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PIM Suppression Technology for Microwave Components
Published in Wanzhao Cui, Jun Li, Wei Huan, Xiang Chen, Passive Intermodulation, 2022
Tiancun Hu, He Bai, Qi Wang, Lu Tian
Using waveguide diplexer, signals of different frequency bands can be transmitted and received by the same antenna. Based on this method, radar and communication technology can share a common antenna, thus reducing costs and improving reliability. It has a more prominent role in improving antijamming capabilities and high security requirements. Therefore, waveguide diplexer has a wide range of engineering applications, which can be used in microwave relay communication, satellite communication, microwave measurement and other fields.
Microwave Transmission
Published in Stephen Horan, Introduction to PCM Telemetering Systems, 2017
The diplexer is similar to the directional flow characteristics of the circulator (duplexer). The diplexer is a special filter that permits the antenna to be connected to the transmitter and receiver that are operating at different frequencies. In many applications, the transmitter and receiver are on different frequencies in the same general band and the diplexer lets both devices use the same antenna. Figure 11.9 illustrates this use of the diplexer.
Scanning the Issue
Published in IETE Journal of Research, 2023
Ranjan K Mallik, Shiban K Koul, Arun Kumar
In order to meet the needs of Long-Term Evolution (LTE) applications, this paper on “A Compact Diplexer Using Coupled π-CRLH Zeroth Resonators” presents a novel diplexer configuration that makes use of a newly-coupled composite right/left-handed (CRLH) resonator. Using connected zeroth order -CRLH resonators allows for a significant reduction in the diplexer's footprint because they have zero electrical length. The filters are designed to achieve a desired frequency bandwidth of 4% ∼16.7 Q-factor and ∼0.066 coupling coefficient at a center frequency of 2.1 and 2.6 GHz with transmission zeros. Diplexer rejection is 15–20 dB, with 1 dB of insertion loss maintained for both the transmit and receive bands. Equivalent circuit simulations, full electromagnetic simulations, and experimental measurements are used to validate circuit design assumptions. The observed and simulated results are highly consistent, with a small size of 30x 60 mm 2.
A compact wideband diplexer using stub-loaded square ring resonators
Published in Electromagnetics, 2021
Ping Zhang, Min-Hang Weng, Ru-Yuan Yang
With the rapid development of information technology, microwave communications have been widely used in military and civilian applications. The current system includes radio transmission, mobile phone, satellite communication system, ultra-wideband wireless communication, 4G communication system, and recently developed 5G communication system. The diplexer is a key component of the communication system and is a selective component used to combine or separate signals with different center frequencies (Chinig 2018). Namely, the diplexer can not only filter the signal but also separate and synthesize the signals of the two frequency bands, thus making the two channels not interfere with each other at the same time. Typically, the diplexer consists of two channel filters and a common input. The common input is used to combine the two channel filters to form a three-port circuit. The three ports of the diplexer are an antenna port, a transmit port, and a receive port. In a diplexer, one of the filters is connected to the transmitter and the other is connected to the receiver. With a diplexer, the antenna can be shared by both the transmitter and the receiver, but the transmitter and receiver operate in different frequency bands, and the interaction (or isolation) between the transmitted and received signals be as small as possible (Hong 2011).
High-isolation diplexing power divider with high-frequency selectivity
Published in Electromagnetics, 2020
Yuchen Yan, Kaijun Song, Yuxuan Chen
In modern wireless communication systems, diplexer is an essential device used to transfer different band signals to the corresponding channels (An et al. 2008; Chen et al. 2015; Chi and Yang 2016; Chuang and Wu 2011; Guan et al. 2014; Liu et al. 2013; Song et al. 2019a, 2019b; Xiao, Zhang, and Ma 2018; Xu 2016; Xu and Zhu 2017). In the past few years, various diplexers have been presented by using different miniaturized resonators, such as common T-shaped resonator (Chuang and Wu 2011), defected ground resonator (Song et al. 2019b), multimode stub-loaded resonators (Guan et al. 2014; Song et al. 2019a), slotline-loaded ring resonator (Chen et al. 2015), separated electric and magnetic coupling (SEMC) resonators (Xiao, Zhang, and Ma 2018), and so on. As a key passive component in the microwave millimeter-wave system, the power divider plays an important role in phased array radars, various types of transceivers, and active power combining circuits (Bialkowski and Abbosh 2017; Li et al. 2015; Song et al. 2017, 2013; Song and Xue 2010; Xiao et al. 2017; Yang et al. 2019; Zhu et al. 2018). Microstrip-line power divider is widely used in various power-dividing circuits due to its simple design, low transmission loss, and high isolation performance.