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Xplore Articles related to Slot Lines

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Numerical and experimental study of the voltage excited along a slotline by a current source

Radio Science, 2010

This paper presents an analysis of a slotline excited by a current source connected across the slot. The method of moments applied in the spectral domain is used. As a result, the voltage of a wave composed of bound and leaky modes as well as residual waves is calculated along the slot. Interesting behavior of the voltage wave in the ...


Novel septuple-mode balanced filter with enhanced selectivity and extended upper-stopband using multi-mode slotline structure

2016 IEEE MTT-S International Microwave Symposium (IMS), 2016

In this paper, a seven-pole balanced filter is presented with sharp skirt and extended upper-stopband in differential-mode (DM) response. Based on slotline resonator published in previous works, boundary conditions are briefly discussed in order to explain the mechanism of multi-mode DM transmission and intrinsic high common-mode (CM) suppression in the microstrip-slotline (MS) conversion. Then a λ/2 stepped-impedance resonator (SIR) is ...


A wideband vertical microstrip-to-microstrip transition on two dual-mode slotline resonators

2015 European Microwave Conference (EuMC), 2015

A wideband vertical microstrip-to-microstrip transition has been proposed in this paper. Two dual-mode slotline resonators are placed on the common ground between the top- and bottom-layer to construct a novel wideband transition. The first two resonant modes in the slotline resonators are excited and utilized by coupling or feeding them at specific positions. After resonators themselves and their coupling scheme ...


Design of ultra-wideband tapered slot antenna by using binomial impedance transformer

2015 IEEE Conference on Antenna Measurements & Applications (CAMA), 2015

The simple method for designing the taper profile of tapered slot antenna (TSA) which is based on the multi-section quarter-wave binomial impedance transformer is presented. This transformer can use to design taper profile that does not involve using time consuming optimization. By using this design procedure, the wideband microstrip-to-slotline feed has been designed. To demonstrate the validity of the method, ...


Planar cross-polarized transition to a circular waveguide feed for a 61 GHz dielectric antenna

2015 German Microwave Conference, 2015

This paper presents a novel concept for a planar cross-polarized transition to a 61 GHz dielectric lens antenna. The transition to the circular waveguide antenna feed consists of a combination of a microstrip line and a slot line. Each of these planar waveguides excites the H11mode in the circular waveguide with a 90± polarization angle to one another. The developed ...


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Educational Resources on Slot Lines

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IEEE-USA E-Books

  • Numerical and experimental study of the voltage excited along a slotline by a current source

    This paper presents an analysis of a slotline excited by a current source connected across the slot. The method of moments applied in the spectral domain is used. As a result, the voltage of a wave composed of bound and leaky modes as well as residual waves is calculated along the slot. Interesting behavior of the voltage wave in the neighborhood of the source is shown. Both numerical and measured results are given.

  • Novel septuple-mode balanced filter with enhanced selectivity and extended upper-stopband using multi-mode slotline structure

    In this paper, a seven-pole balanced filter is presented with sharp skirt and extended upper-stopband in differential-mode (DM) response. Based on slotline resonator published in previous works, boundary conditions are briefly discussed in order to explain the mechanism of multi-mode DM transmission and intrinsic high common-mode (CM) suppression in the microstrip-slotline (MS) conversion. Then a λ/2 stepped-impedance resonator (SIR) is loaded on the center of traditional slotline resonator for enhanced DM selectivity. Several T-shape and L-shape short-circuited stubs are introduced for extended DM upper-stopband. The proposed balanced filter is simulated, fabricated and measured afterwards. Finally, measured and simulated results are in good agreement, indicating favorable performances such as 7-mode bandpass response with enhanced selectivity, extended upper-stopband rejection and intrinsic high CM suppression.

  • A wideband vertical microstrip-to-microstrip transition on two dual-mode slotline resonators

    A wideband vertical microstrip-to-microstrip transition has been proposed in this paper. Two dual-mode slotline resonators are placed on the common ground between the top- and bottom-layer to construct a novel wideband transition. The first two resonant modes in the slotline resonators are excited and utilized by coupling or feeding them at specific positions. After resonators themselves and their coupling scheme are decided by the split-mode graph, I/O coupling structures are implemented by using the microstrip-to-slotline cross- shaped transitions. Finally, the well-designed transition is fabricated and measured to support the validity of the structure. The measured transition has an operating bandwidth of 100.0% with in-band return loss higher than 10.8 dB.

  • Design of ultra-wideband tapered slot antenna by using binomial impedance transformer

    The simple method for designing the taper profile of tapered slot antenna (TSA) which is based on the multi-section quarter-wave binomial impedance transformer is presented. This transformer can use to design taper profile that does not involve using time consuming optimization. By using this design procedure, the wideband microstrip-to-slotline feed has been designed. To demonstrate the validity of the method, the simulated and measured results of TSA in the frequency range from 3 - 11 GHz are proposed. The results show good agreement between simulation and measurement.

