Greater Than the Sum of Its Parts

Electromagnetic Radiation From Unbalanced Transmission Lines

“…The subject of this paper is the understanding of the mechanism that leads to radiation and nonlinear propagation characteristics in unbalanced transmission lines. Radiation from unbalanced structures is of great interest to the scientific community [5] and this paper furthers the understanding of this phenomenon. We will show that what is referred to as "common-mode current" in the literature is in fact convection current that arises in transmission lines with unequal conductor resistances.…”

High-selectivity balanced-filter circuits based on coupled lines with open/shorted loaded stubs

“…Balanced circuits, such as balanced filters -balanced power dividing and combining networks with the advantages of less susceptibility to environmental noise, a better dynamic range, and lower electromagnetic interference (EMI) -are of vital importance in today's communication systems. [1,2] For RF and microwave applications, when sinusoidal signals are transmitted in balanced circuits, direct current (DC) and low-frequency terms are not allowed to pass through for differential mode, and an all-stop or bandstop response should be realised for the common mode. In the past few years, many microstrip balanced filters for single band, dual-band and wideband with common mode suppression have been realised; [3][4][5][6][7][8][9][10][11][12][13][14][15] in addition, different balanced diplexers, in-phase and out-of-phase balanced networks with high performance have also been illustrated in [16][17][18][19][20].…”

“…to(4), choose the desired centre frequency f 0 of the balanced bandpass filter and the 3-dB bandwidth of the parallelcoupled line, determine the width w of the parallel-coupled line and gap g as well as the locations of the transmission zeros f tz1 and f tz2 ;(2) Adjust the open/shorted loaded stubs characteristic impedance Z 1 to realise a fifth-order passband for the differential mode, choose the desired bandwidth for the differential mode (less than 20%, |S dd11 | > 15 dB) and the level of common mode suppression (|S cc21 | > 25 dB, 0-3f 0 );(3)When Z oe and Z oo are determined, further optimise the values of Z 1 to realise better in-band Downloaded by [University of Sussex Library] at 03:45 07 June 2016 Simulated frequency responses of Figure 8(b) for: (a) |S dd21 | and |S dd11 | (Z 1 = 40 /100 , Z oe = 160 , Z oo = 110 ); (b) |S dd21 | and |S dd11 | versus Z 1 (Z oe = 160 , Z oo = 110 ); and (c) |S dd21 | versus Z oe , Z oo (Z 1 = 100 ).…”

Design and implementation of two different RF SiPs for micro base station

“…Quite a part of RF chips are difficult to implementation by using the silicon process. Heterogeneous integration in SoC is still difficult due to process and size constraints [2][3][4]. While RF SiP integration platform can overcome many of the impediments of SoC at the expense of larger form factor and heterogeneous integration.…”