Abstract:A design of a compact coplanar strip (CPS)-to-microstrip line (MSL) transition using a bended structure on a two-layered substrate is presented. The proposed transition consists of a CPS taper and a bended CPS-to-MSL transition on a two-layered substrate. The CPS taper is formed on the lower substrate with low permittivity (εr = 3.38), and the bended CPS-to-MSL transition is formed on the upper substrate with high permittivity (εr= 10.2). The proposed transition is designed with analytical formulas obtained by… Show more
“…A compact single/multi-band coupled-multiline filtering unit has been proposed to design RF filtering devices 21 . The compact size and multiple operational bands and order make CPS technology an attractive alternative for circuit design in appliances such as mixers, antennas 22,23,24 , and filters 25 .…”
This paper has designed a bandpass filter using a coplanar stripline
stub (CPS) resonator consisting of open and short-ended strip lines
connected to the PIN Diode switches. The use of spurline stub resonators
inside CPS results in bandpass and bandstop filters, depending on the
PIN diode switch configurations. The work presents a novel circuit
architecture aimed at reducing parasitic resonance of the spurline
resonators and acquire the necessary series stub characteristics. The
proposed filter resonates at 6.9-9 GHz and 1.7-4.7 GHz, and 8.4 GHz when
the PIN diodes are forward and reverse-biased, respectively. It also
resonates at 1-2.1 GHz, 4.8-5.3 GHz, and 6.9-9 GHz when one diode is
reverse-biased, and the other is connected in forward bias. An insertion
loss below -0.55 dB and a return loss less than 10dB have been obtained
during simulation and measurement. The designed filter can find
different applications for the 1.8 GHz GSM band, 2.4/5.8GHz (WLAN), 3.6
GHz (WiMAX), Long Term Evolution (LTE), and WIFI. The filter can be used
in various multi-frequency systems owing to its compact size. The
measured and simulated findings of the proposed CPS spurline stub
resonator wideband bandpass filters are substantially consistent.
“…A compact single/multi-band coupled-multiline filtering unit has been proposed to design RF filtering devices 21 . The compact size and multiple operational bands and order make CPS technology an attractive alternative for circuit design in appliances such as mixers, antennas 22,23,24 , and filters 25 .…”
This paper has designed a bandpass filter using a coplanar stripline
stub (CPS) resonator consisting of open and short-ended strip lines
connected to the PIN Diode switches. The use of spurline stub resonators
inside CPS results in bandpass and bandstop filters, depending on the
PIN diode switch configurations. The work presents a novel circuit
architecture aimed at reducing parasitic resonance of the spurline
resonators and acquire the necessary series stub characteristics. The
proposed filter resonates at 6.9-9 GHz and 1.7-4.7 GHz, and 8.4 GHz when
the PIN diodes are forward and reverse-biased, respectively. It also
resonates at 1-2.1 GHz, 4.8-5.3 GHz, and 6.9-9 GHz when one diode is
reverse-biased, and the other is connected in forward bias. An insertion
loss below -0.55 dB and a return loss less than 10dB have been obtained
during simulation and measurement. The designed filter can find
different applications for the 1.8 GHz GSM band, 2.4/5.8GHz (WLAN), 3.6
GHz (WiMAX), Long Term Evolution (LTE), and WIFI. The filter can be used
in various multi-frequency systems owing to its compact size. The
measured and simulated findings of the proposed CPS spurline stub
resonator wideband bandpass filters are substantially consistent.
A design of a modular antenna/detector array for the electron cyclotron emission (ECE) imaging system at the Korea Superconducting Tokamak Advanced Research (KSTAR) is proposed. The modular antenna/detector array is based on a unit antenna/detector module, which consists of an elliptical mini-lens, a dual-dipole antenna, an antenna balun, a low-noise amplifier, and a metal frame. The proposed modular antenna/detector array resolves the problem in the conventional antenna/detector array where one faulty channel requires the entire array to be removed for the service. With the proposed modular array, each channel module can be easily and independently removed and replaced without interference to the rest of the array, thus minimizing the interrupted service time for maintenance. Moreover, the unit channel modules can be efficiently updated under a variety of the tokamak operation conditions. The antenna/detector modules are optimized to have improved performance, and are tested in a W-band test setup, and consistently provide the gain increase by 10~20 dB as compared with the conventional antenna/detector array. A set of the proposed modular antenna/detector array is currently installed and tested in the KSTAR ECE imaging system, and will consistently produce the improved ECE imaging to monitor MHD instability activities under various plasma operation conditions.
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