Lin, JY, Wong, SW, Zhu, L, Yang, Y, Zhu, X, Xie, ZM & He, Y 2018, 'A Dual-Functional Triple-Mode Cavity Resonator with the Integration of Filters and Antennas', IEEE Transactions on Antennas and Propagation, vol. 66, no. 5, pp. 2589-2593.View/Download from: Publisher's site
© 1963-2012 IEEE. A novel concept for the two-in-one design with the integration of filters and antennas, using a single cavity, is presented in this communication. Basically, a triple-mode resonator (TMR) is utilized as a common feeder to achieve filtering and radiating functions at three different frequency bands. Each of the three bands adopts one of the three fundamental modes, namely, TE011, TE101, and TM110, in a single TMR to realize the relevant functions. Owing to the modal orthogonality of these fundamental modes, high isolation can be effectively realized among these three channels. Based on the proposed TMR, three different prototypes are designed for different applications. For the first prototype, the structure of a dual-band filter plus an antenna is presented using a second-order TMR. Based on the combination of a duplexer plus an antenna, the second prototype is attained. To further explore the function of the proposed TMR, the structure of a filter plus a dual-polarization antenna is depicted as the third prototype. For verification, the third prototype is fabricated and tested. Good agreement between the simulated and the measured results is achieved, which proves the feasibility of the proposed design methodology.
Zhou, S, Lin, J-Y, Wong, S-W, Deng, F, Zhu, L, Yang, Y, He, Y & Tu, Z-H 2018, 'Spoof Surface Plasmon Polaritons Power Divider with large Isolation.', Scientific reports, vol. 8, no. 1.View/Download from: UTS OPUS or Publisher's site
Periodic corrugated metal structure is designed to support and propagate spoof surface plasmon polaritons (SSPPs) wave in the microwave frequencies. In this paper, firstly a plasmonic waveguide consisting of oval-ring shaped cells is proposed with the performance of high transmission efficiency in a wide frequency range. The coplanar waveguides (CPWs) with 50 Ω impedance are adopted to feed the energies or extract signals at both ends of the plasmonic waveguide. Then a well-isolated power divider is constructed based on the SSPPs waveguides aiming to equally split the energy of the SSPPs wave into two equal parts. The stepped-impedances are co-designed with the three input/output ports of the power divider to achieve the impedance-matching between the SSPPs waveguides and the coplanar waveguides. Besides, a single resistor is placed in the middle of two symmetrical half oval-rings to realize the isolation between the two output ports over the spectrum of 4.5-7.5 GHz. Finally, both plasmonic waveguide and the power divider are fabricated and tested to verify the predicted characteristics.
Wong, SW, Zheng, BL, Lin, JY, Zhang, ZC, Yang, Y, Zhu, L & He, Y 2018, 'Design of Three-State Diplexer Using a Planar Triple-Mode Resonator', IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 9, pp. 4040-4046.View/Download from: UTS OPUS or Publisher's site
© 1963-2012 IEEE. A highly integrated three-state diplexer (TSD) on a single planar elliptical structure is for the first time presented in this paper. Three resonant modes are investigated in a planar elliptical resonator, e.g., two TM11 degenerate modes and one TM21 mode. These three resonant modes are designed to form three filtering channels, which are further combined to generate three states of a diplexer, namely, TSD. The planar elliptical triple-mode resonator is fed by three microstrip lines to form a triple-mode TSD. In order to validate the concept, the designed planar TSD is fabricated and measured. The measured results are in good agreement with the simulated ones.
Lin, JY, Wong, SW, Wu, YM, Zhu, L, Yang, Y & He, Y 2018, 'A New Concept and Approach for Integration of Three-State Cavity Diplexer Based on Triple-Mode Resonators', IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 12, pp. 5272-5279.View/Download from: Publisher's site
© 2018 IEEE. A novel concept and approach for integration of a three-state diplexer (TSD) by utilizing the triple-mode cavity resonators is proposed in this paper. The proposed TSD has the inherent nature of three frequency channels, two of which can be utilized for duplexing channels by exciting one port as the input in each state. Meanwhile, three fundamental modes, namely, TE 011 , TE 101 , and TM 110 , are excited in the triple-mode resonators (TMRs) to control these three frequency channels. Without utilizing any junction networks for impedance matching, the required values of the external quality factors and coupling coefficients can be extracted to meet the relevant Chebyshev responses in the three bands of the TSD, simultaneously. Owing to the modal orthogonality among the three fundamental modes, high isolation among these three frequency channels can be effectively achieved. For proof of concept, two design examples of the TSD structures are presented with different topologies. For both examples, four and six TMRs are adopted, respectively, where the predicted three frequency channels of the TSD can be successfully excited with excellent channel isolations. The fabricated prototype shows good agreement between the simulated and measured results verifying the feasibility of the proposed design methodology.
Wong, SW, Deng, F, Wu, YM, Lin, JY, Zhu, L, Chu, QX & Yang, Y 2017, 'Individually Frequency Tunable Dual- and Triple-band Filters in a Single Cavity', IEEE Access, vol. 5, pp. 11615-11625.View/Download from: UTS OPUS or Publisher's site
© 2013 IEEE. This paper presents a new class of second-order individually and continuously tunable dual- and triple-band bandpass filters in a single metal cavity. Each passband is realized by two identical metal posts. These dual- and triple-band tunable filters are achieved by putting two or three identical sets of metal-post pair in a single metal cavity. Metal screws are co-designed as a part of the metal posts to control their insertion depth inside the cavity. In this way, the resonant frequencies can be continuously controlled and designed at the desired frequency bands. Moreover, the distance between the two metal posts in a post pair can be freely tuned. Thus, the external quality factor (Q e ) and coupling coefficient (k) between the adjacent modes can be easily adjusted to meet the specified requirement in synthesis design. At the bottom of the cavity, some grooves are used to extend the tunable frequency range and make the resonant frequency linearly varied with the height of the metal post. The center frequency of each passband can be independently tuned with a frequency range of 0.8-3.2 GHz and tunable ratio of 4. Finally, the continuously tunable dual- and triple-band bandpass filters prototypes with second order response are designed and fabricated, of which each passband can be individually tuned with a large tuning range.
