Iet Microwaves Antennas & Propagation最新文献

{"title":"A novel wideband slot loaded microstrip patch antenna through reallocation of TM1,0, modified TM0,2 and TM1,2 modes","authors":"Mohammad Hadi Moradi Ardekani,&nbsp;Shima Pashangeh","doi":"10.1049/mia2.12509","DOIUrl":"https://doi.org/10.1049/mia2.12509","url":null,"abstract":"<p>This paper presents a novel wideband microstrip patch antenna (MPA) characterised by a straightforward structure and operational efficacy across four resonances. The antenna consists of a truncated square patch, a coplanar capacitive feed and a slot on the patch. The square radiating patch is strategically truncated at its four corners to perturb the electric field distribution characteristic of the TM_0,2 mode, thereby facilitating the generation of a unidirectional far-field pattern. Extensive analysis has elucidated the mechanism through which corner truncation diminishes the electric field peak associated with the TM_0,2 mode at the centre, resulting in the transformation of the dual-beam pattern into a distinct single beam pattern. In addition, unlike conventional approaches that require additional components such as shorting pins, this approach reallocates three radiative modes—specifically TM_1,0, TM_0,2, and TM_1,2—resulting in a simplified structure. Finally, a coplanar capacitive feed and a slot are employed to boost the input impedance frequency bandwidth and generate the fourth resonance, respectively. Therefore, four adjacent resonances are simultaneously excited by this method and a wide frequency bandwidth of approximately 80% with stable unidirectional radiation pattern and same polarisation are fulfilled. A prototype of the antenna is fabricated and measured to validate the design procedure.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 11","pages":"860-868"},"PeriodicalIF":1.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12509","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737391","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":"The effect of temperature variation on the transient response of RF PIN diode limiters for very high frequency applications","authors":"Cornelius Johannes Botha,&nbsp;Tinus Stander","doi":"10.1049/mia2.12508","DOIUrl":"https://doi.org/10.1049/mia2.12508","url":null,"abstract":"<p>This work presents the effect of temperature change on the capacitance of silicon PIN diodes and the resulting change in performance of RF limiters at very high frequency (VHF). Device temperatures were varied between −25 ºC and 100 ºC, with small-signal parameters (including device capacitance) extracted at regular temperature increments and bias voltages from −20 Vdc to +3 Vdc using a multi-bias parameter extraction method. It was found that the junction capacitance of the four PIN diodes under investigation increases with temperature, as expected from carrier lifetime behaviour, while results also confirmed prior observations of an inverse relationship between forward-biased series resistance and temperature. Devices were subsequently tested in two different limiter topologies through high-power transient measurements. It was found that the combination of increased capacitance and decreased resistance with increasing temperature increases the transient spike leakage and decreases the flat leakage of a limiter. It was also concluded that, for VHF, an anti-parallel topology provides the best performance over a wide range of temperatures.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 11","pages":"849-859"},"PeriodicalIF":1.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12508","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724212","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 wearable circulator-like circularly polarised antenna for full-duplex wireless body area network applications","authors":"Ajeet Thakur,&nbsp;Ashwani Sharma,&nbsp;Ignacio J. Garcia Zuazola","doi":"10.1049/mia2.12507","DOIUrl":"https://doi.org/10.1049/mia2.12507","url":null,"abstract":"&lt;p&gt;A circulator-like high gain, unidirectional, dual circularly polarised (DCP) wearable antenna with a low specific absorption rate of 0.088 W/kg for 5.8 GHz industrial, scientific, and medical (ISM) band (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;5.725&lt;/mn&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;5.875&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $5.725-5.875$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; GHz) full-duplex wireless body area network (WBAN) applications is proposed. The DCP full-duplexing is achieved by a closed-loop feedback structure between its orthogonal-ports with enhanced axial ratio (AR) bandwidth and good impedance matching. The antenna is backed with a &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;7&lt;/mn&gt;\u0000 &lt;mo&gt;×&lt;/mo&gt;\u0000 &lt;mn&gt;7&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $7times 7$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; electromagnetic bandgap array that allows for improved directionality, AR and isolation between the ports. The cross-polarisation level above 17 dB is attained in the broadside direction, in both the E-plane and the H-plane, indicating good polarisation discrimination. Since the total power at each respective port is maintained and not halved (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${-}3$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; dB) with the measured port isolation of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;˜&lt;/mo&gt;\u0000 &lt;mn&gt;28&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $tilde 28$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; dB in real scenarios (with the potential evidence of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;˜&lt;/mo&gt;\u0000 &lt;mn&gt;34&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $tilde 34$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; dB) within the ISM band, that leads to a circulator-like antenna, meaning that a typically cascaded circulator/duplexer can be relieved and leave to the digital processing any