Journal ArticleDOI

# A Compact Broadband Direct Coaxial Line to SIW Transition

26 Oct 2016--Vol. 26, Iss: 11, pp 894-896

TL;DR: In this article, a coaxial line to substrate integrated waveguide (SIW) broadband transition is presented, which directly transforms the TEM mode of coaxial lines to the fundamental TE10 mode of the SIW.

AbstractIn this letter, a novel coaxial line to substrate integrated waveguide (SIW) broadband transition is presented The transition is designed by connecting the inner conductor of a coaxial line to an open-circuited SIW The configuration directly transforms the TEM mode of a coaxial line to the fundamental TE10 mode of the SIW A prototype back-to-back transition is fabricated for X-band operation using a 0508 mm thick RO 4003C substrate with dielectric constant 355 Comparison with other reported transitions shows that the present structure provides lower passband insertion loss, wider bandwidth and most compact The area of each transition is $008\lambda _{g}^{2}$ where $\lambda _{g}$ is the guided wavelength at passband center frequency of $f_{0}= 105$ GHz Measured 15 dB and 20 dB matching bandwidths are over 48% and 20%, respectively, at $f_{0}$

##### Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors proposed a substrate-independent AFSIW manufacturing technology, enabling straightforward integration of high-performance microwave components into a wide range of general-purpose commercially available surface materials by means of standard additive (3-D printing) or subtractive (computer numerically controlled milling/laser cutting) manufacturing processes.
Abstract: Although all existing air-filled substrate integrated waveguide (AFSIW) topologies yield a substrate-independent electrical performance, they rely on dedicated, expensive, laminates to form air-filled regions that contain the electromagnetic fields. This paper proposes a novel substrate-independent AFSIW manufacturing technology, enabling straightforward integration of high-performance microwave components into a wide range of general-purpose commercially available surface materials by means of standard additive (3-D printing) or subtractive (computer numerically controlled milling/laser cutting) manufacturing processes. First, an analytical formula is derived for the effective permittivity and loss tangent of the AFSIW waveguide. This allows the designer to reduce substrate losses to levels typically encountered in high-frequency laminates. Then, several microwave components are designed and fabricated. Measurements of multiple AFSIW waveguides and a four-way power divider/combiner, both relying on a new coaxial-to-air-filled SIW transition, prove that this novel approach yields microwave components suitable for direct integration into everyday surfaces, with low insertion loss, and excellent matching and isolation over the entire [5.15–5.85] GHz band. Hence, this innovative approach paves the way for a new generation of cost-effective, high-performance, and invisibly integrated smart surface systems that efficiently exploit the area and the materials available in everyday objects.

7 citations

Journal ArticleDOI
, Xin Lv3, Lei Li1, Yi Wang6
TL;DR: The feedback between gate and drain, which is neglected in a previous work, is considered, which improves the accuracy of the coupling matrix model for transistors, and the relationship between the coupling matrices and the noise figure is established, which extends the coupling Matrix method to tackle noise-related circuit functions.
Abstract: This article presents a comprehensive active ${N}\,\,+ 4$ coupling matrix approach for the design of integrated filter–amplifier. The feedback between gate and drain, which is neglected in a previous work, is considered, which improves the accuracy of the coupling matrix model for transistors. More importantly, the relationship between the coupling matrix and the noise figure is also established, which extends the coupling matrix method to tackle noise-related circuit functions. Substrate integrated waveguide (SIW) filters are used to implement an integrated $X$ -band filter–amplifier design and to validate the design approach in terms of return loss, gain, and noise. Compared with rectangular waveguide, SIW is utilized for its appealing advantages, such as lower production cost, easier fabrication, and most importantly easier integration with active components. A second-order filtering circuit is applied to simultaneously match the input and output of the transistor. The integration reduces the losses from the intermediate networks in conventional designs, which is particularly important when the frequencies go higher. The measurements agree very well with the simulations in terms of S-parameters, gains, and noise figures.

4 citations

### Cites background from "A Compact Broadband Direct Coaxial ..."

• ...There has been extensive study of passive SIW components, such as filters [9]–[11], antennas [12], transitions [13], couplers [14], and power dividers [15]....

[...]

Journal ArticleDOI
28 Feb 2017
TL;DR: Substrate Integrated Waveguide (SIW) adalah saluran transmisi ying mampu menghantarkan sinyal frekuensi tinggi dengan kerugian yang kecil, tetapi memiliki kemampuan mengintegrasikan banyak komponen.
Abstract: Perkembangan sistim komunikasi wireless mendorong dipergunakannya spectrum frekuensi yang tinggi untuk mendapatkan peluang memberikan sistim dengan kecepatan transfer data yang tinggi. Substrate Integrated Waveguide (SIW) adalah saluran transmisi yang mampu menghantarkan sinyal frekuensi tinggi dengan kerugian yang kecil, tetapi memiliki kemampuan mengintegrasikan banyak komponen. Untuk melewatkan sinyal dari saluran planar ke SIW diperlukan struktur transisi yang memiliki factor refleksi yang kecil. Di penelitian ini pertama-tama dilakukan studi dasar struktur SIW dengan variasi besaran pentingnya, yaitu efek dari diameter silinder metal d dan jarak pitch antar silinder p dan studi terhadap macam-macam jenis dan bentuk transisi yang telah diperkenalkan berbagai publikasi dan dilakukan telaah terhadap realibilitasnya dan kemungkinan pengembangannya.

