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 article, a two-section wideband hybrid coupler with short-circuited coupled lines in the middle branch is demonstrated. But the proposed two-sections coupler has the widest fractional bandwidth (FBW) than other two or even three section hybrid couplers modified from branch-line coupler.
Abstract: Two section wideband hybrid coupler with short-circuited coupled lines in the middle branch is demonstrated. The coupled lines are designed with a parallel-coupled 3-line, which has tight coupling and symmetric transmission phase over the center frequency. Without defected ground planes and a multilayer process, the proposed two-section coupler has the widest fractional bandwidth (FBW) than other two or even three section hybrid couplers modified from branch-line couplers. The designed wideband coupler has 55% FBW at the center frequency of 1.9 GHz. The bandwidth is limited by 1-dB power imbalance and the worst return loss, isolation, and phase imbalance within the bandwidth are 20.1 dB, 20.8 dB, and 3.2°, respectively.
42 citations
TL;DR: In this paper, a single-layer right-angle broadband transition between the substrate-integrated waveguide and air-filled standard rectangular waveguide is proposed and demonstrated at the V-band.
Abstract: A single-layer right-angle broadband transition between the substrate-integrated waveguide and air-filled standard rectangular waveguide is proposed and demonstrated at the V-band. An aperture coupled patch with two pairs of inductive posts is employed to form the transition. An impedance bandwidth wider than 48% for return loss less than −10 dB is achieved. The proposed back-to-back transition is fabricated on a single layer substrate using the printed circuit board technology. The measured results of back-to-back prototype show that the insertion loss of a single transition is less than 0.5 dB. The measured results show a good agreement with HFSS simulation results. This transition with compact size, wide bandwidth, and low cost can be used for a variety of millimeter-wave circuits and systems.
42 citations
TL;DR: In this paper, a waveguide-to-microstrip transition at millimeter-wave frequencies is proposed, which features two major transformations in sequence: an Eplane probe is chosen to conduct the transformation from waveguide to a suspended line, and a transitional pattern on the printed circuit board is employed to transform the suspended line into a shielded microstrip line.
Abstract: A design for waveguide-to-microstrip transitions at millimeter-wave frequencies is proposed in this letter It features two major transformations in sequence An E -plane probe is chosen to conduct the transformation from waveguide to a suspended line Then, a transitional pattern on the printed circuit board is employed to transform the suspended line into a shielded microstrip line To complete the design, a metallic buffer is introduced for the transformation between the shielded microstrip line and a microstrip line A proposed transition at W-band is presented based on the results from numerical simulations Two of the transitions in back-to-back connection are measured for the purpose of verification The results show that the proposed waveguide-to-microstrip transition can offer the advantages of low insertion loss, good return loss, broadband nature, and stable performance at millimeter-wave frequencies
42 citations
01 Dec 1990
TL;DR: In this paper, a matching slot pair which radiates all the incident power in a circularly-polarized wave is proposed and analyzed for use as a terminal in a leaky-wave slotted waveguide array.
Abstract: A matching slot pair which radiates all the incident power in a circularly-polarised wave is proposed and analysed for use as a terminal in a leaky-wave slotted waveguide array. The position and size of the slots are numerically optimised to suppress reflection and to realise a desired polarisation in the tilted beam direction, which contributes to improving the antenna efficiency. It is verified experimentally that the return loss is below -15 dB over 0.1 GHz at the 4 GHz band and the 3 dB axial ratio bandwidth is about 5% in the tilted beam direction. >
42 citations
TL;DR: In this article, the design of a wideband crossover that includes a pair of two-port and another pair of four-port microstrip-slot-line transitions is presented, and simulated and measured results of a developed 9 mm × 13 mm crossover on a substrate of 10.2 dielectric constant show less than 0.1 ns deviation in the group delay across the band from 4.8 to 7.2 GHz.
Abstract: The design of a wideband crossover that includes a pair of two-port and another pair of four-port microstrip-slotline transitions is presented. The utilized transitions are designed such that the resultant planar crossover has high isolation and return loss, and low insertion loss and deviation in the group delay across a wideband. The simulated and measured results of a developed 9 mm × 13 mm crossover on a substrate of 10.2 dielectric constant show less than 0.5 dB insertion loss, more than 15 dB return loss, more than 15 dB isolation and less than 0.1 ns deviation in the group delay across the band from 4.8 to 7.2 GHz (40% fractional bandwidth).
42 citations