self-interference challenge of full duplex systems through digital cancelation techniques, which alleviates the overall costs of RF hardware and eases integration. Even though dual linear polarization as well as DCP can be supported, the closed-loop feedback structure uses a port as Tx (RHCP) and the other one as Rx (LHCP) simultaneously with enhanced AR bandwidth. Without this structure, it would require a circulator/duplexer for DCP full-duplex operation and the associated added insertion losses and/or &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 ","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 11","pages":"838-848"},"PeriodicalIF":1.1,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12507","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737517","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":"Miniaturised ultra-wideband circular polarised koch fractal crossed dipole array","authors":"Won Min Choi,&nbsp;Taeyong Jeong,&nbsp;Dong Hwan Lee,&nbsp;Jun Hee Kim,&nbsp;Dong Geun Lee,&nbsp;Keum Cheol Hwang","doi":"10.1049/mia2.12506","DOIUrl":"https://doi.org/10.1049/mia2.12506","url":null,"abstract":"<p>Ultra-wideband (UWB) systems utilise a broad frequency spectrum to achieve high data transmission rates and enhanced precision, creating a demand for specialised UWB antennas. Circularly Polarised (CP) antennas are considered essential for maintaining robust performance under varied environmental conditions. Among them, the crossed dipole is effective for UWB CP applications, but its relatively large size could limit its use in various systems. A miniaturised crossed dipole design employing the Koch fractal structure is proposed and the measurement results are presented. The prototype antenna achieved an effective bandwidth covering 88% of the frequency range from 1.4 to 3.6 GHz. Additionally, a 4 × 4 array using this design was tested in the same frequency band, demonstrating beam-steering capabilities up to 30°. The proposed antenna has demonstrated effective deployment in diverse communication systems and phased array applications within ultra-wideband (UWB) CP environments.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 10","pages":"731-747"},"PeriodicalIF":1.1,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12506","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524527","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":"Embedded circuit analysis and design method for reconfigurable metasurface element","authors":"Bincai Wu,&nbsp;Xingqi Xuan,&nbsp;Yuqi Chen,&nbsp;Jun Wen,&nbsp;Qijun Hu,&nbsp;Shilie Zheng,&nbsp;Ian Pratt,&nbsp;Xiaonan Hui,&nbsp;Xianmin Zhang","doi":"10.1049/mia2.12505","DOIUrl":"https://doi.org/10.1049/mia2.12505","url":null,"abstract":"<p>Implementation of reconfigurable metasurfaces demands a complex structure. The design methodology for metasurface elements based on PIN diodes requires targeted optimisation tailored to the varying application environments and cannot be directly transplanted from one methodological approach to another. In addition, inclusion of varactors often imposes undesirable high-power consumption with complex analog drive circuitry. Furthermore, the design method for the reconfigurable metasurface element has not been simplified and unified, hindering the rapid deployment of metasurface applications. The authors propose a general design model based on low-power embedded circuitry for a multi-function metasurface element and give the corresponding numerical analysis. The authors present a reconfigurable method based on the general design model and prove that the method achieves independent regulation of amplitude and phase for the reflected electromagnetic wave. Through analysis of the sensitive area at the bottom of the embedded circuit, a gradient descent algorithm is proposed to find the optimised phase points according to device sensitivity of the application scenario and suitable strategy. Finally, the authors demonstrate that the designed metasurface element possesses phase control capability and decent phase consistency obtained via far-field scanning experiments. The proposed element design method will provide a theoretical reference for the integrated design of metasurface.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 11","pages":"819-829"},"PeriodicalIF":1.1,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12505","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724256","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":"Design of super wide band 3-way power divider/combiner","authors":"Nagarakshith Mungara,&nbsp;Kamla Prasan Ray","doi":"10.1049/mia2.12504","DOIUrl":"https://doi.org/10.1049/mia2.12504","url":null,"abstract":"<p>A 1:3-way power divider/combiner has been proposed for much improved bandwidth and isolation between output ports. The matching network for the super wide bandwidth frequency range is designed using a combination of the Klopfenstein taper and the triangular taper. The proposed design yields bandwidth from 1.5 to 20 GHz (18.5 GHz) for return loss better than 15 dB and isolation better than 20 dB. The insertion loss for the entire frequency band is 0.8 dB which is only 0.34 dB for the ultra-wide bandwidth (3.1–10.6 GHz). The maximum phase imbalance of 3.32° and amplitude imbalance of 0.199 dB between all the output ports have been achieved over the entire bandwidth. The simulated results have been validated experimentally.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 11","pages":"830-837"},"PeriodicalIF":1.1,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737423","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":"Phase-only transmit beampattern synthesis with sparse arrays via alternating optimisation-alternating direction of the multipliers method","authors":"Lifeng Li,&nbsp;Xingang Liu,&nbsp;Xiangrong Wang,&nbsp;Mengkai Hu,&nbsp;Yufeng Du","doi":"10.1049/mia2.12503","DOIUrl":"https://doi.org/10.1049/mia2.12503","url":null,"abstract":"<p>To get simultaneously sparse and constant modulus excitation to reduce the complexity of the array and the mutual effect of neighbouring elements, a novel algorithm via alternating optimisation-alternating direction of the multipliers method is developed. This method uses the total transmitting power as the objective function to optimise the sparsity and the amplitude of excitation simultaneously. Numerical results are provided to verify its effectiveness.