The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform

Shyh-jong Chung - One of the best experts on this subject based on the ideXlab platform.

  • A Compact Printed Filtering Antenna Using a Ground-Intruded Coupled Line Resonator
    2016
    Co-Authors: Chaotang Chuang, Shyh-jong Chung, Senior Member
    Abstract:

    Abstract—A compact printed Filtering antenna with high band-edge gain selectivity is presented. Occupying about the same sub-strate area as a conventional antenna, the proposed structure not only serves as a radiator but also a second-Order Bandpass Filter, with one Filter pole provided by a -shaped antenna and the other by a newly proposed coupled line resonator. High band-edge se-lectivity is achieved due to two additional stop-band transmission zeros provided by the coupled line resonator. To minimize the re-quired area and reduce the spurious radiation, a coupled line struc-ture composed of a microstrip line and a coplanar waveguide by broadside coupling is adopted and intruded into the -shaped an-tenna area. According to the Filter specifications, a design proce-dure for the proposed Filtering antenna is depicted in detail. One example at 2.45 GHz with a second-Order Chebyshev Bandpass Filter of 0.1 dB equal-ripple response is tackled. As compared to the conventional-shaped antenna, the proposed Filtering antenna not only possesses a similar antenna gain but also provides better band-edge gain selectivity and flat passband gain response. The mea-sured results, including the S-parameters, total radiated power, and antenna gains versus frequency, have good agreement with the designed ones. Index Terms—Band-edge selectivity, Bandpass Filter, coupled line resonator, Filtering antenna. I

  • a compact printed Filtering antenna using a ground intruded coupled line resonator
    IEEE Transactions on Antennas and Propagation, 2011
    Co-Authors: Chaotang Chuang, Shyh-jong Chung
    Abstract:

    A compact printed Filtering antenna with high band-edge gain selectivity is presented. Occupying about the same substrate area as a conventional antenna, the proposed structure not only serves as a radiator but also a second-Order Bandpass Filter, with one Filter pole provided by a Γ-shaped antenna and the other by a newly proposed coupled line resonator. High band-edge selectivity is achieved due to two additional stop-band transmission zeros provided by the coupled line resonator. To minimize the required area and reduce the spurious radiation, a coupled line structure composed of a microstrip line and a coplanar waveguide by broadside coupling is adopted and intruded into the Γ-shaped antenna area. According to the Filter specifications, a design procedure for the proposed Filtering antenna is depicted in detail. One example at 2.45 GHz with a second-Order Chebyshev Bandpass Filter of 0.1 dB equal-ripple response is tackled. As compared to the conventional Γ -shaped antenna, the proposed Filtering antenna not only possesses a similar antenna gain but also provides better band-edge gain selectivity and flat passband gain response. The measured results, including the S-parameters, total radiated power, and antenna gains versus frequency, have good agreement with the designed ones.

  • A Filtering Microstrip Antenna Array
    IEEE Transactions on Microwave Theory and Techniques, 2011
    Co-Authors: Chin-kai Lin, Shyh-jong Chung
    Abstract:

    A new Filtering microstrip antenna array is presented. The antenna elements, together with the very compact feeding network, function as a third-Order Bandpass Filter. The feeding network, which consists of one power divider and two baluns, provides the first two stages, and the microstrip antenna elements provide the last stage in the Filter design. The equivalent lumped circuit model is analyzed, and the detail synthesis procedure is presented. A third-Order Filtering 2 × 2 microstrip antenna array is designed at a center frequency of 5 GHz with 3% fractional bandwidth and Chebyshev 0.3-dB equal-ripple broadside antenna gain response. The results from circuit model, full-wave simulation, and measurements agree well. Compared to the conventional patch antenna array, the proposed Filtering microstrip antenna array successfully suppresses the unwanted signals in out-of-band, preserves good selectivity at band edges, and retains the flatness of the passband broadside antenna gain response.

  • Bandpass Filter of serial configuration with two finite transmission zeros using ltcc technology
    IEEE Transactions on Microwave Theory and Techniques, 2005
    Co-Authors: Chunfu Chang, Shyh-jong Chung
    Abstract:

    This study proposes a second-Order Bandpass Filter of serial configuration. The Filter schema incorporates a grounding capacitor, connecting the two conventional parallel LC resonators with the ground, to provide two finite transmission zeros. The impedance matrix and graphical solutions describe proposed Filter's operation principle. To demonstrate the proposed Filter schema, two Bandpass Filters, with center frequencies of 2.44 and 4.8 GHz, were designed and implemented using low-temperature co-fired ceramic multilayer technology. The measured results were found to agree well with the simulation results. The 2.44-GHz fabricated Bandpass Filter was found to possess low in-band insertion loss and high out-band suppression, making it suitable in wireless local area networks, Bluetooth, and RF home links.

Taejoon Park - One of the best experts on this subject based on the ideXlab platform.

  • compact uhf 9th Order Bandpass Filter with sharp skirt by cascaded triplet crlh zor
    Journal of Electrical Engineering & Technology, 2013
    Co-Authors: Sungtek Kahng, Boram Lee, Taejoon Park
    Abstract:

    We propose a compact high-Order(9th) UHF Bandpass Filter comprising the composite right-handed and left-handed(CRLH) zeroth-Order resonators(ZORs) in the form of the three cascadedtriplets(CTs) newly applied to the ZOR Filter which results in very steep skirt. The method is verified by circuit and EM simulations and measurement with metamaterial properties.

