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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 paper, a broadband rat-race ring coupler with a unit element at each port and an ideal phase inverter at one of the ring arms is proposed and analyzed.
Abstract: A novel broad-band rat-race ring coupler with a unit element at each port and an ideal phase inverter at one of the ring arms is proposed and analyzed. Design equations based on Chebyshev equiripple functions are derived. The design curves of equal or unequal power division are also presented. Theoretical data show that the bandwidth of unequal power division with a specific return-loss value increases as the power division ratio increases or decreases from unity. For a 180/spl deg/ hybrid with equal power division (3 dB) and 15-dB return loss, the proposed rat-race ring may have a bandwidth of 4:1. Three circuits of this novel rat-race ring are realized using finite-ground-plane coplanar waveguide. The measured results match very well with the theory.

93 citations

Journal ArticleDOI
TL;DR: The proposed antenna design consists of inverted patch structure with air-fllled dielectric, direct coaxial probe feed technique and the novel slotted shaped patch and by introducing the new multi- slotted patch, ofier a low proflle, high gain, broadband, and compact antenna element.
Abstract: A new design technique of microstrip patch antenna is presented in this paper. The proposed antenna design consists of inverted patch structure with air-fllled dielectric, direct coaxial probe feed technique and the novel slotted shaped patch. The composite efiect of integrating these techniques and by introducing the new multi- slotted patch, ofier a low proflle, high gain, broadband, and compact antenna element. A wide impedance bandwidth of 27.62% at i10dB return loss is achieved. The maximum achievable gain is 9.41dBi. The achievable experimental 3-dB beamwidth (HPBW) in the azimuth and elevation are 60.88 - and 39 - respectively at centre frequency.

93 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a compact multisection sharp-rejection microstrip low-pass filter, which consists of a microstrip line section and an interdigital capacitor.
Abstract: This letter presents a compact multisection sharp-rejection microstrip low-pass filter. Each section consists of a microstrip line section and an interdigital capacitor. The analysis for optimizing the attenuation poles by adjusting the finger number, and the width and length of the microstrip line section, is presented. The cascaded four-section low-pass filter has a return loss of better than 17 dB and an insertion loss of less than 0.7 dB from DC to 1.6 GHz. The rejection is better than 20 dB from 2.1 to 7.5 GHz.

93 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a compact broadband Gysel power divider with arbitrary power-dividing ratio, which significantly improves the bandwidth and reduces the circumference of the divider at the center frequency.
Abstract: A compact broadband Gysel power divider with arbitrary power-dividing ratio is proposed. This divider is derived from the conventional Gysel power divider by substituting an ideal phase inverter for the 180° phase shifter, which significantly improves the bandwidth and reduces the circumference to 1 λg evaluated at the center frequency. A wide range of power-dividing ratio (1-6.25) is supported by changing the impedance ratio of the transmission lines, while the dual-band impedance matching characteristic with frequency ratio (1-2.9) is obtained only by varying the impedances of the transmission lines (20-135 Ω). Closed-form equations are derived for design parameters. The ideal phase inverter is realized by two transitions: microstrip-to-slotline and slotline-to-microstrip transitions. By utilizing this phase inverter, two microstrip Gysel dividers with power-dividing ratios of 1:1 and 2:1 and operating at 1.5/2.5 and 1/2 GHz, respectively, are designed, fabricated, and measured. The measured results are in good agreement with the simulated ones. The first measured results show a bandwidth of 80% with better than 15-dB return loss and 29-dB isolation from 1.19 to 2.76 GHz. The second measured results show a bandwidth of 95.8% with better than 12-dB return loss and 24-dB isolation from 0.8 to 2.27 GHz. To the authors' knowledge, the most wideband Gysel power divider using microstrip technology is proposed for the first time.

93 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the design and implementation of a 60 GHz millimeter-wave RF-integrated-circuit-on-chip bandpass filter using a 0.18mum standard CMOS process.
Abstract: This letter presents the design and implementation of a 60-GHz millimeter-wave RF-integrated-circuit-on-chip bandpass filter using a 0.18-mum standard CMOS process. A planar ring resonator structure with dual-transmission zeros was adopted in the design of this CMOS filter. The die size of the chip is 1.148times1.49 mm2. The investigations of sensitivity to the insertion loss and the passband bandwidth for different perturbation stub sizes are also studied. The filter has a 3-dB bandwidth of about 12 GHz at the center frequency of 64 GHz. The measured insertion loss of the passband is about 4.9 dB, and the return loss is better than 10 dB within the passband.

93 citations


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