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The spectral characteristics of truncated Localized Waves propagating in dispersive silica are analyzed. Numerical experiments show that the immunity of the truncated Localized Waves propagating in dispersive silica to decay and distortion is enhanced as the non-linearity of the relation between the transverse spatial spectral components and the wave vector gets stronger, in contrast to free-space...
This paper discusses a systematic design of a MS-to-CPS transition (or balun) that has good impedance match and low insertion loss, and maintains phase and amplitude balance, which are important for many mmWave applications. Phase and amplitude balance are not discussed in previous MS-to-CPS transition studies.
A novel low cost feeding mechanism based upon new synthesized planar waveguide substrate integrated waveguide (SIW), is presented for microstrip antenna arrays (MPAs) at millimeter-wave (mmW) band to avoid feeding loss, specially the conduction loss. As an example, SIW-fed two dimensional (2D) 2×2 MPA array @ 60 GHz is introduced. The presented antenna is simulated by HFSS to validate its performance...
In this paper, a printed grid array antenna on a low cost packaging substrate is presented. Simulation and measurement results of the antenna return losses and radiation patterns are provided. Simulations show that the antenna is matched on the frequency band from 57 to 64GHz and has a broadside gain of over 11dB all over the band. Measurement results show that the antenna performance is shifted 2GHz...
Micromachined patch antennas at 60 GHz were fabricated on 400 µm silicon wafers. These were fed by a microstrip-to-coplanar transition. Good agreement was found between simulation and fabrication designs' return loss. The attained bandwidth was ∼3 GHz. Surface waves excited in the substrate, diminished radiation. This was observed in the radiation patterns. Even so, a 4.6 dBi gain was achieved. Lastly,...
A high relative dielectric constant substrate has been combined with a slot-loading technique to reduce antenna size. Further, the slot-loading technique has been used in an array configuration to increase the bandwidth by exciting each element at a different resonant frequency. This method results in almost a 30% decrease in size and 1.5% increase in bandwidth. Two 2×1 antenna arrays are demonstrated...
This paper presents design considerations of a UHF-band card-type tag placed on the packet near the chest of a human body for our University-campus applications. Using FEKO simulation tool, we designed four kinds of highly platform-tolerant tag antennas and evaluated the influences of a simple human model on the power transmission coefficient, radiation pattern, and realized gain. Also, the input...
This paper presents new experimental results of angle of arrival (AoA) measurements for localizing passive RFID tags in the UHF frequency range. The localization system is based on the principle of a phased array with electronic beam steering mechanism. This approach has been successfully applied within a UHF RFID system and it allows the precise determination of the angle and the position of small...
This paper presents the design of a circularly polarized Radio Frequency Identification (RFID) reader antenna for worldwide Ultra High Frequency (UHF) (860–960 MHz) applications. The proposed antenna, which consists of a microstrip patch with truncated corners and a cross slot, is suspended over a ground plane and fed through vias that extend from the quadrature 3 dB branch line coupler placed below...
Development of a low profile conformal RFID tag antenna with an omnidirectional pattern when mounted on a water bottle is discussed. Results from full-wave electromagnetic simulations are presented to explain the design procedure and to evaluate the performance of the prototype tag antenna. The design uncertainty is quantified based on the expected maximum variations in the tag antenna and tag chip...
Inkjet-printing offers a potential alternative to conventional tags manufactured by etching. The inkjet-printed narrow-line tags discussed in this paper are fabricated using less conductive materials than conventional tags. This paper presents the performance of the narrow-line tags when used on different materials. We present read range comparison of passive ultra high frequency (UHF) inkjet-printed...
Performance evaluation of passive Radio Frequency Identification (RFID) tags is a crucial but challenging task. In fact, tag performance depends on multiple factors like the goodness of the conjugate matching between chip and antenna, the chip sensitivity, and the strength and quality of backscattered signal. Moreover, passive RFID tags lack wired connectors and therefore cannot be directly interfaced...
Wideband RFID tag antennas are highly desired for global applications. Moreover, the wideband feature makes tags less sensitive to the external detuning. This paper presents a circuit-based bandwidth-enhancement theory by applying the double-tuning technique to tag antennas. Conditions of the optimum double-tuning and the maximum bandwidth out of double-tuning are derived. Closed-form equations are...
Reciprocity theorem in conjunction with transmission line analogy and the cavity model is employed to develop a very fast analytical solution for the radiation fields of microstrip antenna arrays covered with magneto-dielectric superstrates. The superstrate is designed using broadside coupled split ring resonator (SRR) inclusions and is placed at approximately one-tenth of a wavelength apart from...
In this paper, a dual-polarized microstrip array antenna with orthogonal feed circuit is proposed. The proposed microstrip array antenna consists of a single substrate layer. The proposed array antenna has microstrip antenna elements, microstrip lines, air-bridges and cross slot lines. For dual polarization, an orthogonal feed circuit uses the Both-Sided MIC Technology including air-bridges. The Both-Sided...
We present the development of an 8-channel X-band microstrip phased array receiver with beam-scan capability of +/−45 degrees in the azimuth plane. Two 0.13 µm CMOS RFIC chips are integrated directly on the laminates for the array feed network, with each chip comprising of a 4-way power combiner network and 4 channels of RF front-end. Each RF-front-end consists of an LNA, a VGA and a phase shifter,...
This paper presents the design and construction of a microstrip array antenna operating at 5.3 GHz, to be used as an avalanche sensor in avalanche measurement. The advantage of the antenna is it can achieve a high gain of 15.6 dB with bandwidth of 90%. This was achieved by separating the feed network from the main patches; and increasing the antenna height by installing the feed layer at the back...
A novel wideband planar polygon slot antenna with a metamaterial inspired reactive coupling element is presented. The antenna is printed on a Liquid Crystal Polymer (LCP) substrate and shows bidirectional radiation characteristics. The antenna, including the ground plane, occupies and area of 2.5 × 2.0 cm2. An impedance bandwidth of 17.5% is measured for the single antenna with a center frequency...
The design of a dual-polarized microstrip patch sub-array to be used as the radiating element in an array for the CASA Off-the-Grid radar system is presented. The sub-array consists of four microstrip patches with dual feeds and oppositely fed to reduce the cross-polarization levels. Simulation results in demonstrate a 7% bandwidth at 9.4 GHz, port isolation of 30 dB, and cross-polarization levels...
This paper presents a microstrip 4×8 retrodirective array which consists of two 4×4 sub-arrays. These two 4×4 sub-arrays employ proximity-coupled microstrip ring antennas as the array elements. The design frequency of the ring antenna is 5.8 GHz and the antenna produces voltage standing wave ratio (VSWR) and axial ratio less than 1.5 and 1 dB, respectively. The designed 4×8 retrodirective array is...
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