  • Planar cross-polarized transition to a circular waveguide feed for a 61 GHz dielectric antenna

    This paper presents a novel concept for a planar cross-polarized transition to a 61 GHz dielectric lens antenna. The transition to the circular waveguide antenna feed consists of a combination of a microstrip line and a slot line. Each of these planar waveguides excites the H11mode in the circular waveguide with a 90± polarization angle to one another. The developed double layer transition topology was realized on a Rogers 5880 substrate employing the microstrip line on the top and the slot line on the bottom layer. The concept was implemented and tested on a circular waveguide-fed dielectric lens antenna for a 61 GHz radar system. Experimental results show a transition loss of around -2 dB for the microstrip and -3 dB for the slot line feed with excellent crosstalk suppression greater than 40 dB for the two polarization channels. The bandwidth of the built crosspolarized transition is greater than 10 GHz. The results prove that the novel transition concept is very well suited for compact, broadband and low cost polarimetric millimeter-wave radar systems.

  • Strip-Loaded Slotline Resonator for Compact Differential-Mode Bandpass Filters with Improved Upper Stopband Performance

    In this letter, a strip-loaded slotline resonator (SLSR) is presented and applied to design a class of novel differential mode (DM) bandpass filter (BPF) with improved upper stopband, compact size and intrinsic common-mode (CM) suppression. This DM BPF is composed of three paralleled coupled SLSRs, and two differential tapping-coupled ports. As the loaded-strip length is stretched, the 1st resonant frequency gradually falls down so as to make the SLSR compact in size, while the 2nd one is tremendously raised towards the 3rd one so as to widen the spacing between the 1st and 2nd resonant frequencies or achieve a wide upper stopband of the proposed DM BPF. To verify the proposed technique, a third-order DM BPF prototype has been designed and fabricated. Both the simulated and measured results have demonstrated good DM upper stopband and CM rejection in addition to compact size.

  • The Design and Simulation of a Compact Vivaldi Antenna for UWB Applications

    A miniaturized Vivaldi is presented in this paper. A novel size-reduced balun is adopted; resistors are loaded at the end of radiation structure; additional comb slots are used at the edge of the antenna. The dimension of the proposed antenna is 68.5mm(height)×74mm (width)×0.508mm(thickness). The simulation shows that the bandwidth covers the band from 0.8GHz to 18GHz(return loss<;-10dB), while the realized gain varies from -3.4dBi to 8dBi. Therefore, the proposed compact antenna can be applied to the size-restricted platforms.

  • Compact Low-Loss Wideband Differential Bandpass Filter With High Common-Mode Suppression

    Compact low-loss wideband differential bandpass filters are presented in this letter. The proposed filters are constructed by a pair of multilayer differential microstrip-slotline transitions (MDMSTs) and microstrip line resonators. Wideband common-mode suppression and low insertion loss can be easily achieved by employing the MDMSTs. Wideband differential-mode passband and sharp notched band can be obtained by combining the microstrip resonators at the middle and the two sides with the pair of MDMSTs, respectively. The demonstrated filters with a compact size of 24 mm × 12 mm (0.56λg× 0.28 λg) exhibits a fractional bandwidth of 115% centered at 4.25 GHz (f0) with minimum insertion loss of 0.43 and 20 dB common-mode suppression from 1 to 10 GHz (2.35 f0).

  • Wideband Out-of-Phase Filtering Power Divider with High Selectivity

    A new design of wideband out-of-phase filtering power divider (FPD) with high selectivity is presented on the basis of a vertical microstrip-slotline- microstrip (M-S-M) transition in this paper. By wisely replacing the traditional quarter-wavelength open-circuited microstrip line in the M-S transition with an open/short stepped-impedance resonator, two transmission zeros (TZs) are generated, resulting in a controllable bandwidth and sharp skirt selectivity of the FPD. To well isolate the out-of-phase signals between two output ports, an isolation network consisting of grounded resistor and a microstrip line is located on the differential symmetrical plane. Equations for determination of TZs are derived from the equivalent schematic circuit. For demonstration, a prototype centered at 2.83 GHz with 3-dB fractional bandwidth of 64.8% is designed, fabricated and tested. Both simulated and measured results are displayed to verify the feasibility of our proposed design concept.

  • Compact Dual-Port Polarization-Reconfigurable Antenna With High Isolations for MIMO Application

    This letter proposes the design of a dual-port microstrip patch antenna with polarization reconfigurability features. The reconfigurability is realized through the modification of the feed network. The antenna consists of a circular-shaped patch on the upper substrate as a radiating element, and a coplanar-waveguide (CPW) slotline transmission located in the ground plane. To obtain a good impedance matching, the CPW slotline is terminated with a tapered impedance transformer. Dual ports are constructed by utilizing the CPW feeding structure and the odd and even feedline modes of the CPW. Four p-i-n diodes are used as switches to alter the flow of the current. The p-i-n diodes are placed on the CPW transmission slotline interjunction. Consequently, the excited polarization can be altered and determined, depending on the switch configurations. This antenna demonstrates good port-to-port isolation and a compact structure and is suitable to be used in systems that operate in a wireless local area network (WLAN) frequency band.



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