Topic
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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TL;DR: In this paper, a novel CPW-fed wide planar slot antenna with an asymmetrical slot is proposed, which can reach an operating bandwidth of 2136 MHz with the center frequency operating at 2610 MHz for applications to various wireless bands.
Abstract: A novel CPW-fed wide planar slot antenna with an asymmetrical slot is proposed. The asymmetrical slot is square-like with the same widths but different lengths at the sides. By choosing suitable lengths of this asymmetrical slot, broadband operation can be obtained. From experimental results, the measured impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 2136 MHz with the centre frequency operating at 2610 MHz for applications to various wireless bands. In addition, the measured radiation patterns within this wide impedance bandwidth have the same polarisation planes and similar radiation characteristics. Each antenna gain within the application bands can be less than 1 dB
41 citations
TL;DR: In this paper, the authors present an excellent gain flatness CMOS power amplifier for UWB applications at 3.0-7.0 GHz in TSMC 0.18 μm CMOS technology.
Abstract: This letter presents an excellent gain flatness CMOS power amplifier (PA) for UWB applications at 3.0-7.0 GHz in TSMC 0.18 μm CMOS technology. The UWB PA proposed here employs a current-reused technique to enhance the gain at the upper end of the desired band, a shunt and a series peaking inductors with a resistive feedback at the second stage to obtain the wider and flat gain, while shunt-shunt feedback helps to enhance the bandwidth and improve the output wideband matching. The measurement results indicated that the input return loss (S11) less than -6 dB, output return loss (S22) less than -7 dB, and excellent gain flatness approximately 14.5 ±0.5 dB over the frequency range of interest. The output 1 dB compression of 7 dBm, the output third-order intercept point (OIP3) of 18 dBm, and a phase linearity property (group delay) of ±178.5 ps across the whole band were obtained with a power consumption of 24 mW.
41 citations
TL;DR: In this paper, a multirelare angle horn is optimized with an in-house software using finite-difference time-domain solver (BoR-FDTD) combined with a GA.
Abstract: A multiflare angle horn is optimized with an in-house software using Body of Revolution finite-difference time-domain solver (BoR-FDTD) combined with a genetic algorithm (GA). This antenna is optimized to demonstrate low cross polarization, low side-lobe level, good return loss, and excellent beam circularity over the 1700–2100-GHz frequency range. A prototype with a directivity of 31.7 dBi and a cross-polarization level below ${-}$ 22 dBi was measured at 1.9 THz with excellent agreement with calculation .
41 citations
TL;DR: In this paper, two compact wideband differential bandpass filters based on the double-sided parallelstrip line (DSPSL) and transversal signal-interaction concepts are proposed.
Abstract: Two compact wideband differential bandpass filters based on the double-sided parallel-strip line (DSPSL) and transversal signal-interaction concepts are proposed in this study Two transmission zeros and good harmonic suppression can be achieved for the first wideband differential DSPSL filter, because of the two transmission paths with different lengths for input/output ports In addition, another improved common suppression wideband differential DSPSL filter with two 180/ phase inverters is introduced Four λ /4 shorted lines are added to improve the passband transmission characteristic for the two differential DSPSL filters Two prototypes with 3/dB fractional bandwidth of 94 and 1176/, and return loss greater than 15/dB for differential mode are designed and fabricated The measured results show good agreement with the theoretical expectations
41 citations
TL;DR: By incorporating metamaterial in the conventional microstrip patch antenna, the size is reduced and the performance of antenna is improved and can be utilized in THz region.
Abstract: In this paper, the metamaterial based rectangular microstrip patch antenna is proposed and designed for THz applications. The proposed antenna is designed with the help of circular split ring resonator as unit cell which is considered as metamaterial. By incorporating metamaterial in the conventional microstrip patch antenna, the size is reduced and the performance of antenna is improved. The proposed antenna has the dimensions of 180 × 212 ×10 µm 3 which is designed on Quartz substrate which is fed by microstrip line feed technique. Additionally, the performance of the metamaterial antenna is analyzed by varying unit cell gap size and thickness. The antenna resonates at 1.02 THz which gives the return loss of -65 dB. Thus, the proposed antenna can be utilized in THz region.
41 citations