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This article proposes a novel approach for extracted pole (EP) filter synthesis. The pole producing elements can be extracted without introducing phase shifters. It is made possible by extracting lowpass elements in the prototype without reducing the order of filter functions. Using the proposed elements as added redundancy, the nonideal effect in the physical model is absorbed by adjacent resonators. Those novel approaches break through the conventional framework in EP filter synthesis. The synthesized results do not introduce extra spikes caused by nonideal phase shifters in the conventional EP filters. The new theory enables the application of EP filters in broadband situations. This work also reveals the equivalence between the frequency-dependent couplings and the PPEs. The validity of the demonstrated method is illustrated via an 11-pole filter with two transmission zeros. The simulated and measured results have no extra spikes caused by the nonideal phase shifters, which verified the effectivity of the proposed theory. [ABSTRACT FROM AUTHOR]

This article presents a fully integrated 12-channel multiplexer with TE011 mode channel filters enabled by the unified extracted pole technique. A novel synthesis procedure is proposed to remove the limitation (a very small coupling) in the prototype with the classical approach. In addition, this article proposes a novel approach to assign the junction susceptance by simply shifting the length of the connecting waveguide section of the dangling resonators. The design process is then extended to the singly terminated case as the channel filter design. This work also proposes a novel analytical approach to derive the initial connecting phase lengths for the manifold multiplexer design. The circuit level optimization and space-mapping procedure for deriving physical dimensions are illustrated. The multiplexer is designed and constructed using a new clamshell structure, which offers low cost, small footprint, easy fabrication, and superior thermal performance. The simulated and measured results demonstrated that the proposed theory offers an excellent solution to the high-power waveguide manifold multiplexer designs. [ABSTRACT FROM AUTHOR]

This article studied the interference between two channels of a tunable diplexer and proposed a feasible solution to alleviate the effect. A novel approach to synthesize the channel filter with the first element replicating the other channel’s effect is first developed. It led a set of simple formulae for fixed frequency diplexer design. After that, a framework incorporating a redundant coupling path to generate cancellation effect is derived using the coupling matrix theory. The proposed theories are demonstrated and verified using a combline diplexer design. The simulated and measured results suggest that the interference of the two channels can be greatly mitigated. [ABSTRACT FROM AUTHOR]

This contribution establishes the relationship between the complementary condition and the singly terminated (ST) networks. The general theory is first presented in the form of bandpass/bandstop complementary diplexers. Furthermore, the well-known limitation of a complementary diplexer, i.e., using maximally flat prototypes, is overcome. From the first principle, it is rigorously proven that predefined complementary features can be obtained by connecting two channel filters in an ST prototype of the same filter function but exchanging the transfer and reflection part. This paper leads to a general design procedure for bandpass and bandstop complementary diplexers using arbitrary functions. A complementary diplexer design example with full electromagnetic simulated results and measured results verified the accuracy of the proposed theory. Finally, the theory is further extended to N-ports networks. A new “partially-complementary” condition is proposed. The new theory leads to an extremely simple and “direct approach” to estimate the performance of contiguous multiplexers without any optimization. [ABSTRACT FROM AUTHOR]

This paper proposes a novel and unified synthesis approach and design procedure for microwave filters with extracted pole and nonresonating node (NRN) technique. By introducing a general circuit topology, the traditional extracted pole and NRN filters can be unified to a general prototype. With the new design process, the exact mapping relationship between the electromagnetic (EM) model of the pole producing element and the circuit model can be achieved. All the physical dimensions of the filter structure can be obtained by a fully analytical approach. No full EM optimization or adjustment is needed in the filter design. A three pole TE \mathrm { {101}} mode waveguide filter with one finite transmission zero is designed to illustrate the new procedure. In addition, a seven-pole TE \mathrm { {011}} mode filter with four finite transmission zeros covering all three possible types of arrangements is designed and fabricated to demonstrate the versatility of the proposed method. The simulated and measured results verified the efficiency and the accuracy of the proposed design method. [ABSTRACT FROM AUTHOR]

This article offers a novel approach to realize dual-polarized diplexers (DPDIPs), which can duplex horizontally and vertically polarized signals separately. The proposed device is composed of a turnstile junction (TJ) and four-channel filters. Compared with conventional orthomode transducer (OMT) and two diplexers scheme, it has an ultracompact size and comparable performance. A new arrangement for the TJ that is suitable for the DPDIP is analyzed and simulated accordingly. A Ka-band DPDIP is designed and fabricated as a verification example. Simulated and measured results have verified the accuracy and efficiency of the proposed method. [ABSTRACT FROM AUTHOR]