scholarly journals A 60 GHz Planar Diplexer Based on Substrate Integrated Waveguide Technology

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Nikolaos Athanasopoulos ◽  
Dimitrios Makris ◽  
Konstantinos Voudouris
Keyword(s):  
Millimeter Wave ◽  
Electromagnetic Simulation ◽  
Substrate Integrated Waveguide ◽  
60 Ghz ◽  
High Isolation ◽  
Wireless Backhaul ◽  
Front End ◽  
Point To Point ◽  
Insertion Losses ◽  
Good Agreement

This paper presents a millimeter-wave, 60 GHz frequency band planar diplexer based on substrate integrated waveguide (SIW) technology. Diplexer consists of a pair of 5th-order SIW bandpass channel filters with center frequencies at 59.8 GHz and 62.2 GHz providing 1.67% and 1.6% relative bandwidths, respectively. SIW-to-microstrip transitions at diplexer ports enable integration in a millimeter-wave transceiver front end. Measurements are in good agreement with electromagnetic simulation, reporting very good channel isolation, small return losses, and moderate insertion losses in the passbands. The proposed SIW planar diplexer is integrated into a millimeter-wave transceiver front end for 60 GHz point-to-point multigigabit wireless backhaul applications, providing high isolation between transmit and receive channels.

Design of multi-layered bandpass filter with independently controllable triple-passband response

2014 ◽  
Vol 6 (6) ◽  
pp. 611-618 ◽  
Author(s):  
Yung-Wei Chen ◽  
Hung-Wei Wu ◽  
Yan-Kuin Su
Keyword(s):  
Frequency Response ◽  
Bandpass Filter ◽  
Bottom Layer ◽  
Wide Frequency Range ◽  
Electromagnetic Simulation ◽  
Frequency Range ◽  
High Isolation ◽  
Full Wave ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new multi-layered triple-passband bandpass filter using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4, and 3.5 GHz. The 1st and 2nd passbands (1.8/2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). Using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes. Therefore, the design of multi-band filters with very close passbands can be easily achieved and having a high isolation between the passbands. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The measured results are in good agreement with the full-wave electromagnetic simulation results.

scholarly journals Wideband Directional Coupler for Millimeter Wave Application based on Substrate Integrated Waveguide

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohammad Javad Tavakoli ◽  
Ali Reza Mallahzadeh
Keyword(s):  
Numerical Methods ◽  
Millimeter Wave ◽  
Directional Coupler ◽  
Return Loss ◽  
Wide Band ◽  
Substrate Integrated Waveguide ◽  
Fractional Bandwidth ◽  
High Isolation ◽  
Microwave Applications ◽  
Hole Structure

Recently, Substrate Integrated Waveguide (SIW) techniques have been noticed for millimeter wave devices in microwave applications. In this paper, we are developing a wide band directional 3 dB coupler with a phase of 90̊ phase delay in the range of 30-40 GHz based on periodic vias and multi hole structure. For achieving this wide bandwidth multi-section coupler is designed based on the theoretical modeling and the simulation result is compared with HFSS and CST with  two different  numerical  methods show good performance with low insertion and return loss, broad operational bandwidth and high isolation. A fractional bandwidth is about 28.5 %.

scholarly journals SPDT discrete switch design using switchable SIW resonators for millimeter wave MIMO transceiver

2021 ◽  
Vol 24 (3) ◽  
pp. 1542
Author(s):  
Amirul Aizat Zolkefli ◽  
Badrul Hisham Ahmad ◽  
Noor Azwan Shairi ◽  
Adib Othman ◽  
Zahriladha Zakaria ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Millimeter Wave ◽  
Multiple Input Multiple Output ◽  
Substrate Integrated Waveguide ◽  
Rf Power ◽  
High Isolation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Switch Design ◽  
Power Leakage

A single pole double throw (SPDT) discrete switch design using switchable substrate integrated waveguide (SIW) resonators is proposed in this paper. It was designed for the millimeter wave multiple input multiple output (MIMO) transceiver. An example application is for 5G communication in 26 GHz band. High isolation between transmitter and receiver (in the transceiver) is needed in SPDT switch design to minimize any high radio frequency (RF) power leakage in the receiver. Therefore, the use of switchable SIW resonators can achieve higher isolation if compared to the conventional series SPDT switch, where the isolation of the proposed SPDT is depend on the bandstop response of the SIW resonators. The switchable SIW resonators can be switched between allpass and bandstop responses to allow the operation between transmit and receive modes. As a result, the simulation and measurement showed that the proposed SPDT switch produced an isolation higher than 25 dB from 24.25 to 27.5 GHz compared to the conventional design.

scholarly journals Digitally-Compensated Wideband 60 GHz Test-Bed for Power Amplifier Predistortion Experiments

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1473
Author(s):  
Martin Pospíšil ◽  
Roman Maršálek ◽  
Tomáš Götthans ◽  
Tomáš Urbanec
Keyword(s):  
Millimeter Wave ◽  
Power Amplifier ◽  
Communication Systems ◽  
High Speed ◽  
Direct Conversion ◽  
Digital Predistortion ◽  
60 Ghz ◽  
Test Bed ◽  
Front End ◽  
Predistortion Linearization

Millimeter waves will play an important role in communication systems in the near future. On the one hand, the bandwidths available at millimeter-wave frequencies allow for elevated data rates, but on the other hand, the wide bandwidth accentuates the effects of wireless front-end impairments on transmitted waveforms and makes their compensation more difficult. Research into front-end impairment compensation in millimeter-wave frequency bands is currently being carried out, mainly using expensive laboratory setups consisting of universal signal generators, spectral analyzers and high-speed oscilloscopes. This paper presents a detailed description of an in-house built MATLAB-controlled 60 GHz measurement test-bed developed using relatively inexpensive hardware components that are available on the market and equipped with digital compensation for the most critical front-end impairments, including the digital predistortion of the power amplifier. It also demonstrates the potential of digital predistortion linearization on two distinct 60 GHz power amplifiers: one integrated in a direct-conversion transceiver and an external one with 24 dBm output power.

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