Coaxial Line Technology Research Articles

Design of a Dual-Band Planar Sleeve Monopole Antenna With the Substrate-Integrated Coaxial Line Technology

Design of a Dual-Band Planar Sleeve Monopole Antenna With the Substrate-Integrated Coaxial Line Technology

A Low-Cost Reflection Oscillator Using Substrate Integrated Coaxial Line Technology

A Low-Cost Reflection Oscillator Using Substrate Integrated Coaxial Line Technology

Low-Cost Center-Fed Slot Array Based on Gap Waveguide MLW Coaxial Line Technology for E-Band Automotive Radar

Low-Cost Center-Fed Slot Array Based on Gap Waveguide MLW Coaxial Line Technology for E-Band Automotive Radar

High-Directivity and Low-Loss Directional Couplers Based on Empty Substrate Integrated Coaxial Line Technology

High-Directivity and Low-Loss Directional Couplers Based on Empty Substrate Integrated Coaxial Line Technology

Compact Self-Shielding Components for Beamforming Networks Implemented in Substrate Integrated Coaxial Line Technology

Compact Self-Shielding Components for Beamforming Networks Implemented in Substrate Integrated Coaxial Line Technology

A Circularly Polarized Antenna Array with Gain Enhancement for Long-Range UHF RFID Systems

A 2 × 2 circularly polarized (CP) sequential rotation microstrip patch antenna array with high gain for long-range ultra-high frequency (UHF) radio frequency identification (RFID) communication is proposed in this paper. In order to meet the operational frequency band requirement of 840–960 MHz and, at the same time, achieve enhanced broadside gain, a two-level sequential rotation structure is developed. Series power divider is used as the basic element of the feed network that is implemented with the substrate-integrated coaxial line technology for minimizing radiation losses. The manufactured prototype exhibits a peak gain of 12.5 dBic at 900 MHz and an axial ratio (AR) bandwidth (AR ≤ 3 dB) of 18.2% from 828 to 994 MHz. In comparison with the state-of-the-art, the proposed antenna shows an excellent gain/size trade-off.

Design of broadband and dual‐polarized dielectric‐filled pyramidal horn antenna based on substrate‐integrated waveguide

AbstractA broadband and dual‐polarized dielectric‐filled pyramidal horn antenna based on substrate‐integrated waveguide technology is proposed for Ku‐band (uplink and downlink frequency) bands applications in this letter. The proposed antenna is manufactured by using low‐cost printed circuit boards process. The horn walls are formed by metalized rectangular slots, and the opening of the horn antenna is discretely flared from the bottom to the top layer. In addition, differential feeding networks based on substrate‐integrated coaxial line technology are adopted in the design to realize dual‐linear polarizations. The designed antenna produces horizontal polarized (HP) and vertical polarized (VP) waves in the frequency band of 12.25‐12.75 and 14.0‐14.5 GHz, respectively. The developed antenna has been fabricated and tested. According to the experimental results, the 10‐dB impedance bandwidth of 19.9% is achieved for the horn antenna, and an average gain of around 7.7 dBi with 12.3‐12.9 GHz for HP, and an average gain of around 9.2 dBi with 13.9‐14.5 GHz for VP. The proposed antenna element can be used in arrays to meet the requirements of low side lobes for horn arrays in satellite communications applications.

A low phase noise oscillator based on substrate integrated coaxial line technology

In this article, a miniaturized resonator based on substrate integrated coaxial line technology (SICL) is presented. The SICL resonator consists of a hairpin half-wavelength open-ended coaxial line element and two symmetrical parallel coaxial feed lines. The gap between the feed lines and the hairpin element can be adjusted properly to obtain a steep phase change, which can result in a higher group delay peak and achieve a superior phase noise performance. Based on the proposed SICL resonator, an X-band oscillator has been designed and demonstrated by using low-cost printed circuit boards (PCBs). Great consistency between the measured and simulated results is verified. According to the measured results, the oscillation frequency of the SICL oscillator is 10.0625 GHz with −1.81 dBm RF output power, and the phase noise is −138.6 dBc/Hz@1 MHz. The statistic figure of merit (FOM) is −206.1 dBc/Hz@1 MHz.

Wide Stopband Bandpass Filter Implemented With Spur Stepped Impedance Resonator and Substrate Integrated Coaxial Line Technology

A novel wide stopband bandpass filter implemented with spur stepped impedance resonator (SSIR) and substrate integrated coaxial line (SICL) technology is proposed in this letter. SSIR possesses capabilities of both suppressing and staggering spurs without complicated fine-tuning, and SICL is very suitable for wide stopband applications. A prototype with compact size is fabricated, and the measured results exhibit extended stopband up to 8.76 f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> with a rejection better than 40 dB (except for a little 36.5 dB burr in 7.06 f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ), or 9.36 f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> with rejection better than 30 dB.

A compact substrate integrated coaxial line bandpass filter with extended rejection bandwidth

ABSTRACTIn this article, a compact bandpass filter is proposed using substrate integrated coaxial line technology. An extended rejection bandwidth performance is achieved by introducing partially coupled λ/4‐stepped impedance resonators. Based on the multilayer PCB process, a prototype has been fabricated in a 5.8 × 20 × 1.13 mm3 planar module, which is about 0.045 λ0 × 0.16 λ0 × 0.009 λ0. Measurements confirm that the proposed filter centered at 2.35 GHz is realized with a very low insertion loss of 0.96 dB, and a 27‐dB rejection bandwidth up to 5.82f0. The filter features compact size, low crosstalk, low loss, and high density integration ability. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:415–418, 2014

Ultra-Wideband Single and Dual Baluns Based on Substrate Integrated Coaxial Line Technology

In this paper, ultra-wideband (UWB) Marchand baluns using substrate integrated coaxial line (SICL) technology are first proposed. SICL is a shielded planar coaxial line, which is very suitable for wideband and high-speed applications due to its broad unimodal operation band, low insertion loss, very small dispersion, and easy integration with other planar circuits. In order to achieve wider bandwidth and better VSWR performance of the SICL balun, a pair of quarter-wave impedance transformers are inserted into the balanced line. The impedance characteristics of the proposed SICL baluns are analyzed, and the parameters that determine the balun bandwidth are discussed. Then, curves of the balun resistance, reactance, and the SICL characteristic impedance are presented. According to these curves, the design parameters of the proposed SICL baluns can easily be determined. To verify these ideas, an UWB SICL single balun and an UWB SICL dual balun are designed, fabricated, and measured. Both full-wave simulated and measured results are presented, and good agreement between them is observed. The proposed SICL baluns have a simple structure and good performance, which are suitable for applications in UWB communication systems.

Coaxial/cylindrical transition line for broadband permittivity measurement of civil engineering materials

A one-port coaxial/cylindrical transition line is considered for the broadband complex permittivity measurement of civil engineering materials. Cylindrical samples of heterogeneous material with large aggregate dimensions (up to 25 mm) can be measured over a frequency range from 50 MHz to 1.6 GHz. The choice of this line technology results in the simplification of the sample machining and enhancement in the high frequency limit, in comparison to the classical coaxial line technology. From a mode-matching technique, the relation between the material complex permittivity and the reflection coefficient at the coaxial/cylindrical transition is obtained including axisymmetric higher order modes excited at the transition. Once the line is calibrated using a specific calibration kit, complex permittivities are retrieved from an iterative optimization procedure. Preliminary results obtained for a set of bituminous concrete samples with different porosities and natures of rock aggregates are shown.