Abstract: The present invention relates to a dual-mode dual-ring band-pass filter, which includes a first half-ring resonator, a second half-ring resonator, and a third half-ring resonator. The second half-ring resonator is located inside the opening of the first half-ring resonator. Both ends of the second half-ring resonator connect to both ends of the first half-ring resonator, respectively. Both ends of the third half-ring resonator connect to the both ends where the first half-ring resonator connects with the second half-ring resonator, respectively. In addition, the opening of the third half-ring resonator faces the opening of the second half-ring resonator.

Abstract: A two-tier canopy system is provided that includes a canopy support structure having a central post and a plurality of radially extending arms. A first canopy covering is supported by the radially extending arms and has a central opening, wherein the central post extends through the central opening. A second canopy covering, having at least a portion thereof disposed above the central opening, is supported by the central post, wherein the central post is biased towards the second canopy covering.

Abstract: A foldable hammock includes two bottom frames, and two side frames. Each of the bottom frames includes a fixed tube and two retractable tubes each retractably mounted on the fixed tube. Each of the two side frames includes two connected upright rods, two protruding sockets, and a hanging hook. Thus, the foldable hammock is available for a canopy, a soft bed, a swing chair, a foldable chair or the like, thereby enhancing the versatility of the foldable hammock to facilitate a user operating the foldable hammock.

Abstract: A canopy frame has a canopy connector and two connecting plates. The canopy connector has two chambers and two slant bottom blocks. Each of the chambers receives an end portion of the corresponding connecting plate. A rivet fastens the end portion of the connecting plate and the corresponding canopy connector pivotally.

Abstract: A foldable chair assembly includes a foldable frame, and a positioning unit. The foldable frame includes two auxiliary bars pivotally connected with each other. The positioning unit includes a first control lever having a first end pivotally mounted on one of the two auxiliary bars and a second end formed with a positioning channel, and a second control lever having a first end pivotally mounted on the other auxiliary bar and a second end detachably mounted in the positioning channel of the first control lever. Thus, the foldable frame is folded by pressing the second cover, so that the foldable frame can be folded by his one hand only, thereby facilitating the user folding the foldable frame.

Abstract: A portable bed includes a main part and support members. The main part consists of two pairs of parallel rods for supporting a cloth. The support members are connected to the main part and provide support therefore. The support members each have pivotally connected leg elements so that they can be moved to cross-legged, in use position to support the main part. The support members are each provided with strengthening elements to stand more stably. The strengthening elements each include a strengthening rod, a limiting member, and a slide. One end of the strengthening rod is pivoted to a corresponding limiting member, which is affixed to a corresponding leg element. An opposing end of the strengthening rod is pivoted to a corresponding slide capable of sliding along the other leg element.

Abstract: A folding chair has a seat, a first leg, a second leg, a first rod connected to the first leg and the second leg, a second rod connected to the first leg and the second leg, and a folding device. The folding device has a first joint and a second joint. The first joint has a guide channel, a circular aperture, and a slant round hole for receiving the first rod. The second joint has a post inserted in the guide channel, a hollow protruded block inserted in the circular aperture of the first joint, a round through aperture, and a slant circular hole for receiving the second rod. A bolt passes through the round through aperture of the second joint and the circular aperture of the first joint. A nut engages with the bolt.

Abstract: A folding chair has a seat, a first leg, a second leg, a first rod connected to the first leg and the second leg, a second rod connected to the first leg and the second leg, and a folding device. The folding device has a first joint and a second joint. The first joint has a guide channel, a circular aperture, and a slant round hole for receiving the first rod. The second joint has a post inserted in the guide channel, a hollow protruded block inserted in the circular aperture of the first joint, a round through aperture, and a slant circular hole for receiving the second rod. A bolt passes through the round through aperture of the second joint and the circular aperture of the first joint. A nut engages with the bolt.

Abstract: An easy chair device has a leg frame, and a chair main body disposed on the leg frame. Two backrest support rods and two armrest support rods extend upward from the leg frame. The chair main body has a backrest, a seat, and two armrests. The armrests are supported by the armrest support rods and the backrest support rods. A back band is disposed on a back of the backrest. Two fasteners are disposed on two ends of the back band. Two fastening bands are disposed on the armrests to engage with the back band.

Abstract: A hammock assembly has a bed net, and a foldable support frame. The bed net has two opposite hoop devices. The foldable support frame has a pair of base rods, a pair of left lifting rods, a pair of right lifting rods, two pairs of connectors, two pairs of connection rods, a pair of connection bars, and a pair of hook devices. One pair of connectors fasten the base rods and the right lifting rods together. The other pair of connectors fasten the base rods and the left lifting rods together. One hook device is connected to the right lifting rods. The other hook device is connected to the left lifting rods. One connection bar is disposed on one right lifting rod and connected to the other right lifting rod. The other connection bar is disposed on one left lifting rod and connected to the other left lifting rod. One pair of connection rods are disposed on the corresponding base rods and connected to the corresponding right lifting rods.

Abstract: A foldable chair assembly includes front and rear leg rods, sleeve members sleeved slidably and respectively on the leg rods, a fabric seat connected to the sleeve members, a fabric backrest connected to the rear leg rods, and four foldable cross-frames connected pivotally to the leg rods and the sleeve members. Each of a pair of armrest rods is connected pivotally to one of the front leg rods at one end, and is connected movably to one of the rear leg rods at the other end.