Iet Microwaves Antennas & Propagation最新文献

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148088737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Amplitude Tapered Leaky-Wave Antennas in Bent Additively Manufactured Nonradiative Dielectric Waveguides","authors":"Kevin Kipruto Mutai,&nbsp;Qiang Chen","doi":"10.1049/mia2.70100","DOIUrl":"10.1049/mia2.70100","url":null,"abstract":"<p>In this article, we introduce an inexpensive leaky-wave antenna (LWA) design that is simple to fabricate and that is based on a nonradiative dielectric waveguide (NRDWG) platform. Although NRDWG based LWA designs have been demonstrated, these works have focused on coupling a fast wave propagating within the dielectric to a longitudinal slot located at some offset distance from the dielectric which necessitates the fabrication of new metallic parts should the design requirements of the LWA need to be changed. Therefore in this work we show that it is also possible to couple the fast wave directly to free space through a slot cut directly above the dielectric. Furthermore, by leveraging 3-D printing to flexibly taper the complex longitudinal propagation constant, we also show that the same metallic parts can be reused for LWAs with completely different radiation pattern characteristics resulting in a practical LWA design approach with vastly lowered fabrication costs, lead time and design complexity. To validate this concept, we extract the longitudinal propagation constant from a modified transverse equivalent network model of the LWA and compare it against values obtained from full-wave simulations. We then use these extracted values of the propagation constant to design, fabricate and experimentally characterise two one-dimensional (1-D) LWAs with an untapered and tapered amplitude distribution along the aperture to verify the proposed design concept.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147668272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Octave-Band Orthomode Transducer Design Incorporating Either T-Junctions or Magic-Ts: Performance Comparison and Manufacturing Aspects","authors":"Nasrin Tasouji,&nbsp;Sara Salem Hesari,&nbsp;Doug Henke,&nbsp;Dave Atherton,&nbsp;Ivan Wevers,&nbsp;Adam Densmore,&nbsp;Jens Bornemann","doi":"10.1049/mia2.70099","DOIUrl":"10.1049/mia2.70099","url":null,"abstract":"<p>This paper presents an octave-band orthomode transducer (OMT) based on ridged waveguide technology, designed and analysed with both T-junction and Magic-T configurations for performance comparison. The results demonstrate that the Magic-T junction provides superior performance, owing to its inherent characteristics, and outperforms conventional T- and Y-junctions commonly employed for signal recombination in OMTs. The proposed OMT, integrated with a Magic-T and fabricated using CNC machining, achieves octave-band operation from 20 to 40 GHz (2:1). This design addresses fabrication and wideband performance challenges by minimising the number of layers required for CNC machining and by identifying an optimal approach for integrating ridged waveguides throughout the overall OMT structure. The measurement results confirm the OMT's suitability for wideband applications and demonstrate its potential for possible future integration into the next-generation Very Large Array (ngVLA) radio telescope.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70099","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"360° Beam-Steering Substrate-Integrated Waveguide Horn Antenna Loaded Monopole Array for Millimetre-Wave Communications","authors":"Guo Yang,&nbsp;Hongqiang Shi,&nbsp;Xiaocong Li,&nbsp;Lei Ge,&nbsp;Ruqi Xiao,&nbsp;Shi-Shan Qi,&nbsp;Wen Wu","doi":"10.1049/mia2.70091","DOIUrl":"10.1049/mia2.70091","url":null,"abstract":"<p>A millimetre-wave tilting beam-steering substrate-integrated waveguide (SIW) horn antenna is proposed for millimetre-wave communications. First, a six-port reconfigurable SIW feeding network using PIN diodes is designed for beam-steering and each output terminal is directly connected to a horn antenna. Second, to address problems of impedance matching and narrow bandwidth, the horn antenna aperture is loaded with extra substrates and a dipole array. Furthermore, a loaded U-shaped wall improves the antenna gain and front-to-back ratio (FTBR) by suppressing backward radiation. Finally, to enhance the compactness of the previous SIW antenna and generate tilting beams, a tilting beam-steering SIW horn antenna is proposed and fabricated to tilt the beam in the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>θ</mi>\u0000 <mo>=</mo>\u0000 <mn>60</mn>\u0000 <mo>°</mo>\u0000 </mrow>\u0000 <annotation> $theta =60{}^{circ}$</annotation>\u0000 </semantics></math> direction. This antenna incorporates a monopole array and a metal reflector ground. The measured results indicate an impedance bandwidth with <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>|</mo>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mn>11</mn>\u0000 </msub>\u0000 <mo>|</mo>\u0000 <mo>&lt;</mo>\u0000 <mo>−</mo>\u0000 <mn>10</mn>\u0000 </mrow>\u0000 <annotation> $vert {S}_{11}vert &lt; -10$</annotation>\u0000 </semantics></math> dB from 25.60 to 27.72 GHz, a peak gain of 10.5 dBi, and an FTBR exceeding 15 dB. The proposed antenna, which covers a beam-steering range of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>360</mn>\u0000 <mo>°</mo>\u0000 </mrow>\u0000 <annotation> $360{}^{circ}$</annotation>\u0000 </semantics></math> in the azimuth plane and up to <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>45</mn>\u0000 <mo>°</mo>\u0000 </mrow>\u0000 <annotation> $45{}^{circ}$</annotation>\u0000 </semantics></math> in the elevation plane, offers a simple and compact structure, high FTBR and full directional coverage without blind spots.