3 citations

Journal ArticleDOI
TL;DR: In this article, a center-fed substrate integrated waveguide (SIW) inclined slot array antenna is designed for a one-dimensional active phased array and a novel coaxial-to-SIW transition is employed to realize the central feed for enhancing bandwidth.
Abstract: In this paper, a center-fed substrate integrated waveguide (SIW) inclined slot array antenna is designed for a one-dimensional active phased array. A novel coaxial-to-SIW transition is employed to realize the central feed for enhancing bandwidth. The antenna prototype printed onto a single-layer Rogers 5870 is composed of 32 × 16 inclined slots working at Ku-band. As shown in measured result, the bandwidth with return loss < −10 dB is from 16.6 to 17.1 GHz, and the sidelobe levels of arrays are below −24.8 dB at 16.8 GHz in H planes. The measured gain is 31.8 dB at 16.8 GHz with the aperture efficiency of 65%. The active phased array is assembled by an antenna and 32 Tx/Rx modules, and the measured results show that the main lobe can obtain a wide-angle scanning from −45 to 45 degrees in E planes. The antenna array is suitable for low profile small active phased array radars and communication systems that require spatial wide-angle scanning.

2 citations

### Cites background from "A Compact Broadband Direct Coaxial ..."

• ...A structure of coaxial line to SIW transition is depicted in [14], which is located at one end of the SIW....

[...]

Proceedings ArticleDOI
01 Jan 2018
TL;DR: In this article, a coaxial cable to suspended substrate (SS) transmission line transition is presented, which achieves more than 19 dB return loss and less than 0.1 dB insertion loss over 18-22 GHz (20% fractional bandwidth).
Abstract: A coaxial cable to suspended substrate (SS) transmission line transition is presented. The structure is simple to manufacture, consisting of two cascaded SS transmission lines and an orthogonal coaxial cable interface. Simulations show that the transition achieves more than 19 dB return loss and less than 0.1 dB insertion loss over 18–22 GHz (20% fractional bandwidth).

2 citations

More filters
Book
01 Jan 1951

2,310 citations

### "A Compact Broadband Direct Coaxial ..." refers background in this paper

• ...The metallic post offers an equivalent shunt inductance which depends on its position along width of the SIW [15]....

[...]

Journal ArticleDOI
, Ke Wu1
TL;DR: In this article, a new method of analysis is presented for the determination of complex propagation constants in substrate integrated waveguides (SIWs) by making use of the concept of surface impedance to model the rows of conducting cylinders, and the proposed model is then solved by combining a method of moments and a transverse resonance procedure.
Abstract: A new method of analysis is presented in this paper for the determination of complex propagation constants in substrate integrated waveguides (SIWs) This method makes use of the concept of surface impedance to model the rows of conducting cylinders, and the proposed model is then solved by combining a method of moments and a transverse resonance procedure The proposed method is further applied to extract results in terms of parametric curves and graphs which demonstrate fundamental and interesting wave guidance and leakage properties of this type of periodic waveguide Useful design rules are extracted from this analysis, suggesting that appropriate design parameters and regions should be carefully selected for practical applications In addition, comprehensive review and comparisons with published results are also presented to show the performance and accuracy of the proposed modeling technique Practical measurements of fabricated samples with different levels of loss have confirmed the accuracy of this new method and validity of design rules

660 citations

### "A Compact Broadband Direct Coaxial ..." refers background in this paper

• ...THE substrate integrated waveguide (SIW) is a planar form of the traditional rectangular waveguide, compatible with printed circuit board (PCB) fabrication procedure [1]–[2]....

[...]

Proceedings ArticleDOI
, Bing Liu1, Ke Wu1
01 Sep 2006
TL;DR: In this article, a new guided wave structure of half mode substrate integrated waveguide (HMSIW) for microwave and millimeter wave application is proposed for the first time.
Abstract: In this paper, a new guided wave structure of half mode substrate integrated waveguide (HMSIW) for microwave and millimeter wave application is proposed for the first time. The principle of the HMSIW is described, and its propagation characteristics are simulated and measured. The measured results at microwave and millimeter wave bands show that the attenuation of it is less than that of conventional microstrip and even SIW, but its size is nearly half of a SIW. Thus, we can further compress the size of a microwave or millimeter wave integrated circuit based on this new guided wave structure.

345 citations

### "A Compact Broadband Direct Coaxial ..." refers methods in this paper

• ...The open-end behaves in a similar way as the magnetic wall of a half-mode SIW [13]....

[...]

Proceedings ArticleDOI
23 May 2010
TL;DR: In this paper, the microstrip-to-substrate integrated waveguide (SIW) transition is decomposed in two distinct parts, i.e., microstrip taper and SIW step.
Abstract: This paper presents design equations for the microstrip-to-Substrate Integrated Waveguide (SIW) transition. The transition is decomposed in two distinct parts: the microstrip taper and the microstrip-to-SIW step. Analytical equations are used for the microstrip taper. As for the step, the microstrip is modeled by an equivalent transverse electromagnetic (TEM) waveguide. An equation relating the optimum microstrip width to the SIW width is derived using a curve fitting technique. It is shown that when the step is properly sized, it provides a return loss superior to 20 dB. Three design examples are presented using different substrate permittivity and frequency bands between 18 GHz and 75 GHz. An experimental verification is also presented. The presented technique allows to design transitions covering the complete single-mode SIW bandwidth.

264 citations

### "A Compact Broadband Direct Coaxial ..." refers methods in this paper

• ...A microstrip line-to-SIW [4]–[5] or a CPW-to-SIW [6]–[7] transition is commonly used to excite the TE10 mode of a SIW....

[...]

Proceedings ArticleDOI
01 Jan 2010

226 citations