying the structure of the patches, two orthogonal radiation modes are created to realize the circular polarization in the broadside direction. This antenna exhibits a wide impeda...
A dual-band circularly polarized stacked microstrip antenna for ISM Bands (2.45GHz & 5.8GHz) applications is designed and implemented. By stacking two different corner-truncated square patches in a dielectric substrate layer, the microstrip antenna for dual-frequency circular polarization (CP) can be achieved with −11.5 dB and −12.8 dB measured return loss for 2.45GHz and 5.8GHz. Semicircular g...
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