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Dispersive Delay Lines Using Microstrip Technology
The Journal of Engineering
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... The DDL has all-pass magnitude response over ultra-wideband frequency range and provides a smooth and continuous group delay profile. In [11], the DDL theories of microstrip line technology are further developed, and analytical expressions that contain the transmission coefficient (|S 21 |) and group delay (GD) are derived. In [12], two deformed open stubs and their complementary slot lines are used to obtain a DDL with all-pass magnitude respond and good group delay. ...
... In [12], two deformed open stubs and their complementary slot lines are used to obtain a DDL with all-pass magnitude respond and good group delay. Although there are some distinguished advantages in [10][11][12] for the DDL using microstrip line technology, the miniaturization of the DDL is crucial to the practical application, especially for operating in the low frequency band. However, both the open stubs and their complementary short slot lines in [10][11][12] are about a half guide wavelength (λ g /2) and located on both sides of the main transmission line symmetrically, which occupy a relative large space accordingly. ...
... Although there are some distinguished advantages in [10][11][12] for the DDL using microstrip line technology, the miniaturization of the DDL is crucial to the practical application, especially for operating in the low frequency band. However, both the open stubs and their complementary short slot lines in [10][11][12] are about a half guide wavelength (λ g /2) and located on both sides of the main transmission line symmetrically, which occupy a relative large space accordingly. ...
This letter proposes a large group delay microstrip circuit using a quarter wavelength symmetric coupled open stub (SCOS) and collocated double slot at 2.4 GHz. A design approach based on matching the quality factor (
$Q$
) of SCOSs and slot loaded line is proposed to arrive at the physical parameters of these resonators. It has been shown that coupled lines with collocated double ground slots have significantly higher group delay compared to the geometry with single open stub and slot in the ground. Electromagnetic susceptibility (EMS) of circuit has been analyzed using simulations. A design with peak group delay (PGD) value of more than 4.3 ns is fabricated and characterized to validate the design approach. In addition to the large PGD the realized circuit possesses wideband impedance matching characteristics similar to an all-pass network.
A novel wideband microstrip band-pass filter is presented in this letter based on a quadruple-mode ring resonator, which is developed by introducing a stepped-impedance one-wavelength ring resonator (SORR) into a stepped-impedance half-wavelength resonator (SHR). In order to suppress the harmonic responses of the filter for a wide stop-band, two band-stop sections with asymmetrical -type structure are introduced. A prototype filter having 49.3% of 1 dB and 57.9% of 3 dB fractional bandwidth is fabricated with advantages of high selectivity and high out-of-band rejection. In the pass-band, the return loss is larger than 18.8 dB and at the centre frequency insertion loss is 0.6 dB. The experiments are in good agreement with the simulations.
A novel compact-size branch-line coupler using composite right/left-handed transmission lines is proposed in this paper. In order to obtain miniaturization, composite right/left-handed transmission lines with novel complementary split single ring resonators which are realized by loading a pair of meander-shaped-slots in the split of the ring are designed. Th s novel coupler occupies only 22.8% of the area of the conventional approach at 0.7 GHz. The proposed coupler can be implemented by using the standard printed-circuit-board etching processes without any implementation of lumped elements and via-holes, making it very useful for wireless communication systems. The agreement between measured and stimulated results validates the feasible configuration of the proposed coupler.
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A hybrid‐cascade (HC) coupled‐line phaser configuration is presented to synthesize enhanced group delay responses for high‐resolution radio‐analog signal processing. Using exact analytical transfer functions, the superiority of HC coupled‐line phasers over conventional transversally cascaded C‐section phasers is demonstrated and verified using full‐wave simulations. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2502–2504, 2014
A microstrip shunt open-stub overlapping a shorted slotline is presented and used to design a novel wideband dispersive delay line. The inherent periodic transmission zeros due to the resonances of an open-stub and a shorted slotline can be removed by using the complementary configuration. Moreover, the phase response of the complementary stub is frequency dependant which is used to design a dispersive delay line. The group delay profile of the complementary stub is smooth and continuous while at the same time maintaining a flat magnitude response over an ultra-wide bandwidth. Several units can be cascaded to obtain a desired group delay profile. This configuration can be used in analog signal processing or to reduce the signal distortion from other wideband components.
For the first time, a systematic synthesis method for cross-coupled dispersive delay structures (DDSs) with controlled magnitude for analog signal processing applications is proposed. In this method, the transfer function is synthesized using a polynomial expansion approach, which allows to separately control the magnitude and group-delay response of the DDS. The synthesized transfer function also features a reduced order-namely, half-compared to that of previously reported synthesis techniques for linear-phase filters. Once it has been constructed, the transfer function is transferred into coupling matrices that can be implemented in arbitrary cross-coupled-resonator technologies. Several design examples are provided for different prescribed group-delay responses. An experimental waveguide prototype is demonstrated. The agreement between the measured and prescribed responses illustrates the proposed synthesis method.
An exact closed-form synthesis method is proposed for the design of narrowband reflection-type (mono-port) phasers with arbitrary prescribed group-delay responses. The proposed synthesis technique consists in three steps. First, it transforms the phase problem from the bandpass domain to the low-pass domain using a one-port ladder network, where a mathematical synthesis is performed via a Hurwitz polynomial. Second, it transforms the synthesized low-pass network back to the bandpass domain for implementation in a specific technology. Third, it uses an iterative post-distortion correction technique to compensate for distributed effects over the broader bandwidth required. The proposed synthesis method is verified by both full-wave analysis and experiment where the synthesized bandpass network is realized in an iris-coupled waveguide configuration.