This study constructs stepped-impedance-stub lines for a dual-band branch-line coupler design with improved flexibility. The proposed structure demonstrates performance and compact size due to additional stepped-impedance stubs branches. developed synthesis method has two degrees of freedom which can be exploited miniaturize circuit and/or replace impractical impedances more realizable ones. Observations also show the advantage wide-range frequency ratio dual bands. current work fabricates...

A compact 38 GHz multibeam antenna array is presented for fifth-generation applications. beamforming network featuring a substrate integrated waveguide (SIW) multifolded 4 × 8 Butler matrix constructed. Benefiting from multilayer structure, the highly and assembled underneath radiators to achieve compactness. The is, then, combined with an 10 SIW slot-coupled patch establish four steering beams along H-plane accomplish size reduction of 53.5% in its longitudinal direction. For demonstration,...

In this letter, two differential-fed Ku-band 2 × patch antenna arrays with low cross polarization and wide bandwidths were developed using multilayer printed circuit board (PCB) technology. The elements in Design I fed differentially, whereas the patches II single-ended. However, is differential if array considered as a whole. experimental demonstration revealed that achieved 10-dB impedance bandwidth of 15.3%. measured gain was 10.41 dBi at 12.62 GHz -17.5 dB E-plane -20.2 H-plane....

This work presents a compact dual-band bandstop filter (DBBSF) that features two controllable stopbands at desired frequencies. Stepped-impedance resonators are utilized to realize the dual-stopband characteristics, and reduce size. The synthesis method is developed. An experimental circuit fabricated evaluated validate design concept. Measurements correlate well with simulation results, size 12.6% less than of standard DBBSF.

This paper presents a wideband 60-GHz antenna array with dual-resonant slot-patch structure. A multilayered low-temperature co-fired ceramic substrate was used for fabrication. half-wavelength resonant slot designed backed substrate-integrated waveguide (SIW) cavity to enhance the front radiation. The inverted microstrip center-fed structure easy signal excitation and superior impedance matching. parasitic patch also applied bandwidth gain enhancement. effects of SIW cavity-backed without...

A novel compact low-profile frequency selective surface (FSS) with controllable triband characteristics is presented. The proposed FSS consists of a stacked periodic array square loops and complementary apertures, respectively centered within wire grid an aperture grid, which can create three transmission poles two zeros. Controllable performance achieved, allowing the to transmit signal at 4 GHz while reflecting signals 6 9.5 GHz. Due structure, designed has reduced sensitivity incident...

In this paper, two 24 GHz horizontally polarized 1 × 8 patch antenna arrays were developed for automotive radar applications. The proposed offer the advantages of wide fan beams and high gain. far-field radiation patterns are widened in E-plane by disturbing near-field distribution each driven patch. Design I, is loaded with a parasitic loop, which functions as director E-plane. Due to directing effect, beamwidth can be increased. experimental verification prepared I showed that 130° gain...

This paper presents a cross-coupled bandpass filter with stacked substrate-integrated waveguide cavities on low-temperature cofired ceramic substrates. The proposed has local multipoint distribution service band novel same-side-feed input/output structure. Conventionally, structure generates only single pair of transmission zeros. can generate two pairs zeros beside the passband, thereby providing an excellent cutoff rate in stopband and improved frequency selectivity. additional is created...

In this paper, the integration design of a millimeter-wave filtering patch antenna array fed by substrate integrated waveguide (SIW) four-way anti-phase power divider is proposed. The multilayer handily implemented using intrinsic field distribution TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">20</sub> -mode in SIW proposed for miniaturization. signal lower cavity (SIWC) bandpass filter directly coupled to upper through coupling slot. used...

A compact dual-wideband bandpass filter featuring two controllable passbands is presented and experimentally validated. The proposed uses shorted stepped-impedance resonators to achieve capability minimum size. Design curves are given for the design. It found that frequency ratio of second first band has a wide achievable range. An experimental circuit fabricated evaluated validate design concept. measurement results correlated well with simulation results.

This paper presents a 60-GHz 4 × differential -fed patch antenna array using low-temperature cofired ceramic (LTCC) process. Wideband with L-shaped feeding scheme is adopted as element, while substrate integrated waveguide network low insertion loss applied for the integration of array. The differentialfed structure improves symmetry radiation patterns and reduces cross-polarization level significantly. To further suppress surface wave improve gain array, one kind soft proposed. equivalent...

A millimeter-wave series-parallel patch antenna array is presented, in which the dual-slot feeding structure handily implemented using intrinsic held distribution of TE20 mode substrate-integrated waveguide (SIW). One 28 GHz element fed by TE20-mode SIW hrst designed, achieving a 10 dB impedance bandwidth 10.2% and simulated peak gain 6.48 dBi. Based on element, 4 × with compact differential network developed accordingly. Due to novel SIW-based network, can achieve superior radiation...