Guo, ZC, Wong, SW, Lin, JY, Zhu, L, Chu, QX, Zhang, Q & Yang, Y 2017, 'Triple-Mode Cavity Bandpass Filter on Doublet with Controllable Transmission Zeros', IEEE Access, vol. 5, pp. 6969-6977.View/Download from: UTS OPUS or Publisher's site
© 2013 IEEE. On the basis of doublet and its properties, a class of multiple-mode narrow band bandpasss filter is designed and fabricated by simultaneously exploiting the three resonant modes in a single rectangular cavity: TE 101 , TE 011 , and TM 110 modes. The input/output ports of the proposed filter are fed by coupling a microstrip line to a slot on the side wall of a rectangular cavity. Different modes are excited by changing the position and shape of the two slots at input and output of the rectangular cavity without any intra-cavity coupling. Besides three poles within the passband, a pair of transmission zeros (TZs) is achieved, which can be controlled independently by setting the positions of the two TZs at the lower and/or upper stopband. High stopband attenuation and high filtering selectivity are achieved by considerably allocating three transmission poles and two zeros. In order to verify the proposed theory, two filter prototypes are fabricated and measured.
Cai, Z, Lin, J, Zhang, T, Yang, Y, Liu, Y & Tang, X 2018, 'A low phase noise VCO employing tunable stubs loaded nested split-ring resonator', 2018 Australian Microwave Symposium, AMS 2018 - Conference Proceedings, Australian Microwave Symposium, IEEE, Brisbane, QLD, Australia, pp. 57-58.View/Download from: UTS OPUS or Publisher's site
© 2018 IEEE. In this paper, a low phase noise VCO employing tunable stubs loaded nested split-ring resonator (SLNSRR) has been proposed By loading anti-pair varactors at each side of the SLNSRR, the center frequency of the SLNSRR filter can be tuned from 1.82 GHz to 2.18 GHz. In the oscillator design, the tunable SLNSRR filter is used as a frequency stable element to select the oscillation frequency while keeping the low phase noise performance. To validate the method, an L-band to S-band VCO is designed, fabricated and measured. The measured results show that the proposed VCO has a frequency tuning range from 1.787 GHz to 2.117 GHz with a 16.9 % bandwidth. Over this frequency range, the phase noises measured at 1 MHz frequency offset are better than -113.49 dBc/Hz.
Zhang, T, Lin, J, Bao, J, Cai, Z & Yang, Y 2018, 'Design of voltage-controlled oscillator with compact size and wide tuning range', 2018 Australian Microwave Symposium, AMS 2018 - Conference Proceedings, Australian Microwave Symposium, Brisbane, QLD, Australia, pp. 59-60.View/Download from: UTS OPUS or Publisher's site
© 2018 IEEE. In this paper, a novel frequency-tunable filter based low noise voltage-controlled oscillator (VCO) is proposed. The proposed tunable filter consists of a T-type resonator with four varactors and a pair of short-ended stubs connected with feedlines. High-Q can be achieved by introducing a transmission zero on the upper stopband, which can reduce the phase noise of the VCO. The whole size of the tunable filter is 0.002λ2g. The proposed VCO was fabricated and measured indicating a promising frequency-tuning range from 2.2 to 3.2 GHz with the second harmonic suppression level of better than 22 dB. The measured phase noise is -88-91.44dBc/Hz at 100KHz offset.
Lin, JY, Li, MZ, Wong, SW, Yang, Y & Zhu, X 2018, 'A cavity triple-mode filter with excitation of L-shape model', 2018 Australian Microwave Symposium, AMS 2018 - Conference Proceedings, Australian Microwave Symposium, IEEE, Brisbane, Australia, pp. 17-18.View/Download from: UTS OPUS or Publisher's site
© 2018 IEEE. A triple-mode cavity filter with narrow passband realized in a single rectangular metal cavity without any tune crews, coupling apertures, iris, and corner cuts is proposed in this paper, while three resonant modes are classified as a TM mode and a pair of TE modes, which are excited by two metal probes in one single cavity. At both the upper and lower stop-bands, two transmission zeros are created to achieve a considerable out-of-band suppression. To prove the concept, a prototype is fabricated by using the silver plated aluminum technology demonstrating a measured fractional bandwidth of 3.6% at the center frequency of 2.53 GHz. The measured and simulated results are presented in good agreement.
Lil, M, Lin, JY, Yang, Y, Zhu, X & Wong, SW 2018, 'A New Approach of Individually Control of Shorting Posts for Pattern Reconfigurable Antenna Designs', 2018 IEEE International Conference on Computational Electromagnetics, ICCEM 2018, International Conference on Computational Electromagnetics, IEEE, Chengdu, China.View/Download from: UTS OPUS or Publisher's site
© 2018 IEEE. This paper presents a recently proposed novel approach for pattern reconfigurable antenna designs. Individually associating a shorting post with an RF switch, the shorting post can be simply connected to the ground by turning the switch on or disconnected to the ground by turning the switch off. This approach has been successfully validated through two recently reported designs, for the implementations of transverse magnetic TM mode reconfiguration and 360° beam-steering.