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Return loss

About: Return loss is a research topic. Over the lifetime, 11090 publications have been published within this topic receiving 97603 citations.


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Journal ArticleDOI
TL;DR: In this article, a dielectric embedded electronically steerable passive array radiator (ESPAR) antenna array for mobile wireless communication terminal is developed by finite element method-based numerical modeling technique.
Abstract: A novel dielectric embedded electronically steerable passive array radiator (ESPAR) (DE-ESPAR) antenna array for mobile wireless communication terminal is developed by finite element method based numerical modeling technique. The size reduction of the seven-element monopole antenna was accomplished by embedding the array in a cylindrical rod of FIK ceramic complex with a relative permittivity around /spl epsiv//sub r/=4.5. Dielectric embedded prototypes of a seven-element ESPAR antenna array were modeled and experimentally characterized. Experimental and numerical results are in good agreement. The optimized antenna produced a horizontal directivity of 5.1 dBi and return loss of 19 dB at 2.48 GHz. An overall volume reduction of 80% and footprint reduction of 50% were achieved.

117 citations

Proceedings ArticleDOI
16 Nov 2003
TL;DR: In this article, the authors describe the bottom-fed planar elliptical dipoles, which are electrically small ultra-wideband (UWB) dipoles with bandwidths on the order of 3:1 or better.
Abstract: This paper describes the "bottom fed" planar elliptical dipoles These antennas are electrically small ultra-wideband (UWB) dipoles with bandwidths on the order of 3:1 or better Return loss is typically -14 dB, and boresight gain is nominally 3 Bi Bottom fed planar elliptical dipole antennas are well suited for commercial applications

116 citations

Journal ArticleDOI
TL;DR: In this article, a compact all-single-mode fiber add-drop multiplexer for dense wavelength-division-multiplexing systems is demonstrated, which consists of a polished fiber coupler with identical Bragg gratings within the interactive length.
Abstract: A novel compact all-single-mode fiber add-drop-multiplexer for dense wavelength-division-multiplexing systems is demonstrated. The device consists of a polished fiber coupler with identical Bragg gratings within the interactive length. The multiplexer operation has been theoretically analyzed and calculated transmission and reflection spectra are given. A fabricated prototype device shows good performance, but suffers from a high-insertion loss of 7 dB, which is due to the long but imperfect coupling region and can be drastically reduced in principle. A return loss >30 dB, coupling efficiency=99%, and bandwidth at FWHM /spl Delta//spl lambda/=1.2 mn was measured.

116 citations

Journal ArticleDOI
TL;DR: In this article, a reduced beam-squinting printed leaky-wave antenna (LWA) is proposed, comprising cascaded negative-refractive-index transmission line (NRI-TL) metamaterial unit cells.
Abstract: A reduced beam-squinting printed leaky-wave antenna (LWA) is proposed, comprising cascaded negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. Each NRI-TL unit cell is implemented in co-planar strip (CPS) technology and consists of a host TL loaded with series interdigitated capacitors and shunt meandered inductors. Periodic analysis is applied to the NRI-TL unit cell in order to extract the dispersion and Bloch impedance characteristics. Subsequently, the angular variation of the main radiated beam with frequency or ldquobeam squintingrdquo is derived, based on the expression for the Bloch propagation constant of the NRI-TL line. It is shown that by operating the LWA in the upper right-handed band where the phase and group velocities are closest to the speed of light, the beam squinting that the antenna experiences can be minimized. The theoretical performance of the LWA is verified through full-wave simulations and measurements of a fabricated prototype designed to produce a radiated beam at an angle of at GHz. This 20-element NRI-TL LWA exhibits a measured return-loss bandwidth below dB of 0.91 GHz (18.2%), and an average beam squint of 0.031/MHz. The proposed NRI-TL LWA is uniplanar, differential and broadband, and therefore suitable for integration with other microwave components and devices.

114 citations

Journal ArticleDOI
TL;DR: In this paper, a compact CPW-fed monopole antenna is proposed for dual-band wireless local area network (WLAN) operations, which consists of two strips, and has compact size of 20/spl times/155/pl times/16 mm/sup 3/ including the ground.
Abstract: A compact CPW-fed monopole antenna is proposed for dual-band wireless local area network (WLAN) operations The proposed antenna, which consists of two strips, has compact size of 20/spl times/155/spl times/16 mm/sup 3/ including the ground The proposed antenna effectively covers both 24 GHz (24-2484 GHz) and 5 GHz (515-5825 GHz) bands The measured peak gains are 13 dBi at 244 GHz and 28 dBi at 532 GHz

114 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023285
2022837
2021601
2020738
2019970
2018994