A single-layer dual-circularly polarized cavity-backed patch filtenna with wide axial-ratio (AR) bandwidth is presented in this letter. The degenerated substrate-integrated waveguide (SIW) cavity modes TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">120</sub> /TE xmlns:xlink="http://www.w3.org/1999/xlink">210</sub> cooperating the TM xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> /TM xmlns:xlink="http://www.w3.org/1999/xlink">10</sub>...

A novel combined‐element frequency selective surface (FSS) is proposed for multi‐band applications. In this design, complementary square loops and meandering slots are combined to construct the composite FSS. The FSS provides three transmission poles two zeros, transmitting desired signals at 8.5, 11 16 GHz while reflecting unnecessary 9.6 13.1 GHz. This has advantages of flexible simple structure, easy processing low profile compared with traditional multi‐pole FSSs. design strategy...

This study involved developing a differential patch antenna array featuring wide bandwidth and improved radiation patterns. The proposed was fed by planar, aperture-coupled, L-shaped feeding structure to achieve wideband operation. the current distribution of resonant modes, substantially improving symmetry without excitation revealed an apparent deflected peak located at observation angle 10° 13.7 GHz. However, using differential-fed structure, location this returned 0°. measured results...

A wide-beam microstrip patch antenna and array ranging from 77 to 81 GHz are presented in this study for millimeter-wave applications. substrate-integrated-waveguide probe-fed was developed. For beamwidth enhancement, two I-shaped parasitic elements were placed next the main establish a three-element subarray. The current directions of opposite that patch, leading enhancement E -plane radiation pattern. proposed element has advantages coplanar structure, compact size, easy adjustment induced...

This letter designs a miniaturized low-profile metasurface (MS) antenna with compact size, large bandwidth, and stable gain. First, MS structure using the via-wall capacitive loading is investigated. Different from traditional square structure, this design loads via walls on both sides of patch to introduce equivalent parallel-plate capacitance, which can reduce size element by 50%. The stacked patches are then loaded horizontally along side additional edge capacitance for further 10%...

This paper presents a wideband and high-gain 4 × substrate integrated waveguide (SIW) cavity-backed patch array with simplified feeding network for operation in the millimeter-wave (mmW) band. Furthermore, to improve gain suppress sidelobe level, stepped horn is vertically each SIW patch. The proposed comprises eight series of 2 1 subarrays 4-way power distribution network. In addition, two types series-parallel are examined achieve low level. For verification, antenna was fabricated...

A novel circuit structure of dual-band bandstop fllters is proposed in this paper. This comprises two shunt-connected tri-section stepped impedance resonators with a transmission line between. Theoretical analysis and design procedures are described. The derived synthesis equations have degrees freedom which provide more ∞exibility fllter synthesis. Notably, three advantages the lie fact its increased nonuniform impedances, resulting compact size, wide range realizable frequency ratio,...

This letter presents a wideband sequential-rotated (SR) circularly polarized (CP) 2 × filtenna array with multiple radiation nulls for high out-of-band rejection level. A pair of arc-shaped via walls is introduced to split the degenerate modes TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">120</sub> /TE xmlns:xlink="http://www.w3.org/1999/xlink">210</sub> substrate integrated waveguide (SIW) cavity achieving CP characteristics. SIW...

A novel millimeter-wave 2 × substrate integrated waveguide (SIW) cavity-backed patch subarray with a simplified feeding structure is presented. Two higher order SIW cavity modes (quasi-TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">410</sub> and quasi-TE xmlns:xlink="http://www.w3.org/1999/xlink">330</sub> modes) are designed using eigenmode analysis to support patches in-phase radiation. The proposed has multiple resonant network. Moreover,...

Ka-band spectrum is relatively abundant and therefore attractive for services of satellite communication, targeting radar, wireless broadband access technologies. However, patch antenna difficult in realization because the accurate manufacturing indeed a challenge obtaining excellent performance at such high frequencies. This study develops three arrays operation 28 GHz. Two with 2×2 4×1 patches, respectively, are realized on microwave printed circuit boards (PCBs). The experimental PCB have...

New formulas are proposed for designing wideband parallel-coupled microstrip bandpass filters with improved prediction of bandwidth. When a fractional bandwidth /spl Delta/ is required, correction theta/=(/spl pi//2)(1/spl plusmn//spl Delta//2) incorporated into the formulation determining dimensions each coupled stage. Two Delta/=50% designed and fabricated to show improvement. The measurement shows very good agreement simulation.

In this paper, we present the dual-band bandstop filter design using tri-section stepped-impedance resonators. The proposed resonator has features of and size reduction due to its nonuniform impedance characteristic. There are two degrees freedom in synthesis equations, which can be used for circuit miniaturization changing impractical impedances into more realizable ones. An experimental was verified by implementation. It showed good agreement between simulated measured results. Compared...