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This paper proposes small CRPA arrays with high-dielectric ceramic superstrates for dual-band operation. Each array element consists of inner and outer microstrip rings printed on a high-dielectric substrate, and a hybrid chip coupler is used for quadrature excitation to achieve circular polarization. The superstrates with high relative permittivity are designed to have a cylindrical shape and are...
Communication overWireless Nanosensor Networks (WNSNs) is envisioned to experience different challenges due to having unique features such as specialized nano-antenna behavior, short transmission range, limited operating capabilities, etc. Among all these features, nano-antenna behavior plays a noteworthy role on overall network-level performance. To the best of our knowledge, the role is yet to be...
In this paper, a 60 GHz CMOS on-chip dipole antenna with loss-reduced silicon substrate, which had been proposed and simulated by the authors, was measured and gain improvement of approximately 9 dB was obtained. In the antenna, rectangular region with 500 μm × 1000 μm around the dipole is irradiated by proton and conductivity is reduced from 10 S/m (10 Ω cm) to 0.1 S/m (1 kΩ cm). Antenna gain of...
This paper proposes a new low-profile high-gain wideband gradient refractive index (GRIN) lens fed by a magnetic-electric (ME) dipole antenna. As a constituent part of this lens, a novel sub-wavelength nonresonant metamaterial unit cell composed of 3-layer substrates is also proposed. By applying Rogers 5880 and air as the top and bottom layers, high and low refractive indexes can be achieved for...
The next generation of wireless communications is the horizon, and the telecoms world is waiting to see exactly at which frequencies 5G will be implemented. Despite some unknowns and technological challenges, it is increasingly becoming clear that the millimeter-wave will be a key enabler for 5G by allocating more bandwidth to deliver faster, higher-quality video, and multimedia content and services...
This paper proposes a single-feed, compact, metasurface-based antenna with circularly-polarized (CP) radiation for the Global Positioning System (GPS) receivers. The antenna consists of a square patch on the metasurface, which is a periodic lattice of 4 × 4 square metallic patches arranged on a grounded dielectric substrate. The CP radiation is obtained by truncating corners of the patch radiator...
A millimeter-wave series-parallel differential-fed patch antenna array is presented, where the intrinsic field distribution of TE20 mode in substrate integrated waveguide (SIW) is used to conveniently implement dual-slot feeding. One 28 GHz patch antenna element fed by TE20-mode SIW is firstly designed, achieving simulated 10-dB impedance bandwidth of 10.2% and peak gain of 6.48 dBi. A 4 × 4 array...
Planar slow wave structures for vacuum electron devices, such as traveling wave tubes, promise to advance the fabrication of vacuum devices and have therefore attracted interest in the last few years. The increasing operating frequencies of such devices demand manufacturing techniques beyond machining and make planar slow-wave structures particularly interesting. In this paper we introduce two different...
A novel technique is introduced to improve the directivity of the E-plane pattern of substrate integrated waveguide (SIW) horn antennas. While the H-plane directivity of a SIW horn antenna is good, SIW horns have a wide E-plane radiation pattern due to the thin substrates of SIW circuits. Increasing the substrate height to improve the E-plane half power beam width (HPBW) makes it difficult to fabricate...
Implantable medical device (IMD) with on-chip antenna (OCA) has got an increasing attention for the biotelemetry applications to monitors the patient's health condition by transmitting the sensed bio-signal to the monitoring device outside the body. This paper presents a novel OCA designed by using standard 0.18um CMOS technology to operate at ISM 2.45 GHz. Using two oxide layers namely, Silicon dye...
This paper presents a circularly polarized reflectarray with linearly polarized feed operating at 28GHz for 5G applications. The proposed reflectarray is composed of a flat reflecting surface populated with numerous two-layer ground-backed non-resonant subwavelength rectangular patch elements which are in staggered arrangement and a Vivaldi antenna as the linearly feeder. Simulated results demonstrated...
In this paper, we present for the first time, the smallest form factor (50mm diameter) two-arm Archimedean spiral on TMM4 substrate, meeting all the performance metrics, which are necessary for commercial-grade product development, for UWB applications. The results show that the proposed antenna has gain above −5dBi, axial ratio less than 3dB and measured return loss less than −10dB throughout the...
In this paper, a new design of planar circularly-polarized (CP) filtering antenna using substrate integrated waveguide (SIW) cavities is presented. The design is based on the dual-mode cavity structure using TE120 and TE210 modes. The satisfying filtering performance of the antenna is realized by a coupled-resonator circuit of the two SIW cavities. And the radiating element is a non-uniform ring slot...
A novel polarization reconfigurable aperture-coupled magneto-electric (ME) dipole antenna is presented. By electronically controlling the state of switches between square patches and an additional strip of the ME dipole, the antenna is capable of switching the polarization among one linearly polarized (LP) and two orthogonal circularly polarized (CP) states. An overlapped bandwidth of 16% from 5.07...
This paper proposes a Ka-band aperture-coupled microstrip patch antenna (ACMPA) based on low temperature co-fired ceramic (LTCC) technology for circular polarization (CP) at 29 GHz. The antenna consists of an aperture coupled patch with stacked parasitic strips (SPS). The CP is produced by cutting the patch and the parasitic strips. The antenna provides an impedance bandwidth of 1.2 GHz from 28 GHz...
A square loop antenna (SLA) based on the hybrid high impedance surface (HHIS) substrate is investigated. For achieving reconfigurable radiation pattern, the antenna includes four feeds which can be excited both individually and simultaneously. At the four corners of the four arms, the antenna is loaded with narrow metallic strips that serve as inductances for the sake of bandwidth expanding. The simulation...
The paper proposes a new beam-switchable dipole antenna. The functionability is realized by reconfiguring the state of the four side apertures of a square substrate integrated waveguide (SIW). Four wide dipoles are loaded in front of the four apertures. The selected radiating aperture is able to excite the corresponding loaded dipole. The other dipoles work as reflectors. Thus, directional radiation...
In this paper, a dual-band high gain antenna with metasurface (MS) is designed and analyzed. This proposed antenna consists of two same substrates which are fixed by four plastic screws. The dual-band antenna on the top substrate is fed by the coplanar waveguide (CPW), whereas the planar MS consisting of uniform metallic patch cells is fabricated on the second substrate. The extended branch of antenna...
A simple structure dual-band circularly polarized (CP) microstrip antenna (MSA) installed on a single layer substrate is designed in this paper. The slotted radiation patch with four symmetric stubs of this MSA is fed by a coaxial line. The MSA has good CP characteristics and impedance matching in both of the two bands. Moreover, we can easily get different frequency ratio of the higher and lower...
This paper presents a circularly polarized tag on an AMC to achieve longer read range for UHF RFID on-body applications. In the conference paper, two asymmetrically orthogonal cross-dipoles printed on FR4 substrate are combined to generate a degenerate mode for circularly polarization. A symmetric T-matching transformer is employed to conjugate matching with a Monza 4 microchip. The body effect is...
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