The technology hardware and equipment sector has been lifted by a jump in the share price of ARM and Imagination Technologies, which both provide chips used in smartphones such as Apple's iPhone.Speculation of an Apple bid for ARM is doing the rounds.The top performer in the sector though is tiddler Sarantel, which makes high-performance antennas for mobile phones and other wireless gadgets and today announced that it has won orders to supply antennas for Inmarsat's satellite phone the IsatPhone Pro.On a mixed day for retailers, the sector is lower overall.Car parts and bicycle retailer Halfords pedals ahead after saying it is confident of future earnings growth despite the uncertain economic outlook after posting a sharp rise in profits and revenues in the year to April 2.But FTSE-100 listed Home Retail Group is lower after it reported a decline in like-for-like sales at both its Argos and Homebase stores in the 13 weeks to 29 May.Top performing sectors so far todayTechnology Hardware & Equipment 446.96 +2.43%Automobiles & Parts 2,864.13 +0.91%Alternative Energy 5,772.09 +0.81%General Industrials 2,384.23 +0.72%Industrial Transportation 2,177.86 +0.66%Bottom performing sectors so far todayOil & Gas Producers 6,655.90 -2.36%Food & Drug Retailers 4,508.00 -1.15%Construction & Materials 3,183.69 -0.88%General Retailers 1,541.43 -0.83%Equity Investment Instruments 5,066.76 -0.78%