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 10","pages":"791-800"},"PeriodicalIF":1.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12503","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524873","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":"Breakthrough design of power handling capability-enhanced slotted oversized substrate-integrated waveguide power divider/combiner considering corona and thermal effects","authors":"Masoumeh Souri,&nbsp;Nasser Masoumi,&nbsp;Mahmoud Mohammad-Taheri","doi":"10.1049/mia2.12502","DOIUrl":"https://doi.org/10.1049/mia2.12502","url":null,"abstract":"<p>An analysis and design of a new slotted power divider/combiner (PDC) that utilises an oversized substrate-integrated waveguide (OS-SIW) is presented to enhance power handling capability (PHC). It is interesting to note that, the power capability tolerance can be increased by increasing the width of structure and thickness of the substrate, although it may introduce higher-order modes. The paper is focused on improving PHC of PDC that propagates only the TE₁₀ mode while preventing the propagation of higher-order modes. Additionally, the PHC of the proposed structure is studied in detail. The air breakdown or the corona effect is a physical phenomenon that limits the Peak Power Handling Capability (PPHC) of a device. In slotted microwave components, the corona effect plays a crucial role in determining the PPHC, and it is closely related to environmental conditions such as pressure. Another limiting factor is self-heating, which affects the device's Average Power Handling Capability (APHC). The slotted OS-SIW PDC is designed on Rogers RO4003 laminate with 32mil thickness, offering a low profile with an overall OS-SIW PDC area of 170 × 55 mm². The measured results of the fabricated PDC showcase a range of desirable features. Moreover, the proposed structure in power divider mode exhibits significant improvements in APHC compared to those of the conventional Substrate-Integrated Waveguides structures, with respective enhancements of approximately 8.26% at 10 GHz (with a Fractional Band Width of 58.3%). These advantages are highly beneficial and hold great potential.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 10","pages":"779-790"},"PeriodicalIF":1.1,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12502","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524583","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":"Synthesis of sparse rectangular planar arrays with weight function and improved grey wolf optimization algorithm","authors":"Kui Tao,&nbsp;Bin Wang,&nbsp;Xue Tian,&nbsp;Qi Tang,&nbsp;Guihan Xie","doi":"10.1049/mia2.12499","DOIUrl":"https://doi.org/10.1049/mia2.12499","url":null,"abstract":"<p>The present article proposes a novel hybrid approach for addressing the synthesis problem of rectangular planar arrays under multiple constraints, through joint optimization of the weight function and the improved grey wolf optimization (IGWO) algorithm. Firstly, the grey wolf optimization (GWO) algorithm is improved by using tent chaotic mapping, nonlinear convergence factor, dominant wolf dynamic belief strategy, and opposition-based learning strategy to increase the population diversity and the ability to jump out of the local optimum. Secondly, the array elements are weighted using the weight function to generate the position distribution matrix, which reduces the thinned matrix optimization time and improves the optimization efficiency. Finally, the position distribution matrix is used to generate the thinned array, and the IGWO algorithm is applied to perform the sparse optimization with multiple constraints. The effectiveness of the method is verified through numerical simulation and full-wave simulation experiments, demonstrating its capability to enhance array antenna performance and reduce peak sidelobe level (PSLL). These experimental results hold significant engineering implications and provide valuable references for addressing the array distribution problem under multiple constraints.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 10","pages":"748-762"},"PeriodicalIF":1.1,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12499","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524576","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 compact half-mode substrate integrated waveguide bandpass filter based on highly confined slow waves with loading capacitive patches","authors":"Ning-Ning Wang,&nbsp;De-Wei Zhang,&nbsp;Qing Liu,&nbsp;Hang Qian,&nbsp;Wei-Zhe Qu","doi":"10.1049/mia2.12501","DOIUrl":"https://doi.org/10.1049/mia2.12501","url":null,"abstract":"<p>A novel slow-wave half-mode substrate integrated waveguide (HMSIW) bandpass filter (BPF) is proposed based on spoof surface plasmon polaritons (SSPPs) with loading capacitive patches (LCPs). The bandpass characteristics are achieved by etching complementary SSPPs on the metal patches of the HMSIW. SSPPs exhibit a slow-wave effect, which effectively reduces the overall size of the filter. At the same time, using proper LCPs between the HMSIW metal via and the complementary SSPPs structure, the effective dielectric constant of the HMSIW can be changed, reducing the low cutoff frequency and further facilitating the miniaturisation of size. A prototype of the proposed filter is designed, fabricated, and measured. The measured results show that the proposed filter has the in-band insertion loss of 1 and 3 dB passband range of 6.4–9.8 GHz.</p>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 10","pages":"771-778"},"PeriodicalIF":1.1,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12501","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524553","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}