Transversal directional filters for channel combining

Hunter, I.C.; Musonda, Evaristo; Parry, R.; Guess, Michael; Meng, Meng

doi:10.1109/mwsym.2013.6697427

Cited by 9 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A matched duplexer is usually implemented by means of two identical filters connected through two 90 hybrids [9]. Recently, these devices have been proposed for realizing reconfigurable combiners, and some works have illustrated design approaches based on synthesis techniques [10], [11]. The design approach described here allows the realization of matched duplexers that do not need hybrids.…”

Section: Polynomial Modeling Of the Three-port Networkmentioning

confidence: 99%

“…Note that the highest degree coefficients of the reflection and transmission polynomials coming from the synthesized filter represent the coefficients and . With this assignment, the transmission parameters of the duplexer ( and ) become equal (in magnitude) to the transmission and reflection of the two-port filter (11) The isolation and the output ports matching result, (12) Note that isolation between ports 2 and 3 is assured by the zeros on imaginary axis in and . The output ports matching is also somehow enhanced by the multiple zeroes of and , respectively.…”

Section: Polynomial Modeling Of the Three-port Networkmentioning

confidence: 99%

“…The most common way to realize today this kind of duplexer is, however, based on a directional structure, which is composed by two identical filters connected through two 90 hybrids [9]. Some recent works have proposed a design approach that incorporate the hybrids into the coupled resonators structure [10], [11]. Here, we present another approach to the design of this kind of duplexer, based on polynomial modeling of a three-port network composed of coupled resonators (transformed into a low-pass normalized frequency domain [12]).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Duplexers With the Common Port Matched at All Frequencies

Tamiazzo¹,

Macchiarella

2014

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

I. INTRODUCTIOND UPLEXERS are three-port selective networks, mainly used for connecting a single antenna to the transceiver of a communication system (with the receiving and transmitting bands more or less close together). They are typically constituted by two filters, whose inputs are connected to the first port (referred to as the antenna port) through a suitable three-port network (referred as the junction); the outputs of the filters are the other two ports of the duplexer (TX port and RX port). In the simplest type of duplexer, the junction is realized by means of a nonreciprocal three-port (circulator); in this way the interaction between the two filters is removed and the design of the duplexer reduces to that of two filters taken separately. This solution, however, is not always possible or convenient, for several reasons (cost, additional unwanted effects, etc.), so several approaches to the design of duplexers employing a reciprocal three-port junction have been developedAnyhow, all of them assume the classical topology of the duplexer recalled above, i.e., two filters connected through a three-port reciprocal junction. Recently, some works have

show abstract

Section: Polynomial Modeling Of the Three-port Networkmentioning

confidence: 99%

Section: Polynomial Modeling Of the Three-port Networkmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Duplexers With the Common Port Matched at All Frequencies

Tamiazzo¹,

Macchiarella

2014

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Two-port filters with high attenuation have also been developed and use multipath cancellation, reflection, or absorption to achieve infinite rejection [16][17][18][19][20][21][22][23]. Applications include transmit/receive modules, multiplexers in ultra-wide-band antennas, and superheterodyne receivers [24][25][26][27][28]. Apart from rare examples [29], development has involved systems with real impedance.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Magnetoinductive Directional Filters

2022

View full text Add to dashboard Cite

Multiport magnetoinductive (MI) devices with directional filter properties are presented. Design equations are developed and solved using wave analysis and dispersion theory, and it is shown that high-performance directional filters can be realised for use both in MI systems with complex, frequency-dependent impedance and in conventional systems with real impedance. Wave analysis is used to reduce the complexity of circuit equations. High-performance MI structures combining directional and infinite rejection filtering are demonstrated, as well as multiple-passband high-rejection filtering. A new method for improving filtering performance through multipath loss compensation is described. Methods for constructing tuneable devices using toroidal ferrite-cored transformers are proposed and demonstrated, and experimental results for tuneable MI directional filters are shown to agree with theoretical models. Limitations are explored, and power handling sufficient for HF RFID applications is demonstrated, despite the use of ferrite materials.

show abstract