  • compact uhf 9th Order Bandpass Filter with sharp skirt by cascaded triplet crlh zor
    Journal of Electromagnetic Waves and Applications, 2012
    Co-Authors: Sungtek Kahng, Boram Lee, Taejoon Park
    Abstract:

    Abstract We propose a novel Bandpass Filter miniaturized by the composite right- and left-handed (CRLH) zeroth Order resonators (ZORs) which form a cascaded triplet (CT) to have a significantly sharp skirt for high frequency selectivity. A 3rd-Order UHF Bandpass case is tested. Therefore, firstly, we design an in-line ZOR Bandpass Filter whose total size is nearly 0.3 times the size of the paralleledge coupled Filter. Secondly, we create a transmission zero (TZ) by changing the three in-line ZORs of the Filter to a CT. As a result, with the insertion loss less than 1.1 dB and return loss less than −15 dB, the proposed Filter has the size-reduction so that its size is smaller than 1/3 of a 3rd-Order parallel-edge coupled Filter, and its skirt is as steep as a 6th-Order Chebyshev Filter. The simulation and measurement validate the proposed design method, and the CRLH ZOR properties are proven by the no-phase variation electric field and dispersion diagram.

Kwangjin Koh - One of the best experts on this subject based on the ideXlab platform.

  • integrated synthetic fourth Order q enhanced Bandpass Filter with high dynamic range tunable frequency and fractional bandwidth control
    IEEE Journal of Solid-state Circuits, 2019
    Co-Authors: Farooq Amin, Sanjay Raman, Kwangjin Koh
    Abstract:

    This paper demonstrates a tunable synthetic fourth-Order Bandpass Filter (BPF) at microwave frequencies. Two parallel second-Order Q-enhanced LC BPFs responses are added with the out of phase to synthesize a fourth-Order BPF response. The Filter is implemented in a 130-nm SiGe BiCMOS technology with a core die area of $0.53 \times 0.7$ mm2. The Filter center frequency can be tuned from 4 to 8 GHz (C-band). The Filter also achieves a wide 3-dB fractional bandwidth (BW) tuning range of 2%–25%, with a passband ripple of less than 0.5 dB. The corresponding normalized dynamic range (DR) is 151–166 $\text {dB}\cdot \text {Hz}$ owing to a switched varactor control scheme to realize a large effective tuning range with high linearity. Using the parallel synthesis approach, the Filter can maintain the DR of a second-Order BPF while achieving a fourth-Order frequency selectivity, which is favorable compared to cascading resonators. On the lower side of the band, the Filter achieves more than 65 dB of ultimate rejection. On the upper side, the rejection is more than 52 dB. The Filter also employs a variable transconductor for noise-linearity tradeoff flexibility. The power consumption of the Filter is 112–125 mW over the above fractional BW tuning range at the target C-band.

Sungtek Kahng - One of the best experts on this subject based on the ideXlab platform.

  • compact uhf 9th Order Bandpass Filter with sharp skirt by cascaded triplet crlh zor
    Journal of Electrical Engineering & Technology, 2013
    Co-Authors: Sungtek Kahng, Boram Lee, Taejoon Park
    Abstract:

    We propose a compact high-Order(9th) UHF Bandpass Filter comprising the composite right-handed and left-handed(CRLH) zeroth-Order resonators(ZORs) in the form of the three cascadedtriplets(CTs) newly applied to the ZOR Filter which results in very steep skirt. The method is verified by circuit and EM simulations and measurement with metamaterial properties.

  • compact uhf 9th Order Bandpass Filter with sharp skirt by cascaded triplet crlh zor
    Journal of Electromagnetic Waves and Applications, 2012
    Co-Authors: Sungtek Kahng, Boram Lee, Taejoon Park
    Abstract:

    Abstract We propose a novel Bandpass Filter miniaturized by the composite right- and left-handed (CRLH) zeroth Order resonators (ZORs) which form a cascaded triplet (CT) to have a significantly sharp skirt for high frequency selectivity. A 3rd-Order UHF Bandpass case is tested. Therefore, firstly, we design an in-line ZOR Bandpass Filter whose total size is nearly 0.3 times the size of the paralleledge coupled Filter. Secondly, we create a transmission zero (TZ) by changing the three in-line ZORs of the Filter to a CT. As a result, with the insertion loss less than 1.1 dB and return loss less than −15 dB, the proposed Filter has the size-reduction so that its size is smaller than 1/3 of a 3rd-Order parallel-edge coupled Filter, and its skirt is as steep as a 6th-Order Chebyshev Filter. The simulation and measurement validate the proposed design method, and the CRLH ZOR properties are proven by the no-phase variation electric field and dispersion diagram.

A V Boriskin - One of the best experts on this subject based on the ideXlab platform.

  • microfluidically tunable microstrip Filters
    IEEE Transactions on Microwave Theory and Techniques, 2015
    Co-Authors: D L Diedhiou, Ronan Sauleau, A V Boriskin
    Abstract:

    A new approach for the development of tunable and reconfigurable microstrip (MS) devices is proposed. The basic idea consists of using a suspended substrate with an integrated network of plastic tubes, which can be selectively filled in with a high-permittivity dielectric fluid, e.g., water. The local change of the substrate effective permittivity achieved in such a way enables one to change, in a controlled and reversible manner, the electrical length of certain elements of MS circuits. As a proof-of-concept, tunable stub resonators based on suspended and inverted MS lines are designed and characterized in frequency and time domains. The same principle is then applied for the development of a fourth-Order Bandpass Filter with 40% fractional bandwidth operating at 5 GHz. A tunable range of 19.5% with the insertion loss of 0.6 dB is demonstrated. The performance of the stub resonators and Filter is validated successfully via prototyping.