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148087769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148087768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wideband and Frequency-Reconfigurable Loop Antenna for Sub-6 GHz Applications","authors":"Amir Jafargholi,&nbsp;Romain Fleury","doi":"10.1049/mia2.70096","DOIUrl":"10.1049/mia2.70096","url":null,"abstract":"<p>This paper presents a horizontally polarised, low-profile loop antenna that operates in two distinct modes: a wideband (WB) and a frequency-reconfigurable (FR) mode. The antenna is based on a circular segmented loop integrated with varactor diodes and a compact printed microstrip balun, whereas the frequency control is realised through the adjustment of the balun line width. In the WB mode, the antenna exhibits an exceptionally large impedance bandwidth, ranging from 2.9 to 3.9 GHz (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>|</mo>\u0000 <msub>\u0000 <mi>S</mi>\u0000 <mn>11</mn>\u0000 </msub>\u0000 <mo>|</mo>\u0000 <mo>&lt;</mo>\u0000 <mo>−</mo>\u0000 <mn>10</mn>\u0000 </mrow>\u0000 <annotation> $vert {S}_{11}vert &lt; -10$</annotation>\u0000 </semantics></math> dB), with a maximum realised gain of 2.7 dBi. Over a substantial range of this bandwidth, the structure provides a very low back-lobe level, making the antenna particularly suitable for beam-switching applications. In the FR mode, the antenna keeps an omnidirectional radiation pattern, whereas its operating frequency can be continuously tuned from 1.95 to 2.45 GHz simply by adjusting the capacitance of the varactor diodes. The proposed design achieves high radiation efficiency—exceeding <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>80</mn>\u0000 <mi>%</mi>\u0000 </mrow>\u0000 <annotation> $80%$</annotation>\u0000 </semantics></math> in the FR mode and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>75</mn>\u0000 <mi>%</mi>\u0000 </mrow>\u0000 <annotation> $75%$</annotation>\u0000 </semantics></math> in the WB mode. Owing to its compact profile, high efficiency, beam controllability and flexible tuning capability, the antenna is a promising candidate for portable and wireless communication systems below 6 GHz, including emerging 5G applications.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Nonstationary Geometry-Based Model for Channel Characterisation in Vactrains Scenarios Using Leaky Coaxial Cables","authors":"Kai Wang,&nbsp;Jiahui Qiu,&nbsp;Jiachi Zhang,&nbsp;Liu Liu,&nbsp;Tao Zhou","doi":"10.1049/mia2.70097","DOIUrl":"10.1049/mia2.70097","url":null,"abstract":"<p>The vacuum tube ultra-high-speed flying train (vactrain) is regarded as a promising candidate for future railway transportation, while the distinctive operating environment and ultra-high-speed conditions exact rigorous demands on the performance of the train-to-ground wireless communication system. For the optimal design of the communication system, a comprehensive understanding of channel characterisation is crucial, and an accurate channel model requires investigation. Therefore, in this paper, we propose a three-dimensional (3-D) multi-source geometric-based stochastic model (GBSM) for the vacuum tube scenario using leaky coaxial cables (LCX). The electric field distribution of LCX is deduced by equating the periodic slots to multiple magnetic dipole antennas. Based on this, the theoretical models for line-of-sight (LoS) and nonline-of-sight (NLoS) components of channel impulse response (CIR) are derived, respectively. Furthermore, the closed-form expressions of the multi-link spatial-temporal correlation functions, encompassing the spatial cross-correlation function (CCF) and temporal autocorrelation function (ACF), are further derived and examined at 900 and 1800 MHz. The simulation results indicate that in the vactrain scenario, the wireless channel exhibits nonstationary characteristics. Furthermore, at 1800 MHz, the channel correlation decreases more rapidly than at 900 MHz, and the stationary interval of the channel is shorter.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70097","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147643189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148081617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Band Frequency Selective Surface With Good Angular Stability Based on Miniaturised Periodic Triangular Structures","authors":"Shuang Chen,&nbsp;Chunfeng Fan,&nbsp;Jintu Sun,&nbsp;Yan Liu,&nbsp;Qing Liu,&nbsp;Yan Zhang,&nbsp;Qingfeng Zhang,&nbsp;Ke Gong","doi":"10.1049/mia2.70098","DOIUrl":"10.1049/mia2.70098","url":null,"abstract":"<p>A novel dual-band frequency selective surface with good angular stability based on miniaturised periodic triangular structures is proposed. The triangular structure is realised by the top and bottom layers of triangular ring-shaped meander line metal layers, as well as the middle triangular ring-shaped slot metal layer. Characteristics of angular stability are analysed and validated by HFSS simulations and experimental results. To elucidate the operating principle, equivalent circuit models are first constructed for each metal layer and the overall model is derived through a series-parallel connection. The designed FSS provides two passbands, with operating frequencies ranging from 1.66 to 1.79 GHz and from 3.39 to 3.96 GHz. The electrical size has a compact unit size 0.098<i>λ</i>₀ × 0.098<i>λ</i>₀. Compared to the rectangular structure FSS with a similar metal layer, the triangular structure FSS achieves a 11.2% size reduction. The test results are in good agreement with the simulation results and show excellent angular stability at an incidence angle of 55° under different polarisation conditions. Compared to existing research results, this frequency selective surface offers significant advantages in miniaturisation, showing promising prospects for miniaturisation research and applications.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.70098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147643188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}