Design and fabrication of a low-loss microstrip lowpass-bandpass diplexer for WiMAX applications

Nouri, Leila; Yahya, Salah I.; Rezaei, Abbas

doi:10.23919/jcc.2020.06.009

Cited by 18 publications

(21 citation statements)

References 7 publications

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“…On the other hand, the diplexers in [2] and [3] have lower performance in terms of circuit size and isolation level. Although the diplexers in [7,8,13,14] have more compact circuit size, isolation levels are not as good as the proposed work.…”

Section: Experimental Studiesmentioning

confidence: 75%

“…In addition, novel lowpass filter sections have been introduced in [6-8, 13, 14] for lowpassbandpass diplexer design. However, single transmission pole is observed in the bandpass channel in [6], and isolation levels are not good enough in [7,8,13,14]. Besides, lowpass-bandpass triplexers [9,10] and a quintuplexer [9] have also been reported based on distributed coupling technique [9] and defected ground structures [10].…”

Section: Introductionmentioning

confidence: 99%

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Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

Elden¹,

Görür²

2021

PIER Letters

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In this paper, a novel compact lowpass-bandpass microstrip diplexer with high isolation is proposed. The proposed structure consists of a lowpass filter section and a bandpass filter section. The lowpass filter section is designed at a cutoff frequency of 2 GHz with sixth order elliptic filtering characteristics. The bandpass filter section is designed at 3.5 GHz by using a meandered dual-mode loop resonator (MDMLR). The MDMLR is coupled to input port by open circuited feeding lines. The lowpass-bandpass diplexer is formed by combining lowpass and bandpass filter sections without using an additional matching circuit. The designed lowpass-bandpass diplexer has been fabricated and measured in a very good agreement with the simulated results. Isolation between the output ports has been measured as better than 40 dB.

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Section: Experimental Studiesmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

Elden¹,

Görür²

2021

PIER Letters

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“…M odern wireless communication systems widely need to microstrip passive devices such as filters, [1][2][3][4][5][6] diplexers, [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] multiplexers (triplexers [23][24][25][26][27][28][29][30] and quadruplexers, [31][32][33][34][35][36][37] five-channel multiplexer [38] ), and couplers. [39][40][41][42][43][44][45][46][47][48][49] For all of these passive devices, it is very necessary to have small dimensions, low insertion loss (IL), low return loss (RL), suppressed undesired harmonics, sharp roll-off at the edge of passbands (high frequency selectivity), etc.…”

Section: Introductionmentioning

confidence: 99%

“…Several types of microstrip diplexers such as twochannel, multi-channel, bandpass-bandpass, and lowpassbandpass are presented in. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] They have three ports, called; port1, port2 and port3, which pass the desired signal through two different frequency channels. The channels are created among port1-port2 and port1-port3, so port1 is common.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Structure, Application and Performance of the Passive Microstrip Devices

Rezaei

Yahya

2022

Cihan U Erbil SCI J

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Microstrip technology is widely applied for design and implementation of several communication devices such as filters, diplexers, triplexers, multiplexers, couplers, etc. They are utilized to isolate desired signals and remove disturbing signals. The layout of filters, diplexers and triplexers have two, three and four ports, respectively. Passive filters have at least one pass channel, whereas diplexers have at least two channels to transmit the desired signal, and multiplexers have more passbands with more channels. In order to implement the passive components, first a cell called resonator must be designed. Creativity is very important in resonator design. It must be small and novel to get a better device than previous works. Therefore, the layout of previous reported resonator, used in passive microstrip devices, are studied in this work. There is a fierce competition among designers to miniaturize and increase the device performance. Hence we will investigate them, from the point of view size and performance, in this work. Some diplexers are multi-channel, which are more difficult to design than two-channel diplexers. Therefore, the multi-channel diplexers are less reported than the two-channel diplexers. The design of multiplexers is also very difficult because several channels must be controlled. Hence, they are less designed than filters and diplexers. The diplexers can be bandpass-bandpass or lowpass-bandpass, where the latest is less designed. This is because designing a lowpass-bandpass diplexer needs lowpass and bandpass resonators, whereas the design of a bandpass-bandpass diplexer needs only a bandpass resonator.

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“…As a key component of RF front end, the diplexer is essential in the multi-frequency transceiver [1]. Since a diplexer can simultaneously deal with the uplink and downlink signals, the number of filters can be reduced by half [2]. Due to the aforementioned advantages, various diplexers have been reported.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced-/Balanced-to-Unbalanced Diplexer Based on Dual-Mode Dielectric Resonator

Chen

2021

IEEE Access

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The design of compact unbalanced-/balanced-to-unbalanced diplexer (U2U/B2U) based on full dual-mode dielectric resonator (DR) is investigated for the first time. The relationships of the external quality factors (Q e ) under the two modes are analyzed. It is found that the Q e of two modes can be controlled independently, which makes the design procedure simple and efficient. Based on the analysis, both of the proposed U2U and B2U diplexer can be easily built by properly adding feeding probes for the DR without increasing the circuit size by altering the location of the feeding probes according to the distribution of the electromagnetic fields. To verify the proposed design concept, the diplexers mentioned above are simulated, implemented and measured. The isolation is achieved by the orthogonality between modes while the low insertion loss is obtained due to the high unloaded quality factor (Q u ) of the dual-mode DR. The measurements are in accordance with the simulated results, showing low loss and good selectivity.INDEX TERMS Miniaturization, dual-mode dielectric resonator (DR), diplexer, design approach, unbalanced-to-unbalanced (U2U), balanced-to-unbalanced (B2U).

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Design and fabrication of a low-loss microstrip lowpass-bandpass diplexer for WiMAX applications

Cited by 18 publications

References 7 publications

Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

Design of a Compact Lowpass-Bandpass Diplexer With High Isolation

A Review on the Structure, Application and Performance of the Passive Microstrip Devices

Unbalanced-/Balanced-to-Unbalanced Diplexer Based on Dual-Mode Dielectric Resonator

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